i
BIDDING DOCUMENT
for
Procurement of
Power Transformers for Primary
Substation 132/33kV, 66/11kV,
33/11kV
ICB No: KP1/6E/2/A23
KENYA ENERGY SECTOR RECOVERY PROJECT
MAY 2012
iii
Summary
PART 1 – BIDDING PROCEDURES
Section I.
Instructions to Bidders (ITB)
This Section provides information to help Bidders prepare their bids.
Information is also provided on the submission, opening, and evaluation of
bids and on the award of Contracts. Section I contains provisions that are to
be used without modification.
Section II.
Bidding Data Sheet (BDS)
This Section includes provisions that are specific to each procurement and that
supplement Section I, Instructions to Bidders.
Section III.
Evaluation and Qualification Criteria
This Section specifies the criteria to be used to determine the lowest evaluated
bid, and the Bidder’s qualification requirements to perform the contract.
Section IV.
Bidding Forms
This Section includes the forms for the Bid Submission, Price Schedules, Bid
Security, and the Manufacturer’s Authorization to be submitted with the Bid.
Section V.
Eligible Countries
This Section contains information regarding eligible countries.
PART 2 – SUPPLY REQUIREMENTS
Section VI.
Schedule of Requirements
This Section includes the List of Goods and Related Services, the Delivery
and Completion Schedules, the Technical Specifications and the Drawings
that describe the Goods and Related Services to be procured.
PART 3 – CONTRACT
Section VII. General Conditions of Contract (GCC)
This Section includes the general clauses to be applied in all contracts. The
text of the clauses in this Section shall not be modified.
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Section VIII.
Summary Description
Special Conditions of Contract (SCC)
This Section includes clauses specific to each contract that modify or
supplement Section VII, General Conditions of Contract.
Section IX:
Contract Forms
This Section includes the form for the Agreement, which, once completed,
incorporates corrections or modifications to the accepted bid that are
permitted under the Instructions to Bidders, the General Conditions of
Contract, and the Special Conditions of Contract.
The forms for Performance Security and Advance Payment Security, when
required, shall only be completed by the successful Bidder after contract
award.
Attachment: Invitation for Bids
An “Invitation for Bids” form is provided at the end of the Bidding
Documents for information.
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Table of Contents
PART 1 – Bidding Procedures ............................................................................................... 1
Section I. Instructions to Bidders ..............................................................................................3
Section II. Bidding Data Sheet (BDS) ....................................................................................29
Section III. Evaluation and Qualification Criteria ..................................................................35
Section IV. Bidding Forms .....................................................................................................39
Section V. Eligible Countries .................................................................................................51
PART 2 – Supply Requirements .......................................................................................... 53
Section VI. Schedule of Requirements ...................................................................................54
TECHNICAL SPECIFICATION FOR POWER TRANSFORMERS ............................. 3
PART 3 - Contract .............................................................................................................. 112
Section VII. General Conditions of Contract ........................................................................113
Section VIII. Special Conditions of Contract .......................................................................133
Section IX. Contract Forms ..................................................................................................139
Invitation for Bids (IFB) ........................................................................................................145
1
PART 1 – Bidding Procedures
3
Section I. Instructions to Bidders
Table of Clauses
General ..................................................................................................................................... 5
Scope of Bid ...............................................................................................................................5
Source of Funds .........................................................................................................................5
Fraud and Corruption .................................................................................................................5
Eligible Bidders .........................................................................................................................7
Eligible Goods and Related Services .........................................................................................8
Contents of Bidding Documents ............................................................................................ 9
Sections of Bidding Documents.................................................................................................9
Clarification of Bidding Documents ........................................................................................10
Amendment of Bidding Documents ........................................................................................10
Preparation of Bids ............................................................................................................... 10
Cost of Bidding ........................................................................................................................10
Language of Bid .......................................................................................................................10
Documents Comprising the Bid ...............................................................................................10
Bid Submission Form and Price Schedules .............................................................................11
Alternative Bids .......................................................................................................................11
Bid Prices and Discounts .........................................................................................................11
Currencies of Bid .....................................................................................................................14
Documents Establishing the Eligibility of the Bidder .............................................................14
Documents Establishing the Eligibility of the Goods and Related Services ...........................14
Documents Establishing the Conformity of the Goods and Related Services .........................14
Documents Establishing the Qualifications of the Bidder .......................................................15
Period of Validity of Bids ........................................................................................................16
Bid Security .............................................................................................................................16
Format and Signing of Bid .......................................................................................................18
Submission and Opening of Bids ......................................................................................... 18
Submission, Sealing and Marking of Bids ...............................................................................18
Deadline for Submission of Bids .............................................................................................19
Late Bids ..................................................................................................................................19
Withdrawal, Substitution, and Modification of Bids ...............................................................19
Bid Opening .............................................................................................................................19
Evaluation and Comparison of Bids ................................................................................... 20
Confidentiality .........................................................................................................................21
Clarification of Bids .................................................................................................................21
4
Section I Instructions to Bidders
Responsiveness of Bids............................................................................................................21
Nonconformities, Errors, and Omissions .................................................................................22
Preliminary Examination of Bids.............................................................................................22
Examination of Terms and Conditions; Technical Evaluation ................................................23
Conversion to Single Currency ................................................................................................23
Domestic Preference ................................................................................................................23
Evaluation of Bids....................................................................................................................23
Comparison of Bids .................................................................................................................24
Postqualification of the Bidder ................................................................................................24
Purchaser’s Right to Accept Any Bid, and to Reject Any or All Bids ....................................25
Award of Contract ................................................................................................................ 25
Award Criteria .........................................................................................................................25
Purchaser’s Right to Vary Quantities at Time of Award .........................................................25
Notification of Award ..............................................................................................................25
Signing of Contract ..................................................................................................................26
Performance Security ...............................................................................................................26
Section I Instructions to Bidders
5
Section I. Instructions to Bidders
General
Scope of Bid
Source of Funds
Fraud and
Corruption
1.1
The Purchaser indicated in the Bidding Data Sheet (BDS),
issues these Bidding Documents for the supply of Goods and
Related Services incidental thereto as specified in Section VI,
Schedule of Requirements. The name and identification number
of this International Competitive Bidding (ICB) procurement are
specified in the BDS. The name, identification, and number of
lots of are provided in the BDS.
1.2
Throughout these Bidding Documents:
(a)
the term “in writing” means communicated in written form
(e.g. by mail, e-mail, fax, telex) with proof of receipt;
(b)
if the context so requires, “singular” means “plural” and
vice versa; and
(c)
“day” means calendar day.
2.1
The Borrower or Recipient (hereinafter called “Borrower”)
specified in the BDS has applied for or received financing
(hereinafter called “funds”) from the International Bank for
Reconstruction and Development or the International
Development Association (hereinafter called “the Bank”) toward
the cost of the project named in the BDS. The Borrower intends
to apply a portion of the funds to eligible payments under the
contract for which these Bidding Documents are issued.
2.2
Payments by the Bank will be made only at the request of the
Borrower and upon approval by the Bank in accordance with the
terms and conditions of the financing agreement between the
Borrower and the Bank (hereinafter called the Loan Agreement),
and will be subject in all respects to the terms and conditions of
that Loan Agreement. The Loan Agreement prohibits a
withdrawal from the loan account for the purpose of any
payment to persons or entities, or for any import of goods, if
such payment or import, to the knowledge of the Bank, is
prohibited by decision of the United Nations Security Council
taken under Chapter VII of the Charter of the United Nations. No
party other than the Borrower shall derive any rights from the
Loan Agreement or have any claim to the funds.
3.1
It is the Bank’s policy to require that Borrowers (including
beneficiaries of Bank loans), as well as bidders, suppliers, and
6
Section I Instructions to Bidders
contractors and their agents (whether declared or not), personnel,
subcontractors, sub-consultants, service providers and suppliers
under Bank-financed contracts, observe the highest standard of
ethics during the procurement and execution of such contracts.1
In pursuance of this policy, the Bank:
(a)
defines, for the purposes of this provision, the terms set
forth below as follows:
(i)
“corrupt practice” is the offering, giving, receiving or
soliciting, directly or indirectly, of anything of value
to influence improperly the actions of another party2;
(ii)
“fraudulent practice” is any act or omission, including
a misrepresentation, that knowingly or recklessly
misleads, or attempts to mislead, a party to obtain a
financial or other benefit or to avoid an obligation3;
(iii) “collusive practice” is an arrangement between two or
more parties4 designed to achieve an improper
purpose, including to influence improperly the actions
of another party;
(iv) “coercive practice” is impairing or harming, or
threatening to impair or harm, directly or indirectly,
any party or the property of the party to influence
improperly the actions of a party5;
(v)
“obstructive practice” is
(aa) deliberately destroying, falsifying, altering or
concealing of evidence material to the
investigation or making false statements to
investigators in order to materially impede a
Bank investigation into allegations of a corrupt,
fraudulent, coercive or collusive practice; and/or
threatening, harassing or intimidating any party
to prevent it from disclosing its knowledge of
matters relevant to the investigation or from
1
In this context, any action taken by a bidder, supplier, contractor, or any of its personnel, agents,
subcontractors, sub-consultants, service providers, suppliers and/or their employees to influence the
procurement process or contract execution for undue advantage is improper.
2
“Another party” refers to a public official acting in relation to the procurement process or contract execution.
In this context, “public official” includes World Bank staff and employees of other organizations taking or
reviewing procurement decisions.
3
“Party” refers to a public official; the terms “benefit” and “obligation” relate to the procurement process or
contract execution; and the “act or omission” is intended to influence the procurement process or contract
execution.
4
“Parties” refers to participants in the procurement process (including public officials) attempting to establish
bid prices at artificial, non- competitive levels.
5
“Party” refers to a participant in the procurement process or contract execution.
Section I Instructions to Bidders
7
pursuing the investigation; or
(bb) acts intended to materially impede the exercise
of the Bank’s inspection and audit rights
provided for under sub-clause 3.1 (e) below.
(b)
will reject a proposal for award if it determines that the
bidder recommended for award has, directly or through an
agent, engaged in corrupt, fraudulent, collusive, coercive or
obstructive practices in competing for the contract in
question;
(c)
will cancel the portion of the loan allocated to a contract if it
determines at any time that representatives of the Borrower
or of a beneficiary of the loan engaged in corrupt,
fraudulent, collusive, or coercive practices during the
procurement or the execution of that contract, without the
Borrower having taken timely and appropriate action
satisfactory to the Bank to address such practices when they
occur; and
(d)
will sanction a firm or an individual, at any time, in
accordance with prevailing Bank’s sanctions proceduresa,
including by publicly declaring such firm or individual
ineligible, either indefinitely or for a stated period of
time:(i) to be awarded a Bank-financed contract; and (ii) to
be a nominatedb subcontractor, consultant, manufacturer or
supplier, or service provider of an otherwise eligible firm
being awarded a Bank-financed contract.
3.2 In further pursuance of this policy, Bidders shall permit the Bank to
inspect any accounts and records and other documents relating to the
Bid submission and contract performance, and to have them audited by
auditors appointed by the Bank.
3.3 Furthermore, Bidders shall be aware of the provision stated in
Sub-Clause 35.1 (a) (iii) of the General Conditions of Contract.
Eligible Bidders
4.1
A Bidder, and all parties constituting the Bidder, may have the
nationality of any country, subject to the restrictions specified in
a
A firm or an individual may be declared ineligible to be awarded a Bank-financed contract upon completion of
the Bank’s sanctions proceedings as per its sanctions procedures, including inter alia: (i) temporary suspension
in connection with an ongoing sanctions proceeding; (ii) cross-debarment as agreed with other International
Financial Institutions, including Multilateral Development Banks; and (iii) the World Bank Group corporate
administrative procurement sanctions procedures for fraud and corruption.
b
A nominated sub-contractor, consultant, manufacturer or supplier, or service provider (different names are
used depending on the particular bidding document) is one which either has been: (i) included by the bidder in
its pre-qualification application or bid because it brings specific and critical experience and know-how that are
accounted for in the evaluation of the bidder’s pre-qualification application or the bid; or (ii) appointed by the
Borrower.
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Section I Instructions to Bidders
Section V, Eligible Countries. A Bidder shall be deemed to have
the nationality of a country if the Bidder is a citizen or is
constituted, incorporated, or registered and operates in
conformity with the provisions of the laws of that country. This
criterion shall also apply to the determination of the nationality
of proposed subcontractors or suppliers for any part of the
Contract including Related Services.
4.2
A Bidder shall not have a conflict of interest. All bidders found
to have conflict of interest shall be disqualified. Bidders may be
considered to have a conflict of interest with one or more parties
in this bidding process, if they:
(a)
are or have been associated in the past, with a firm or any
of its affiliates which have been engaged by the Purchaser
to provide consulting services for the preparation of the
design, specifications, and other documents to be used for
the procurement of the goods to be purchased under these
Bidding Documents ; or
(b)
submit more than one bid in this bidding process, except
for alternative offers permitted under ITB Clause 13.
However, this does not limit the participation of
subcontractors in more than one bid;
4.3-4.4 A firm that has been sanctioned by the Bank in accordance with
the above ITB Clause 3.1 (d), or in accordance with the Bank’s
Guidelines on Preventing and Combating Fraud and Corruption in
Projects Financed by IBRD Loans and IDA Credits and Grants,
shall be ineligible to be awarded a Bank-financed contract, or
benefit from a Bank-financed contract, financially or otherwise,
during such period of time as the Bank shall determine. The list of
debarred firms is available at the electronic address specified in
the BDS.
Eligible Goods and
Related
Services
4.5
Government-owned enterprises in the Borrower’s Country shall
be eligible only if they can establish that they (i) are legally and
financially autonomous, (ii) operate under commercial law, and
(iii) are not a dependent agency of the Purchaser.
4.6
Bidders shall provide such evidence of their continued
eligibility satisfactory to the Purchaser, as the Purchaser shall
reasonably request.
5.1
All the Goods and Related Services to be supplied under the
Contract and financed by the Bank may have their origin in any
country in accordance with Section V, Eligible Countries.
Section I Instructions to Bidders
9
5.2
For purposes of this Clause, the term “goods” includes
commodities, raw material, machinery, equipment, and industrial
plants; and “related services” includes services such as
insurance, installation, training, and initial maintenance.
5.3
The term “origin” means the country where the goods have been
mined, grown, cultivated, produced, manufactured or processed;
or, through manufacture, processing, or assembly, another
commercially recognized article results that differs substantially
in its basic characteristics from its components.
Contents of Bidding Documents
Sections of Bidding
Documents
6.1
The Bidding Documents consist of Parts 1, 2, and 3, which
include all the Sections indicated below, and should be read in
conjunction with any Addendum issued in accordance with ITB
Clause 8.
PART 1
Bidding Procedures

Section I. Instructions to Bidders (ITB)

Section II. Bidding Data Sheet (BDS)

Section III. Evaluation and Qualification Criteria

Section IV. Bidding Forms

Section V. Eligible Countries
PART 2 Supply Requirements

Section VI. Schedule of Requirements
PART 3 Contract

Section VII. General Conditions of Contract (GCC)

Section VIII. Special Conditions of Contract (SCC)

Section IX. Contract Forms
6.2
The Invitation for Bids issued by the Purchaser is not part of the
Bidding Documents.
6.3
The Purchaser is not responsible for the completeness of the
Bidding Documents and their addendum, if they were not
obtained directly from the Purchaser.
6.4
The Bidder is expected to examine all instructions, forms, terms,
and specifications in the Bidding Documents. Failure to furnish
10
Section I Instructions to Bidders
all information or documentation required by the Bidding
Documents may result in the rejection of the bid.
Clarification of
Bidding
Documents
7.1
A prospective Bidder requiring any clarification of the Bidding
Documents shall contact the Purchaser in writing at the
Purchaser’s address specified in the BDS. The Purchaser will
respond in writing to any request for clarification, provided that
such request is received no later than twenty-one (21) days prior
to the deadline for submission of bids. The Purchaser shall
forward copies of its response to all those who have acquired the
Bidding Documents directly from it, including a description of
the inquiry but without identifying its source. Should the
Purchaser deem it necessary to amend the Bidding Documents as
a result of a clarification, it shall do so following the procedure
under ITB Clause 8 and ITB Sub-Clause 24.2.
Amendment of
Bidding
Documents
8.1
At any time prior to the deadline for submission of bids, the
Purchaser may amend the Bidding Documents by issuing
addendum.
8.2
Any addendum issued shall be part of the Bidding Documents
and shall be communicated in writing to all who have obtained
the Bidding Documents directly from the Purchaser.
8.3
To give prospective Bidders reasonable time in which to take an
addendum into account in preparing their bids, the Purchaser
may, at its discretion, extend the deadline for the submission of
bids, pursuant to ITB Sub-Clause 24.2
Preparation of Bids
Cost of Bidding
9.1
The Bidder shall bear all costs associated with the preparation
and submission of its bid, and the Purchaser shall not be
responsible or liable for those costs, regardless of the conduct or
outcome of the bidding process.
Language of Bid
10.1 The Bid, as well as all correspondence and documents relating to
the bid exchanged by the Bidder and the Purchaser, shall be
written in the language specified in the BDS. Supporting
documents and printed literature that are part of the Bid may be
in another language provided they are accompanied by an
accurate translation of the relevant passages into the language
specified in the BDS, in which case, for purposes of
interpretation of the Bid, such translation shall govern.
Documents
Comprising the
Bid
11.1 The Bid shall comprise the following:
(a)
Bid Submission Form and the applicable Price Schedules,
Section I Instructions to Bidders
11
in accordance with ITB Clauses 12, 14, and 15;
Bid Submission
Form and Price
Schedules
(b)
Bid Security or Bid-Securing Declaration, in accordance
with ITB Clause 21, if required;
(c)
written confirmation authorizing the signatory of the Bid to
commit the Bidder, in accordance with ITB Clause 22;
(d)
documentary evidence in accordance with ITB Clause 16
establishing the Bidder’s eligibility to bid;
(e)
documentary evidence in accordance with ITB Clause 17,
that the Goods and Related Services to be supplied by the
Bidder are of eligible origin;
(f)
documentary evidence in accordance with ITB Clauses 18
and 30, that the Goods and Related Services conform to the
Bidding Documents;
(g)
documentary evidence in accordance with ITB Clause 19
establishing the Bidder’s qualifications to perform the
contract if its bid is accepted; and
(h)
any other document required in the BDS.
12.1 The Bidder shall submit the Bid Submission Form using the form
furnished in Section IV, Bidding Forms. This form must be
completed without any alterations to its format, and no
substitutes shall be accepted. All blank spaces shall be filled in
with the information requested.
12.2 The Bidder shall submit the Price Schedules for Goods and
Related Services, according to their origin as appropriate, using
the forms furnished in Section IV, Bidding Forms
Alternative Bids
13.1 Unless otherwise specified in the BDS, alternative bids shall not
be considered.
Bid Prices and
Discounts
14.1 The prices and discounts quoted by the Bidder in the Bid
Submission Form and in the Price Schedules shall conform to the
requirements specified below.
14.2 All lots and items must be listed and priced separately in the
Price Schedules.
14.3 The price to be quoted in the Bid Submission Form shall be the
total price of the bid, excluding any discounts offered.
14.4 The Bidder shall quote any unconditional discounts and indicate
the method for their application in the Bid Submission Form.
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Section I Instructions to Bidders
14.5 The terms EXW, CIP, and other similar terms shall be governed
by the rules prescribed in the current edition of Incoterms,
published by The International Chamber of Commerce, as
specified in the BDS.
14.6 Prices shall be quoted as specified in each Price Schedule
included in Section IV, Bidding Forms. The dis-aggregation of
price components is required solely for the purpose of facilitating
the comparison of bids by the Purchaser. This shall not in any
way limit the Purchaser’s right to contract on any of the terms
offered. In quoting prices, the Bidder shall be free to use
transportation through carriers registered in any eligible country,
in accordance with Section V Eligible Countries. Similarly, the
Bidder may obtain insurance services from any eligible country
in accordance with Section V Eligible Countries. Prices shall be
entered in the following manner:
(a)
(b)
For Goods manufactured in the Purchaser’s Country:
(i)
the price of the Goods quoted EXW (ex works, ex
factory, ex warehouse, ex showroom, or off-theshelf, as applicable), including all customs duties
and sales and other taxes already paid or payable on
the components and raw material used in the
manufacture or assembly of the Goods;
(ii)
any Purchaser’s Country sales tax and other taxes
which will be payable on the Goods if the contract is
awarded to the Bidder; and
(iii)
the price for inland transportation, insurance, and other
local services required to convey the Goods to their
final destination (Project Site) specified in the BDS.
For Goods manufactured outside the Purchaser’s
Country, to be imported:
(i)
the price of the Goods, quoted CIP named place of
destination, in the Purchaser’s Country, or CIF
named port of destination, as specified in the BDS;
(ii)
the price for inland transportation, insurance, and
other local services required to convey the Goods
from the named place of destination to their final
destination (Project Site) specified in the BDS;
(iii) in addition to the CIP prices specified in (b)(i)
above, the price of the Goods to be imported may
be quoted FCA (named place of destination) or
Section I Instructions to Bidders
13
CPT (named place of destination), if so specified
in the BDS;
(c)
For Goods manufactured outside the Purchaser’s
Country, already imported:
[For previously imported Goods, the quoted price shall be
distinguishable from the original import value of these Goods
declared to customs and shall include any rebate or mark-up of
the local agent or representative and all local costs except
import duties and taxes, which have been and/or have to be
paid by the Purchaser. For clarity the bidders are asked to
quote the price including import duties, and additionally to
provide the import duties and the price net of import duties
which is the difference of those values.]
(i)
the price of the Goods, including the original
import value of the Goods; plus any mark-up (or
rebate); plus any other related local cost, and
custom duties and other import taxes already paid
or to be paid on the Goods already imported.
(ii)
the custom duties and other import taxes already
paid (need to be supported with documentary
evidence) or to be paid on the Goods already
imported;
(iii) the price of the Goods, obtained as the difference
between (i) and (ii) above;
(iv) any Purchaser’s Country sales and other taxes
which will be payable on the Goods if the contract
is awarded to the Bidder; and
(v)
(d)
the price for inland transportation, insurance, and
other local services required to convey the Goods
from the named place of destination to their final
destination (Project Site) specified in the BDS.
for Related Services, other than inland transportation
and other services required to convey the Goods to their
final destination, whenever such Related Services are
specified in the Schedule of Requirements:
(i)
the price of each item comprising the Related
Services (inclusive of any applicable taxes).
14.7 Prices quoted by the Bidder shall be fixed during the Bidder’s
performance of the Contract and not subject to variation on any
14
Section I Instructions to Bidders
account, unless otherwise specified in the BDS. A Bid submitted
with an adjustable price quotation shall be treated as non
responsive and shall be rejected, pursuant to ITB Clause 30.
However, if in accordance with the BDS, prices quoted by the
Bidder shall be subject to adjustment during the performance of
the Contract, a bid submitted with a fixed price quotation shall
not be rejected, but the price adjustment shall be treated as zero.
14.8 If so indicated in ITB Sub-Clause 1.1, bids are being invited for
individual contracts (lots) or for any combination of contracts
(packages). Unless otherwise indicated in the BDS, prices
quoted shall correspond to 100 % of the items specified for each
lot and to 100% of the quantities specified for each item of a lot.
Bidders wishing to offer any price reduction (discount) for the
award of more than one Contract shall specify the applicable
price reduction in accordance with ITB Sub-Clause 14.4
provided the bids for all lots are submitted and opened at the
same time.
Currencies of Bid
15.1 The Bidder shall quote in the currency of the Purchaser’s
Country the portion of the bid price that corresponds to
expenditures incurred in the currency of the Purchaser’s country,
unless otherwise specified in the BDS.
15.2 The Bidder may express the bid price in the currency of any
country in accordance with Section V, Eligible countries. If the
Bidder wishes to be paid in a combination of amounts in
different currencies, it may quote its price accordingly but shall
use no more than three currencies in addition to the currency of
the Purchaser’s Country.
16.1 To establish their eligibility in accordance with ITB Clause 4,
Documents
Bidders shall complete the Bid Submission Form, included in
Establishing the
Section IV, Bidding Forms.
Eligibility of the
Bidder
17.1 To establish the eligibility of the Goods and Related Services in
Documents
accordance with ITB Clause 5, Bidders shall complete the
Establishing the
country of origin declarations in the Price Schedule Forms,
Eligibility of the
included in Section IV, Bidding Forms.
Goods and
Related
Services
Documents
Establishing the
Conformity of
the Goods and
Related
18.1 To establish the conformity of the Goods and Related Services to
the Bidding Documents, the Bidder shall furnish as part of its
Bid the documentary evidence that the Goods conform to the
technical specifications and standards specified in Section VI,
Schedule of Requirements.
Section I Instructions to Bidders
Services
15
18.2 The documentary evidence may be in the form of literature,
drawings or data, and shall consist of a detailed item by item
description of the essential technical and performance
characteristics of the Goods and Related Services, demonstrating
substantial responsiveness of the Goods and Related Services to
the technical specification, and if applicable, a statement of
deviations and exceptions to the provisions of the Schedule of
Requirements.
18.3 The Bidder shall also furnish a list giving full particulars,
including available sources and current prices of spare parts,
special tools, etc., necessary for the proper and continuing
functioning of the Goods during the period specified in the BDS
following commencement of the use of the goods by the
Purchaser.
18.4 Standards for workmanship, process, material, and equipment, as
well as references to brand names or catalogue numbers
specified by the Purchaser in the Schedule of Requirements, are
intended to be descriptive only and not restrictive. The Bidder
may offer other standards of quality, brand names, and/or
catalogue numbers, provided that it demonstrates, to the
Purchaser’s satisfaction, that the substitutions ensure substantial
equivalence or are superior to those specified in the Schedule of
Requirements.
Documents
Establishing the
Qualifications
of the Bidder
19.1 The documentary evidence of the Bidder’s qualifications to
perform the contract if its bid is accepted shall establish to the
Purchaser’s satisfaction:
(a)
that, if required in the BDS, a Bidder that does not
manufacture or produce the Goods it offers to supply shall
submit the Manufacturer’s Authorization using the form
included in Section IV, Bidding Forms to demonstrate that it
has been duly authorized by the manufacturer or producer of
the Goods to supply these Goods in the Purchaser’s Country;
(b)
that, if required in the BDS, in case of a Bidder not doing
business within the Purchaser’s Country, the Bidder is or
will be (if awarded the contract) represented by an Agent
in the country equipped and able to carry out the Supplier’s
maintenance, repair and spare parts-stocking obligations
prescribed in the Conditions of Contract and/or Technical
Specifications; and
(c)
that the Bidder meets each of the qualification criterion
specified in Section III, Evaluation and Qualification
16
Section I Instructions to Bidders
Criteria.
Period of Validity
of Bids
20.1 Bids shall remain valid for the period specified in the BDS after
the bid submission deadline date prescribed by the Purchaser. A
bid valid for a shorter period shall be rejected by the Purchaser
as non responsive.
20.2 In exceptional circumstances, prior to the expiration of the bid
validity period, the Purchaser may request bidders to extend the
period of validity of their bids. The request and the responses
shall be made in writing. If a Bid Security is requested in
accordance with ITB Clause 21, it shall also be extended for a
corresponding period. A Bidder may refuse the request without
forfeiting its Bid Security. A Bidder granting the request shall
not be required or permitted to modify its bid, except as provided
in ITB Sub-Clause 20.3.
20.3 In the case of fixed price contracts, if the award is delayed by a
period exceeding fifty-six (56) days beyond the expiry of the
initial bid validity, the Contract price shall be adjusted as
specified in the request for extension. Bid evaluation shall be
based on the Bid Price without taking into consideration the
above correction.
Bid Security
21.1 The Bidder shall furnish as part of its bid, a Bid Security or a
Bid-Securing Declaration, if required, as specified in the BDS.
21.2 The Bid Security shall be in the amount specified in the BDS and
denominated in the currency of the Purchaser’s Country or a
freely convertible currency, and shall:
(a)
at the bidder’s option, be in the form of either a letter of
credit, or a bank guarantee from a banking institution, or a
bond issued by a surety;
(b)
be issued by a reputable institution selected by the bidder
and located in any eligible country. If the institution issuing
the bond is located outside the Purchaser’s Country, it shall
have a correspondent financial institution located in the
Purchaser’s Country to make it enforceable.
(c)
be substantially in accordance with one of the forms of Bid
Security included in Section IV, Bidding Forms, or other
form approved by the Purchaser prior to bid submission;
(d)
be payable promptly upon written demand by the Purchaser
in case the conditions listed in ITB Clause 21.5 are
Section I Instructions to Bidders
17
invoked;
(e)
be submitted in its original form; copies will not be
accepted;
(f)
remain valid for a period of 28 days beyond the validity
period of the bids, as extended, if applicable, in accordance
with ITB Clause 20.2;
21.3 If a Bid Security or a Bid- Securing Declaration is required in
accordance with ITB Sub-Clause 21.1, any bid not accompanied
by a substantially responsive Bid Security or Bid Securing
Declaration in accordance with ITB Sub-Clause 21.1, shall be
rejected by the Purchaser as non-responsive.
21.4 The Bid Security of unsuccessful Bidders shall be returned as
promptly as possible upon the successful Bidder’s furnishing of
the Performance Security pursuant to ITB Clause 44.
21.5 The Bid Security may be forfeited or the Bid Securing
Declaration executed:
(a)
if a Bidder withdraws its bid during the period of bid
validity specified by the Bidder on the Bid Submission
Form, except as provided in ITB Sub-Clause 20.2; or
(b)
if the successful Bidder fails to:
(i)
sign the Contract in accordance with ITB Clause 43;
(ii)
furnish a Performance Security in accordance with
ITB Clause 44.
21.6 The Bid Security or Bid- Securing Declaration of a JV must be in
the name of the JV that submits the bid. If the JV has not been
legally constituted at the time of bidding, the Bid Security or
Bid-Securing Declaration shall be in the names of all future
partners as named in the letter of intent mentioned in Section IV
“Bidding Forms,” Bidder Information Form Item 7.
21.7 If a bid security is not required in the BDS, and
(a)
if a Bidder withdraws its bid during the period of bid
validity specified by the Bidder on the Letter of Bid Form,
except as provided in ITB 20.2, or
(b)
if the successful Bidder fails to: sign the Contract in
accordance with ITB 43; or furnish a performance security
in accordance with ITB 44;
18
Section I Instructions to Bidders
the Borrower may, if provided for in the BDS, declare the
Bidder disqualified to be awarded a contract by the Purchaser for
a period of time as stated in the BDS.
Format and
Signing of Bid
22.1 The Bidder shall prepare one original of the documents
comprising the bid as described in ITB Clause 11 and clearly
mark it “ORIGINAL.” In addition, the Bidder shall submit copies
of the bid, in the number specified in the BDS and clearly mark
them “COPY.” In the event of any discrepancy between the
original and the copies, the original shall prevail.
22.2 The original and all copies of the bid shall be typed or written in
indelible ink and shall be signed by a person duly authorized to
sign on behalf of the Bidder.
22.3 Any interlineation, erasures, or overwriting shall be valid only if
they are signed or initialed by the person signing the Bid.
Submission and Opening of Bids
Submission,
Sealing and
Marking of
Bids
23.1 Bidders may always submit their bids by mail or by hand. When
so specified in the BDS, bidders shall have the option of
submitting their bids electronically.
(a)
Bidders submitting bids by mail or by hand, shall enclose
the original and each copy of the Bid, including alternative
bids, if permitted in accordance with ITB Clause 13, in
separate sealed envelopes, duly marking the envelopes as
“ORIGINAL” and “COPY.” These envelopes containing the
original and the copies shall then be enclosed in one single
envelope. The rest of the procedure shall be in accordance
with ITB sub-Clauses 23.2 and 23.3.
(b)
Bidders submitting bids electronically shall follow the
electronic bid submission procedures specified in the BDS.
23.2 The inner and outer envelopes shall:
(a)
Bear the name and address of the Bidder;
(b)
be addressed to the Purchaser in accordance with ITB SubClause 24.1;
(c)
bear the specific identification of this bidding process
indicated in ITB 1.1 and any additional identification
marks as specified in the BDS; and
(d)
bear a warning not to open before the time and date for bid
opening, in accordance with ITB Sub-Clause 27.1.
23.3 If all envelopes are not sealed and marked as required, the
Section I Instructions to Bidders
19
Purchaser will assume no responsibility for the misplacement or
premature opening of the bid.
Deadline for
Submission of
Bids
24.1 Bids must be received by the Purchaser at the address and no
later than the date and time specified in the BDS.
Late Bids
25.1 The Purchaser shall not consider any bid that arrives after the
deadline for submission of bids, in accordance with ITB Clause
24. Any bid received by the Purchaser after the deadline for
submission of bids shall be declared late, rejected, and returned
unopened to the Bidder.
Withdrawal,
Substitution,
and
Modification of
Bids
26.1 A Bidder may withdraw, substitute, or modify its Bid after it has
been submitted by sending a written notice in accordance with
ITB Clause 23, duly signed by an authorized representative, and
shall include a copy of the authorization (the power of attorney)
in accordance with ITB Sub-Clause 22.2, (except that no copies
of the withdrawal notice are required). The corresponding
substitution or modification of the bid must accompany the
respective written notice. All notices must be:
24.2 The Purchaser may, at its discretion, extend the deadline for the
submission of bids by amending the Bidding Documents in
accordance with ITB Clause 8, in which case all rights and
obligations of the Purchaser and Bidders previously subject to
the deadline shall thereafter be subject to the deadline as
extended.
(a)
submitted in accordance with ITB Clauses 22 and 23
(except that withdrawal notices do not require copies), and
in addition, the respective envelopes shall be clearly
marked
“WITHDRAWAL,”
“SUBSTITUTION,”
or
“MODIFICATION;” and
(b)
received by the Purchaser prior to the deadline prescribed
for submission of bids, in accordance with ITB Clause 24.
26.2 Bids requested to be withdrawn in accordance with ITB SubClause 26.1 shall be returned unopened to the Bidders.
26.3 No bid may be withdrawn, substituted, or modified in the
interval between the deadline for submission of bids and the
expiration of the period of bid validity specified by the Bidder on
the Bid Submission Form or any extension thereof.
Bid Opening
27.1 The Purchaser shall conduct the bid opening in public at the
address, date and time specified in the BDS. Any specific
electronic bid opening procedures required if electronic bidding
is permitted in accordance with ITB Sub-Clause 23.1, shall be as
20
Section I Instructions to Bidders
specified in the BDS.
27.2 First, envelopes marked “WITHDRAWAL” shall be opened and
read out and the envelope with the corresponding bid shall not be
opened, but returned to the Bidder. If the withdrawal envelope
does not contain a copy of the “power of attorney” confirming
the signature as a person duly authorized to sign on behalf of the
Bidder, the corresponding bid will be opened.
No bid
withdrawal shall be permitted unless the corresponding
withdrawal notice contains a valid authorization to request the
withdrawal and is read out at bid opening. Next, envelopes
marked “SUBSTITUTION” shall be opened and read out and
exchanged with the corresponding Bid being substituted, and the
substituted Bid shall not be opened, but returned to the Bidder.
No Bid substitution shall be permitted unless the corresponding
substitution notice contains a valid authorization to request the
substitution and is read out at bid opening. Envelopes marked
“MODIFICATION” shall be opened and read out with the
corresponding Bid. No Bid modification shall be permitted
unless the corresponding modification notice contains a valid
authorization to request the modification and is read out at Bid
opening. Only envelopes that are opened and read out at Bid
opening shall be considered further.
27.3 All other envelopes shall be opened one at a time, reading out:
the name of the Bidder and whether there is a modification; the
Bid Prices, including any discounts and alternative offers; the
presence of a Bid Security or Bid-Securing Declaration, if
required; and any other details as the Purchaser may consider
appropriate. Only discounts and alternative offers read out at
Bid opening shall be considered for evaluation. No Bid shall be
rejected at Bid opening except for late bids, in accordance with
ITB Sub-Clause 25.1.
27.4 The Purchaser shall prepare a record of the Bid opening that
shall include, as a minimum: the name of the Bidder and whether
there is a withdrawal, substitution, or modification; the Bid Price,
per lot if applicable, including any discounts, and alternative
offers if they were permitted; and the presence or absence of a
Bid Security or Bid-Securing Declaration, if one was required.
The Bidders’ representatives who are present shall be requested
to sign the attendance sheet. A copy of the record shall be
distributed to all Bidders who submitted bids in time, and posted
online when electronic bidding is permitted.
Evaluation and Comparison of Bids
Section I Instructions to Bidders
Confidentiality
21
28.1 Information relating to the examination, evaluation, comparison,
and postqualification of bids, and recommendation of contract
award, shall not be disclosed to bidders or any other persons not
officially concerned with such process until publication of the
Contract Award.
28.2 Any effort by a Bidder to influence the Purchaser in the
examination, evaluation, comparison, and postqualification of
the bids or contract award decisions may result in the rejection of
its Bid.
28.3 Notwithstanding ITB Sub-Clause 28.2, from the time of bid
opening to the time of Contract Award, if any Bidder wishes to
contact the Purchaser on any matter related to the bidding
process, it should do so in writing.
Clarification of
Bids
29.1 To assist in the examination, evaluation, comparison and postqualification of the bids, the Purchaser may, at its discretion, ask
any Bidder for a clarification of its Bid. Any clarification
submitted by a Bidder in respect to its Bid and that is not in
response to a request by the Purchaser shall not be considered.
The Purchaser’s request for clarification and the response shall
be in writing. No change in the prices or substance of the Bid
shall be sought, offered, or permitted, except to confirm the
correction of arithmetic errors discovered by the Purchaser in the
Evaluation of the bids, in accordance with ITB Clause 31.
Responsiveness of
Bids
30.1 The Purchaser’s determination of a bid’s responsiveness is to be
based on the contents of the bid itself.
30.2 A substantially responsive Bid is one that conforms to all the
terms, conditions, and specifications of the Bidding Documents
without material deviation, reservation, or omission. A material
deviation, reservation, or omission is one that:
(a)
affects in any substantial way the scope, quality, or
performance of the Goods and Related Services specified
in the Contract; or
(b)
limits in any substantial way, inconsistent with the Bidding
Documents, the Purchaser’s rights or the Bidder’s
obligations under the Contract; or
(c)
if rectified would unfairly affect the competitive position of
other bidders presenting substantially responsive bids.
30.3 If a bid is not substantially responsive to the Bidding Documents,
it shall be rejected by the Purchaser and may not subsequently be
made responsive by the Bidder by correction of the material
22
Section I Instructions to Bidders
deviation, reservation, or omission.
Nonconformities,
Errors, and
Omissions
31.1 Provided that a Bid is substantially responsive, the Purchaser
may waive any non-conformities or omissions in the Bid that do
not constitute a material deviation.
31.2 Provided that a bid is substantially responsive, the Purchaser may
request that the Bidder submit the necessary information or
documentation, within a reasonable period of time, to rectify
nonmaterial nonconformities or omissions in the bid related to
documentation requirements. Such omission shall not be related
to any aspect of the price of the Bid. Failure of the Bidder to
comply with the request may result in the rejection of its Bid.
31.3 Provided that the Bid is substantially responsive, the Purchaser
shall correct arithmetical errors on the following basis:
(a)
if there is a discrepancy between the unit price and the line
item total that is obtained by multiplying the unit price by
the quantity, the unit price shall prevail and the line item
total shall be corrected, unless in the opinion of the
Purchaser there is an obvious misplacement of the decimal
point in the unit price, in which case the line item total as
quoted shall govern and the unit price shall be corrected;
(b)
if there is an error in a total corresponding to the addition
or subtraction of subtotals, the subtotals shall prevail and
the total shall be corrected; and
(c)
if there is a discrepancy between words and figures, the
amount in words shall prevail, unless the amount expressed
in words is related to an arithmetic error, in which case the
amount in figures shall prevail subject to (a) and (b) above.
31.4 If the Bidder that submitted the lowest evaluated Bid does not
accept the correction of errors, its Bid shall be rejected.
Preliminary
Examination of
Bids
32.1 The Purchaser shall examine the bids to confirm that all
documents and technical documentation requested in ITB Clause
11 have been provided, and to determine the completeness of
each document submitted.
32.2 The Purchaser shall confirm that the following documents and
information have been provided in the Bid. If any of these
documents or information is missing, the offer shall be rejected.
(a)
Bid Submission Form, in accordance with ITB Sub-Clause
12.1;
Section I Instructions to Bidders
Examination of
Terms and
Conditions;
Technical
Evaluation
23
(b)
Price Schedules, in accordance with ITB Sub-Clause 12.2;
(c)
Bid Security or Bid Securing Declaration, in accordance
with ITB Clause 21, if applicable.
33.1 The Purchaser shall examine the Bid to confirm that all terms
and conditions specified in the GCC and the SCC have been
accepted by the Bidder without any material deviation or
reservation.
33.2 The Purchaser shall evaluate the technical aspects of the Bid
submitted in accordance with ITB Clause 18, to confirm that all
requirements specified in Section VI, Schedule of Requirements
of the Bidding Documents have been met without any material
deviation or reservation.
33.3 If, after the examination of the terms and conditions and the
technical evaluation, the Purchaser determines that the Bid is not
substantially responsive in accordance with ITB Clause 30, it
shall reject the Bid.
34.1 For evaluation and comparison purposes, the Purchaser shall
Conversion to
convert all bid prices expressed in amounts in various currencies
Single Currency
into an amount in a single currency specified in the BDS, using
the selling exchange rates established by the source and on the
date specified in the BDS.
Domestic
Preference
35.1 Domestic preference shall not be a factor in bid evaluation,
unless otherwise specified in the BDS.
Evaluation of Bids
36.1 The Purchaser shall evaluate each bid that has been determined,
up to this stage of the evaluation, to be substantially responsive.
36.2 To evaluate a Bid, the Purchaser shall only use all the factors,
methodologies and criteria defined in ITB Clause 36. No other
criteria or methodology shall be permitted.
36.3 To evaluate a Bid, the Purchaser shall consider the following:
(a)
evaluation will be done for Items or Lots, as specified in
the BDS; and the Bid Price as quoted in accordance with
clause 14;
(b)
price adjustment for correction of arithmetic errors in
accordance with ITB Sub-Clause 31.3;
(c)
price adjustment due to discounts offered in accordance
with ITB Sub-Clause 14.4;
24
Section I Instructions to Bidders
(d)
adjustments due to the application of the evaluation criteria
specified in the BDS from amongst those set out in
Section III, Evaluation and Qualification Criteria;
(e)
adjustments due to the application of a margin of
preference, in accordance with ITB Clause 35 if applicable.
36.4 The Purchaser’s evaluation of a bid will exclude and not take
into account:
(a)
In the case of Goods manufactured in the Purchaser’s
Country, sales and other similar taxes, which will be
payable on the goods if a contract is awarded to the Bidder;
(b)
in the case of Goods manufactured outside the Purchaser’s
Country, already imported or to be imported, customs
duties and other import taxes levied on the imported Good,
sales and other similar taxes, which will be payable on the
Goods if the contract is awarded to the Bidder;
(c)
any allowance for price adjustment during the period of
execution of the contract, if provided in the bid.
36.5 The Purchaser’s evaluation of a bid may require the
consideration of other factors, in addition to the Bid Price quoted
in accordance with ITB Clause 14. These factors may be related
to the characteristics, performance, and terms and conditions of
purchase of the Goods and Related Services. The effect of the
factors selected, if any, shall be expressed in monetary terms to
facilitate comparison of bids, unless otherwise specified in
Section III, Evaluation and Qualification Criteria. The factors,
methodologies and criteria to be used shall be as specified in ITB
36.3 (d).
36.6 If so specified in the BDS, these Bidding Documents shall allow
Bidders to quote separate prices for one or more lots, and shall
allow the Purchaser to award one or multiple lots to more than
one Bidder. The methodology of evaluation to determine the
lowest-evaluated lot combinations, is specified in Section III,
Evaluation and Qualification Criteria.
Comparison of
Bids
37.1 The Purchaser shall compare all substantially responsive bids to
determine the lowest-evaluated bid, in accordance with ITB
Clause 36.
Postqualification of
the Bidder
38.1 The Purchaser shall determine to its satisfaction whether the
Bidder that is selected as having submitted the lowest evaluated
and substantially responsive bid is qualified to perform the
Contract satisfactorily.
Section I Instructions to Bidders
25
38.2 The determination shall be based upon an examination of the
documentary evidence of the Bidder’s qualifications submitted
by the Bidder, pursuant to ITB Clause 19.
38.3 An affirmative determination shall be a prerequisite for award of
the Contract to the Bidder. A negative determination shall result
in disqualification of the bid, in which event the Purchaser shall
proceed to the next lowest evaluated bid to make a similar
determination of that Bidder’s capabilities to perform
satisfactorily.
Purchaser’s Right
to Accept Any
Bid, and to
Reject Any or
All Bids
39.1 The Purchaser reserves the right to accept or reject any bid, and
to annul the bidding process and reject all bids at any time prior
to contract award, without thereby incurring any liability to
Bidders.
Award of Contract
Award Criteria
40.1 The Purchaser shall award the Contract to the Bidder whose offer
has been determined to be the lowest evaluated bid and is
substantially responsive to the Bidding Documents, provided
further that the Bidder is determined to be qualified to perform
the Contract satisfactorily.
Purchaser’s Right
to Vary
Quantities at
Time of Award
41.1 At the time the Contract is awarded, the Purchaser reserves the
right to increase or decrease the quantity of Goods and Related
Services originally specified in Section VI, Schedule of
Requirements, provided this does not exceed the percentages
specified in the BDS, and without any change in the unit prices
or other terms and conditions of the bid and the Bidding
Documents.
Notification of
Award
42.1 Prior to the expiration of the period of bid validity, the Purchaser
shall notify the successful Bidder, in writing, that its Bid has
been accepted.
42.2 Until a formal Contract is prepared and executed, the notification
of award shall constitute a binding Contract.
42.3 The Purchaser shall publish in UNDB online and in the
dgMarket the results identifying the bid and lot numbers and the
following information: (i) name of each Bidder who submitted a
Bid; (ii) bid prices as read out at bid opening; (iii) name and
evaluated prices of each Bid that was evaluated; (iv) name of
bidders whose bids were rejected and the reasons for their
rejection; and (v) name of the winning Bidder, and the price it
offered, as well as the duration and summary scope of the
contract awarded. After publication of the award, unsuccessful
26
Section I Instructions to Bidders
bidders may request in writing to the Purchaser for a debriefing
seeking explanations on the grounds on which their bids were
not selected. The Purchaser shall promptly respond in writing to
any unsuccessful Bidder who, after Publication of contract
award, requests a debriefing.
42.4 Upon the successful Bidder’s furnishing of the signed Contract
Form and performance security pursuant to ITB Clause 44, the
Purchaser will promptly notify each unsuccessful Bidder and will
discharge its bid security, pursuant to ITB Clause 21.4.
Signing of Contract 43.1 Promptly after notification, the Purchaser shall send the
successful Bidder the Agreement and the Special Conditions of
Contract.
43.2 Within twenty-eight (28) days of receipt of the Agreement, the
successful Bidder shall sign, date, and return it to the Purchaser.
43.3 Notwithstanding ITB 43.2 above, in case signing of the Contract
Agreement is prevented by any export restrictions attributable to the
Purchaser, to the country of the Purchaser, or to the use of the
products/goods, systems or services to be supplied, where such
export restrictions arise from trade regulations from a country
supplying those products/goods, systems or services, the Bidder
shall not be bound by its bid, always provided, always provided,
however, that the Bidder can demonstrate to the satisfaction of the
Purchaser and of the Bank that signing of the Contact Agreement
has not been prevented by any lack of diligence on the part of the
Bidder in completing any formalities, including applying for
permits, authorizations and licenses necessary for the export of the
products/goods, systems or services under the terms of the Contract.
Performance
Security
44.1 Within twenty eight (28) days of the receipt of notification of
award from the Purchaser, the successful Bidder, if required,
shall furnish the Performance Security in accordance with the
GCC, using for that purpose the Performance Security Form
included in Section IX Contract forms, or another Form
acceptable to the Purchaser. The Purchaser shall promptly notify
the name of the winning Bidder to each unsuccessful Bidder and
discharge the Bid Securities of the unsuccessful bidders pursuant
to ITB Sub-Clause 21.4.
44.2 Failure of the successful Bidder to submit the above-mentioned
Performance Security or sign the Contract shall constitute
sufficient grounds for the annulment of the award and forfeiture
of the Bid Security or execution of the Bid-Securing Declaration.
In that event the Purchaser may award the Contract to the next
lowest evaluated Bidder, whose offer is substantially responsive
Section I Instructions to Bidders
27
and is determined by the Purchaser to be qualified to perform the
Contract satisfactorily.
29
Section II. Bidding Data Sheet (BDS)
The following specific data for the goods to be procured shall complement, supplement, or
amend the provisions in the Instructions to Bidders (ITB). Whenever there is a conflict, the
provisions herein shall prevail over those in ITB.
ITB Clause
Reference
A. General
ITB 1.1
The Purchaser is: THE KENYA POWER AND LIGHTING CO. LTD
ITB 1.1
The name and identification number of the ICB are: KP1/6E/2/A23
The number, identification and names of the lots comprising this ICB are:
SUPPLY OF PRIMARY SUBSTATION POWER TRANSFORMERS
ITB 2.1
The Borrower is: THE GOVERNMENT OF KENYA
ITB 2.1
The name of the Project is: KENYA ENERGY SECTOR RECOVERY
PROJECT.
ITB 4.3-4.4
A list of debarred firms is available at http://www.worldbank.org/debarr
B. Contents of Bidding Documents
ITB 7.1
For Clarification of bid purposes only, the Purchaser’s address is:
Attention: Eng. Stanley Mutwiri, Project Leader
Energy Sector Recovery Project,
The Kenya Power and Lighting Company
Stima Sacco Building, Kolobot Road
Second Floor
P.O Box 00100-30099
Nairobi, Kenya
Telephone:254-20-3201726
Facsimile Number:254-20-3201889
Electronic mail address: Smutwiri@kplc.co.ke
C. Preparation of Bids
ITB 10.1
The language of the bid is: ENGLISH
30
ITB 11.1 (h)
Section II Bid Data Sheet
The Bidder shall submit the following additional documents in its bid:
(a) Copies of Type Test Reports of the Transformers as specified in
accordance with the requirements of IEC 60076, latest editions.
Copies of Type Test Reports shall meet the following requirements:
i. Type Test Reports shall be carried out by a
laboratory independent from the manufacturer.
In case of the tests having been conducted by a
National
Testing
Laboratory/Standards
Authority, a copy of the accreditation certificate
for the laboratory/standards authority shall also
be submitted in accordance with IEC17025
requirements. Any translations of certificates and
test reports into English language shall be signed
and stamped by the Testing Authority
ii. Testing materials and equipment in Type Test
Reports shall have the same code/ country /
manufacturer and technical parameters as
offered materials and equipment.
iii. Type Test Reports shall include all testing items,
testing results to meet the requirements of
applied standards as stipulated in Tender
Documents.
(b) Duly filled Technical schedules as per Annex A of the schedule of
requirement
(c) Construction and dimensional Drawings for the transformers, tap
changer and other ancillaries.
(d) Technical data for Automatic voltage regulation relays.
ITB 13.1
Alternative Bids shall not be considered.
ITB 14.5
The Incoterms edition is: Incoterms 2000.
ITB 14.6 (b)
(i) and (c)
(iii)
Place of Destination: CIP NAIROBI
ITB 14.6 (a)
(iii);(b)(ii)
and (c)(v)
“Final destination: KPLC Nairobi South Stores at Industrial Area Lunga
Lunga Road, NAIROBI
Section II Bid Data Sheet
31
ITB 14.6 (b)
(iii)
N/A
ITB 14.7
The prices quoted by the Bidder shall not be adjustable. If prices shall be
adjustable, the methodology is specified in Section III Evaluation and
Qualification Criteria.
ITB 14.8
Prices quoted shall correspond at least to 100 % of the items specified.
Prices quoted for each item shall correspond at least to 100 % percent of
the quantities specified for the item.
ITB 15.1
The Bidder is required to quote in the currency of the Purchaser’s Country
the portion of the bid price that corresponds to expenditures incurred in
that currency.
ITB 18.3
Period of time the Goods are expected to be functioning (for the purpose of
spare parts): N/A
ITB 19.1 (a)
Manufacturer’s authorization is: required
ITB 19.1 (b)
After sales service is: required
ITB 20.1
The bid validity period shall be 120 days.
ITB 21.1
Bid shall include a Bid Security (issued by bank or surety) included in
Section IV Bidding Forms.
ITB 21.2
The amount of the Bid Security shall be as follows: USD 150,000
ITB 21.7
N/A
ITB 22.1
In addition to the original of the bid, the number of copies is: 2 copies
D. Submission and Opening of Bids
ITB 23.1
Bidders shall not have the option of submitting their bids electronically.
ITB 23.1 (b)
N/A
ITB 23.2 (c)
The inner and outer envelopes shall bear the following additional
32
Section II Bid Data Sheet
identification marks:
Supply of Primary Substation Power Transformers - KP1/6E/2/A23
ITB 24.1
For bid submission purposes, the Purchaser’s address is:
The Company Secretary
The Kenya Power and Lighting Company
Stima Plaza, Kolobot Road
7th Floor, Company Secretary’s Office
P.O Box 00100-30099
Nairobi, Kenya
Telephone:254-20-3201731
Facsimile Number:254-20-3201889
The deadline for the submission of bids is:
Date: 17TH August 2012
Time: 10:00 a.m.
ITB 27.1
The bid opening shall take place at:
The Kenya Power and Lighting Company
Stima Plaza
Street Address: Kolobot Road, Parklands
Floor: Ground Floor , Room number: Stima Plaza Auditorium
City: Nairobi
Country: Kenya
Date: 17TH August 2012
Time: 10:00 a.m.
E. Evaluation and Comparison of Bids
ITB 34.1
Bid prices expressed in different currencies shall be converted in: KES
The source of exchange rate shall be: The Central Bank of Kenya (Selling
Exchange)
Rate at the closing date of submission of bids.
ITB 35.1
ITB 36.3(a)
Domestic preference shall not be a bid evaluation factor.
Bidders shall quote for all items as specified in the schedule of prices
Section II Bid Data Sheet
ITB 36.3(d)
ITB 36.6
33
The adjustments shall be determined using the following criteria, from
amongst those set out in Section III, Evaluation and Qualification Criteria:
(a)
Deviations in delivery schedule: “NO” consistent with Section
III- clause 2 (b).
(b)
Deviation in payment schedule: Yes.
N/A
F. Award of Contract
ITB 41.1
The maximum percentage by which quantities may be increased is: 10%
The maximum percentage by which quantities may be decreased is: 10%
35
Section III. Evaluation and Qualification
Criteria
Contents
1. Domestic Preference (ITB 35.1)
2. Evaluation Criteria (ITB 36.3 (d))
3. Multiple Contracts (ITB 36.6)
4. Postqualification Requirements (ITB 38.2)
36
Section IV Bidding Forms
1. Domestic Preference (ITB 35.1)
N/A
Section IV Bidding Forms
37
37
2. Evaluation Criteria (ITB 36.3 (d))
The Purchaser’s evaluation of a bid may take into account, in addition to the Bid Price
quoted in accordance with ITB Clause 14.6, one or more of the following factors as specified
in ITB Sub-Clause 36.3(d) and in BDS referring to ITB 36.3(d), using the following criteria
and methodologies.
(a)
Delivery schedule. (as per Incoterms specified in the BDS)
The Goods specified in the List of Goods are required to be delivered within the
TIME specified in Section VI, Delivery Schedule. No credit will be given to
deliveries before the earliest date, and bids offering delivery after the final date
shall be treated as non responsive.
(b)
Deviation in payment schedule.
Bidders shall state their bid price for the payment schedule outlined in the SCC.
Bids shall be evaluated on the basis of this base price. Bidders are, however,
permitted to state an alternative payment schedule and indicate the reduction in bid
price they wish to offer for such alternative payment schedule. The Purchaser may
consider the alternative payment schedule and the reduced bid price offered by the
Bidder selected on the basis of the base price for the payment schedule outlined in
the SCC.
.
3. Multiple Contracts (ITB 36.6)
N/A
38
Section IV Bidding Forms
4. Post Qualification Requirements (ITB 38.2)
After determining the lowest-evaluated bid in accordance with ITB Sub-Clause 37.1, the
Purchaser shall carry out the post qualification of the Bidder in accordance with ITB Clause
38, using only the requirements specified. Requirements not included in the text below shall
not be used in the evaluation of the Bidder’s qualifications.
1)
Financial Capability
The Bidder shall furnish documentary evidence that it meets the following
financial requirement(s):
a) That it has access to credit or liquid assets of up to US$ 500,000. This
may be in the form of a letter from the bidder’s bankers or audited
financial statements for the last two (2) years.
b) In the event of a joint venture all parties combined must meet the
requirement in 1 (a) above.
2)
Experience and Technical Capacity
The Bidder shall furnish documentary evidence to demonstrate that the Power
Transformer Manufacturer has supplied at least equal quantities of the same size
and type of Transformer outside the country of manufacture in the last 5years.The
following information will be required:
(c) Details of the contracts:
(i) The name of the project and its location.
(ii) The client’s name, address and contact person.
(iii) Project cost in US $
(d) Reference Letters
(e) The bidder shall furnish documentary evidence to demonstrate that the
Goods it offers have been manufactured in a facility which has a Valid ISO
9001 certificate or equivalent Quality Assurance Certification.
3)
The Bidder shall furnish documentary evidence to demonstrate that the Goods it
offers meet the (technical performance standards) following usage requirement:
(a) Withstand extreme tropical conditions
(b) Withstand heavy pollution.
(c) Immunity to vandalism
Section IV Bidding Forms
39
39
Section IV. Bidding Forms
Table of Forms
Bidder Information Form……………………………………………………………
40
Joint Venture Partner Information Form…………………………………………….
41
Bid Submission Form…………………………………………………………………..
42
Price Schedule: Goods Manufactured Outside the Purchaser’s Country, to be
Imported……………………………………………………………………………..
47
Price Schedule: Goods Manufactured Outside the Purchaser’s Country, already
imported………………………………………………………………………………
Error! Bookmark not defined.
Price Schedule: Goods Manufactured in the Purchaser’s Country…………………..
46
Price and Completion Schedule - Related Services……………………………………
47
Bid Security (Bank Guarantee)……………………………………………………….
48
Bid Security (Bid Bond)………………………………………………………………..
48
Manufacturer’s Authorization…………………………………………………………
50
40
Section IV Bidding Forms
Bidder Information Form
[The Bidder shall fill in this Form in accordance with the instructions
indicated below. No alterations to its format shall be permitted and no
substitutions shall be accepted.]
Date: [insert date (as day, month and year) of Bid Submission]
ICB No.: [insert number of bidding process]
Page ________ of_ ______ pages
1. Bidder’s Legal Name [insert Bidder’s legal name]
2. In case of JV, legal name of each party: [insert legal name of each party in JV]
3. Bidder’s actual or intended Country of Registration: [insert actual or intended Country of
Registration]
4. Bidder’s Year of Registration: [insert Bidder’s year of registration]
5. Bidder’s Legal Address in Country of Registration: [insert Bidder’s legal address in
country of registration]
6. Bidder’s Authorized Representative Information
Name: [insert Authorized Representative’s name]
Address: [insert Authorized Representative’s Address]
Telephone/Fax numbers: [insert Authorized Representative’s telephone/fax numbers]
Email Address: [insert Authorized Representative’s email address]
7. Attached are copies of original documents of: [check the box(es) of the attached original
documents]
 Articles of Incorporation or Registration of firm named in 1, above, in accordance with
ITB Sub-Clauses 4.1 and 4.2.


In case of JV, letter of intent to form JV or JV agreement, in accordance with ITB SubClause 4.1.
In case of government owned entity from the Purchaser’s country, documents establishing
legal and financial autonomy and compliance with commercial law, in accordance with
ITB Sub-Clause 4.5.
Section IV Bidding Forms
41
41
Joint Venture Partner Information Form
[The Bidder shall fill in this Form in accordance with the instructions indicated below].
Date: [insert date (as day, month and year) of Bid Submission]
ICB No.: [insert number of bidding process]
Page ________ of_ ______ pages
1. Bidder’s Legal Name: [insert Bidder’s legal name]
2. JV’s Party legal name: [insert JV’s Party legal name]
3. JV’s Party Country of Registration: [insert JV’s Party country of registration]
4. JV’s Party Year of Registration: [insert JV’s Part year of registration]
5. JV’s Party Legal Address in Country of Registration: [insert JV’s Party legal address
in country of registration]
6. JV’s Party Authorized Representative Information
Name: [insert name of JV’s Party authorized representative]
Address: [insert address of JV’s Party authorized representative]
Telephone/Fax numbers: [insert telephone/fax numbers of JV’s Party authorized
representative]
Email Address: [insert email address of JV’s Party authorized representative]
7. Attached are copies of original documents of: [check the box(es) of the attached original
documents]
 Articles of Incorporation or Registration of firm named in 2, above, in accordance with
ITB Sub-Clauses 4.1 and 4.2.

In case of government owned entity from the Purchaser’s country, documents
establishing legal and financial autonomy and compliance with commercial law, in
accordance with ITB Sub-Clause 4.5.
42
Section IV Bidding Forms
Bid Submission Form
[The Bidder shall fill in this Form in accordance with the instructions
indicated No alterations to its format shall be permitted and no substitutions
shall be accepted.]
Date: [insert date (as day, month and year) of Bid Submission]
ICB No.: [insert number of bidding process]
Invitation for Bid No.: [insert No of IFB]
Alternative No.: [insert identification No if this is a Bid for an alternative]
To: [insert complete name of Purchaser]
We, the undersigned, declare that:
(a)
We have examined and have no reservations to the Bidding Documents, including
Addenda No.: ______________[insert the number and issuing date of each Addenda];
(b)
We offer to supply in conformity with the Bidding Documents and in accordance with
the Delivery Schedules specified in the Schedule of Requirements the following Goods
and Related Services _______________________ [insert a brief description of the
Goods and Related Services];
(c)
The total price of our Bid, excluding any discounts offered in item (d) below, is:
______________________________[insert the total bid price in words and figures,
indicating the various amounts and the respective currencies];
(d) The discounts offered and the methodology for their application are:
Discounts. If our bid is accepted, the following discounts shall apply._______
[Specify in detail each discount offered and the specific item of the Schedule of
Requirements to which it applies.]
Methodology of Application of the Discounts. The discounts shall be applied using
the following method:__________ [Specify in detail the method that shall be used to
apply the discounts];
(e)
Our bid shall be valid for the period of time specified in ITB Sub-Clause 20.1, from the
date fixed for the bid submission deadline in accordance with ITB Sub-Clause 24.1, and
it shall remain binding upon us and may be accepted at any time before the expiration
of that period;
(f)
If our bid is accepted, we commit to obtain a performance security in accordance with
ITB Clause 44 and GCC Clause 18 for the due performance of the Contract;
Section IV Bidding Forms
43
43
(g)
We, including any subcontractors or suppliers for any part of the contract, have
nationality from eligible countries________ [insert the nationality of the Bidder,
including that of all parties that comprise the Bidder, if the Bidder is a JV, and the
nationality each subcontractor and supplier]
(h)
We have no conflict of interest in accordance with ITB Sub-Clause 4.2;
(i)
Our firm, its affiliates or subsidiaries—including any subcontractors or suppliers for
any part of the contract—has not been declared ineligible by the Bank, under the
Purchaser’s country laws or official regulations, in accordance with ITB Sub-Clause
4.3;
(j)
The following commissions, gratuities, or fees have been paid or are to be paid with
respect to the bidding process or execution of the Contract: [insert complete name of
each Recipient, its full address, the reason for which each commission or gratuity was
paid and the amount and currency of each such commission or gratuity]
Name of Recipient
Address
Reason
Amount
(If none has been paid or is to be paid, indicate “none.”)
(k)
We understand that this bid, together with your written acceptance thereof included in
your notification of award, shall constitute a binding contract between us, until a formal
contract is prepared and executed.
(l)
We understand that you are not bound to accept the lowest evaluated bid or any other
bid that you may receive.
Signed:_______________ [insert signature of person whose name and capacity are shown]
In the capacity of _______[insert legal capacity of person signing the Bid Submission Form]
Name:____________ [insert complete name of person signing the Bid Submission Form]
Duly authorized to sign the bid for and on behalf of:_____ [insert complete name of Bidder]
Dated on ____________ day of __________________, _______ [insert date
of signing]
44
Section IV Bidding Forms
Price Schedule Forms
[The Bidder shall fill in these Price Schedule Forms in
accordance with the instructions indicated. The list of line
items in column 1 of the Price Schedules shall coincide with
the List of Goods and Related Services specified by the
Purchaser in the Schedule of Requirements.]
Section IV Bidding Forms
45
Price Schedule: Goods Manufactured Outside the Purchaser’s Country, to be Imported
Date:_________________________
ICB No: _____________________
(Group C bids, goods to be
imported)
Currencies in accordance with ITB
Sub-Clause 15
1
2
3
Alternative No: ________________
Page N ______ of ______
1
2
3
4
5
6
7
8
9
Line
Item
N
Description of Goods
Country
of
Origin
Delivery
Date as
defined by
Incoterms
Quantity and
physical unit
Unit price
CIF MOMBASA
in accordance with
ITB 14.6(b) (i)
CIF Price
per line
item
(Col. 5x6)
Price per line item for
inland transportation and
other services required in
the Purchaser’s country to
convey the Goods to their
final destination specified
in BDS
Total Price per Line item
(Col. 7+8)
132KV/33KV Transformer,
45MVA
66KV/11KV, Transformer,
23MVA
7
33/11KV Transformer, 23MVA
2
8
Total CIP Price
Nairobi
Name of Bidder
Signature of Bidder
Date
46
Section IV Bidding Forms
Price Schedule: Goods Manufactured in the Purchaser’s Country
1
2
3
Purchaser’s Country
(Group A and B bids)
______________________
Currencies in accordance with ITB Sub-Clause 15
Date:_________________________
ICB No: _____________________
Alternative No: ________________
Page N ______ of ______
1
2
3
4
5
6
7
8
9
10
Line
Item
N
Description of Goods
Delivery Date
as defined by
Incoterms
Quantity and
physical unit
Unit price
EXW
Total EXW
price per line
item
(Col. 45)
Price per line item for
inland transportation and
other services required in
the Purchaser’s Country to
convey the Goods to their
final destination
Cost of local labor,
raw materials and
components from
with origin in the
Purchaser’s Country
% of Col. 5
Sales and other taxes payable
per line item if Contract is
awarded (in accordance with
ITB 14.6(a)(ii)
Total Price per
line item
(Col. 6+7)
132KV/33KV
Transformer,
45MVA
66KV/11KV,
Transformer,
23MVA
7
33/11KV
Transformer,
23MVA
2
8
Total Price
Name of Bidder
Signature of Bidder
Date
Section IV Bidding Forms
47
47
Price and Completion Schedule - Related Services
Currencies in accordance with ITB Sub-Clause 15
1
2
3
4
5
Service
N
Description of Services (excludes inland transportation
and other services required in the Purchaser’s country
to convey the goods to their final destination)
Country of
Origin
Delivery Date at place
of Final destination
Quantity and physical unit
1
132KV/33KV Transformer, 45MVA
7
2
66KV/11KV, Transformer, 23MVA
8
3
33/11KV Transformer, 23MVA
2
Total Bid Price
Name of Bidder
Signature of Bidder
Date
Date:_________________________
ICB No: _____________________
Alternative No: ________________
Page N ______ of ______
6
7
Unit price
Total Price per Service
(Col. 5*6 or estimate)
Section IV Bidding Forms
48
Bid Security (Bank Guarantee)
_______________________________
[Bank’s Name, and Address of Issuing Branch or Office]
Beneficiary: ___________________ [Name and Address of Purchaser]
Date: ________________
BID GUARANTEE No.:
_________________
We have been informed that
(hereinafter called "the Bidder") has submitted to
you its bid dated (hereinafter called "the Bid") for the execution of
under
Invitation for Bids No
(“the IFB”).
Furthermore, we understand that, according to your conditions, bids must be supported by a
bid guarantee.
At the request of the Bidder, we
hereby irrevocably undertake to pay you any sum
or sums not exceeding in total an amount of
,
(
(amount in words])
upon receipt by us of your first demand in writing accompanied by a written statement
stating that the Bidder is in breach of its obligation(s) under the bid conditions, because the
Bidder:
(a)
has withdrawn its Bid during the period of bid validity specified by the Bidder in the
Form of Bid; or
(b)
having been notified of the acceptance of its Bid by the Purchaser during the period of
bid validity, (i) fails or refuses to execute the Contract Form; or (ii) fails or refuses to
furnish the performance security, if required, in accordance with the Instructions to
Bidders.
This guarantee will expire: (a) if the Bidder is the successful bidder, upon our receipt of
copies of the contract signed by the Bidder and the performance security issued to you upon
the instruction of the Bidder; or (b) if the Bidder is not the successful bidder, upon the earlier
of (i) our receipt of a copy of your notification to the Bidder of the name of the successful
bidder; or (ii) twenty-eight days after the expiration of the Bidder’s Bid.
Consequently, any demand for payment under this guarantee must be received by us at the
office on or before that date.
This guarantee is subject to the Uniform Rules for Demand Guarantees, ICC Publication No.
458.
_____________________________
[signature(s)]
Section IV Bidding Forms
49
49
Bid Security (Bid Bond)
[The Surety shall fill in this Bid Bond Form in accordance with the instructions indicated.]
BOND NO. ______________________
BY THIS BOND [name of Bidder] as Principal (hereinafter called “the Principal”), and
[name, legal title, and address of surety], authorized to transact business in [name of
country of Purchaser], as Surety (hereinafter called “the Surety”), are held and firmly bound
unto [name of Purchaser] as Obligee (hereinafter called “the Purchaser”) in the sum of
[amount of Bond]6 [amount in words], for the payment of which sum, well and truly to be
made, we, the said Principal and Surety, bind ourselves, our successors and assigns, jointly
and severally, firmly by these presents.
WHEREAS the Principal has submitted a written Bid to the Purchaser dated the ___ day of
______, 20__, for the construction of [name of Contract] (hereinafter called the “Bid”).
NOW, THEREFORE, THE CONDITION OF THIS OBLIGATION is such that if the
Principal:
(a)
withdraws its Bid during the period of bid validity specified in the Form of Bid; or
(b)
having been notified of the acceptance of its Bid by the Purchaser during the period of
Bid validity; (i) fails or refuses to execute the Contract Form; or (ii) fails or refuses to
furnish the Performance Security, if required, in accordance with the Instructions to
Bidders.
then the Surety undertakes to immediately pay to the Purchaser up to the above amount upon
receipt of the Purchaser’s first written demand, without the Purchaser having to substantiate
its demand, provided that in its demand the Purchaser shall state that the demand arises from
the occurrence of any of the above events, specifying which event(s) has occurred.
The Surety hereby agrees that its obligation will remain in full force and effect up to and
including the date 28 days after the date of expiration of the Bid validity as stated in the
Invitation to Bid or extended by the Purchaser at any time prior to this date, notice of which
extension(s) to the Surety being hereby waived.
IN TESTIMONY WHEREOF, the Principal and the Surety have caused these presents to be
executed in their respective names this ____ day of ____________ 20__.
Principal: _______________________
Surety: _____________________________
Corporate Seal (where appropriate)
_______________________________
(Signature)
(Printed name and title)
____________________________________
(Signature)
(Printed name and title)
6 The amount of the Bond shall be denominated in the currency of the Purchaser’s country or the equivalent amount in a freely
convertible currency.
50
Section IV Bidding Forms
Manufacturer’s Authorization
[The Bidder shall require the Manufacturer to fill in this Form in accordance with the
instructions indicated. This letter of authorization should be on the letterhead of the
Manufacturer and should be signed by a person with the proper authority to sign documents
that are binding on the Manufacturer. The Bidder shall include it in its bid, if so indicated in
the BDS.]
Date: [insert date (as day, month and year) of Bid Submission]
ICB No.: [insert number of bidding process]
Alternative No.: [insert identification No if this is a Bid for an alternative]
To: [insert complete name of Purchaser]
WHEREAS
We [insert complete name of Manufacturer], who are official manufacturers of [insert type
of goods manufactured], having factories at [insert full address of Manufacturer’s factories],
do hereby authorize [insert complete name of Bidder] to submit a bid the purpose of which is
to provide the following Goods, manufactured by us [insert name and or brief description of
the Goods], and to subsequently negotiate and sign the Contract.
We hereby extend our full guarantee and warranty in accordance with Clause 28 of the
General Conditions of Contract, with respect to the Goods offered by the above firm.
Signed: [insert signature(s) of authorized representative(s) of the Manufacturer]
Name: [insert complete name(s) of authorized representative(s) of the Manufacturer]
Title: [insert title]
Dated on ____________ day of __________________, _______ [insert date of signing]
51
Section V. Eligible Countries
Eligibility for the Provision of Goods, Works and Services in Bank-Financed
Procurement
1.
In accordance with Para 1.8 of the Guidelines: Procurement under IBRD Loans and
IDA Credits, dated May 2004, the Bank permits firms and individuals from all
countries to offer goods, works and services for Bank-financed projects. As an
exception, firms of a Country or goods manufactured in a Country may be excluded
if:
Para 1.8 (a) (i): as a matter of law or official regulation, the Borrower’s Country
prohibits commercial relations with that Country, provided that the Bank is
satisfied that such exclusion does not preclude effective competition for the
supply of the Goods or Works required, or
Para 1.8 (a) (ii): by an Act of Compliance with a Decision of the United Nations
Security Council taken under Chapter VII of the Charter of the United
Nations, the Borrower’s Country prohibits any import of goods from that
Country or any payments to persons or entities in that Country.
2.
For the information of bidders, at the present time firms, goods and services from the
following countries are excluded from this bidding:
(a)
With reference to paragraph 1.8 (a) (i) of the Guidelines:
None
(b)
With reference to paragraph 1.8 (a) (ii) of the Guidelines:
None
53
PART 2 – Supply Requirements
54
Section VI. Schedule of Requirements
Contents
1. List of Goods and Delivery Schedule ............................................................................. 55
2. List of Related Services and Completion Schedule ...................................................... 56
3. Technical Specifications .................................................................................................. 55
4. Drawings .......................................................................................................................... 56
5. Inspections and Tests ....................................................................................................... 55
55
1. List of Goods and Delivery Schedule
Line Item
N
1
2
3
Description of Goods
Quantity
Physical
unit
Final (Project
Site)
Destination as
specified in
BDS
132KV/33KV Transformer,
45MVA
66KV/11KV, Transformer,
23MVA
7
Nairobi
8
Nairobi
33/11KV Transformer,
23MVA
2
Nairobi
Delivery (as per Incoterms) Date
Latest Delivery Date
9 Months after date of
contract signature
9 Months after date of
contract signature
9 Months after date of
contract signature
Bidder’s offered
Delivery date [to be
provided by the
bidder]
56
Section VI Schedule of Requirements
2.
List of Related Services and Completion Schedule
[This table shall be filled in by the Purchaser. The Required Completion Dates should be realistic, and consistent with the required
Goods Delivery Dates (as per Incoterms)]
Service
[insert
Service
No]
1. If applicable
Description of Service
[insert description of Related Services]
Quantity1
Physical Unit
[insert quantity of
items to be
supplied]
[insert physical
unit for the items]
Place where Services
shall be performed
[insert name of the
Place]
Final
Completion
Date(s) of
Services
[insert
required
Completion
Date(s)]
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
THE KENYA POWER & LIGHTING COMPANY LIMITED
SPECIFICATION
for
POWER TRANSFORMERS
Page iKenya Power and Lighting Company Limited Substation Bidding Contract – April2012
3
Section VI. Schedule of Requirements
TECHNICAL SPECIFICATION FOR POWER
TRANSFORMERS
General
This Chapter of the Employer’s Requirements provides for design, engineering,
manufacture, testing at the manufacturer’s works, delivery at site including all materials,
accessories, spares, unloading, handling, 50 Hz, mineral oil-immersed, power transformers,
suitable for outdoor installation under the service conditions mentioned herein.
The transformers shall be of the conservator type, fitted with external coolers and an on load
tap changer and other accessories as described herein and shall comply with IEC 60076
and with these Employer’s Requirements.
The transformers shall be ONAN/ONAF.and shall be fitted with other accessories as
described herein and shall comply with IEC 60076 and with these Employer’s
Requirements.
Location
Voltage
kV
Rating MVA
Tap
Changer
Altitude
Number
Required
Vector
group
Lessos
132/33
18/23MVA
ONAN/ONAF
On-load
2200m
One
Dyn11
VOI
132/33
12/15MVA
ONAN/ONAF
On-load
2200m
One
YNynd1
Kamburu
132/33
18/23MVA
ONAN/ONAF
On-load
2200m
One
YDyn1
Meru
132/33
18/23MVA
ONAN/ONAF
On-load
2200m
One
Dyn1
Naivasha
132/33
18/23
ONAN/ONAF
On-load
2200m
One
Dyn11
Lanet
132/33
18/23
ONAN/ONAF
On-load
2200m
One
Dyn11
33/11KV
18/23
ONAN/ONAF
On-load
2200m
Two
Ynynd1
132/33
18/23MVA
ONAN/ONAF
On-load
2400m
One
Dyn11
Diani
Miritini
Makutano
,
4
Section VI Schedule of Requirements
Location
Voltage
kV
Rating MVA
Tap
Changer
Altitude
Number
Required
Vector
group
(1)Steel
Billets,
(2)Gigiri,
(3)Syokimau,
(4) Kabete
66/11KV
18/23
ONAN/ONAF
On-load
2200m
Eight
Dyn1
(5) Matasia
(6) Cianda
(7) NSSF
(8) EPZ
The transformers shall be designed for not less than a 40 year lifetime under full load
operation and supplied together with all ancillary equipment for complete installation and
spare parts as recommended by the Contractor.
The design of the Transformer shall match existing transformers in the respective
locations in the following aspects; step voltages, number of taps and all other
parameters required for parallel operation of the transformers. The voltage control
scheme shall take into consideration this requirement. The designs shall be subject
to approval of the employer.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Technical specifications for 132KV/33KV
Transformers
FOREWORD
1.
SCOPE
2.
REFERENCES
3.
TERMS AND DEFINITIONS
4.
REQUIREMENTS
5.
TESTS AND INSPECTION
6.
MARKING, LABELLING AND PACKING
ANNEX A:
Guaranteed Technical Particulars (to be filled and signed by the
Manufacturer and submitted together with copies of manufacturer’s
catalogues, brochures, drawings, technical data, sales records and
copies of type test certificates and type test reports for tender
evaluation)
Page 5Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
6
1.
Section VI Schedule of Requirements
SCOPE
This specification is for newly manufactured outdoor oil type power
transformer as described below:
23MVA, 132000/33000 volts, 50 Hz, ONAN/ONAF three phase power
transformer (the Vector Group shall be stated on the schedule of
requirements in the tender).
The specification also covers inspection and test of the transformer as well as
schedule of Guaranteed Technical Particulars to be filled, signed by the
manufacturer and submitted for tender evaluation.
The specification stipulates the minimum requirements for 23MVA
132kV/33kV power transformer acceptable for use in the company and it shall
be the responsibility of the Manufacturer to ensure adequacy of the design,
good workmanship and good engineering practice in the manufacture of the
transformer for KPLC.
The specification does not purport to include all the necessary provisions of a
contract.
2.
REFERENCES
The following standards contain provisions which, through reference in
this text constitute provisions of this specification. Unless otherwise
stated, the latest editions (including amendments) apply.
ISO 1461:
IEC 60076:
Hot dip galvanized coatings on fabricated iron and steel articles
– Specifications and test methods.
Power transformers.
IEC 60044: Instrument transformers.
IEC 60296: Specification for unused mineral insulating oil for transformers
and switchgear.
IEC 60354:
Loading guide for oil – immersed power transformers.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
IEC 60214: Tap-changers - Part 1: Performance requirements and test
methods, Part 2: Application guide.
IEC 60512:
Connectors for electronic equipment
BS 171: Power transformers
BS 381C:
purposes
Specification for colours for identification coding and special
3.
TERMS AND DEFINITIONS
3.1
The terms and definitions given in the reference standards shall apply.
3.2
The term similar rating where used in this specification shall be for
transformer ratings within the range 23MVA – 100MVA and primary voltage
rating of 132kV – 400kV and secondary voltage of 33kV – 66kV.
4.
REQUIREMENTS
4.1
Service Conditions
4.1.1 Operating conditions
The transformer shall be suitable for continuous outdoor operation in
tropical areas with the following conditions.
(a)
Altitude:
Up to 2200 metres above sea level.
(b)
ºC
Temperature: average of +30ºC with a minimum of -1ºC and max +40
(c)
Humidity:
up to 95%,
(d)
Pollution:
Design pollution level to be taken as “Very Heavy”
(Pollution level IV) according to IEC 815.
(e)
Isokeraunic level: 180 thunderstorm days per year
4.1.2 System characteristics
a) The primary HV system is 132,000 volts, 3 phase, 3 wire, 50Hz, with
neutral point solidly earthed.
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8
Section VI Schedule of Requirements
b) The secondary MV system is 33,000 volts, 3 phase, 3 wire, 50Hz, with
neutral point solidly earthed.
c) The Transformer shall be operated at a high loading factor.
4.2
4.2.1
General Requirements
The transformer shall be outdoor, oil-immersed, of ONAN/ONAF
classification and core type (lamination stackings). All offers shall comply with
the requirements of IEC 60076. Any deviations/additional requirements shall
be as stated in this specification.
4.2.2 The transformer shall be a three-phase integral unit.
4.2.3 The transformer shall be of the free breathing type. A dehydrating cobalt free
breather of approved design shall be provided.
4.2.4 The transformer and accessories shall be designed to facilitate operation,
inspection, maintenance and repairs. All apparatus shall be designed to
ensure satisfactory operation under such sudden variations of load and
voltage as may be met with under working conditions on the system, including
those due to short circuits.
4.2.5 The design shall incorporate every reasonable precaution and provision for
the safety of all those concerned in the operation and maintenance of the
equipment keeping in view the regulatory requirements in Kenya.
4.2.6 All material used shall be new and of the best quality and of the class most
suitable for working under the conditions specified in clause 4.1 and shall
withstand the variations of temperatures and atmospheric conditions arising
under working conditions without undue distortion or deterioration or the
setting up of undue stresses in any part, and also without affecting the
strength and suitability of the various parts for the work which they have to
perform.
4.2.7 Corresponding parts liable to be replaced shall be interchangeable.
4.2.8 All outdoor apparatus, including bushings insulators with their mountings,
shall be designed so as to avoid pockets in which water can collect.
4.2.9 All connections and contacts shall be of ample section and surface for
carrying continuously the specified currents without undue heating and fixed
connections shall be secured by bolts or set screws of ample size, adequately
locked. Lock nuts shall be used on stud connections carrying current. All
leads from the winding to the terminals and bushings shall be adequately
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
supported to prevent injury from vibration including a systematical pull under
short circuit conditions.
4.2.10 All apparatus shall be designed to minimize the risk or accidental short-circuit
caused by animals, birds or vermin.
4.2.11 In tank on-load-tap changers shall be located such that the space above the
diverter switch chamber will be free of inter-connecting pipes etc. for lifting the
diverter switch unit for inspection and maintenance purposes.
4.2.12 Galvanizing shall be applied by the hot-dipped process to ISO 1461 and for
all parts other than steel wires shall consist of a thickness of zinc coating
equivalent to not less than 610g of zinc per square meter of surface. The zinc
coating shall be smooth, clean and of uniform thickness and free from
defects. The preparation of galvanizing and the galvanizing itself shall not
adversely affect the mechanical properties of the coated material. The quality
will be established by tests as per ISO 1461.
4.2.13 All bolts, nuts, and washers exposed to atmosphere and in contact with nonferrous parts which carry current shall be of phosphor bronze.
4.2.14 If bolts and nuts are placed so that they are inaccessible by means of
ordinary spanners, suitable special spanners shall be provided by the
supplier.
4.2.15 Except for hardware, which may have to be removed at site, all external
surfaces shall receive at least four coats of paint. The total dry film thickness
shall be between 100 and 130 microns.
4.2.16 Descriptive labels for mounting indoors or inside cubicles and kiosks shall be
of material that will ensure permanence of the lettering. A matt or satin finish
shall be provided to avoid dazzle from reflected light. Labels mounted on dark
surface shall have white lettering on a black background. Danger notices shall
have red lettering on a white background.
4.2.17 All interior surfaces of chambers or kiosks that are in contact with air shall
receive at least three coats of paint, of which the topcoat shall be of a light
shade.
4.2.18 The design and all materials and processes used in the manufacture of the
transformer, shall be such as to reduce to a minimum the risk of the
development of acidity in the oil.
4.2.19 Every care shall be taken to ensure that the design and manufacture of the
transformers and auxiliary plant shall be such to have minimum noise and
Page 9Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
10
Section VI Schedule of Requirements
vibration levels following good modern manufacturing practices. The
maximum noise levels shall be stated in the bid.
4.3
Ratings
4.3.1 (a) The windings of the transformer shall be rated at 23MVA (ONAF), with a
minimum ONAN rating of 18 MVA. These ratings shall be for the operating
conditions stated in clause 4.1.
(b) The rating specified in this clause shall be the continuous rating at
the maximum ambient temperature and altitude given in clause 4.1.
4.3.2 (a) The transformer shall be capable of carrying its full normal rating
continuously at any tap under the conditions stated in clause 4.3.1 without
undue stress, overheating, or the temperature rise in the hottest region
exceeding 55ºC and 60ºC in oil and windings respectively.
(b) The loading capabilities shall be demonstrated by a temperature – rise
test. This test shall be done in the presence of KPLC Representatives during
factory visit.
4.3.3 The transformer shall be capable of withstanding the maximum fault level at
its rated voltage and impedance for 2 seconds. The design should cater for
the expected lifetime of the transformer.
4.3.4 The thermal ability to withstand short circuit shall be demonstrated by
calculation as per IEC 60076-5 and the calculation shall be submitted with
tender. The duration of the current to be used for the calculation of the
thermal ability to withstand short circuit shall be 2 seconds while the
maximum permissible value of the average temperature of each winding shall
be as per IEC 60076-5.
4.3.5 The ability of the transformer to withstand the dynamic effects of short circuit
shall
be demonstrated by tests and complete test reports (including oscillograms
and records of the condition of the transformer before and after the shortcircuit test) shall be submitted for tender evaluation.
4.4
Winding and Connections
4.4.1 The VECTOR GROUP shall be stated on the schedule of requirements in the
tender. Typical vector groups used in KPLC include Dyn1, Dyn11 and
YNyn0d11.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.4.2 The transformers shall be capable of operation without danger on any
particular tapping at the rated MVA when the voltage may vary by ± 10% of
the voltage corresponding to the tapping.
4.4.3 The windings and connections as well as the insulating material shall not
soften, ooze, shrink or collapse during service. The materials shall be noncatalytic and chemically inactive in transformer oil during service.
4.4.4 No strip conductor wound on edge shall have a width exceeding six times its
thickness. The conductors shall be transposed at sufficient intervals to
minimize eddy currents and equalize the current and temperature distribution
along the windings.
4.4.5 The windings and connections shall be properly braced to withstand shocks
during transportation or due to short circuit and other transient conditions
during service.
4.4.6 Adequate pre-shrinkage of the coil assembly using pre-compressed press
board material having low moisture content for the radial spacer blocks shall
be ensured by the manufacturers so that there is no displacement of the
radial spacer blocks due to frequent short circuits on the transformers.
4.4.7 All windings after being wound and all fibrous hygroscopic materials used in
the construction of the transformer shall be dried under vacuum and
impregnated with hot oil.
4.4.8 The coil clamping rings wherever used shall preferably be of flat insulated
steel laminations.
4.4.9 The radial spacer blocks must be made of pre-compressed pressboard
material, which will not soften while in contact with oil or fray out into fibers or
edges. The slots should be so dimensioned that the blocks will not come out
of the slots.
4.4.10 All joints shall be brazed/crimped considering the vibrations due to short
circuits and load fluctuations.
4.4.11 KPLC will inspect built-up winding for its quality, weight of copper, insulation
and overall weight of coil assembly. The size of conductor used for different
windings shall also be checked during stage inspection to check the current
density.
4.4.12 The transformer shall be designed with particular attention to the suppression
of harmonic voltage, especially the third and fifth, so as to eliminate waveform distortion and from any possibility of high frequency disturbances,
Page 11Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
12
Section VI Schedule of Requirements
inductive effects or of circulating currents between the neutral points at
different transforming stations reaching such a magnitude as to cause
interference with communication circuits.
4.4.13 The windings shall be designed to reduce to a minimum the out-of-balance
forces in the transformer at all voltage ratios.
4.5
Tapping
4.5.1 Tapping Range
The transformer shall be provided with tapping on the 132 kV winding for a
variation of no load primary voltage for parallel operation, with Tap No. 1
having the highest voltage assignment, as follows:
132,000 volts + 8  1.67%
- 8  1.67%
4.5.2. Tapping Method
Tapping shall be carried out by means of an on-load tap changer as
described in clause 4.12 below.
4.6
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
Core and Flux Density
a) Core
The core shall be constructed from the laminations of high grade cold rolled
non-aging, grain oriented silicon steel known as M4 or superior grade CRGO
steels of maximum 0.27mm or less lamination thickness especially suitable
for transformer core. The grade of CRGO shall be stated in the bid.
The design of the magnetic circuit shall be such as to avoid static discharges,
development of short-circuit paths within itself or to the earthed or to the
clamping structure and the production of flux components at right angles to
the plane of the laminations which may cause local heating.
Every care shall be exercised in the selection, treatment and handling of core
steel to ensure that as far is practicable, the laminations are flat and the finally
assembled core is free from distortion.
Adequate oil ducts shall be provided in the core for cooling. Tinned copper
strip bridging pieces shall be used for maintaining electrical continuity
wherever the magnetic circuit is provided into pockets by such ducts or
insulating material thicker than 0.25mm.
There shall be no movement of the core assembly relative to the tank during
transport, installation as well as in service due to sudden jerks caused by
short circuits and fluctuating loads.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.6.6 All steel sections used for supporting the core shall be thoroughly sand
blasted or shot blasted after cutting, drilling and welding. Any non-magnetic or
high resistance alloy shall be of established quality.
4.6.7 Adequate lifting lugs shall be provided to enable core and winding to be lifted.
4.6.8 The supporting framework of the Cores shall be so designed as to avoid the
presence of pockets which would prevent complete emptying of the tank
through the drain valve, or cause trapping of air during filling.
4.6.9 The insulation structure for the core to bolts and core to clamp plate shall be
such as to withstand a voltage of at least 2kV AC for one minute.
(b) Flux Density
4.6.10 The primary voltage variation, which may affect the flux density at every tap,
shall be kept in view while designing the transformer.
4.6.11 The transformer shall be so designed that the working flux density shall not
exceed 1.6 Tesla at normal voltage, frequency & ratio. Tenders with higher
flux density than specified shall not be considered.
4.6.12 Tenderers shall indicate the continuous allowable maximum flux for one
minute and five seconds.
4.6.13 The limit of flux density at which core material used saturates shall also be
stated in the tender. The name and grade of core material shall be stated in
the tender.
4.6.14 The successful tenderer shall be required to furnish magnetization curve of
the core material, design calculations and such other data/documents
deemed fit by the purchaser for being satisfied that flux density is as desired.
NOTE: The above flux density has been specified to meet with the over
fluxing of the core due to temporary over voltage of the orders of 25%
for one minute and 40% for five seconds that may appear in abnormal
conditions such as the one obtained following sudden loss of large
loads.
4.7
Losses, Regulation and Impendence
4.7.1 Losses of the transformer shall be stated and shall be subject to tolerances in
accordance with IEC 60076. The fixed losses shall be as low as is consistent
with good design, reliability and economical use of materials.
4.7.2 Voltage regulation from no-load to continuous rated output at unity power
factor, at 0.8 lagging and 0.8 leading power factor with constant voltage
across the higher voltage windings shall be stated in the bid.
4.7.3 The impedance voltage at extreme tappings and at principal tapping shall be
stated and shall be subject to tolerances in accordance with IEC 60076.
Typical values for existing transformers in KPLC at principal (nominal) tap are
Page 13Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
14
Section VI Schedule of Requirements
9.8% - 10.1%. The minimum as per IEC 60076-5 for this size of transformer is
8.0%.
4.7.4 As a minimum, the short-circuit apparent power of the system shall be taken
as 10,000MVA (as per IEC 60076-5) in order to obtain the value of the
symmetrical short circuit current to be used for the design and tests.
4.8
Terminals: Arrangement & Bushings
4.8.1 The 33kV and 132kV windings shall be brought out separately through open
bushings of outdoor, weatherproof design in accordance with IEC.
4.8.2 Bushings for 132kV terminals shall be of oil-filled condenser type
construction, draw-out type and shall each have a capacitance test point.
Bushings for 33kV terminals shall be of the solid porcelain type or condenser
type (due to insulation withstand requirements).
4.8.3 The neutral bushing of the transformer shall be identical to the corresponding
phase terminal bushings.
4.8.4 Spacing and air clearances shall be so co-ordinated as to render the
probability of a flashover from the terminal of one winding to the terminal of
another winding negligible.
4.8.5 Leakage distance of bushings shall not be less than 31mm/kV, based on
operating phase to phase voltage.
4.8.6 Bushing terminals shall be clamp type suitable for both copper and aluminium
Busbars of sizes upto 76mm diameter.
4.8.7 Each bushing of the 132kV windings shall be mounted on a turret. Each turret
shall be suitable for accommodating at least two sets of current transformers.
4.8.8 Each bushing of the 33kV windings shall be mounted on a turret. Each turret
shall be suitable for accommodating at least three sets of current
transformers.
4.8.9 Terminal arrangement on the HV and LV sides shall be N, A, B, C and n, a,
b, c respectively (this shall be indicated on drawings submitted for approval
before manufacture). Note: Neutral (N) on primary applicable only to YNyn0
transformers.
4.9
Current Transformers to be Fitted
4.9.1. Current transformers shall be installed in the bushing turrets and shall be of
the following quantities, ratios, ratings and class:
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
PHASE
HV-side
(132kV)
A
B
C
N
LV-side
(33kV)
a
b
c
n
CORE
BURDEN
RATIO
CLASS
1
2
1
2
3
1
2
-
15VA
15VA
15VA
15VA
10VA
15VA
15VA
-
100/1A
100/1A
100/1A
100/1A
100/?
100/1A
100/1A
-
cl. 5P10
cl. X
cl. 5P10
cl. X
cl. 1
cl. 5P10
cl. X
-
1
2
3
1
2
3
4
1
2
3
4
1
2
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
10VA
15VA
15VA
400/1A
400/1A
400/1A
400/1A
400/1A
400/1A
400/1A
400/1A
400/1A
400/1A
400/?
400/1A
400/1A
cl. 0.5
cl. 5P10
cl. X
cl. 0.5
cl. 5P10
cl. X
cl 0.5
cl. 0.5
cl. 5P10
cl. X
cl 1.0
cl. X
cl. 5P10
4.9.2 Current transformers of suitable rating and class for winding temperature
indicators shall be installed to adequately cover the transformer (HV & LV) as
indicated above (as 100/? and 400/?) for guidance.
4.9.3 Current transformers shall also comply with the requirements of IEC 60044.
4.9.4 Full technical particulars of current transformers offered, including type test
reports from an International reputable Testing Authority or a National
Standards and Testing Authority of the country of manufacture, shall be
submitted with tender.
4.10
AIR CLEARANCE
4.10.1 When totally assembled, as in service, electrical clearances in air shall be
adequate to withstand the assigned impulse withstand test voltages.
4.10.2 Care shall be taken to ensure that all fittings are suitably positioned so as not
to interfere with the external connection to the bushing terminals.
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Section VI Schedule of Requirements
4.10.3 Minimum external air clearances shall be as shown under.
Nominal System Voltage between Phases
33kV
132 kV
Minimum clearance phase-to-earth and
phase-to-neutral
mm
485
1475
Minimum clearance phase-to-phase
between phases of the same winding
mm
485
1475
Minimum clearance between a line terminal
of the high voltage winding and a line
terminal of a lower voltage winding
mm
485
1475
Minimum clearance from live metal to oil
pipe-work including conservator and
pressure relief device
mm
485
1630
4.11. INSULATION LEVELS
The complete transformer arranged for service, shall be capable of
withstanding the following voltages and shall comply fully with the
requirements of IEC 60076 Part 3, including the latest amendments.
Nominal
system
voltage
Highest
system
voltage
Lightning
Impulse
withstand
voltage, dry
Power
frequency
withstand
voltage, wet
(kV, rms)
33
132
(kV, rms)
36
145
(kV, peak)
(kV, rms)
200
95
650/750
275/325
(internal/external (internal/externa
)
l)
4.12. ON LOAD TAP CHANGER AND MECHANISM BOX
4.12.1 The transformer shall be complete with vacuum type on-load, electrically
driven tap changing mechanism of the high-speed resistor transition type, and
shall comply with the requirements of IEC 60214, 60512 and this
specification. The equipment shall be suitable for remote operation from a
control panel supplied with the transformer as well as for local operation from
the Motor Drive Unit (MDU) mounted on the transformer body.
4.12.2 The mechanism shall be so designed as to ensure that when a tap change
operation is in progress, it shall be able to complete the task independently
irrespective of operation of any relays or switches.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.12.3 Adequate means shall be provided to safeguard the transformer and its
auxiliary circuits from damage should a failure of the auxiliary supply or any
other mal-operation occur during the progress of tap changing that may
prevent it from completing its task.
4.12.4 Means shall be provided in the marshalling kiosk for mechanical isolation of
the supply to the Motor Drive Unit, and a suitable thermal overload device
(details to be submitted with tender) shall be provided in the MDU for the
protection of the motor. The possibility of over-running the mechanism at
each end of the voltage range shall be prevented by means of limit switches
and mechanical stops. Other techniques used to prevent tap changer
runaway shall be indicated.
4.12.5 A mechanically operated device shall be provided to indicate the tap position
locally, and a suitable tap position transmitter shall be provided for the remote
tap position indication.
4.12.6 A counter shall be provided on the tap changing mechanism box to indicate
the total number of operations completed by the equipment.
4.12.7 Contactors and associated equipment for the control circuit for local/remote
and manual operations of the tap changer mechanism shall be housed in the
mechanism box.
4.12.8 The tap changer shall be housed in a separate compartment and shall be
Vacuum Type. Sufficient documentation for the vacuum switch in form of
manuals, instructions, drawings, technical characteristics, copies of type test
certificates and type test reports (from an Independent and ISO/IEC 17025
accredited Testing Laboratory), manufacturing and export experience of the
supplier shall be submitted with the tender for technical evaluation. The tap
changer shall be of a design & make approved by KPLC.
4.12.9 The Motor Drive Unit shall have the following in addition to what has been
stated above:
(a)
Isolating switch in the transformer marshalling box for the supply to the
tap changer Motor Drive Unit,
(b)
Raise/lower contactors for tap changer motor operation, and associated
single-phase protection/overload relay,
(c)
Switch for selection of local/remote tap changer control,
(d)
Switch or switches for local tap changer operation,
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18
Section VI Schedule of Requirements
(e) Provisions shall be made available for hand operation in the mechanism
box.
4.12.10 The tap changer shall be of internationally reputable manufacture and
proven reliability in service. Detailed documentation and copies of
certificates shall be submitted with the tender for evaluation.
4.12.11 Remote Tap Changer Control Panel
The remote tap changer control panel shall contain the following devices:











Automatic Voltage Regulating Relay (to be of KPLC approved design and
technical details shall be submitted with tender).
Off/Manual/Automatic switch for the Relay.
Raise /Lower control switch.
Raise , Lower, ‘out of step’ and tap change in progress indication lamps
Dial type Tap position indicator (technical details to be submitted with the
tender).
Master/Follower/Independent Scheme and selector switch. The Tap
Changer shall employ, negative reactance or circulating current principle
scheme for parallel operation with other three similar transformers but of
different rating.
Local /Remote switch
KV meter (technical details to be submitted with the tender)
Door operated lamp and anti-condensation heater.
Heater switch ON/OFF to control anti-condensation heater
Various control circuits controlled by Miniature Circuit Breakers
4.12.12 AUTOMATIC VOLTAGE REGULATING RELAY
The relay shall be of KPLC approved make & design and shall, as a minimum,
incorporate the following features:
 Rated voltage 110V AC.
 Rated Current 1 Amp.
 Initial time delay range 5-100 seconds, and ability to select Integrated
delay or Definite time delay.
 Inter-tap delay 1-80 seconds
 Relay voltage setting, adjustable in steps of 1V from 85 - 130V
 Line drop compensation 0-20 V at rated current for both reactive and
resistive setting
 Under voltage inhibit range 70%-90% & over current inhibit range 150%250%
 Bandwidth range 0.5-5 % of voltage level
 Over voltage inhibit
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Chapter 4: Technical Specification for Power Transformers
 The AVR should have a selector switch with OFF/Manual/Auto
 Should be of Numeric Design.
 The Relay shall be Designed to employ both Circulating Current
Compensation or Negative(Reverse) Reactance compounding to minimize
circulating current for Parallel Transformer Operation.
 Tap changer Maintenance, by maintaining Tap Operation count.
 Tap Changer Mechanism Failure.
Sufficient documentation in form of price, instruction manuals,
drawings, technical characteristics and test certificates from
international/national testing/standards laboratory of the country of
manufacture shall be submitted with the tender to facilitate technical
evaluation.
4.13. PARALLEL OPERATION
4.13.1 A scheme for operating this transformer in parallel with other similar units of
different rating shall be provided and wired in the marshalling kiosk (box) by
the manufacturer ready for interphasing.
4.13.2 The scheme shall maintain the transformers in stable parallel operation and
limit circulating current to a minimum.
4.13.3 In the event of this transformer being disconnected from the system, its
reconnection shall not result in its tap changer failing to operate automatically
because of tapping discrepancy.
4.13.4 Suitable selector switch shall be provided, so that any one transformer of the
group can at a time be selected as “Master”, “Follower” or “Independent”.
4.13.5 Necessary interlock blocking independent control when the units are in
parallel shall be provided.
4.13.6 The scheme shall be such that only one transformer of a group can be
selected as “Master”.
4.13.7 An out –of- step device shall be provided for each transformer which shall be
arranged to prevent further tapchanging when transformers in a group
operating in “Parallel control” are one tap out-of-step.
4.14.
MARSHALLING KIOSK (Box)
4.14.1 The marshalling kiosk shall be of outdoor, IP 55, weatherproof, verminproof type with a hinged, lockable door fitted with a glass panel to facilitate
reading of oil and winding temperature gauges without opening the door. The
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Section VI Schedule of Requirements
kiosk shall be mounted so that its window is approximately 1600mm above
ground level; and shall accommodate at least the following items:a)
Winding temperature indicator for both HV and MV with a maximum
pointer drag hand type with a resetting knob and three separately
adjustable mercury contacts for alarm, trip and operation of cooler
control circuits as required.
b)
Oil temperature indicator with a maximum pointer drag hand type with
a resetting knob and two separately adjustable mercury contacts for
alarm and trip.
c)
Mechanical isolating switch for the incoming 3 phase, 4 wire, 415V
50Hz supply to the marshalling kiosk. 415 volts and 240 volts socket
outlets (square pins) shall also be provided in the kiosk.
d)
A mechanical isolating switch for the outgoing 3 phase 4-wire 415V
50Hz supply to the OLTC Motor drive unit.
e)
Suitable starters for the cooling fan motors complete with thermal
overload/single phase protection relay and normally-closed electrical
auxiliary contacts for motor failure alarm/trip circuits.
f)
A selector switch with ‘OFF’, ‘HAND’ and AUTO positions for cooling
fan motors
g)
An internal standard screw type illumination lamp and heater for the
kiosk with respective switches. The lamp shall be door switch
operated.
h)
Wiring, fuses, links, terminal boards and cable glands for bottom entry
of multicore cables.
i)
Anti-condensation heater with a switch.
j)
Thermostat for anti-condensation heater control.
k)
Hygrostat for anti-condensation heater control.
l)
MCB control for each of the circuits.
m)
Phase sequence relay for detection of wrong phase rotation for the
supply to the fans and the OLTC Motor Drive Unit.
Detailed technical details, drawings, and schematics shall be submitted with
the tender documents for evaluation.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.15. AUXILIARY SUPPLIES
Equipment shall be rated for the following auxiliary power supplies:
(a)
Cooler control circuits:
240 V, single phase, 50Hz
(b)
Tap changer control:
240 V, single phase, 50Hz
(c)
Cooling fan motors:
415 V, three phase, 50Hz
(d)
Tap changer motor:
415 V, three phase, 50Hz
4.16. TRANSFORMER TANK AND TANK COVER
4.16.1 The tank shall be of top cover design and shall be constructed of mild steel
plates of sufficient thickness and strength and shall be complete with all
accessories. It shall be designed so as to allow the complete transformer
when filled with oil to be lifted by crane or jacks, transported by road, rail or on
water without overstraining any joints and without causing subsequent
leakage of oil. The minimum thickness for sides, bottom and top cover shall
be 8mm, 20mm and 20mm respectively.
4.16.2 The base of the tank shall be so designed that it shall be possible to move the
complete transformer unit in any direction without injury when using rollers,
and/or
plates
4.16.3 The tank and its accessories shall be so designed as to prevent collecting or
trapping of gases. Where this cannot be avoided, pipes shall be provided to
vent the gas into the main expansion pipe. The vent shall have a minimum
outside diameter of 19mm except for short pipes which may be 6.35mm
minimum inside diameter.
4.16.4 All joints, other than those that may have to be broken shall be welded.
Caulking of unsatisfactorily welded joints is forbidden.
4.16.5.The main tank body shall be pressure tested and a certificate issued by the
national standards and testing laboratory ascertaining the soundness of all
welded joints. A certified copy of the certificate shall be submitted with the
tender for evaluation.
4.16.6 Tank shall be provided with lifting lugs suitable for lifting the complete
transformer with oil. Further more, a minimum of four accessible jacking
positions shall be provided to enable the complete transformer to be raised or
lowered using jacks.
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Section VI Schedule of Requirements
4.16.7 The transformer tank and all attachments normally under oil shall be capable
of withstanding full vacuum. The oil conservator shall withstand at least 35%
full Vacuum.
4.16.8 Tank cover shall be of such a design and construction as to prevent
accumulation of water and shall be bolted to the flange on the tank top to form
a weatherproof joint.
4.16.9 Inspection openings shall be provided as necessary to give easy access to
bushings, tapping switch and for testing or general inspection.
4.16.10 Tank cover and inspection covers shall be provided with suitable lifting
arrangements. Inspection covers shall not weigh more than 25 kg apiece.
4.16.11 The tank cover shall be fitted with isolated pockets for oil and winding
temperature instrument bulbs. Protection shall be provided where necessary
for each capillary tube. The pocket shall be fitted with a captive screwed cap
to prevent the ingress of water. Detailed drawings shall be provided.
4.16.12 The pocket shall be located in a position of maximum oil temperature at
continuous
maximum rating and it shall be possible to insert and remove the instrument
bulbs
without lowering the oil in the tank.
4.16.13 Gaskets for weather and oil-tight joint faces shall be of synthetic rubber-andcork
composition and shall have a minimum thickness of 5mm, except that
where
jointing faces are precision-machined thinner gaskets may be used.
4.17. PAINT WORK
Cleaning and painting shall be in accordance with the following
requirements. Any deviations in methodology shall be stated and
may only be those that will produce demonstrably superior results.
A test report issued by the national standards and testing laboratory shall
be produced at the time of acceptance testing of the transformer.
4.17.1 Tanks and Accessories
(a)
External and internal surfaces of all transformer tanks and chambers and
other fabricated steel items shall be cleaned of scale, rust and surface
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Chapter 4: Technical Specification for Power Transformers
dirt by blast cleaning or other suitable approved method. After cleaning,
these surfaces should be immediately covered with paint.
(b)
The exterior shall be thoroughly cleaned by shot blasting or other
approved method and given priming coat followed by two coats of
contrasting colours of durable weather-resisting paint. The final coat
shall be high gloss of shade No. 632 (Admiralty Grey) according to BS
381C.
(c)
The interior of all transformer tanks and other oil-filled chambers shall be
cleaned of all scale and rust by shot blasting or other approved method.
Hot oil resistant varnish on white synthetic enamel paint is to be used for
painting the inside of all oil filled chambers, including transformer tanks
and CT chambers & covers. The final coat shall be of a light-coloured
anti-condensation finish.
4.17.2 Radiators
(a)
Radiators shall be thoroughly degreased and treated externally by
phospating and/or other rust-inhibiting process.
(b)
Radiators shall be flood-painted with a primer and two coats of durable
weather and oil resisting paint. The final external coat shall be high gloss
of shade No. 632 (Admiralty Grey) according to BS 381C. The total
paint thickness shall not be less than 85μm at any point.
4.18. COOLING SYSTEM
4.18.1 Radiators shall be supplied in banks as suitable. Each bank shall be fitted
with gate valves with legible labelling for OPEN/CLOSED positions and used
for full isolation from the main tank. Each radiator shall have a top and
bottom isolating butterfly valve. The radiator design shall exclude
accumulation of rainwater.
4.18.2 Radiator banks shall be mounted directly to the transformer main tank for best
use of space.
4.18.3 Each radiator shall have a bleeding facility (to allow escape of air) on top.
4.18.4 Separately mounted a-c motor driven fans fitted with wire mesh guards shall
be provided for the radiators.
The fan motors shall be totally enclosed,
weatherproof, outdoor type suitable for continuous operation and shall be
fitted with terminal boxes and glands to accommodate multicore electric
supply cables. Technical details of the fan motor shall be supplied with the
tender.
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Section VI Schedule of Requirements
4.18.5 Suitable starters, protection/warning devices, contactors and switches for the
motors shall be provided as stipulated in clause 4.14 above.
4.18.6 Suitable lifting lugs shall be provided for removal and assembly of radiators.
4.18.7 The complete cooling system and the fittings shall be fully co-ordinated.
Where necessary, the cooling fan motors shall be fired in designed groups
and in such sequence as to achieve the desired control at maximum
efficiency and safety.
4.19. FITTINGS
4.19.1 Conservator
The transformer shall be provided with a conservator having a filling
orifice, an isolating valve, a drain valve and a cobalt free
dehydrating breather (with oil seal) which shall be accessible from
ground level. The drain pipe shall be located at the lowest point in
the conservator in its final installed position and welded such that it
can drain all the sludge in the conservator.
The conservator shall be partitioned proportionately to separate the main
tank oil and the tapchanger oil. Each compartment to be fitted with
a breather and an oil level indicator with electrical contacts for
alarms. The conservator complete with drain valve shall be in such
a position as not to obstruct the electrical connections to the
transformer. An oil gauge shall be provided at one end of the
conservator marked with oil levels that can be read by a person
standing on the ground. Expansion joints may be provided in the
inlet and outlet pipes to the transformer as necessary.
4.19.2 Gas and Oil Actuated Relay (Transformer main tank)
Transformers shall be provided with a gas and oil actuated relay (Buchholz
relay) of double float type with tripping contacts to detect accumulation of gas
and sudden changes of oil pressure. Shut off valves and flange couplings
shall be provided to facilitate easy removal of the relay without lowering oil
level in the main tank. A bleed valve for gas venting, a test valve and a
terminal box suitably wired to the marshalling kiosk shall also be provided.
The gas venting pipe shall be brought down to a height reachable from
ground level and shall be fitted with a gas sampling device at the end.
Provision should be made on the relay for simulation of gas and oil surge for
testing purposes.
4.19.3 Gas and Oil Actuated Relay (Tap changer compartment)
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Chapter 4: Technical Specification for Power Transformers
Tap changer compartment shall be provided with a gas and oil actuated relay
(Buchholz relay) of double float type with tripping contacts to detect
accumulation of gas and sudden changes of oil pressure. Shut off valves and
flange couplings shall be provided to facilitate easy removal of the relay
without lowering oil level in the tap changer compartment. A bleed valve for
gas venting, a test valve and a terminal box suitably wired to the marshalling
kiosk shall also be provided. The gas venting pipe shall be brought down to a
height reachable from ground level and shall be fitted with a gas sampling
device at the end. Provision should be made on the relay for simulation of gas
and oil surge for testing purposes.
4.19.3 Pressure Relief Device
A pressure relief device shall be provided for the main tank, complete with trip
contacts suitably wired to the marshalling kiosk. The device shall be
resettable after an operation. Details of the device shall be submitted with the
offer.
4.19.4 Winding Temperature Indicator
(a)
The transformer shall be provided with winding temperature indicator,
maximum indicator and associated current transformers. The
temperature indicator shall have a scale ranging from 20°C to 150°C,
preferably uniformly divided and its type to be stated in the bid. The
indicator shall have two sets of independently adjustable contacts as
follows:
(i) Alarm
Adjustable setting: 70°C to 150°C
Fixed differential: Not more than 10°C
(ii) Trip
Adjustable setting: 70° to 150°C
Fixed differential:
Not more than 10°C
(b)
All contacts shall be adjustable to a scale and shall be accessible on
removal of the cover for dial type devices. For purposes of (i) and (ii)
above, the contacts shall be suitable for making or breaking 150VA
between the limits of 30 and 250 V a.c. or d.c., and making 500 VA
between the limits of the 110 and 250 V d.c.
(c)
Isolating and test links shall be provided in a control cubicle to allow for
measuring the oil temperature and testing the heater coil.
(d)
The current transformer providing winding temperature indication shall
be located at the discretion of the manufacturer, in the best position for
the duty.
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Section VI Schedule of Requirements
(e)
Calibration of indicator shall be related to the winding having the
maximum temperature rise.
(f)
If the value on the winding temperature indicator varies by more than
3°C from the values derived from the tests specified in clause 5, then
adjustments shall be made to the equipment to achieve these limits.
4.19.5 Oil Temperature Indicator
Transformers shall be provided with an oil temperature indicator with a
maximum pointer and contacts for alarm and trip signals, similar to
winding temperature indicator above.
4.20. ACCESSORIES
The following shall be provided:
4.20.1 Valves with blank flanges fitted at the top and bottom for oil filtration
purposes, having the following features:
(a)
The valve located at the bottom of the tank shall also be suitable for
draining oil from the transformer tank.
(b)
All valves shall close with a clockwise rotation. The main inlet and outlet
valves shall be provided with “open” and “closed” position indicators,
visible from ground level.
(c)
All valves shall have provision for padlocking in the open and closed
position for operation purposes. The hole for the padlock shall have a
clearance of not less than 8mm and not more than 10mm. Locking pin
shall be of anti-rattle design to limit noise emissions. The locking
padlocks shall be provided.
(d)
Closed/Open positions of all valves must be clearly marked.
4.20.2 Oil sampling device appropriately located to obtain samples of transformer oil
from the top and bottom of the tank.
4.20.3 Two earthing terminals located at diagonally opposite corners of the tank.
4.20.4 Air release valves or plugs for the main tank, suitably located.
4.20.5 Non-deteriorating detailed diagram and rating plates.
4.20.6 Other Fittings/accessories
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Diagram plate
Plate of valves and oil piping.
Motor drive electrical and protection diagram.
Cooling control electrical and protection diagram.
Electrical scheme for operating this in parallel with other similar units.
Detailed list of the transformer equipment & fittings including their drawings,
brochures & instruction manuals.
Shipping data
Detailed erection, installation, operation and maintenance manuals in English
language.
Testing Plan.
Impact recorder for the whole duration of transit and a report provided
afterwards.
2 Sets of keys for padlocking devices.
(all control boxes as well as valves to be padlocked)
4.21. TRANSFORMER OIL
The transformer and all associated oil immersed equipment shall be supplied oil
filled. The oil shall comply with all the requirements of IEC 60296 (class 1: uninhibited oil). Tenderer shall provide the chemical composition and properties of the
oil and the replacement cycle over the expected life of the transformer.
4.22. CAPITALIZATION
4.22.1 Transformer losses shall be capitalized at the following rates to facilitate
evaluation and comparison of tenders.
Total load losses, ONAF rating (copper loss
+ stray loss) at rated current at 750 C in
KW, including auxiliary losses
Total no load losses in KW (core loss +
dielectric loss)
US$ 1070/kW
US$ 4300
Losses will be capitalized at the above rates and added to the bid price
according to the formula below:
Gep = Gbp + G($), where Gep = Bid evaluation price, Gbp = Bid price
and
G($) = Adjustment for the cost of the operation
G($) is obtained by using the following formula:
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Section VI Schedule of Requirements
G($) = US$ 1070 X {Total load losses, ONAF rating (copper loss + stray
loss) at rated current at 750 C in KW, including auxiliary losses} + US$ 4300
X {Total no load losses in KW (core loss + dielectric loss)}.
4.22.2 The guaranteed transformer losses used in the above capitalization formula
shall be the maximum allowed and no plus tolerance shall be allowed during
acceptance testing.
4.23. QUALITY MANAGEMENT SYSTEM
4.23.1 The bidder shall submit a quality assurance programme (QAP) that will be
used to ensure that the transformer design, material, workmanship, tests,
service capability, maintenance and documentation, will fulfil the requirements
stated in the contract documents, standards, specifications and regulations.
The QAP shall be based on and include relevant parts to fulfil the
requirements of ISO 9001:2008.
4.23.2 The Manufacturer’s Declaration of Conformity to reference standards and
copies of quality management certifications including copy of valid and
relevant ISO 9001: 2008 certificate shall be submitted with the tender for
evaluation.
4.23.3 The bidder shall indicate the delivery time of each type of transformer,
manufacturer’s monthly & annual production capacity and experience in the
production of the type and size of transformer being offered. A detailed list &
contact addresses (including e-mail) of the manufacturer’s previous
customers outside the country of manufacture for exact or similar rating of
transformers sold in the last five years shall be submitted with the tender for
evaluation.
5.
TESTS AND INSPECTION
5.1 The transformer shall be inspected and tested in accordance with the
requirements of IEC 60076 and this specification. It shall be the responsibility of
the manufacturer to perform or to have performed all the tests specified.
Tenderers shall confirm the manufacturer’s capabilities in this regard when
submitting tenders. Any limitations shall be clearly specified.
5.2 Copies of Type Test Certificates and Type Test Reports issued by the relevant
Independent International or National Testing/ Standards Authority of country of
manufacture or ISO/IEC 17025 accredited and independent testing laboratory
shall be submitted with the offer for evaluation (all in English Language). A copy
of the accreditation certificate for the independent laboratory shall also be
submitted. Any translations of certificates and test reports into English language
shall be signed and stamped by the Testing Authority.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
1) Copies of type test certificates and type test reports for the transformer to
be submitted for tender evaluation shall include:
a) Dielectric tests to IEC 60076 (Lightning Impulse and Power Frequency
Withstand Tests).
b) Short circuit withstand test to IEC 60076.
 thermal ability of the transformer to withstand short circuit,
 ability of the transformer to withstand the dynamic effects of short
circuit
c) Temperature rise test to IEC 60076.
Note: Temperature rise test to IEC 60076 if conducted at the manufacturer’s
premises (factory) MUST be in the presence of representatives of ISO/IEC
17025 accredited and independent testing laboratory; who shall sign the
certificates and test reports.
2) Copies of type test certificates and type test reports for the on load tap
changer to be submitted for tender evaluation shall include:
a) Dielectric tests (Lightning Impulse and Power Frequency Withstand
Tests).
b) Short circuit withstand test.
c) Temperature rise test.
d) Switching tests.
e) Transition impedance test.
f) Mechanical tests.
5.3 The transformer shall be subject to acceptance tests at the manufactures’ works
before dispatch. Acceptance tests shall be witnessed by two Engineers
appointed by The Kenya Power and Lighting Company Limited (KPLC) and shall
include the following:
5.3.1 Routine tests to IEC 60076 (to be done during acceptance testing at
factory)

Measurement of winding resistance

Ratio test

Vector group

Separate source voltage withstand test

Induced over-voltage

Insulation resistance

Oil leakage test on fully assembled transformer for 12 hours

Measurement of impedance voltage
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Section VI Schedule of Requirements

Magnetic balance

Measurement of no-load loss and current

Measurement of load loss (at normal & extreme taps)

Tests on on-load tap-changer

Tests on on-load tap-changer remote control panel

Efficiency at 50%, 75%, 100% loading at unity p.f and rated terminal
voltage (Corrected to 75C)

Lightning impulse withstand test
5.3.2 Type Tests to IEC 60076 (to be done during acceptance testing at
factory)

Temperature rise test – To be performed on one unit during acceptance
testing.
Note: Lightning Impulse Withstand Test is required and is already listed under
5.3.1 Routine Tests as per IEC 60076.
5.3.3 Additional tests (to be done during acceptance testing at factory)













5.4
Visual Inspection (verification of auxiliaries, fittings & accessories,
markings & nameplates, paintwork, workmanship and finish)
Measurement of power taken by the fans
Insulation dissipation factor
Condenser bushing capacitance and tan delta
DGA (dissolved gas analysis) of the insulating oil.- To be performed
before and after temperature rise test
Acoustic and sound level
Insulation tests on the auxiliary wiring in the marshalling boxes
Measurement of zero sequence impedance
Measurement of harmonics no-load current
CT ratio and polarity
Measurement of zero phase sequence impedance
Paint thickness
Tank pressure test
Testing Facility
5.4.1 The bidder shall provide current e-mail address, fax and telephone numbers
and contact person at the Testing Authority where Type Tests and Special
Tests to IEC 60076 were carried out.
5.4.2
All test and measuring equipment to be used during acceptance testing shall
have been calibrated and copies of valid calibration certificates shall be
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
provided to KPLC Engineers. A detailed list of workshop tools, test/measuring
equipment and list of tests to IEC 60076 that can be carried out by the
manufacturer shall be submitted with the tender for evaluation.
5.5 Test reports for each transformer (including its individual components) shall be
submitted to The Kenya Power and Lighting Company for approval before
shipment.
5.6 On receipt of the transformer, KPLC will inspect it and may perform or have
performed any of the relevant tests in order to verify compliance with the
specification. The manufacturer shall replace/rectify without charge to KPLC,
equipment which upon examination, test or use fail to meet any or all of the
requirements in the specification.
6.
MARKING, LABELLING AND PACKING
6.1
The transformer and associated components shall be packed in a manner as
to protect it from any damage in transportation and handling. It shall be
dispatched oil-filled and fully wired. All piping shall follow the contour of the
transformer as closely as possible to avoid damage during transportation and
handling. Auxilliary equipment and accessories/fittings shall be protected
against mechanical damage and oil vandalism.
6.2
Each assembly and package of items associated with the transformer shall be
suitably marked for ease of identification.
6.3
In addition to markings and labels required elsewhere in the tender &
specification, each equipment and component shall be marked in accordance
with the relevant IEC standard. Each transformer shall be provided with a
rating plate of weatherproof material, fitted in a visible position, showing the
appropriate details listed in IEC 60076. The entries on the plate shall be
indelibly marked (either by etching, engraving or stamping).
6.4
In addition, the name plate shall include load and no load losses for the
highest, lowest and principle tap positions, temperature class of insulation,
connection diagram and the inscription 'PROPERTY OF THE KENYA
POWER AND LIGHTING CO.' all marked indelibly as in 6.4.
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Section VI Schedule of Requirements
Annex A
SCHEDULE OF GUARANTEED TECHNICAL
TRANSFORMER OFFERED
No.
Requirements
1.
Name of the manufacturer and country of
origin
2.
Conforming to standard
3.
Service (indoor/outdoor), altitude,
temperature range, humidity and
environment (pollution severity level)
4
Rating
a)
1. With ONAN cooling, MVA
2. With ONAF cooling, MVA
b)
Rated no load voltage
HV-kV
LV-kV
5.
Temperature rise of top oil (deg.C)
6.
Temperature rise of winding measured by
resistance.
7.
i)
With ONAN cooling (deg. C)
ii)
With ONAF cooling (deg. C)
iii)
load
Period of operation of transformer at full
without calculated winding hot spot
temperature exceeding 140C and with
a. 50% coolers off
b. 100% coolers off
Rated frequency (Hz)
8.
No. of windings
9.
Number of phases
10.
Connection symbol & vector group
11.
Tappings:
i)
ii)
Type of tap changer
Tap step (percent)
PARTICULARS
FOR
BIDDER’S OFFER
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
iii)
Total tap ranges - (+) percent to (-)
percent
iv)
12.
Tappings provided at
required)
(HV-N
Magnetization data at no load, at 90%
rating, at 100% rating and at 110% rated
voltage and load and frequency
i) Current in Amps
ii) Power factor
iii) Total no load losses in KW (core loss +
dielectric loss)
13.
Total load losses (copper loss + stray loss)
at rated current at 750 C in KW
i)
For ONAN Rating
ii) For ONAF Rating (including
auxiliary losses)
iii) Auxiliary Losses
14.
% impedance voltage at rated current and
frequency at 750 C.
i) Positive sequence at normal tap in %
ii) Positive sequence at Max. Voltage tap in
%
iii) Positive sequence at Min. voltage tap in
%
iv) Minimum short-circuit apparent power
v) symmetrical short circuit current
15.
16.
Reactance per phase at rated frequency at
normal tap on rated MVA base: HV to LV - %
Resistance at 750 C of:
HV Winding in ohms (at principle & extreme
taps)
LV Winding in ohms
17.
Efficiency at 750 C taking in to account input of
cooling plant loss:
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Section VI Schedule of Requirements
At Unity Power Factor and at 0.8 Power
Factor Lagging:
i) At 125% full load
ii) At 100% full load
iii) At 75% full load
iv) At 50% full load
18.
Regulation at full load & at 750 C
i)
ii)
19.
At unity p.f. in %
At 0.8 p.f. (lag) in %
a) Short time thermal rating of HV winding
in kA
and duration in seconds
b) Short time Thermal rating of LV winding
in kA
& duration in seconds
20.
a) Overload capacity for 2 hours after
continuous
full load run
b) Thermal time constant in hours
21.
a)
Test Voltages at factory:
i) Lightning impulse kV (peak)
ii) Power frequency voltage withstand kV
(rms)
ii) Altitude of factory
b) Voltage to earth for which star point will
be insulated.
i)
ii)
Impulse kV (Peak)
Power frequency (kV)
22.
Noise level when energized at normal
voltage and normal frequency at no load.
23.
Approximate weights
i)
Core (kg)
ii) Windings (kg) (Copper + Insulation)
(separately)
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Chapter 4: Technical Specification for Power Transformers
iii)
Tank & Fittings (kg)
iv)
v)
Oil (kg)
Total weight (kg)
24.
Details of oil and quantity in liters
25.
Net core area in sq. meters
26.
Type of transformer (stacked core type
required)
27.
Material of Laminations
28.
i.
Grade of CRGO
ii.
Thickness of lamination
iii.
Stack-factor
iv.
Specific weight/m3
v.
Specific loss watts/kg.
Maximum flux density at rated voltage and
frequency in Tesla/lines/cm2
Conductor area in sq. cm. and current
density in Amps/Sq. cm.
29.
HV
LV
Regulation winding.
Type of windings
30.
HV
LV
31.
Winding insulation type and class, graded
or ungraded
HV
LV
32.
a) Insulating material
i)
Turn insulation
ii)
HV side
iii)
LV side
b) Between HV and LV as applicable.
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36
Section VI Schedule of Requirements
c) For core bolts, washers and end plates
d) Tapping connection
33.
i)
Type of axial support:HV winding
LV winding
ii)
34.
Type of Radial Coil support :HV winding
LV winding
Clearances in air
Phase to phase HV - HV
HV - LV
LV - LV
Phase to earth
HV - E
LV - E
35.
Details of Tank
i)
ii)
iii)
37.
Type of the tank
Thickness of sides in mm
iv)
Thickness of Bottom in mm
v)
Thickness of Cover in mm
vi)
36.
Material for tank
Thickness of Radiators in mm
Shipping details – List parts normally detached
for transport and indicate protection against
mechanical damage and oil vandals for entire
transformer
Details of Bushings (indicate details for
each)
i)
Type
ii)
One minute dry withstand
frequency voltage kV (rms)
iii)
One minute wet withstand power
frequency voltage kV (rms)
power
iv)
1.2/50s lightning impulse voltage, dry
(kVp)
HV LV
NEUTRAL
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
38.
v)
Total creepage distance in Air (mm)
vi)
Weight of bushings (kg)
vii)
Phase to earth clearance in air of live
parts at the top of bushings.
viii)
Maximum current rating of each bushing
ix)
Quantity of oil in the bushings in liters
On load tap changer (OLTC)
i)
Manufacturer and Type & Model No.
ii)
Rating
iii)
Rated voltage
kV
iv)
Rated current
Amps
v)
Step voltage
kV
vi)
No. of steps
No.
vii)
Approximate over all dimensions (Width
x Breadth x Depth) in mm
viii)
Approximate overall weight in kg.
ix)
Time to complete one tap change step
in seconds
x) List technical documents including type test
certificates and type test reports,
manufacturing experience, sales records,
installation instructions and manuals and
manufacturer’s authorization submitted for
the OLTC offered.
39.
Cooling System:
i)
Grade of oil
ii) Quantity of oil in Transformer
iii) Weight of oil in Transformer
in litres
in litres
iv) Type and make of material used for
radiators.
v) Total radiating surface
in m2
vii) No. of tubes/fins & copulate dimensions
thereof.
viii) Total weight of Radiators in kg.
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38
Section VI Schedule of Requirements
40.
Cooling Equipment : Fan motor
i)
ii)
iv)
Make and Type (Details)
Number connected --(No.)
Nos. in standby --(No.)
Rated power ---
v)
Rated Voltage
vi)
Temp. at which control is adjustable
vii)
Capacity in Litres/Minute
iii)
41.
(kW)
Overall dimensions of transformer including
cooling gear, tap changing gear etc.
a)
Length mm
b)
Breadth mm
c)
Height mm
d)
Reference drawing No.
42.
Type and size of oil temperature indicator.
43.
Type of oil level indicator.
44.
Type and size of Gas operated relay.
Type & size of winding temperature indicators.
45.
47.
Ratio and Type of CT used for winding
temperature indicator
Capacity of conservator vessel (Litres)
48.
Type of oil preservative installed
49.
Valve sizes and Numbers required/fitted
46.
50.
51.
i)
drain valves -mm- No.
ii)
filter valves -mm- No.
iii)
sampling valves -mm- No.
Size of Rail gauge for installation in yard
a)
Longer axis
b)
Shorter axis
a)
Type and make of pressure relief device
b)
Minimum pressure at which the device
operates (kPa)
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
52.
53.
Make & size of silica-gel breaker.
Manufacturer’s Guarantee and Warranty
54.
List catalogues, brochures, technical data,
drawings submitted to support the offer.
55.
Detailed list & contact addresses of the
manufacturer’s previous customers outside the
country of manufacture for exact or similar rating of
transformers sold in the last five years submitted to
support the offer.
List Type Test Certificates and Type Test Reports
submitted with tender (indicate test report numbers,
date, Independent Testing Institution and contact
addresses)
a) Dielectric tests to IEC 60076 (Lightning Impulse
and Power Frequency Withstand Tests).
b) Short circuit withstand test to IEC 60076.
 thermal ability of the transformer to
withstand short circuit,
 ability of the transformer to withstand the
dynamic effects of short circuit.
56.
57.
c) Temperature rise test to IEC 60076.
Note: Temperature rise test to IEC 60076 if
conducted at the manufacturer’s premises
(factory) MUST be in the presence of
representatives of ISO/IEC 17025 accredited
and independent testing laboratory; who shall
sign the certificates and test reports.
Testing facility (of Detailed
list
of
the manufacturer) manufacturer’s
workshop
tools, test and measuring
equipment
List of tests to IEC 60076
that can be carried out by
the manufacturer
59.
List Acceptance Tests to be
witnessed by KPLC Engineers
at the factory
List test reports (for transformer and components)
to be submitted to KPLC for approval before
shipment
Copy of ISO 9001:2008 Certificate submitted
60.
Quality Assurance Programme
61.
Manufacturer’s Declaration of Conformity to
Standards (including IEC 60076)
Deviations from tender specifications and
58.
62.
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40
Section VI Schedule of Requirements
64.
supporting data, test reports, technical documents
etc.
Inspection of the transformer and components at
KPLC stores/site.
List and details of current transformers to be fitted
65.
Aauxiliaries, fittings and accessories to be fitted.
63.
…………………………………………………………………………………………
….
Manufacturer’s Name, Signature, Stamp and Date
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Technical specifications for 66KV/11KV Transformer
FOREWORD
7.
SCOPE
8.
REFERENCES
9.
TERMS AND DEFINITIONS
10.
REQUIREMENTS
11.
TESTS AND INSPECTION
12.
MARKING, LABELLING AND PACKING
ANNEX A:
Guaranteed Technical Particulars (to be filled and signed by the
Manufacturer and submitted together with copies of manufacturer’s
catalogues, brochures, drawings, technical data, sales records and
copies of type test certificates and type test reports for tender
evaluation)
Page 41Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
42
7.
Section VI Schedule of Requirements
SCOPE
This specification is for newly manufactured outdoor oil type power
transformer as described below:
23MVA, 66000/11000 volts, 50 Hz, ONAN/ONAF three phase power
transformer (the Vector Group shall be stated on the schedule of
requirements in the tender).
The specification also covers inspection and test of the transformer as well as
schedule of Guaranteed Technical Particulars to be filled, signed by the
manufacturer and submitted for tender evaluation.
The specification stipulates the minimum requirements for 23MVA 66kV/11kV
power transformer acceptable for use in the company and it shall be the
responsibility of the Manufacturer to ensure adequacy of the design, good
workmanship and good engineering practice in the manufacture of the
transformer for KPLC.
The specification does not purport to include all the necessary provisions of a
contract.
8.
REFERENCES
The following standards contain provisions which, through reference in
this text constitute provisions of this specification. Unless otherwise
stated, the latest editions (including amendments) apply.
ISO 1461:
IEC 60076:
Hot dip galvanized coatings on fabricated iron and steel articles
– Specifications and test methods.
Power transformers.
IEC 60044: Instrument transformers.
IEC 60296: Specification for unused mineral insulating oil for transformers
and switchgear.
IEC 60354:
Loading guide for oil – immersed power transformers.
IEC 60214: Tap-changers - Part 1: Performance requirements and test
methods, Part 2: Application guide.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
IEC 60512:
Connectors for electronic equipment
BS 171: Power transformers
BS 381C:
purposes
Specification for colours for identification coding and special
9.
TERMS AND DEFINITIONS
3.1
The terms and definitions given in the reference standards shall apply.
3.2
The term similar rating where used in this specification shall be for
transformer ratings within the range 23MVA – 100MVA and primary voltage
rating of 66kV – 220kV and secondary voltage of 11kV – 33kV.
10.
REQUIREMENTS
4.11
Service Conditions
4.1.3 Operating conditions
The transformer shall be suitable for continuous outdoor operation in
tropical areas with the following conditions.
(f)
Altitude:
Up to 2200 metres above sea level.
(g)
ºC
Temperature: average of +30ºC with a minimum of -1ºC and max +40
(h)
Humidity:
up to 95%,
(i)
Pollution:
Design pollution level to be taken as “Heavy” (Pollution
level III, minimum specific creepage distance: 25mm/kV )
according to IEC 60815.
(j)
Isokeraunic level: 180 thunderstorm days per year
4.1.4 System characteristics
d) The primary HV system is 66,000 volts, 3 phase, 3 wire, 50Hz.
e) The secondary MV system is 11,000 volts, 3 phase, 3 wire, 50Hz, with
neutral point solidly earthed.
f) The Transformer shall be operated at a high loading factor.
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44
4.12
Section VI Schedule of Requirements
General Requirements
4.12.1 The transformer shall be outdoor, oil-immersed, of ONAN/ONAF
classification and core type (lamination stackings). All offers shall comply with
the requirements of IEC 60076. Any deviations/additional requirements shall
be as stated in this specification.
4.12.2 The transformer shall be a three-phase integral unit.
4.12.3 The transformer shall be of the free breathing type. A dehydrating cobalt free
breather of approved design shall be provided.
4.12.4 The transformer and accessories shall be designed to facilitate operation,
inspection, maintenance and repairs. All apparatus shall be designed to
ensure satisfactory operation under such sudden variations of load and
voltage as may be met with under working conditions on the system, including
those due to short circuits.
4.12.5 The design shall incorporate every reasonable precaution and provision for
the safety of all those concerned in the operation and maintenance of the
equipment keeping in view the regulatory requirements in Kenya.
4.12.6 All material used shall be new and of the best quality and of the class most
suitable for working under the conditions specified in clause 4.1 and shall
withstand the variations of temperatures and atmospheric conditions arising
under working conditions without undue distortion or deterioration or the
setting up of undue stresses in any part, and also without affecting the
strength and suitability of the various parts for the work which they have to
perform.
4.12.7 Corresponding parts liable to be replaced shall be interchangeable.
4.12.8 All outdoor apparatus, including bushings insulators with their mountings,
shall be designed so as to avoid pockets in which water can collect.
4.12.9 All connections and contacts shall be of ample section and surface for
carrying continuously the specified currents without undue heating and fixed
connections shall be secured by bolts or set screws of ample size, adequately
locked. Lock nuts shall be used on stud connections carrying current. All
leads from the winding to the terminals and bushings shall be adequately
supported to prevent injury from vibration including a systematical pull under
short circuit conditions.
4.12.10
All apparatus shall be designed to minimize the risk or accidental
short-circuit caused by animals, birds or vermin.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.12.11
In tank on-load-tap changers shall be located such that the space
above the diverter switch chamber will be free of inter-connecting pipes etc.
for lifting the diverter switch unit for inspection and maintenance purposes.
4.12.12
Galvanizing shall be applied by the hot-dipped process to ISO 1461
and for all parts other than steel wires shall consist of a thickness of zinc
coating equivalent to not less than 610g of zinc per square meter of surface.
The zinc coating shall be smooth, clean and of uniform thickness and free
from defects. The preparation of galvanizing and the galvanizing itself shall
not adversely affect the mechanical properties of the coated material. The
quality will be established by tests as per ISO 1461.
4.12.13
All bolts, nuts, and washers exposed to atmosphere and in contact with
non-ferrous parts which carry current shall be of phosphor bronze.
4.12.14
If bolts and nuts are placed so that they are inaccessible by means of
ordinary spanners, suitable special spanners shall be provided by the
supplier.
4.12.15
Except for hardware, which may have to be removed at site, all
external surfaces shall receive at least four coats of paint. The total dry film
thickness shall be between 100 and 130 microns.
4.12.16
Descriptive labels for mounting indoors or inside cubicles and kiosks
shall be of material that will ensure permanence of the lettering. A matt or
satin finish shall be provided to avoid dazzle from reflected light. Labels
mounted on dark surface shall have white lettering on a black background.
Danger notices shall have red lettering on a white background.
4.12.17
All interior surfaces of chambers or kiosks that are in contact with air
shall receive at least three coats of paint, of which the topcoat shall be of a
light shade.
4.12.18
The design and all materials and processes used in the manufacture of
the transformer, shall be such as to reduce to a minimum the risk of the
development of acidity in the oil.
4.12.19
Every care shall be taken to ensure that the design and manufacture of
the transformers and auxiliary plant shall be such to have minimum noise and
vibration levels following good modern manufacturing practices. The
maximum noise levels shall be stated in the bid.
4.13
Ratings
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46
Section VI Schedule of Requirements
4.3.1 (a) The windings of the transformer shall be rated at 23MVA (ONAF), with a
minimum ONAN rating of 18 MVA. These ratings shall be for the operating
conditions stated in clause 4.1.
(b) The rating specified in this clause shall be the continuous rating at
the maximum ambient temperature and altitude given in clause 4.1.
4.3.2 (a) The transformer shall be capable of carrying its full normal rating
continuously at any tap under the conditions stated in clause 4.3.1 without
undue stress, overheating, or the temperature rise in the hottest region
exceeding 55ºC and 60ºC in oil and windings respectively.
(b) The loading capabilities shall be demonstrated by a temperature – rise
test. This test shall be done in the presence of KPLC Representatives during
factory visit.
4.3.3 The transformer shall be capable of withstanding the fault level at its rated
voltage and impedance for 2 seconds. The design should cater for the
expected lifetime of the transformer.
4.3.4 The thermal ability to withstand short circuit shall be demonstrated by
calculation as per IEC 60076-5 and the calculation shall be submitted with the
tender. The duration of the current to be used for the calculation of the
thermal ability to withstand short circuit shall be 2 seconds while the
maximum permissible value of the average temperature of each winding shall
be as per IEC 60076-5.
4.3.5 The ability of the transformer to withstand the dynamic effects of short circuit
shall
be demonstrated by tests and complete test reports (including oscillograms
and records of the condition of the transformer before and after the shortcircuit test) shall be submitted for tender evaluation.
4.14
Winding and Connections
4.4.14 The VECTOR GROUP shall be Dyn1 unless otherwise stated on the
schedule of requirements in the tender.
4.4.15 The transformers shall be capable of operation without danger on any
particular tapping at the rated MVA when the voltage may vary by ± 10% of
the voltage corresponding to the tapping.
4.4.16 The windings and connections as well as the insulating material shall not
soften, ooze, shrink or collapse during service. The materials shall be noncatalytic and chemically inactive in transformer oil during service.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.4.17 No strip conductor wound on edge shall have a width exceeding six times its
thickness. The conductors shall be transposed at sufficient intervals to
minimize eddy currents and equalize the current and temperature distribution
along the windings.
4.4.18 The windings and connections shall be properly braced to withstand shocks
during transportation or due to short circuit and other transient conditions
during service.
4.4.19 Adequate pre-shrinkage of the coil assembly using pre-compressed press
board material having low moisture content for the radial spacer blocks shall
be ensured by the manufacturers so that there is no displacement of the
radial spacer blocks due to frequent short circuits on the transformers.
4.4.20 All windings after being wound and all fibrous hygroscopic materials used in
the construction of the transformer shall be dried under vacuum and
impregnated with hot oil.
4.4.21 The coil clamping rings wherever used shall preferably be of flat insulated
steel laminations.
4.4.22 The radial spacer blocks must be made of pre-compressed pressboard
material, which will not soften while in contact with oil or fray out into fibers or
edges. The slots should be so dimensioned that the blocks will not come out
of the slots.
4.4.23 All joints shall be brazed/crimped considering the vibrations due to short
circuits and load fluctuations.
4.4.24 KPLC will inspect built-up winding for its quality, weight of copper, insulation
and overall weight of coil assembly. The size of conductor used for different
windings shall also be checked during stage inspection to check the current
density.
4.4.25 The transformer shall be designed with particular attention to the suppression
of harmonic voltage, especially the third and fifth, so as to eliminate waveform distortion and from any possibility of high frequency disturbances,
inductive effects or of circulating currents between the neutral points at
different transforming stations reaching such a magnitude as to cause
interference with communication circuits.
4.4.26 The windings shall be designed to reduce to a minimum the out-of-balance
forces in the transformer at all voltage ratios.
4.15
Tapping
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48
Section VI Schedule of Requirements
4.5.1 Tapping Range
The transformer shall be provided with tapping on the 66 kV winding for a
variation of no load primary voltage for parallel operation, with Tap No. 1
having the highest voltage assignment, as follows:
66,000 volts + 8  1.67%
- 8  1.67%
4.5.2. Tapping Method
Tapping shall be carried out by means of an on-load tap changer as
described in clause 4.12 below.
4.16
Core and Flux Density
a) Core
4.16.1 The core shall be constructed from the laminations of high grade cold rolled
non-aging, grain oriented silicon steel known as M4 or superior grade CRGO
steels of maximum 0.27mm or less lamination thickness especially suitable
for transformer core. The grade of CRGO shall be stated in the bid.
4.16.2 The design of the magnetic circuit shall be such as to avoid static discharges,
development of short-circuit paths within itself or to the earthed or to the
clamping structure and the production of flux components at right angles to
the plane of the laminations which may cause local heating.
4.16.3 Every care shall be exercised in the selection, treatment and handling of core
steel to ensure that as far is practicable, the laminations are flat and the finally
assembled core is free from distortion.
4.16.4 Adequate oil ducts shall be provided in the core for cooling. Tinned copper
strip bridging pieces shall be used for maintaining electrical continuity
wherever the magnetic circuit is provided into pockets by such ducts or
insulating material thicker than 0.25mm.
4.16.5 There shall be no movement of the core assembly relative to the tank during
transport, installation as well as in service due to sudden jerks caused by
short circuits and fluctuating loads.
4.16.6 All steel sections used for supporting the core shall be thoroughly sand
blasted or shot blasted after cutting, drilling and welding. Any non-magnetic or
high resistance alloy shall be of established quality.
4.16.7 Adequate lifting lugs shall be provided to enable core and winding to be lifted.
4.16.8 The supporting framework of the Cores shall be so designed as to avoid the
presence of pockets which would prevent complete emptying of the tank
through the drain valve, or cause trapping of air during filling.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.16.9 The insulation structure for the core to bolts and core to clamp plate shall be
such as to withstand a voltage of at least 2kV AC for one minute.
(b) Flux Density
4.16.10
The primary voltage variation, which may affect the flux density at
every tap, shall be kept in view while designing the transformer.
4.16.11
The transformer shall be so designed that the working flux density shall
not exceed 1.6 Tesla at normal voltage, frequency & ratio. Tenders with
higher flux density than specified shall not be considered.
4.16.12
Tenderers shall indicate the continuous allowable maximum flux for
one minute and five seconds.
4.16.13
The limit of flux density at which core material used saturates shall
also be stated in the tender. The name and grade of core material shall be
stated in the tender.
4.16.14
The successful tenderer shall be required to furnish magnetization
curve of the core material, design calculations and such other
data/documents deemed fit by the purchaser for being satisfied that flux
density is as desired.
NOTE: The above flux density has been specified to meet with the over
fluxing of the core due to temporary over voltage of the orders of 25%
for one minute and 40% for five seconds that may appear in abnormal
conditions such as the one obtained following sudden loss of large
loads.
4.17
Losses, Regulation and Impendence
4.7.1 Losses of the transformer shall be stated and shall be subject to tolerances in
accordance with IEC 60076. The fixed losses shall be as low as is consistent
with good design, reliability and economical use of materials.
4.7.5 Voltage regulation from no-load to continuous rated output at unity power
factor, at 0.8 lagging and 0.8 leading power factor with constant voltage
across the higher voltage windings shall be stated in the bid.
4.7.6 The impedance voltage at extreme tappings and at principal tapping shall be
stated and shall be subject to tolerances in accordance with IEC 60076.
Typical values for existing transformers in KPLC at principal (nominal) tap are
9.8% - 10.1%. The minimum as per IEC 60076-5 for this size of transformer is
8.0%.
4.7.7 As a minimum, the short-circuit apparent power of the system shall be taken
as 3,000MVA (as per IEC 60076-5) in order to obtain the value of the
symmetrical short circuit current to be used for the design and tests.
Page 49Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
50
4.18
Section VI Schedule of Requirements
Terminals: Arrangement & Bushings
4.8.1 The 11kV and 66kV windings shall be brought out separately through open
bushings of outdoor, weatherproof design in accordance with IEC.
4.8.2 Bushings for 66kV terminals shall be of oil-filled condenser type construction,
draw-out type and shall each have a capacitance test point. Bushings for
11kV terminals shall be of the solid porcelain type.
4.8.4 The neutral bushing of the transformer shall be identical to the corresponding
phase terminal bushings.
4.8.4 Spacing and air clearances shall be so co-ordinated as to render the
probability of a flashover from the terminal of one winding to the terminal of
another winding negligible.
4.8.5 Leakage distance of bushings shall not be less than 25mm/kV, based on
operating phase to phase voltage.
4.8.7 Bushing terminals shall be clamp type suitable for both copper and aluminium
Busbars of sizes upto 76mm diameter.
4.8.9 Each bushing of the 66kV windings shall be mounted on a turret. Each turret
shall be suitable for accommodating at least two sets of current transformers.
4.8.10 Each bushing of the 11kV windings shall be mounted on a turret. Each turret
shall be suitable for accommodating at least three sets of current
transformers.
4.8.9 Terminal arrangement on the HV and LV sides shall be A, B, C and n, a, b, c
respectively (this shall be indicated on drawings submitted for approval before
manufacture).
4.19
Current Transformers to be Fitted
4.9.1. Current transformers shall be installed in the bushing turrets and shall be of
the following quantities, ratios, ratings and class (core 1 is the one closest to
the bushing terminal) :
PHASE
HV-side
(66kV)
A
B
CORE
BURDEN
RATIO
CLASS
1
2
1
2
3
15VA
15VA
15VA
15VA
10VA
200/1A
200/1A
200/1A
200/1A
200/?
cl. 5P10
cl. X
cl. 5P10
cl. X
cl. 1
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
C
LV-side
(11kV)
a
b
c
n
1
2
15VA
15VA
200/1A
200/1A
cl. 5P10
cl. X
1
2
3
1
2
3
4
1
2
3
4
1
2
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
10VA
15VA
15VA
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/?
1200/1A
1200/1A
cl. 0.5
cl. 5P10
cl. X
cl. 0.5
cl. 5P10
cl. X
cl 0.5
cl. 0.5
cl. 5P10
cl. X
cl 1.0
cl. X
cl. 5P10
4.9.2 Current transformers of suitable rating and class for winding temperature
indicators shall be installed to adequately cover the transformer (HV & LV) as
indicated above (as 200/? and 1200/?) for guidance.
4.9.3 Current transformers shall also comply with the requirements of IEC 60044.
4.9.4 Full technical particulars of current transformers offered, including type test
reports from an International reputable Testing Authority or a National
Standards and Testing Authority of the country of manufacture, shall be
submitted with tender.
4.20
AIR CLEARANCE
4.10.4 When totally assembled, as in service, electrical clearances in air shall be
adequate to withstand the assigned impulse withstand test voltages. Minimum
external air clearances shall be as shown under.
Nominal System Voltage between Phases
11kV
66 kV
Minimum clearance phase-to-earth and
phase-to-neutral
mm
300
830
Minimum clearance phase-to-phase
between phases of the same winding
mm
300
830
Minimum clearance between a line terminal
of the high voltage winding and a line
terminal of a lower voltage winding
mm
300
830
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52
Section VI Schedule of Requirements
Minimum clearance from live metal to oil
pipe-work including conservator and
pressure relief device
mm
300
830
4.10.5 Care shall be taken to ensure that all fittings are suitably positioned so as not
to interfere with the external connection to the bushing terminals.
4.11. INSULATION LEVELS
The complete transformer arranged for service, shall be capable of
withstanding the following voltages and shall comply fully with the
requirements of IEC 60076 Part 3, including the latest amendments.
Nominal
system
voltage
Highest
system
voltage
Lightning
Impulse
withstand
voltage, dry
Power
frequency
withstand
voltage, wet
(kV, rms)
11
66
(kV, rms)
12
72.5
(kV, peak)
(kV, rms)
95
38
325/380(internal/
140/150
external)
(internal/externa
l)
4.12. ON LOAD TAP CHANGER AND MECHANISM BOX
4.12.2 The transformer shall be complete with vacuum type on-load, electrically
driven tap changing mechanism of the high-speed resistor transition type, and
shall comply with the requirements of IEC 60214, 60512 and this
specification. The equipment shall be suitable for remote operation from a
control panel supplied with the transformer as well as for local operation from
the Motor Drive Unit (MDU) mounted on the transformer body.
4.12.3 The mechanism shall be so designed as to ensure that when a tap change
operation is in progress, it shall be able to complete the task independently
irrespective of operation of any relays or switches.
4.12.3 Adequate means shall be provided to safeguard the transformer and its
auxiliary circuits from damage should a failure of the auxiliary supply or any
other mal-operation occur during the progress of tap changing that may
prevent it from completing its task.
4.12.4 Means shall be provided in the marshalling kiosk for mechanical isolation of
the supply to the Motor Drive Unit, and a suitable thermal overload device
(details to be submitted with tender) shall be provided in the MDU for the
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
protection of the motor. The possibility of over-running the mechanism at
each end of the voltage range shall be prevented by means of limit switches
and mechanical stops. Other techniques used to prevent tap changer
runaway shall be indicated.
4.12.5 A mechanically operated device shall be provided to indicate the tap position
locally, and a suitable tap position transmitter shall be provided for the remote
tap position indication.
4.12.6 A counter shall be provided on the tap changing mechanism box to indicate
the total number of operations completed by the equipment.
4.12.7 Contactors and associated equipment for the control circuit for local/remote
and manual operations of the tap changer mechanism shall be housed in the
mechanism box.
4.12.10
The tap changer shall be housed in a separate compartment and
shall be Vacuum Type. Sufficient documentation for the vacuum switch in
form of manuals, instructions, drawings, technical characteristics, copies of
type test certificates and type test reports (from an Independent and ISO/IEC
17025 accredited Testing Laboratory), manufacturing and export experience
of the supplier shall be submitted with the tender for technical evaluation. The
tap changer shall be of a design & make approved by KPLC.
4.12.11
The Motor Drive Unit shall have the following in addition to what has
been stated above:
(b)
Isolating switch in the transformer marshalling box for the supply to the
tap changer Motor Drive Unit,
(b)
Raise/lower contactors for tap changer motor operation, and associated
single-phase protection/overload relay,
(c)
Switch for selection of local/remote tap changer control,
(d)
Switch or switches for local tap changer operation,
(e) Provisions shall be made available for hand operation in the mechanism
box.
4.12.10 The tap changer shall be of internationally reputable manufacture and
proven reliability in service. Detailed documentation and copies of
certificates shall be submitted with the tender for evaluation.
4.12.11 Remote Tap Changer Control Panel
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Section VI Schedule of Requirements
The remote tap changer control panel shall contain the following devices:











Automatic Voltage Regulating Relay (to be of KPLC approved design and
technical details shall be submitted with tender).
Off/Manual/Automatic switch for the Relay.
Raise /Lower control switch.
Raise , Lower, ‘out of step’ and tap change in progress indication lamps
Dial type Tap position indicator (technical details to be submitted with the
tender).
Master/Follower/Independent Scheme and selector switch. The Tap
Changer shall employ, negative reactance or circulating current principle
scheme for parallel operation with other three similar transformers but of
different rating.
Local /Remote switch
KV meter (technical details to be submitted with the tender)
Door operated lamp and anti-condensation heater.
Heater switch ON/OFF to control anti-condensation heater
Various control circuits controlled by Miniature Circuit Breakers
4.12.12 AUTOMATIC VOLTAGE REGULATING RELAY
The relay shall be of KPLC approved make & design and shall, as a minimum,
incorporate the following features:
 Rated voltage 110V AC.
 Rated Current 1 Amp.
 Initial time delay range 5-100 seconds, and ability to select Integrated
delay or Definite time delay.
 Inter-tap delay 1-80 seconds
 Relay voltage setting, adjustable in steps of 1V from 85 - 130V
 Line drop compensation 0-20 V at rated current for both reactive and
resistive setting
 Under voltage inhibit range 70%-90% & over current inhibit range 150%250%
 Bandwidth range 0.5-5 % of voltage level
 Over voltage inhibit
 The AVR should have a selector switch with OFF/Manual/Auto
 Should be of Numeric Design.
 The Relay shall be Designed to employ both Circulating Current
Compensation or Negative(Reverse) Reactance compounding to minimize
circulating current for Parallel Transformer Operation.
 Tap changer Maintenance, by maintaining Tap Operation count.
 Tap Changer Mechanism Failure.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Sufficient documentation in form of price, instruction manuals,
drawings, technical characteristics and test certificates from
international/national testing/standards laboratory of the country of
manufacture shall be submitted with the tender to facilitate technical
evaluation.
4.13. PARALLEL OPERATION
4.13.1 A scheme for operating this transformer in parallel with other similar units of
different rating shall be provided and wired in the marshalling kiosk (box) by
the manufacturer ready for interphasing.
4.13.2 The scheme shall maintain the transformers in stable parallel operation and
limit circulating current to a minimum.
4.13.3 In the event of this transformer being disconnected from the system, its
reconnection shall not result in its tap changer failing to operate automatically
because of tapping discrepancy.
4.13.4 Suitable selector switch shall be provided, so that any one transformer of the
group can at a time be selected as “Master”, “Follower” or “Independent”.
4.13.5 Necessary interlock blocking independent control when the units are in
parallel shall be provided.
4.13.6 The scheme shall be such that only one transformer of a group can be
selected as “Master”.
4.13.7 An out –of- step device shall be provided for each transformer which shall be
arranged to prevent further tapchanging when transformers in a group
operating in “Parallel control” are one tap out-of-step.
4.14.
MARSHALLING KIOSK (Box)
4.14.1 The marshalling kiosk shall be of outdoor, IP 55, weatherproof, verminproof type with a hinged, lockable door fitted with a glass panel to facilitate
reading of oil and winding temperature gauges without opening the door. The
kiosk shall be mounted so that its window is approximately 1600mm above
ground level; and shall accommodate at least the following items:a)
Winding temperature indicator for both HV and MV with a maximum
pointer drag hand type with a resetting knob and three separately
adjustable mercury contacts for alarm, trip and operation of cooler
control circuits as required.
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Section VI Schedule of Requirements
b)
Oil temperature indicator with a maximum pointer drag hand type with
a resetting knob and two separately adjustable mercury contacts for
alarm and trip.
c)
Mechanical isolating switch for the incoming 3 phase, 4 wire, 415V
50Hz supply to the marshalling kiosk. 415 volts and 240 volts socket
outlets (square pins) shall also be provided in the kiosk.
d)
A mechanical isolating switch for the outgoing 3 phase 4-wire 415V
50Hz supply to the OLTC Motor drive unit.
e)
Suitable starters for the cooling fan motors complete with thermal
overload/single phase protection relay and normally-closed electrical
auxiliary contacts for motor failure alarm/trip circuits.
f)
A selector switch with ‘OFF’, ‘HAND’ and AUTO positions for cooling
fan motors
g)
An internal standard screw type illumination lamp and heater for the
kiosk with respective switches. The lamp shall be door switch
operated.
h)
Wiring, fuses, links, terminal boards and cable glands for bottom entry
of multicore cables.
i)
Anti-condensation heater with a switch.
j)
Thermostat for anti-condensation heater control.
k)
Hygrostat for anti-condensation heater control.
l)
MCB control for each of the circuits.
m)
Phase sequence relay for detection of wrong phase rotation for the
supply to the fans and the OLTC Motor Drive Unit.
Detailed technical details, drawings, and schematics shall be submitted with
the tender documents for evaluation.
4.15. AUXILIARY SUPPLIES
Equipment shall be rated for the following auxiliary power supplies:
(e)
Cooler control circuits:
240 V, single phase, 50Hz
(f)
Tap changer control:
240 V, single phase, 50Hz
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
(g)
Cooling fan motors:
415 V, three phase, 50Hz
(h)
Tap changer motor:
415 V, three phase, 50Hz
4.16. TRANSFORMER TANK AND TANK COVER
4.16.1 The tank shall be of top cover design and shall be constructed of mild steel
plates of sufficient thickness and strength and shall be complete with all
accessories. It shall be designed so as to allow the complete transformer
when filled with oil to be lifted by crane or jacks, transported by road, rail or on
water without overstraining any joints and without causing subsequent
leakage of oil. The minimum thickness for sides, bottom and top cover shall
be 8mm, 20mm and 20mm respectively.
4.16.2 The base of the tank shall be so designed that it shall be possible to move the
complete transformer unit in any direction without injury when using rollers,
and/or
plates
4.16.3 The tank and its accessories shall be so designed as to prevent collecting or
trapping of gases. Where this cannot be avoided, pipes shall be provided to
vent the gas into the main expansion pipe. The vent shall have a minimum
outside diameter of 19mm except for short pipes which may be 6.35mm
minimum inside diameter.
4.16.4 All joints, other than those that may have to be broken shall be welded.
Caulking of unsatisfactorily welded joints is forbidden.
4.16.5.The main tank body shall be pressure tested and a certificate issued by the
national standards and testing laboratory ascertaining the soundness of all
welded joints. A certified copy of the certificate shall be submitted with the
tender for evaluation.
4.16.6 Tank shall be provided with lifting lugs suitable for lifting the complete
transformer with oil. Further more, a minimum of four accessible jacking
positions shall be provided to enable the complete transformer to be raised or
lowered using jacks.
4.16.7 The transformer tank and all attachments normally under oil shall be capable
of withstanding full vacuum. The oil conservator shall withstand at least 35%
full Vacuum.
4.16.8 Tank cover shall be of such a design and construction as to prevent
accumulation of water and shall be bolted to the flange on the tank top to form
a weatherproof joint.
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Section VI Schedule of Requirements
4.16.9 Inspection openings shall be provided as necessary to give easy access to
bushings, tapping switch and for testing or general inspection.
4.16.10 Tank cover and inspection covers shall be provided with suitable lifting
arrangements. Inspection covers shall not weigh more than 25 kg apiece.
4.16.11 The tank cover shall be fitted with isolated pockets for oil and winding
temperature instrument bulbs. Protection shall be provided where necessary
for each capillary tube. The pocket shall be fitted with a captive screwed cap
to prevent the ingress of water. Detailed drawings shall be provided.
4.16.12 The pocket shall be located in a position of maximum oil temperature at
continuous
maximum rating and it shall be possible to insert and remove the instrument
bulbs
without lowering the oil in the tank.
4.16.14 Gaskets for weather and oil-tight joint faces shall be of synthetic rubber-andcork
composition and shall have a minimum thickness of 5mm, except that
where
jointing faces are precision-machined thinner gaskets may be used.
4.17. PAINT WORK
Cleaning and painting shall be in accordance with the following
requirements. Any deviations in methodology shall be stated and
may only be those that will produce demonstrably superior results.
A test report issued by the national standards and testing laboratory shall
be produced at the time of acceptance testing of the transformer.
4.17.1 Tanks and Accessories
(d)
External and internal surfaces of all transformer tanks and chambers and
other fabricated steel items shall be cleaned of scale, rust and surface
dirt by blast cleaning or other suitable approved method. After cleaning,
these surfaces should be immediately covered with paint.
(e)
The exterior shall be thoroughly cleaned by shot blasting or other
approved method and given priming coat followed by two coats of
contrasting colours of durable weather-resisting paint. The final coat
shall be high gloss of shade No. 632 (Admiralty Grey) according to BS
381C.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
(f)
The interior of all transformer tanks and other oil-filled chambers shall be
cleaned of all scale and rust by shot blasting or other approved method.
Hot oil resistant varnish on white synthetic enamel paint is to be used for
painting the inside of all oil filled chambers, including transformer tanks
and CT chambers & covers. The final coat shall be of a light-coloured
anti-condensation finish.
4.17.2 Radiators
(c)
Radiators shall be thoroughly degreased and treated externally by
phospating and/or other rust-inhibiting process.
(d)
Radiators shall be flood-painted with a primer and two coats of durable
weather and oil resisting paint. The final external coat shall be high gloss
of shade No. 632 (Admiralty Grey) according to BS 381C. The total
paint thickness shall not be less than 85μm at any point.
4.18. COOLING SYSTEM
4.18.1 Radiators shall be supplied in banks as suitable. Each bank shall be fitted
with gate valves with legible labelling for OPEN/CLOSED positions and used
for full isolation from the main tank. Each radiator shall have a top and
bottom isolating butterfly valve. The radiator design shall exclude
accumulation of rainwater.
4.18.4 Radiator banks shall be mounted directly to the transformer main tank for best
use of space.
4.18.5 Each radiator shall have a bleeding facility (to allow escape of air) on top.
4.18.4 Separately mounted a-c motor driven fans fitted with wire mesh guards shall
be provided for the radiators.
The fan motors shall be totally enclosed,
weatherproof, outdoor type suitable for continuous operation and shall be
fitted with terminal boxes and glands to accommodate multicore electric
supply cables. Technical details of the fan motor shall be supplied with the
tender.
4.18.5 Suitable starters, protection/warning devices, contactors and switches for the
motors shall be provided as stipulated in clause 4.14 above.
4.18.6 Suitable lifting lugs shall be provided for removal and assembly of radiators.
4.18.7 The complete cooling system and the fittings shall be fully co-ordinated.
Where necessary, the cooling fan motors shall be fired in designed groups
and in such sequence as to achieve the desired control at maximum
efficiency and safety.
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Section VI Schedule of Requirements
4.19. FITTINGS
4.19.1 Conservator
The transformer shall be provided with a conservator having a filling
orifice, an isolating valve, a drain valve and a cobalt free
dehydrating breather (with oil seal) which shall be accessible from
ground level. The drain pipe shall be located at the lowest point in
the conservator in its final installed position and welded such that it
can drain all the sludge in the conservator.
The conservator shall be partitioned proportionately to separate the main
tank oil and the tapchanger oil. Each compartment to be fitted with
a breather and an oil level indicator with electrical contacts for
alarms. The conservator complete with drain valve shall be in such
a position as not to obstruct the electrical connections to the
transformer. An oil gauge shall be provided at one end of the
conservator marked with oil levels that can be read by a person
standing on the ground. Expansion joints may be provided in the
inlet and outlet pipes to the transformer as necessary.
4.19.2 Gas and Oil Actuated Relay (Transformer main tank)
Transformers shall be provided with a gas and oil actuated relay (Buchholz
relay) of double float type with tripping contacts to detect accumulation of gas
and sudden changes of oil pressure. Shut off valves and flange couplings
shall be provided to facilitate easy removal of the relay without lowering oil
level in the main tank. A bleed valve for gas venting, a test valve and a
terminal box suitably wired to the marshalling kiosk shall also be provided.
The gas venting pipe shall be brought down to a height reachable from
ground level and shall be fitted with a gas sampling device at the end.
Provision should be made on the relay for simulation of gas and oil surge for
testing purposes.
4.19.3 Gas and Oil Actuated Relay (Tap changer compartment)
Tap changer compartment shall be provided with a gas and oil actuated relay
(Buchholz relay) of double float type with tripping contacts to detect
accumulation of gas and sudden changes of oil pressure. Shut off valves and
flange couplings shall be provided to facilitate easy removal of the relay
without lowering oil level in the tap changer compartment. A bleed valve for
gas venting, a test valve and a terminal box suitably wired to the marshalling
kiosk shall also be provided. The gas venting pipe shall be brought down to a
height reachable from ground level and shall be fitted with a gas sampling
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
device at the end. Provision should be made on the relay for simulation of gas
and oil surge for testing purposes.
4.19.3 Pressure Relief Device
A pressure relief device shall be provided for the main tank, complete with trip
contacts suitably wired to the marshalling kiosk. The device shall be
resettable after an operation. Details of the device shall be submitted with the
offer.
4.19.4 Winding Temperature Indicator
(g)
The transformer shall be provided with winding temperature indicator,
maximum indicator and associated current transformers. The
temperature indicator shall have a scale ranging from 20°C to 150°C,
preferably uniformly divided and its type to be stated in the bid. The
indicator shall have two sets of independently adjustable contacts as
follows:
(i) Alarm
Adjustable setting: 70°C to 150°C
Fixed differential: Not more than 10°C
(ii) Trip
Adjustable setting: 70° to 150°C
Fixed differential:
Not more than 10°C
(h)
All contacts shall be adjustable to a scale and shall be accessible on
removal of the cover for dial type devices. For purposes of (i) and (ii)
above, the contacts shall be suitable for making or breaking 150VA
between the limits of 30 and 250 V a.c. or d.c., and making 500 VA
between the limits of the 110 and 250 V d.c.
(i)
Isolating and test links shall be provided in a control cubicle to allow for
measuring the oil temperature and testing the heater coil.
(j)
The current transformer providing winding temperature indication shall
be located at the discretion of the manufacturer, in the best position for
the duty.
(k)
Calibration of indicator shall be related to the winding having the
maximum temperature rise.
(l)
If the value on the winding temperature indicator varies by more than
3°C from the values derived from the tests specified in clause 5, then
adjustments shall be made to the equipment to achieve these limits.
4.19.5 Oil Temperature Indicator
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Section VI Schedule of Requirements
Transformers shall be provided with an oil temperature indicator with a
maximum pointer and contacts for alarm and trip signals, similar to
winding temperature indicator above.
4.20. ACCESSORIES
The following shall be provided:
4.20.1 Valves with blank flanges fitted at the top and bottom for oil filtration
purposes, having the following features:
(e)
The valve located at the bottom of the tank shall also be suitable for
draining oil from the transformer tank.
(f)
All valves shall close with a clockwise rotation. The main inlet and outlet
valves shall be provided with “open” and “closed” position indicators,
visible from ground level.
(g)
All valves shall have provision for padlocking in the open and closed
position for operation purposes. The hole for the padlock shall have a
clearance of not less than 8mm and not more than 10mm. Locking pin
shall be of anti-rattle design to limit noise emissions. The locking
padlocks shall be provided.
(h)
Closed/Open positions of all valves must be clearly marked.
4.20.2 Oil sampling device appropriately located to obtain samples of transformer oil
from the top and bottom of the tank.
4.20.3 Two earthing terminals located at diagonally opposite corners of the tank.
4.20.4 Air release valves or plugs for the main tank, suitably located.
4.20.6 Non-deteriorating detailed diagram and rating plates.
4.20.6 Other Fittings/accessories
Diagram plate
Plate of valves and oil piping.
Motor drive electrical and protection diagram.
Cooling control electrical and protection diagram.
Electrical scheme for operating this in parallel with other similar units.
Detailed list of the transformer equipment & fittings including their drawings,
brochures & instruction manuals.
Shipping data
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Detailed erection, installation, operation and maintenance manuals in English
language.
Testing Plan.
Impact recorder for the whole duration of transit and a report provided
afterwards.
2 Sets of keys for padlocking devices.
(all control boxes as well as valves to be padlocked)
4.21. TRANSFORMER OIL
The transformer and all associated oil immersed equipment shall be supplied oil
filled. The oil shall comply with all the requirements of IEC 60296 (class 1: uninhibited oil). Tenderer shall provide the chemical composition and properties of the
oil and the replacement cycle over the expected life of the transformer.
4.22. CAPITALIZATION
4.22.3 Transformer losses shall be capitalized at the following rates to facilitate
evaluation and comparison of tenders.
Total load losses, ONAF rating (copper
loss + stray loss) at rated current at 750
C in KW, including auxiliary losses
Total no load losses in KW (core loss +
dielectric loss)
US$ 1070 per kW
US$ 4300 per kW
Losses will be capitalized at the above rates and added to the bid price
according to the formula below:
Gep = Gbp + G($), where Gep = Bid evaluation price, Gbp = Bid price
and
G($) = Adjustment for the cost of the operation
G($) is obtained by using the following formula:
G($) = US$ 1070 X {Total load losses, ONAF rating (copper loss + stray
loss) at rated current at 750 C in KW, including auxiliary losses} + US$ 4300
X {Total no load losses in KW (core loss + dielectric loss)}.
4.22.4 The guaranteed transformer losses used in the above capitalization formula
shall be the maximum allowed and no plus tolerance shall be allowed during
acceptance testing.
4.23. QUALITY MANAGEMENT SYSTEM
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Section VI Schedule of Requirements
4.23.1 The bidder shall submit a quality assurance programme (QAP) that will be
used to ensure that the transformer design, material, workmanship, tests,
service capability, maintenance and documentation, will fulfil the requirements
stated in the contract documents, standards, specifications and regulations.
The QAP shall be based on and include relevant parts to fulfil the
requirements of ISO 9001:2008.
4.23.2 The Manufacturer’s Declaration of Conformity to reference standards and
copies of quality management certifications including copy of valid and
relevant ISO 9001: 2008 certificate shall be submitted with the tender for
evaluation.
4.23.3 The bidder shall indicate the delivery time of each type of transformer,
manufacturer’s monthly & annual production capacity and experience in the
production of the type and size of transformer being offered. A detailed list &
contact addresses (including e-mail) of the manufacturer’s previous
customers outside the country of manufacture for exact or similar rating of
transformers sold in the last five years shall be submitted with the tender for
evaluation.
11.
TESTS AND INSPECTION
5.4 The transformer shall be inspected and tested in accordance with the
requirements of IEC 60076 and this specification. It shall be the responsibility of
the manufacturer to perform or to have performed all the tests specified.
Tenderers shall confirm the manufacturer’s capabilities in this regard when
submitting tenders. Any limitations shall be clearly specified.
5.5 Copies of Type Test Certificates and Type Test Reports issued by the relevant
Independent International or National Testing/ Standards Authority of country of
manufacture or ISO/IEC 17025 accredited and independent testing laboratory
shall be submitted with the offer for evaluation (all in English Language). A copy
of the accreditation certificate for the independent laboratory shall also be
submitted. Any translations of certificates and test reports into English language
shall be signed and stamped by the Testing Authority.
1) Copies of type test certificates and type test reports for the transformer to
be submitted for tender evaluation shall include:
d) Dielectric tests to IEC 60076 (Lightning Impulse and Power Frequency
Withstand Tests).
e) Short circuit withstand tests to IEC 60076.
 thermal ability of the transformer to withstand short circuit,
 ability of the transformer to withstand the dynamic effects of short
circuit
f) Temperature rise test to IEC 60076.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Note: Temperature rise test and routine tests to IEC 60076 if conducted at the
manufacturer’s premises (factory) MUST be in the presence of
representatives of ISO/IEC 17025 accredited and independent testing
laboratory; who shall sign the certificates and test reports.
2) Copies of type test certificates and type test reports for the on load tap
changer to be submitted for tender evaluation shall include:
g) Dielectric tests (Lightning Impulse and Power Frequency Withstand
Tests).
h) Short circuit withstand test.
i) Temperature rise test.
j) Switching tests.
k) Transition impedance test.
l) Mechanical tests.
5.6 The transformer shall be subject to acceptance tests at the manufactures’ works
before dispatch. Acceptance tests shall be witnessed by two Engineers
appointed by The Kenya Power and Lighting Company Limited (KPLC) and shall
include the following:
5.3.1 Routine tests to IEC 60076 (to be done during acceptance testing at
factory)

Measurement of winding resistance

Ratio test

Vector group

Separate source voltage withstand test

Induced over-voltage

Insulation resistance

Oil leakage test on fully assembled transformer for 12 hours

Measurement of impedance voltage

Magnetic balance

Measurement of no-load loss and current

Measurement of load loss (at normal & extreme taps)

Tests on on-load tap-changer

Tests on on-load tap-changer remote control panel

Efficiency at 50%, 75%, 100% loading at unity p.f and rated terminal
voltage (Corrected to 75C)
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Section VI Schedule of Requirements
5.3.2 Type Tests to IEC 60076 (to be done during acceptance testing at
factory)


Temperature rise test – To be performed on one unit during acceptance
testing.
Lightning impulse withstand test.
5.3.3 Additional tests (to be done during acceptance testing at factory)













5.7
Visual Inspection (verification of auxiliaries, fittings & accessories,
markings & nameplates, paintwork, workmanship and finish)
Measurement of power taken by the fans
Insulation dissipation factor
Condenser bushing capacitance and tan delta
DGA (dissolved gas analysis) of the insulating oil.- To be performed
before and after temperature rise test
Acoustic and sound level
Insulation tests on the auxiliary wiring in the marshalling boxes
Measurement of zero sequence impedance
Measurement of harmonics no-load current
CT ratio and polarity
Measurement of zero phase sequence impedance
Paint thickness
Tank pressure test
Testing Facility
5.7.1 The bidder shall provide current e-mail address, fax and telephone numbers
and contact person at the Testing Authority where Type Tests and Special
Tests to IEC 60076 were carried out.
5.7.2
All test and measuring equipment to be used during acceptance testing shall
have been calibrated and copies of valid calibration certificates shall be
provided to KPLC Engineers. A detailed list of workshop tools, test/measuring
equipment and list of tests to IEC 60076 that can be carried out by the
manufacturer shall be submitted with the tender for evaluation.
5.8 Test reports for each transformer (including its individual components) shall be
submitted to The Kenya Power and Lighting Company for approval before
shipment.
5.9 On receipt of the transformer, KPLC will inspect it and may perform or have
performed any of the relevant tests in order to verify compliance with the
specification. The manufacturer shall replace/rectify without charge to KPLC,
equipment which upon examination, test or use fail to meet any or all of the
requirements in the specification.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
12.
MARKING, LABELLING AND PACKING
6.5
The transformer and associated components shall be packed in a manner as
to protect it from any damage in transportation and handling. It shall be
dispatched oil-filled and fully wired. All piping shall follow the contour of the
transformer as closely as possible to avoid damage during transportation and
handling. Auxilliary equipment and accessories/fittings shall be protected
against mechanical damage and oil vandalism.
6.6
Each assembly and package of items associated with the transformer shall be
suitably marked for ease of identification.
6.7
In addition to markings and labels required elsewhere in the tender &
specification, each equipment and component shall be marked in accordance
with the relevant IEC standard. Each transformer shall be provided with a
rating plate of weatherproof material, fitted in a visible position, showing the
appropriate details listed in IEC 60076. The entries on the plate shall be
indelibly marked (either by etching, engraving or stamping).
6.8
In addition, the name plate shall include load and no load losses for the
highest, lowest and principle tap positions, temperature class of insulation,
connection diagram and the inscription 'PROPERTY OF THE KENYA
POWER AND LIGHTING CO.' all marked indelibly as in 6.4.
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Section VI Schedule of Requirements
Annex A
SCHEDULE OF GUARANTEED TECHNICAL
TRANSFORMER OFFERED
No.
Requirements
1.
Name of the manufacturer and country of
origin
2.
Conforming to standard
3.
Service (indoor/outdoor), altitude,
temperature range, humidity and
environment (pollution severity level)
4
Rating
a)
1. With ONAN cooling, MVA
2. With ONAF cooling, MVA
b)
Rated no load voltage
HV-kV
LV-kV
5.
Temperature rise of top oil (deg.C)
6.
Temperature rise of winding measured by
resistance.
7.
i)
With ONAN cooling (deg. C)
ii)
With ONAF cooling (deg. C)
iii)
load
Period of operation of transformer at full
without calculated winding hot spot
temperature exceeding 140C and with
a. 50% coolers off
b. 100% coolers off
Rated frequency (Hz)
8.
No. of windings
9.
Number of phases
10.
Connection symbol & vector group
11.
Tappings:
i)
ii)
Type of tap changer
Tap step (percent)
PARTICULARS
FOR
BIDDER’S OFFER
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
iii)
Total tap ranges - (+) percent to (-)
percent
iv)
12.
Tappings provided at
required)
(HV-N
Magnetization data at no load, at 90%
rating, at 100% rating and at 110% rated
voltage and load and frequency
i) Current in Amps
ii) Power factor
iii) Total no load losses in KW (core loss +
dielectric loss)
13.
Total load losses (copper loss + stray loss)
at rated current at 750 C in KW
i)
For ONAN Rating
ii) For ONAF Rating (including
auxiliary losses)
iii) Auxiliary Losses
14.
% impedance voltage at rated current and
frequency at 750 C.
i) Positive sequence at normal tap in %
ii) Positive sequence at Max. Voltage tap in
%
iii) Positive sequence at Min. voltage tap in
%
iv) Minimum short-circuit apparent power
v) symmetrical short circuit current
15.
16.
Reactance per phase at rated frequency at
normal tap on rated MVA base: HV to LV - %
Resistance at 750 C of:
HV Winding in ohms (at principle & extreme
taps)
LV Winding in ohms
17.
Efficiency at 750 C taking in to account input of
cooling plant loss:
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Section VI Schedule of Requirements
At Unity Power Factor and at 0.8 Power
Factor Lagging:
i) At 125% full load
ii) At 100% full load
iii) At 75% full load
iv) At 50% full load
18.
Regulation at full load & at 750 C
i)
ii)
19.
At unity p.f. in %
At 0.8 p.f. (lag) in %
a) Short time thermal rating of HV winding
in kA
and duration in seconds
b) Short time Thermal rating of LV winding
in kA
& duration in seconds
20.
a) Overload capacity for 2 hours after
continuous
full load run
b) Thermal time constant in hours
21.
a)
Test Voltages at factory:
i) Lightning impulse kV (peak)
ii) Power frequency voltage withstand kV
(rms)
ii) Altitude of factory
b) Voltage to earth for which star point will
be insulated.
i)
ii)
Impulse kV (Peak)
Power frequency (kV)
22.
Noise level when energized at normal
voltage and normal frequency at no load.
23.
Approximate weights
i)
Core (kg)
ii) Windings (kg) (Copper + Insulation)
(separately)
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
iii)
Tank & Fittings (kg)
iv)
v)
Oil (kg)
Total weight (kg)
24.
Details of oil and quantity in liters
25.
Net core area in sq. meters
26.
Type of transformer (stacked core type
required)
27.
Material of Laminations
28.
i.
Grade of CRGO
ii.
Thickness of lamination
iii.
Stack-factor
iv.
Specific weight/m3
v.
Specific loss watts/kg.
Maximum flux density at rated voltage and
frequency in Tesla/lines/cm2
Conductor area in sq. cm. and current
density in Amps/Sq. cm.
29.
HV
LV
Regulation winding.
Type of windings
30.
HV
LV
31.
Winding insulation type and class, graded
or ungraded
HV
LV
32.
a) Insulating material
i)
Turn insulation
ii)
HV side
iii)
LV side
b) Between HV and LV as applicable.
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Section VI Schedule of Requirements
c) For core bolts, washers and end plates
d) Tapping connection
33.
i)
Type of axial support:HV winding
LV winding
ii)
34.
Type of Radial Coil support :HV winding
LV winding
Clearances in air
Phase to phase HV - HV
HV - LV
LV - LV
Phase to earth
HV - E
LV - E
35.
Details of Tank
i)
ii)
iii)
37.
Type of the tank
Thickness of sides in mm
iv)
Thickness of Bottom in mm
v)
Thickness of Cover in mm
vi)
36.
Material for tank
Thickness of Radiators in mm
Shipping details – List parts normally detached
for transport and indicate protection against
mechanical damage and oil vandals for entire
transformer
Details of Bushings (indicate details for
each)
i)
Type
ii)
One minute dry withstand
frequency voltage kV (rms)
iii)
One minute wet withstand power
frequency voltage kV (rms)
power
iv)
1.2/50s lightning impulse voltage, dry
(kVp)
HV LV
NEUTRAL
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
38.
v)
Total creepage distance in Air (mm)
vi)
Weight of bushings (kg)
vii)
Phase to earth clearance in air of live
parts at the top of bushings.
viii)
Maximum current rating of each bushing
ix)
Quantity of oil in the bushings in liters
On load tap changer (OLTC)
i)
Manufacturer and Type & Model No.
ii)
Rating
iii)
Rated voltage
kV
iv)
Rated current
Amps
v)
Step voltage
kV
vi)
No. of steps
No.
vii)
Approximate over all dimensions (Width
x Breadth x Depth) in mm
viii)
Approximate overall weight in kg.
ix)
Time to complete one tap change step
in seconds
x) List technical documents including type test
certificates and type test reports,
manufacturing experience, sales records,
installation instructions and manuals and
manufacturer’s authorization submitted for
the OLTC offered.
39.
Cooling System:
i)
Grade of oil
ii) Quantity of oil in Transformer
iii) Weight of oil in Transformer
in litres
in litres
iv) Type and make of material used for
radiators.
v) Total radiating surface
in m2
vii) No. of tubes/fins & copulate dimensions
thereof.
viii) Total weight of Radiators in kg.
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Section VI Schedule of Requirements
40.
Cooling Equipment : Fan motor
i)
ii)
iv)
Make and Type (Details)
Number connected --(No.)
Nos. in standby --(No.)
Rated power ---
v)
Rated Voltage
vi)
Temp. at which control is adjustable
vii)
Capacity in Litres/Minute
iii)
41.
(kW)
Overall dimensions of transformer including
cooling gear, tap changing gear etc.
a)
Length mm
b)
Breadth mm
c)
Height mm
d)
Reference drawing No.
42.
Type and size of oil temperature indicator.
43.
Type of oil level indicator.
44.
Type and size of Gas operated relay.
Type & size of winding temperature indicators.
45.
47.
Ratio and Type of CT used for winding
temperature indicator
Capacity of conservator vessel (Litres)
48.
Type of oil preservative installed
49.
Valve sizes and Numbers required/fitted
46.
50.
51.
i)
drain valves -mm- No.
ii)
filter valves -mm- No.
iii)
sampling valves -mm- No.
Size of Rail gauge for installation in yard
a)
Longer axis
b)
Shorter axis
a)
Type and make of pressure relief device
b)
Minimum pressure at which the device
operates (kPa)
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
52.
53.
Make & size of silica-gel breaker.
Manufacturer’s Guarantee and Warranty
54.
List catalogues, brochures, technical data,
drawings submitted to support the offer.
55.
Detailed list & contact addresses of the
manufacturer’s previous customers outside the
country of manufacture for exact or similar rating of
transformers sold in the last five years submitted to
support the offer.
List Type Test Certificates and Type Test Reports
submitted with tender (indicate test report numbers,
date, Independent Testing Institution and contact
addresses)
d) Dielectric tests to IEC 60076 (Lightning Impulse
and Power Frequency Withstand Tests).
e) Short circuit withstand test to IEC 60076.
 thermal ability of the transformer to
withstand short circuit,
 ability of the transformer to withstand the
dynamic effects of short circuit.
56.
57.
f) Temperature rise test to IEC 60076.
Note: Temperature rise test to IEC 60076 if
conducted at the manufacturer’s premises
(factory) MUST be in the presence of
representatives of ISO/IEC 17025 accredited
and independent testing laboratory; who shall
sign the certificates and test reports.
Testing facility (of Detailed
list
of
the manufacturer) manufacturer’s
workshop
tools, test and measuring
equipment
List of tests to IEC 60076
that can be carried out by
the manufacturer
59.
List Acceptance Tests to be
witnessed by KPLC Engineers
at the factory
List test reports (for transformer and components)
to be submitted to KPLC for approval before
shipment
Copy of ISO 9001:2008 Certificate submitted
60.
Quality Assurance Programme
61.
Manufacturer’s Declaration of Conformity to
Standards (including IEC 60076)
Deviations from tender specifications and
58.
62.
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Section VI Schedule of Requirements
64.
supporting data, test reports, technical documents
etc.
Inspection of the transformer and components at
KPLC stores/site.
List and details of current transformers to be fitted
65.
Aauxiliaries, fittings and accessories to be fitted.
63.
…………………………………………………………………………………………….
Manufacturer’s Name, Signature, Stamp and Date
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Technical Specifications for 23MVA 33/11KV Transformer
FOREWORD
13.
SCOPE
14.
REFERENCES
15.
TERMS AND DEFINITIONS
16.
REQUIREMENTS
17.
TESTS AND INSPECTION
18.
MARKING, LABELLING AND PACKING
ANNEX A:
Guaranteed Technical Particulars (to be filled and signed by the
Manufacturer and submitted together with copies of manufacturer’s
catalogues, brochures, drawings, technical data, sales records and
copies of type test certificates and type test reports for tender
evaluation)
Page 77Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
78
13.
Section VI Schedule of Requirements
SCOPE
This specification is for newly manufactured outdoor oil type power
transformer as described below:
23MVA, 33000/11000 volts, 50 Hz, ONAN/ONAF three phase power
transformer (the Vector Group shall be stated on the schedule of
requirements in the tender).
The specification also covers inspection and test of the transformer as well as
schedule of Guaranteed Technical Particulars to be filled, signed by the
manufacturer and submitted for tender evaluation.
The specification stipulates the minimum requirements for 23MVA 33kV/11kV
power transformer acceptable for use in the company and it shall be the
responsibility of the Manufacturer to ensure adequacy of the design, good
workmanship and good engineering practice in the manufacture of the
transformer for KPLC.
The specification does not purport to include all the necessary provisions of a
contract.
14.
REFERENCES
The following standards contain provisions which, through reference in
this text constitute provisions of this specification. Unless otherwise
stated, the latest editions (including amendments) apply.
ISO 1461:
IEC 60076:
Hot dip galvanized coatings on fabricated iron and steel articles
– Specifications and test methods.
Power transformers.
IEC 60044: Instrument transformers.
IEC 60296: Specification for unused mineral insulating oil for transformers
and switchgear.
IEC 60354:
Loading guide for oil – immersed power transformers.
IEC 60214: Tap-changers - Part 1: Performance requirements and test
methods, Part 2: Application guide.
IEC 60512:
Connectors for electronic equipment
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
BS 171: Power transformers
BS 381C:
purposes
Specification for colours for identification coding and special
15.
TERMS AND DEFINITIONS
3.1
The terms and definitions given in the reference standards shall apply.
3.2
The term similar rating where used in this specification shall be for
transformer ratings within the range 23MVA – 100MVA and primary voltage
rating of 33kV – 220kV and secondary voltage of 11kV – 33kV.
16.
REQUIREMENTS
4.21
Service Conditions
4.1.5 Operating conditions
The transformer shall be suitable for continuous outdoor operation in
tropical areas with the following conditions.
(k)
Altitude:
Up to 2200 metres above sea level.
(l)
ºC
Temperature: average of +30ºC with a minimum of -1ºC and max +40
(m)
Humidity:
up to 95%,
(n)
Pollution:
Design pollution level to be taken as “Very Heavy”
(Pollution level IV: 31mm/kV) according to IEC 815.
(o)
Isokeraunic level: 180 thunderstorm days per year
4.1.6 System characteristics
g) The primary HV system is 33,000 volts, 3 phase, 3 wire, 50Hz, with
neutral point solidly earthed.
h) The secondary MV system is 11,000 volts, 3 phase, 3 wire, 50Hz, with
neutral point solidly earthed.
i) The Transformer shall be operated at a high loading factor.
4.22
General Requirements
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Section VI Schedule of Requirements
4.22.1 The transformer shall be outdoor, oil-immersed, of ONAN/ONAF
classification and core type (lamination stackings). All offers shall comply with
the requirements of IEC 60076. Any deviations/additional requirements shall
be as stated in this specification.
4.22.2 The transformer shall be a three-phase integral unit.
4.22.3 The transformer shall be of the free breathing type. A dehydrating cobalt free
breather of approved design shall be provided.
4.22.4 The transformer and accessories shall be designed to facilitate operation,
inspection, maintenance and repairs. All apparatus shall be designed to
ensure satisfactory operation under such sudden variations of load and
voltage as may be met with under working conditions on the system, including
those due to short circuits.
4.22.5 The design shall incorporate every reasonable precaution and provision for
the safety of all those concerned in the operation and maintenance of the
equipment keeping in view the regulatory requirements in Kenya.
4.22.6 All material used shall be new and of the best quality and of the class most
suitable for working under the conditions specified in clause 4.1 and shall
withstand the variations of temperatures and atmospheric conditions arising
under working conditions without undue distortion or deterioration or the
setting up of undue stresses in any part, and also without affecting the
strength and suitability of the various parts for the work which they have to
perform.
4.22.7 Corresponding parts liable to be replaced shall be interchangeable.
4.22.8 All outdoor apparatus, including bushings insulators with their mountings,
shall be designed so as to avoid pockets in which water can collect.
4.22.9 All connections and contacts shall be of ample section and surface for
carrying continuously the specified currents without undue heating and fixed
connections shall be secured by bolts or set screws of ample size, adequately
locked. Lock nuts shall be used on stud connections carrying current. All
leads from the winding to the terminals and bushings shall be adequately
supported to prevent injury from vibration including a systematical pull under
short circuit conditions.
4.22.10
All apparatus shall be designed to minimize the risk or accidental
short-circuit caused by animals, birds or vermin.
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Chapter 4: Technical Specification for Power Transformers
4.22.11
In tank on-load-tap changers shall be located such that the space
above the diverter switch chamber will be free of inter-connecting pipes etc.
for lifting the diverter switch unit for inspection and maintenance purposes.
4.22.12
Galvanizing shall be applied by the hot-dipped process to ISO 1461
and for all parts other than steel wires shall consist of a thickness of zinc
coating equivalent to not less than 610g of zinc per square meter of surface.
The zinc coating shall be smooth, clean and of uniform thickness and free
from defects. The preparation of galvanizing and the galvanizing itself shall
not adversely affect the mechanical properties of the coated material. The
quality will be established by tests as per ISO 1461.
4.22.13
All bolts, nuts, and washers exposed to atmosphere and in contact with
non-ferrous parts which carry current shall be of phosphor bronze.
4.22.14
If bolts and nuts are placed so that they are inaccessible by means of
ordinary spanners, suitable special spanners shall be provided by the
supplier.
4.22.15
Except for hardware, which may have to be removed at site, all
external surfaces shall receive at least four coats of paint. The total dry film
thickness shall be between 100 and 130 microns.
4.22.16
Descriptive labels for mounting indoors or inside cubicles and kiosks
shall be of material that will ensure permanence of the lettering. A matt or
satin finish shall be provided to avoid dazzle from reflected light. Labels
mounted on dark surface shall have white lettering on a black background.
Danger notices shall have red lettering on a white background.
4.22.17
All interior surfaces of chambers or kiosks that are in contact with air
shall receive at least three coats of paint, of which the topcoat shall be of a
light shade.
4.22.18
The design and all materials and processes used in the manufacture of
the transformer, shall be such as to reduce to a minimum the risk of the
development of acidity in the oil.
4.22.19
Every care shall be taken to ensure that the design and manufacture of
the transformers and auxiliary plant shall be such to have minimum noise and
vibration levels following good modern manufacturing practices. The
maximum noise levels shall be stated in the bid.
4.23
Ratings
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Section VI Schedule of Requirements
4.3.1 (a) The windings of the transformer shall be rated at 23MVA (ONAF), with a
minimum ONAN rating of 18 MVA. These ratings shall be for the operating
conditions stated in clause 4.1.
(b) The rating specified in this clause shall be the continuous rating at
the maximum ambient temperature and altitude given in clause 4.1.
4.3.2 (a) The transformer shall be capable of carrying its full normal rating
continuously at any tap under the conditions stated in clause 4.3.1 without
undue stress, overheating, or the temperature rise in the hottest region
exceeding 55ºC and 60ºC in oil and windings respectively.
(b) The loading capabilities shall be demonstrated by a temperature – rise
test. This test shall be done in the presence of KPLC Representatives during
factory visit.
4.3.3 The transformer shall be capable of withstanding the maximum fault level at
its rated voltage and impedance for 2 seconds. The design should cater for
the expected lifetime of the transformer.
4.3.4 The thermal ability to withstand short circuit shall be demonstrated by
calculation as per IEC 60076-5 and the calculation shall be submitted with
tender. The duration of the current to be used for the calculation of the
thermal ability to withstand short circuit shall be 2 seconds while the
maximum permissible value of the average temperature of each winding shall
be as per IEC 60076-5.
4.3.5 The ability of the transformer to withstand the dynamic effects of short circuit
shall
be demonstrated by tests and complete test reports (including oscillograms
and records of the condition of the transformer before and after the shortcircuit test) shall be submitted for tender evaluation.
4.24
Winding and Connections
4.4.27 The VECTOR GROUP shall be stated on the schedule of requirements in the
tender. Typical vector groups used in KPLC include Dyn1, Dyn11 and
YNyn0d11.
4.4.28 The transformers shall be capable of operation without danger on any
particular tapping at the rated MVA when the voltage may vary by ± 10% of
the voltage corresponding to the tapping.
4.4.29 The windings and connections as well as the insulating material shall not
soften, ooze, shrink or collapse during service. The materials shall be noncatalytic and chemically inactive in transformer oil during service.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.4.30 No strip conductor wound on edge shall have a width exceeding six times its
thickness. The conductors shall be transposed at sufficient intervals to
minimize eddy currents and equalize the current and temperature distribution
along the windings.
4.4.31 The windings and connections shall be properly braced to withstand shocks
during transportation or due to short circuit and other transient conditions
during service.
4.4.32 Adequate pre-shrinkage of the coil assembly using pre-compressed press
board material having low moisture content for the radial spacer blocks shall
be ensured by the manufacturers so that there is no displacement of the
radial spacer blocks due to frequent short circuits on the transformers.
4.4.33 All windings after being wound and all fibrous hygroscopic materials used in
the construction of the transformer shall be dried under vacuum and
impregnated with hot oil.
4.4.34 The coil clamping rings wherever used shall preferably be of flat insulated
steel laminations.
4.4.35 The radial spacer blocks must be made of pre-compressed pressboard
material, which will not soften while in contact with oil or fray out into fibers or
edges. The slots should be so dimensioned that the blocks will not come out
of the slots.
4.4.36 All joints shall be brazed/crimped considering the vibrations due to short
circuits and load fluctuations.
4.4.37 KPLC will inspect built-up winding for its quality, weight of copper, insulation
and overall weight of coil assembly. The size of conductor used for different
windings shall also be checked during stage inspection to check the current
density.
4.4.38 The transformer shall be designed with particular attention to the suppression
of harmonic voltage, especially the third and fifth, so as to eliminate waveform distortion and from any possibility of high frequency disturbances,
inductive effects or of circulating currents between the neutral points at
different transforming stations reaching such a magnitude as to cause
interference with communication circuits.
4.4.39 The windings shall be designed to reduce to a minimum the out-of-balance
forces in the transformer at all voltage ratios.
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4.25
Section VI Schedule of Requirements
Tapping
4.5.1 Tapping Range
The transformer shall be provided with tapping on the 33 kV winding for a
variation of no load primary voltage for parallel operation, with Tap No. 1
having the highest voltage assignment, as follows:
33,000 volts + 8  1.67%
- 8  1.67%
4.5.2. Tapping Method
Tapping shall be carried out by means of an on-load tap changer as
described in clause 4.12 below.
4.26
Core and Flux Density
a) Core
4.26.1 The core shall be constructed from the laminations of high grade cold rolled
non-aging, grain oriented silicon steel known as M4 or superior grade CRGO
steels of maximum 0.27mm or less lamination thickness especially suitable
for transformer core. The grade of CRGO shall be stated in the bid.
4.26.2 The design of the magnetic circuit shall be such as to avoid static discharges,
development of short-circuit paths within itself or to the earthed or to the
clamping structure and the production of flux components at right angles to
the plane of the laminations which may cause local heating.
4.26.3 Every care shall be exercised in the selection, treatment and handling of core
steel to ensure that as far is practicable, the laminations are flat and the finally
assembled core is free from distortion.
4.26.4 Adequate oil ducts shall be provided in the core for cooling. Tinned copper
strip bridging pieces shall be used for maintaining electrical continuity
wherever the magnetic circuit is provided into pockets by such ducts or
insulating material thicker than 0.25mm.
4.26.5 There shall be no movement of the core assembly relative to the tank during
transport, installation as well as in service due to sudden jerks caused by
short circuits and fluctuating loads.
4.26.6 All steel sections used for supporting the core shall be thoroughly sand
blasted or shot blasted after cutting, drilling and welding. Any non-magnetic or
high resistance alloy shall be of established quality.
4.26.7 Adequate lifting lugs shall be provided to enable core and winding to be lifted.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.26.8 The supporting framework of the Cores shall be so designed as to avoid the
presence of pockets which would prevent complete emptying of the tank
through the drain valve, or cause trapping of air during filling.
4.26.9 The insulation structure for the core to bolts and core to clamp plate shall be
such as to withstand a voltage of at least 2kV AC for one minute.
(b) Flux Density
4.26.10
The primary voltage variation, which may affect the flux density at
every tap, shall be kept in view while designing the transformer.
4.26.11
The transformer shall be so designed that the working flux density shall
not exceed 1.6 Tesla at normal voltage, frequency & ratio. Tenders with
higher flux density than specified shall not be considered.
4.26.12
Tenderers shall indicate the continuous allowable maximum flux for
one minute and five seconds.
4.26.13
The limit of flux density at which core material used saturates shall
also be stated in the tender. The name and grade of core material shall be
stated in the tender.
4.26.14
The successful tenderer shall be required to furnish magnetization
curve of the core material, design calculations and such other
data/documents deemed fit by the purchaser for being satisfied that flux
density is as desired.
NOTE: The above flux density has been specified to meet with the over
fluxing of the core due to temporary over voltage of the orders of 25%
for one minute and 40% for five seconds that may appear in abnormal
conditions such as the one obtained following sudden loss of large
loads.
4.27
Losses, Regulation and Impendence
4.7.1 Losses of the transformer shall be stated and shall be subject to tolerances in
accordance with IEC 60076. The fixed losses shall be as low as is consistent
with good design, reliability and economical use of materials.
4.7.8 Voltage regulation from no-load to continuous rated output at unity power
factor, at 0.8 lagging and 0.8 leading power factor with constant voltage
across the higher voltage windings shall be stated in the bid.
4.7.9 The impedance voltage at extreme tappings and at principal tapping shall be
stated and shall be subject to tolerances in accordance with IEC 60076.
Typical values for existing transformers in KPLC at principal (nominal) tap are
9.8% - 10.1%. The minimum as per IEC 60076-5 for this size of transformer is
8.0%.
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4.7.10 As a minimum, the short-circuit apparent power of the system shall be taken
as 10,000MVA (as per IEC 60076-5) in order to obtain the value of the
symmetrical short circuit current to be used for the design and tests.
4.28
Terminals: Arrangement & Bushings
4.8.1 The 33kV and 11kV windings shall be brought out separately through open
bushings of outdoor, weatherproof design in accordance with IEC.
4.8.2 Bushings for 33kV terminals shall be of the solid porcelain type or condenser
type (due to insulation withstand requirements). Bushings for 11kV terminals
shall be of the solid porcelain type.
4.8.5 The neutral bushing of the transformer shall be identical to the corresponding
phase terminal bushings.
4.8.4 Spacing and air clearances shall be so co-ordinated as to render the
probability of a flashover from the terminal of one winding to the terminal of
another winding negligible.
4.8.5 Leakage distance of bushings shall not be less than 31mm/kV, based on
operating phase to phase voltage.
4.8.8 Bushing terminals shall be clamp type suitable for both copper and aluminium
Busbars of sizes upto 76mm diameter.
4.8.11 Each bushing of the 33kV windings shall be mounted on a turret. Each turret
shall be suitable for accommodating at least two sets of current transformers.
4.8.12 Each bushing of the 11kV windings shall be mounted on a turret. Each turret
shall be suitable for accommodating at least three sets of current
transformers.
4.8.9 Terminal arrangement on the HV and LV sides shall be N, A, B, C and n, a,
b, c respectively (this shall be indicated on drawings submitted for approval
before manufacture).
4.29
Current Transformers to be Fitted
4.9.1. Current transformers shall be installed in the bushing turrets and shall be of
the following quantities, ratios, ratings and class:
PHASE
HV-side
(33kV)
A
CORE
BURDEN
RATIO
CLASS
1
2
15VA
15VA
400/1A
400/1A
cl. 5P10
cl. X
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Chapter 4: Technical Specification for Power Transformers
B
C
N
LV-side
(11kV)
a
b
c
n
1
2
3
1
2
-
15VA
15VA
10VA
15VA
15VA
-
400/1A
400/1A
400/?
400/1A
400/1A
-
cl. 5P10
cl. X
cl. 1
cl. 5P10
cl. X
-
1
2
3
1
2
3
4
1
2
3
4
1
2
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
15VA
10VA
15VA
15VA
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/1A
1200/?
1200/1A
1200/1A
cl. 0.5
cl. 5P10
cl. X
cl. 0.5
cl. 5P10
cl. X
cl 0.5
cl. 0.5
cl. 5P10
cl. X
cl 1.0
cl. X
cl. 5P10
4.9.2 Current transformers of suitable rating and class for winding temperature
indicators shall be installed to adequately cover the transformer (HV & LV) as
indicated above (as 400/? and 1200/?) for guidance.
4.9.3 Current transformers shall also comply with the requirements of IEC 60044.
4.9.4 Full technical particulars of current transformers offered, including type test
reports from an International reputable Testing Authority or a National
Standards and Testing Authority of the country of manufacture, shall be
submitted with tender.
4.30
AIR CLEARANCE
4.10.6 When totally assembled, as in service, electrical clearances in air shall be
adequate to withstand the assigned impulse withstand test voltages.
4.10.7 Care shall be taken to ensure that all fittings are suitably positioned so as not
to interfere with the external connection to the bushing terminals.
4.10.8 Minimum external air clearances shall be as shown under.
Nominal System Voltage between Phases
11kV
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Section VI Schedule of Requirements
Minimum clearance phase-to-earth and
phase-to-neutral
mm
300
485
Minimum clearance phase-to-phase
between phases of the same winding
mm
300
485
Minimum clearance between a line terminal
of the high voltage winding and a line
terminal of a lower voltage winding
mm
300
485
Minimum clearance from live metal to oil
pipe-work including conservator and
pressure relief device
mm
300
485
4.11. INSULATION LEVELS
The complete transformer arranged for service, shall be capable of
withstanding the following voltages and shall comply fully with the
requirements of IEC 60076 Part 3, including the latest amendments.
Nominal
system
voltage
Highest
system
voltage
Lightning
Impulse
withstand
voltage, dry
Power
frequency
withstand
voltage, wet
(kV, rms)
33
11
(kV, rms)
36
12
(kV, peak)
(kV, rms)
200
95
95
38
4.12. ON LOAD TAP CHANGER AND MECHANISM BOX
4.12.3 The transformer shall be complete with vacuum type on-load, electrically
driven tap changing mechanism of the high-speed resistor transition type, and
shall comply with the requirements of IEC 60214, 60512 and this
specification. The equipment shall be suitable for remote operation from a
control panel supplied with the transformer as well as for local operation from
the Motor Drive Unit (MDU) mounted on the transformer body.
4.12.4 The mechanism shall be so designed as to ensure that when a tap change
operation is in progress, it shall be able to complete the task independently
irrespective of operation of any relays or switches.
4.12.3 Adequate means shall be provided to safeguard the transformer and its
auxiliary circuits from damage should a failure of the auxiliary supply or any
other mal-operation occur during the progress of tap changing that may
prevent it from completing its task.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
4.12.4 Means shall be provided in the marshalling kiosk for mechanical isolation of
the supply to the Motor Drive Unit, and a suitable thermal overload device
(details to be submitted with tender) shall be provided in the MDU for the
protection of the motor. The possibility of over-running the mechanism at
each end of the voltage range shall be prevented by means of limit switches
and mechanical stops. Other techniques used to prevent tap changer
runaway shall be indicated.
4.12.5 A mechanically operated device shall be provided to indicate the tap position
locally, and a suitable tap position transmitter shall be provided for the remote
tap position indication.
4.12.6 A counter shall be provided on the tap changing mechanism box to indicate
the total number of operations completed by the equipment.
4.12.7 Contactors and associated equipment for the control circuit for local/remote
and manual operations of the tap changer mechanism shall be housed in the
mechanism box.
4.12.12
The tap changer shall be housed in a separate compartment and
shall be Vacuum Type. Sufficient documentation for the vacuum switch in
form of manuals, instructions, drawings, technical characteristics, copies of
type test certificates and type test reports (from an Independent and ISO/IEC
17025 accredited Testing Laboratory), manufacturing and export experience
of the supplier shall be submitted with the tender for technical evaluation. The
tap changer shall be of a design & make approved by KPLC.
4.12.13
The Motor Drive Unit shall have the following in addition to what has
been stated above:
(c)
Isolating switch in the transformer marshalling box for the supply to the
tap changer Motor Drive Unit,
(b)
Raise/lower contactors for tap changer motor operation, and associated
single-phase protection/overload relay,
(c)
Switch for selection of local/remote tap changer control,
(d)
Switch or switches for local tap changer operation,
(e) Provisions shall be made available for hand operation in the mechanism
box.
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4.12.10 The tap changer shall be of internationally reputable manufacture and
proven reliability in service. Detailed documentation and copies of
certificates shall be submitted with the tender for evaluation.
4.12.11 Remote Tap Changer Control Panel
The remote tap changer control panel shall contain the following devices:











Automatic Voltage Regulating Relay (to be of KPLC approved design and
technical details shall be submitted with tender).
Off/Manual/Automatic switch for the Relay.
Raise /Lower control switch.
Raise , Lower, ‘out of step’ and tap change in progress indication lamps
Dial type Tap position indicator (technical details to be submitted with the
tender).
Master/Follower/Independent Scheme and selector switch. The Tap
Changer shall employ, negative reactance or circulating current principle
scheme for parallel operation with other three similar transformers but of
different rating.
Local /Remote switch
KV meter (technical details to be submitted with the tender)
Door operated lamp and anti-condensation heater.
Heater switch ON/OFF to control anti-condensation heater
Various control circuits controlled by Miniature Circuit Breakers
4.12.12 AUTOMATIC VOLTAGE REGULATING RELAY
The relay shall be of KPLC approved make & design and shall, as a minimum,
incorporate the following features:
 Rated voltage 110V AC.
 Rated Current 1 Amp.
 Initial time delay range 5-100 seconds, and ability to select Integrated
delay or Definite time delay.
 Inter-tap delay 1-80 seconds
 Relay voltage setting, adjustable in steps of 1V from 85 - 130V
 Line drop compensation 0-20 V at rated current for both reactive and
resistive setting
 Under voltage inhibit range 70%-90% & over current inhibit range 150%250%
 Bandwidth range 0.5-5 % of voltage level
 Over voltage inhibit
 The AVR should have a selector switch with OFF/Manual/Auto
 Should be of Numeric Design.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
 The Relay shall be Designed to employ both Circulating Current
Compensation or Negative(Reverse) Reactance compounding to minimize
circulating current for Parallel Transformer Operation.
 Tap changer Maintenance, by maintaining Tap Operation count.
 Tap Changer Mechanism Failure.
Sufficient documentation in form of price, instruction manuals,
drawings, technical characteristics and test certificates from
international/national testing/standards laboratory of the country of
manufacture shall be submitted with the tender to facilitate technical
evaluation.
4.13. PARALLEL OPERATION
4.13.1 A scheme for operating this transformer in parallel with other similar units of
different rating shall be provided and wired in the marshalling kiosk (box) by
the manufacturer ready for interphasing.
4.13.2 The scheme shall maintain the transformers in stable parallel operation and
limit circulating current to a minimum.
4.13.3 In the event of this transformer being disconnected from the system, its
reconnection shall not result in its tap changer failing to operate automatically
because of tapping discrepancy.
4.13.4 Suitable selector switch shall be provided, so that any one transformer of the
group can at a time be selected as “Master”, “Follower” or “Independent”.
4.13.5 Necessary interlock blocking independent control when the units are in
parallel shall be provided.
4.13.6 The scheme shall be such that only one transformer of a group can be
selected as “Master”.
4.13.7 An out –of- step device shall be provided for each transformer which shall be
arranged to prevent further tapchanging when transformers in a group
operating in “Parallel control” are one tap out-of-step.
4.14.
MARSHALLING KIOSK (Box)
4.14.1 The marshalling kiosk shall be of outdoor, IP 55, weatherproof, verminproof type with a hinged, lockable door fitted with a glass panel to facilitate
reading of oil and winding temperature gauges without opening the door. The
kiosk shall be mounted so that its window is approximately 1600mm above
ground level; and shall accommodate at least the following items:-
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a)
Winding temperature indicator for both HV and MV with a maximum
pointer drag hand type with a resetting knob and three separately
adjustable mercury contacts for alarm, trip and operation of cooler
control circuits as required.
b)
Oil temperature indicator with a maximum pointer drag hand type with
a resetting knob and two separately adjustable mercury contacts for
alarm and trip.
c)
Mechanical isolating switch for the incoming 3 phase, 4 wire, 415V
50Hz supply to the marshalling kiosk. 415 volts and 240 volts socket
outlets (square pins) shall also be provided in the kiosk.
d)
A mechanical isolating switch for the outgoing 3 phase 4-wire 415V
50Hz supply to the OLTC Motor drive unit.
e)
Suitable starters for the cooling fan motors complete with thermal
overload/single phase protection relay and normally-closed electrical
auxiliary contacts for motor failure alarm/trip circuits.
f)
A selector switch with ‘OFF’, ‘HAND’ and AUTO positions for cooling
fan motors
g)
An internal standard screw type illumination lamp and heater for the
kiosk with respective switches. The lamp shall be door switch
operated.
h)
Wiring, fuses, links, terminal boards and cable glands for bottom entry
of multicore cables.
i)
Anti-condensation heater with a switch.
j)
Thermostat for anti-condensation heater control.
k)
Hygrostat for anti-condensation heater control.
l)
MCB control for each of the circuits.
m)
Phase sequence relay for detection of wrong phase rotation for the
supply to the fans and the OLTC Motor Drive Unit.
Detailed technical details, drawings, and schematics shall be submitted with
the tender documents for evaluation.
4.15. AUXILIARY SUPPLIES
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Equipment shall be rated for the following auxiliary power supplies:
(i)
Cooler control circuits:
240 V, single phase, 50Hz
(j)
Tap changer control:
240 V, single phase, 50Hz
(k)
Cooling fan motors:
415 V, three phase, 50Hz
(l)
Tap changer motor:
415 V, three phase, 50Hz
4.16. TRANSFORMER TANK AND TANK COVER
4.16.1 The tank shall be of top cover design and shall be constructed of mild steel
plates of sufficient thickness and strength and shall be complete with all
accessories. It shall be designed so as to allow the complete transformer
when filled with oil to be lifted by crane or jacks, transported by road, rail or on
water without overstraining any joints and without causing subsequent
leakage of oil. The minimum thickness for sides, bottom and top cover shall
be 8mm, 20mm and 20mm respectively
4.16.2 The base of the tank shall be so designed that it shall be possible to move the
complete transformer unit in any direction without injury when using rollers,
and/or
plates
4.16.3 The tank and its accessories shall be so designed as to prevent collecting or
trapping of gases. Where this cannot be avoided, pipes shall be provided to
vent the gas into the main expansion pipe. The vent shall have a minimum
outside diameter of 19mm except for short pipes which may be 6.35mm
minimum inside diameter.
4.16.4 All joints, other than those that may have to be broken shall be welded.
Caulking of unsatisfactorily welded joints is forbidden.
4.16.5.The main tank body shall be pressure tested and a certificate issued by the
national standards and testing laboratory ascertaining the soundness of all
welded joints. A certified copy of the certificate shall be submitted with the
tender for evaluation.
4.16.6 Tank shall be provided with lifting lugs suitable for lifting the complete
transformer with oil. Further more, a minimum of four accessible jacking
positions shall be provided to enable the complete transformer to be raised or
lowered using jacks.
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4.16.7 The transformer tank and all attachments normally under oil shall be capable
of withstanding full vacuum. The oil conservator shall withstand at least 35%
full Vacuum.
4.16.8 Tank cover shall be of such a design and construction as to prevent
accumulation of water and shall be bolted to the flange on the tank top to form
a weatherproof joint.
4.16.9 Inspection openings shall be provided as necessary to give easy access to
bushings, tapping switch and for testing or general inspection.
4.16.10 Tank cover and inspection covers shall be provided with suitable lifting
arrangements. Inspection covers shall not weigh more than 25 kg apiece.
4.16.11 The tank cover shall be fitted with isolated pockets for oil and winding
temperature instrument bulbs. Protection shall be provided where necessary
for each capillary tube. The pocket shall be fitted with a captive screwed cap
to prevent the ingress of water. Detailed drawings shall be provided.
4.16.12 The pocket shall be located in a position of maximum oil temperature at
continuous
maximum rating and it shall be possible to insert and remove the instrument
bulbs
without lowering the oil in the tank.
4.16.15 Gaskets for weather and oil-tight joint faces shall be of synthetic rubber-andcork
composition and shall have a minimum thickness of 5mm, except that
where
jointing faces are precision-machined thinner gaskets may be used.
4.17. PAINT WORK
Cleaning and painting shall be in accordance with the following
requirements. Any deviations in methodology shall be stated and
may only be those that will produce demonstrably superior results.
A test report issued by the national standards and testing laboratory shall
be produced at the time of acceptance testing of the transformer.
4.17.1 Tanks and Accessories
(g)
External and internal surfaces of all transformer tanks and chambers and
other fabricated steel items shall be cleaned of scale, rust and surface
dirt by blast cleaning or other suitable approved method. After cleaning,
these surfaces should be immediately covered with paint.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
(h)
The exterior shall be thoroughly cleaned by shot blasting or other
approved method and given priming coat followed by two coats of
contrasting colours of durable weather-resisting paint. The final coat
shall be high gloss of shade No. 632 (Admiralty Grey) according to BS
381C.
(i)
The interior of all transformer tanks and other oil-filled chambers shall be
cleaned of all scale and rust by shot blasting or other approved method.
Hot oil resistant varnish on white synthetic enamel paint is to be used for
painting the inside of all oil filled chambers, including transformer tanks
and CT chambers & covers. The final coat shall be of a light-coloured
anti-condensation finish.
4.17.2 Radiators
(e)
Radiators shall be thoroughly degreased and treated externally by
phospating and/or other rust-inhibiting process.
(f)
Radiators shall be flood-painted with a primer and two coats of durable
weather and oil resisting paint. The final external coat shall be high gloss
of shade No. 632 (Admiralty Grey) according to BS 381C. The total
paint thickness shall not be less than 85μm at any point.
4.18. COOLING SYSTEM
4.18.1 Radiators shall be supplied in banks as suitable. Each bank shall be fitted
with gate valves with legible labelling for OPEN/CLOSED positions and used
for full isolation from the main tank. Each radiator shall have a top and
bottom isolating butterfly valve. The radiator design shall exclude
accumulation of rainwater.
4.18.6 Radiator banks shall be mounted directly to the transformer main tank for best
use of space.
4.18.7 Each radiator shall have a bleeding facility (to allow escape of air) on top.
4.18.4 Separately mounted a-c motor driven fans fitted with wire mesh guards shall
be provided for the radiators.
The fan motors shall be totally enclosed,
weatherproof, outdoor type suitable for continuous operation and shall be
fitted with terminal boxes and glands to accommodate multicore electric
supply cables. Technical details of the fan motor shall be supplied with the
tender.
4.18.5 Suitable starters, protection/warning devices, contactors and switches for the
motors shall be provided as stipulated in clause 4.14 above.
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Section VI Schedule of Requirements
4.18.6 Suitable lifting lugs shall be provided for removal and assembly of radiators.
4.18.7 The complete cooling system and the fittings shall be fully co-ordinated.
Where necessary, the cooling fan motors shall be fired in designed groups
and in such sequence as to achieve the desired control at maximum
efficiency and safety.
4.19. FITTINGS
4.19.1 Conservator
The transformer shall be provided with a conservator having a filling
orifice, an isolating valve, a drain valve and a cobalt free
dehydrating breather (with oil seal) which shall be accessible from
ground level. The drain pipe shall be located at the lowest point in
the conservator in its final installed position and welded such that it
can drain all the sludge in the conservator.
The conservator shall be partitioned proportionately to separate the main
tank oil and the tapchanger oil. Each compartment to be fitted with
a breather and an oil level indicator with electrical contacts for
alarms. The conservator complete with drain valve shall be in such
a position as not to obstruct the electrical connections to the
transformer. An oil gauge shall be provided at one end of the
conservator marked with oil levels that can be read by a person
standing on the ground. Expansion joints may be provided in the
inlet and outlet pipes to the transformer as necessary.
4.19.2 Gas and Oil Actuated Relay (Transformer main tank)
Transformers shall be provided with a gas and oil actuated relay (Buchholz
relay) of double float type with tripping contacts to detect accumulation of gas
and sudden changes of oil pressure. Shut off valves and flange couplings
shall be provided to facilitate easy removal of the relay without lowering oil
level in the main tank. A bleed valve for gas venting, a test valve and a
terminal box suitably wired to the marshalling kiosk shall also be provided.
The gas venting pipe shall be brought down to a height reachable from
ground level and shall be fitted with a gas sampling device at the end.
Provision should be made on the relay for simulation of gas and oil surge for
testing purposes.
4.19.3 Gas and Oil Actuated Relay (Tap changer compartment)
Tap changer compartment shall be provided with a gas and oil actuated relay
(Buchholz relay) of double float type with tripping contacts to detect
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
accumulation of gas and sudden changes of oil pressure. Shut off valves and
flange couplings shall be provided to facilitate easy removal of the relay
without lowering oil level in the tap changer compartment. A bleed valve for
gas venting, a test valve and a terminal box suitably wired to the marshalling
kiosk shall also be provided. The gas venting pipe shall be brought down to a
height reachable from ground level and shall be fitted with a gas sampling
device at the end. Provision should be made on the relay for simulation of gas
and oil surge for testing purposes.
4.19.3 Pressure Relief Device
A pressure relief device shall be provided for the main tank, complete with trip
contacts suitably wired to the marshalling kiosk. The device shall be
resettable after an operation. Details of the device shall be submitted with the
offer.
4.19.4 Winding Temperature Indicator
(m) The transformer shall be provided with winding temperature indicator,
maximum indicator and associated current transformers. The
temperature indicator shall have a scale ranging from 20°C to 150°C,
preferably uniformly divided and its type to be stated in the bid. The
indicator shall have two sets of independently adjustable contacts as
follows:
(i) Alarm
Adjustable setting: 70°C to 150°C
Fixed differential: Not more than 10°C
(ii) Trip
Adjustable setting: 70° to 150°C
Fixed differential:
Not more than 10°C
(n)
All contacts shall be adjustable to a scale and shall be accessible on
removal of the cover for dial type devices. For purposes of (i) and (ii)
above, the contacts shall be suitable for making or breaking 150VA
between the limits of 30 and 250 V a.c. or d.c., and making 500 VA
between the limits of the 110 and 250 V d.c.
(o)
Isolating and test links shall be provided in a control cubicle to allow for
measuring the oil temperature and testing the heater coil.
(p)
The current transformer providing winding temperature indication shall
be located at the discretion of the manufacturer, in the best position for
the duty.
(q)
Calibration of indicator shall be related to the winding having the
maximum temperature rise.
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Section VI Schedule of Requirements
(r)
If the value on the winding temperature indicator varies by more than
3°C from the values derived from the tests specified in clause 5, then
adjustments shall be made to the equipment to achieve these limits.
4.19.5 Oil Temperature Indicator
Transformers shall be provided with an oil temperature indicator with a
maximum pointer and contacts for alarm and trip signals, similar to
winding temperature indicator above.
4.20. ACCESSORIES
The following shall be provided:
4.20.1 Valves with blank flanges fitted at the top and bottom for oil filtration
purposes, having the following features:
(i)
The valve located at the bottom of the tank shall also be suitable for
draining oil from the transformer tank.
(j)
All valves shall close with a clockwise rotation. The main inlet and outlet
valves shall be provided with “open” and “closed” position indicators,
visible from ground level.
(k)
All valves shall have provision for padlocking in the open and closed
position for operation purposes. The hole for the padlock shall have a
clearance of not less than 8mm and not more than 10mm. Locking pin
shall be of anti-rattle design to limit noise emissions. The locking
padlocks shall be provided.
(l)
Closed/Open positions of all valves must be clearly marked.
4.20.2 Oil sampling device appropriately located to obtain samples of transformer oil
from the top and bottom of the tank.
4.20.3 Two earthing terminals located at diagonally opposite corners of the tank.
4.20.4 Air release valves or plugs for the main tank, suitably located.
4.20.7 Non-deteriorating detailed diagram and rating plates.
4.20.6 Other Fittings/accessories
Diagram plate
Plate of valves and oil piping.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
Motor drive electrical and protection diagram.
Cooling control electrical and protection diagram.
Electrical scheme for operating this in parallel with other similar units.
Detailed list of the transformer equipment & fittings including their drawings,
brochures & instruction manuals.
Shipping data
Detailed erection, installation, operation and maintenance manuals in English
language.
Testing Plan.
Impact recorder for the whole duration of transit and a report provided
afterwards.
2 Sets of keys for padlocking devices.
(all control boxes as well as valves to be padlocked)
4.21. TRANSFORMER OIL
The transformer and all associated oil immersed equipment shall be supplied oil
filled. The oil shall comply with all the requirements of IEC 60296 (class 1: uninhibited oil). Tenderer shall provide the chemical composition and properties of the
oil and the replacement cycle over the expected life of the transformer.
4.22. CAPITALIZATION
4.22.5 Transformer losses shall be capitalized at the following rates to facilitate
evaluation and comparison of tenders.
Total load losses, ONAF rating (copper
loss + stray loss) at rated current at 750
C in KW, including auxiliary losses
Total no load losses in KW (core loss +
dielectric loss)
US$ 1070 per kW
US$ 4300 per kW
Losses will be capitalized at the above rates and added to the bid price
according to the formula below:
Gep = Gbp + G($), where Gep = Bid evaluation price, Gbp = Bid price
and
G($) = Adjustment for the cost of the operation
G($) is obtained by using the following formula:
G($) = US$ 1070 X {Total load losses, ONAF rating (copper loss + stray
loss) at rated current at 750 C in KW, including auxiliary losses} + US$ 4300
X {Total no load losses in KW (core loss + dielectric loss)}.
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4.22.6 The guaranteed transformer losses used in the above capitalization formula
shall be the maximum allowed and no plus tolerance shall be allowed during
acceptance testing.
4.23. QUALITY MANAGEMENT SYSTEM
4.23.1 The bidder shall submit a quality assurance programme (QAP) that will be
used to ensure that the transformer design, material, workmanship, tests,
service capability, maintenance and documentation, will fulfil the requirements
stated in the contract documents, standards, specifications and regulations.
The QAP shall be based on and include relevant parts to fulfil the
requirements of ISO 9001:2008.
4.23.2 The Manufacturer’s Declaration of Conformity to reference standards and
copies of quality management certifications including copy of valid and
relevant ISO 9001: 2008 certificate shall be submitted with the tender for
evaluation.
4.23.3 The bidder shall indicate the delivery time of each type of transformer,
manufacturer’s monthly & annual production capacity and experience in the
production of the type and size of transformer being offered. A detailed list &
contact addresses (including e-mail) of the manufacturer’s previous
customers outside the country of manufacture for exact or similar rating of
transformers sold in the last five years shall be submitted with the tender for
evaluation.
17.
TESTS AND INSPECTION
5.7 The transformer shall be inspected and tested in accordance with the
requirements of IEC 60076 and this specification. It shall be the responsibility of
the manufacturer to perform or to have performed all the tests specified.
Tenderers shall confirm the manufacturer’s capabilities in this regard when
submitting tenders. Any limitations shall be clearly specified.
5.8 Copies of Type Test Certificates and Type Test Reports issued by the relevant
Independent International or National Testing/ Standards Authority of country of
manufacture or ISO/IEC 17025 accredited and independent testing laboratory
shall be submitted with the offer for evaluation (all in English Language). A copy
of the accreditation certificate for the independent laboratory shall also be
submitted. Any translations of certificates and test reports into English language
shall be signed and stamped by the Testing Authority.
1) Copies of type test certificates and type test reports for the transformer to
be submitted for tender evaluation shall include:
g) Dielectric tests to IEC 60076 (Lightning Impulse and Power Frequency
Withstand Tests).
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
h) Short circuit withstand test to IEC 60076.
 thermal ability of the transformer to withstand short circuit,
 ability of the transformer to withstand the dynamic effects of short
circuit
i) Temperature rise test to IEC 60076.
Note: Temperature rise test to IEC 60076 if conducted at the manufacturer’s
premises (factory) MUST be in the presence of representatives of ISO/IEC
17025 accredited and independent testing laboratory; who shall sign the
certificates and test reports.
2) Copies of type test certificates and type test reports for the on load tap
changer to be submitted for tender evaluation shall include:
m) Dielectric tests (Lightning Impulse and Power Frequency Withstand
Tests).
n) Short circuit withstand test.
o) Temperature rise test.
p) Switching tests.
q) Transition impedance test.
r) Mechanical tests.
5.9 The transformer shall be subject to acceptance tests at the manufactures’ works
before dispatch. Acceptance tests shall be witnessed by two Engineers
appointed by The Kenya Power and Lighting Company Limited (KPLC) and shall
include the following:
5.3.1 Routine tests to IEC 60076 (to be done during acceptance testing at
factory)

Measurement of winding resistance

Ratio test

Vector group

Separate source voltage withstand test

Induced over-voltage

Insulation resistance

Oil leakage test on fully assembled transformer for 12 hours

Measurement of impedance voltage

Magnetic balance

Measurement of no-load loss and current

Measurement of load loss (at normal & extreme taps)
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Section VI Schedule of Requirements

Tests on on-load tap-changer

Tests on on-load tap-changer remote control panel

Efficiency at 50%, 75%, 100% loading at unity p.f and rated terminal
voltage (Corrected to 75C)
5.3.2 Type Tests to IEC 60076 (to be done during acceptance testing at
factory)


Temperature rise test – To be performed on one unit during acceptance
testing.
Lightning impulse withstand voltage test – To be performed on one unit
during acceptance testing.
5.3.3 Additional tests (to be done during acceptance testing at factory)













5.10
Visual Inspection (verification of auxiliaries, fittings & accessories,
markings & nameplates, paintwork, workmanship and finish)
Measurement of power taken by the fans
Insulation dissipation factor
Condenser bushing capacitance and tan delta
DGA (dissolved gas analysis) of the insulating oil.- To be performed
before and after temperature rise test
Acoustic and sound level
Insulation tests on the auxiliary wiring in the marshalling boxes
Measurement of zero sequence impedance
Measurement of harmonics no-load current
CT ratio and polarity
Measurement of zero phase sequence impedance
Paint thickness
Tank pressure test
Testing Facility
5.10.1 The bidder shall provide current e-mail address, fax and telephone numbers
and contact person at the Testing Authority where Type and Special Tests to
IEC 60076 were carried out.
5.10.2 All test and measuring equipment to be used during acceptance testing shall
have been calibrated and copies of valid calibration certificates shall be
provided to KPLC Engineers. A detailed list of workshop tools, test/measuring
equipment and list of tests to IEC 60076 that can be carried out by the
manufacturer shall be submitted with the tender for evaluation.
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
5.11 Test reports for each transformer (including its individual components) shall
be submitted to The Kenya Power and Lighting Company for approval before
shipment.
5.12 On receipt of the transformer, KPLC will inspect it and may perform or have
performed any of the relevant tests in order to verify compliance with the
specification. The manufacturer shall replace/rectify without charge to KPLC,
equipment which upon examination, test or use fail to meet any or all of the
requirements in the specification.
18.
MARKING, LABELLING AND PACKING
6.9
The transformer and associated components shall be packed in a manner as
to protect it from any damage in transportation and handling. It shall be
dispatched oil-filled and fully wired. All piping shall follow the contour of the
transformer as closely as possible to avoid damage during transportation and
handling. Auxilliary equipment and accessories/fittings shall be protected
against mechanical damage and oil vandalism.
6.10
Each assembly and package of items associated with the transformer shall be
suitably marked for ease of identification.
6.11
In addition to markings and labels required elsewhere in the tender &
specification, each equipment and component shall be marked in accordance
with the relevant IEC standard. Each transformer shall be provided with a
rating plate of weatherproof material, fitted in a visible position, showing the
appropriate details listed in IEC 60076. The entries on the plate shall be
indelibly marked (either by etching, engraving or stamping).
6.12
In addition, the name plate shall include load and no load losses for the
highest, lowest and principle tap positions, temperature class of insulation,
connection diagram and the inscription 'PROPERTY OF THE KENYA
POWER AND LIGHTING CO.' all marked indelibly as in 6.4.
----------THIS SPACE LEFT BLANK----------
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Section VI Schedule of Requirements
Annex A
SCHEDULE OF GUARANTEED TECHNICAL
TRANSFORMER OFFERED
No.
Requirements
1.
Name of the manufacturer and country of
origin
2.
Conforming to standard
3.
Service (indoor/outdoor), altitude,
temperature range, humidity and
environment (pollution severity level)
4
Rating
a)
1. With ONAN cooling, MVA
2. With ONAF cooling, MVA
b)
Rated no load voltage
HV-kV
LV-kV
5.
Temperature rise of top oil (deg.C)
6.
Temperature rise of winding measured by
resistance.
7.
i)
With ONAN cooling (deg. C)
ii)
With ONAF cooling (deg. C)
iii)
load
Period of operation of transformer at full
without calculated winding hot spot
temperature exceeding 140C and with
a. 50% coolers off
b. 100% coolers off
Rated frequency (Hz)
8.
No. of windings
9.
Number of phases
10.
Connection symbol & vector group
11.
Tappings:
i)
ii)
Type of tap changer
Tap step (percent)
PARTICULARS
FOR
BIDDER’S OFFER
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
iii)
Total tap ranges - (+) percent to (-)
percent
iv)
12.
Tappings provided at
required)
(HV-N
Magnetization data at no load, at 90%
rating, at 100% rating and at 110% rated
voltage and load and frequency
i) Current in Amps
ii) Power factor
iii) Total no load losses in KW (core loss +
dielectric loss)
13.
Total load losses (copper loss + stray loss)
at rated current at 750 C in KW
i)
For ONAN Rating
ii) For ONAF Rating (including
auxiliary losses)
iii) Auxiliary Losses
14.
% impedance voltage at rated current and
frequency at 750 C.
i) Positive sequence at normal tap in %
ii) Positive sequence at Max. Voltage tap in
%
iii) Positive sequence at Min. voltage tap in
%
iv) Minimum short-circuit apparent power
v) symmetrical short circuit current
15.
16.
Reactance per phase at rated frequency at
normal tap on rated MVA base: HV to LV - %
Resistance at 750 C of:
HV Winding in ohms (at principle & extreme
taps)
LV Winding in ohms
17.
Efficiency at 750 C taking in to account input of
cooling plant loss:
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Section VI Schedule of Requirements
At Unity Power Factor and at 0.8 Power
Factor Lagging:
i) At 125% full load
ii) At 100% full load
iii) At 75% full load
iv) At 50% full load
18.
Regulation at full load & at 750 C
i)
ii)
19.
At unity p.f. in %
At 0.8 p.f. (lag) in %
a) Short time thermal rating of HV winding
in kA
and duration in seconds
b) Short time Thermal rating of LV winding
in kA
& duration in seconds
20.
a) Overload capacity for 2 hours after
continuous
full load run
b) Thermal time constant in hours
21.
a)
Test Voltages at factory:
i) Lightning impulse kV (peak)
ii) Power frequency voltage withstand kV
(rms)
ii) Altitude of factory
b) Voltage to earth for which star point will
be insulated.
i)
ii)
Impulse kV (Peak)
Power frequency (kV)
22.
Noise level when energized at normal
voltage and normal frequency at no load.
23.
Approximate weights
i)
Core (kg)
ii) Windings (kg) (Copper + Insulation)
(separately)
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
iii)
Tank & Fittings (kg)
iv)
v)
Oil (kg)
Total weight (kg)
24.
Details of oil and quantity in liters
25.
Net core area in sq. meters
26.
Type of transformer (stacked core type
required)
27.
Material of Laminations
28.
i.
Grade of CRGO
ii.
Thickness of lamination
iii.
Stack-factor
iv.
Specific weight/m3
v.
Specific loss watts/kg.
Maximum flux density at rated voltage and
frequency in Tesla/lines/cm2
Conductor area in sq. cm. and current
density in Amps/Sq. cm.
29.
HV
LV
Regulation winding.
Type of windings
30.
HV
LV
31.
Winding insulation type and class, graded
or ungraded
HV
LV
32.
a) Insulating material
i)
Turn insulation
ii)
HV side
iii)
LV side
b) Between HV and LV as applicable.
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Section VI Schedule of Requirements
c) For core bolts, washers and end plates
d) Tapping connection
33.
i)
Type of axial support:HV winding
LV winding
ii)
34.
Type of Radial Coil support :HV winding
LV winding
Clearances in air
Phase to phase HV - HV
HV - LV
LV - LV
Phase to earth
HV - E
LV - E
35.
36.
37.
Details of Tank
i)
Material for tank
ii)
Type of the tank
iii)
Thickness of sides in mm
iv)
Thickness of Bottom in mm
v)
Thickness of Cover in mm
vi)
Thickness of Radiators in mm
Shipping details – List parts normally detached
for transport and indicate protection against
mechanical damage and oil vandals for entire
transformer
Details of Bushings (indicate details for
each)
i)
Type
ii)
One minute dry withstand
frequency voltage kV (rms)
iii)
One minute wet withstand power
frequency voltage kV (rms)
power
iv)
1.2/50s lightning impulse voltage, dry
(kVp)
HV LV
NEUTRAL
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
38.
v)
Total creepage distance in Air (mm)
vi)
Weight of bushings (kg)
vii)
Phase to earth clearance in air of live
parts at the top of bushings.
viii)
Maximum current rating of each bushing
ix)
Quantity of oil in the bushings in liters
On load tap changer (OLTC)
i)
Manufacturer and Type & Model No.
ii)
Rating
iii)
Rated voltage
kV
iv)
Rated current
Amps
v)
Step voltage
kV
vi)
No. of steps
No.
vii)
Approximate over all dimensions (Width
x Breadth x Depth) in mm
viii)
Approximate overall weight in kg.
ix)
Time to complete one tap change step
in seconds
x) List technical documents including type test
certificates and type test reports,
manufacturing experience, sales records,
installation instructions and manuals and
manufacturer’s authorization submitted for
the OLTC offered.
39.
Cooling System:
i)
Grade of oil
ii) Quantity of oil in Transformer
iii) Weight of oil in Transformer
in litres
in litres
iv) Type and make of material used for
radiators.
v) Total radiating surface
in m2
vii) No. of tubes/fins & copulate dimensions
thereof.
viii) Total weight of Radiators in kg.
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Section VI Schedule of Requirements
40.
Cooling Equipment : Fan motor
i)
ii)
iv)
Make and Type (Details)
Number connected --(No.)
Nos. in standby --(No.)
Rated power ---
v)
Rated Voltage
vi)
Temp. at which control is adjustable
vii)
Capacity in Litres/Minute
iii)
41.
(kW)
Overall dimensions of transformer including
cooling gear, tap changing gear etc.
a)
Length mm
b)
Breadth mm
c)
Height mm
d)
Reference drawing No.
42.
Type and size of oil temperature indicator.
43.
Type of oil level indicator.
44.
Type and size of Gas operated relay.
Type & size of winding temperature indicators.
45.
47.
Ratio and Type of CT used for winding
temperature indicator
Capacity of conservator vessel (Litres)
48.
Type of oil preservative installed
49.
Valve sizes and Numbers required/fitted
46.
50.
51.
i)
drain valves -mm- No.
ii)
filter valves -mm- No.
iii)
sampling valves -mm- No.
Size of Rail gauge for installation in yard
a)
Longer axis
b)
Shorter axis
a)
Type and make of pressure relief device
b)
Minimum pressure at which the device
operates (kPa)
Volume II – Section VI : Employer’s Requirements : Contract15 - 132/33 kV Substations and bays
Chapter 4: Technical Specification for Power Transformers
52.
53.
54.
55.
56.
57.
Make & size of silica-gel breaker.
Manufacturer’s Guarantee and Warranty
List catalogues, brochures, technical data,
drawings submitted to support the offer.
Detailed list & contact addresses of the
manufacturer’s previous customers outside the
country of manufacture for similar transformers
sold in the last five years submitted to support
the offer.
List Type Test Certificates and Type Test Reports
submitted with tender (indicate test report numbers,
date, Independent Testing Institution and contact
addresses)
g) Dielectric tests to IEC 60076 (Lightning Impulse
and Power Frequency Withstand Tests).
h) Short circuit withstand test to IEC 60076.
 thermal ability of the transformer to
withstand short circuit,
 ability of the transformer to withstand the
dynamic effects of short circuit.
i) Temperature rise test to IEC 60076.
Note: Temperature rise test to IEC 60076 if
conducted at the manufacturer’s premises
(factory) MUST be in the presence of
representatives of ISO/IEC 17025 accredited
and independent testing laboratory; who shall
sign the certificates and test reports.
Testing facility (of Detailed
list
of
the manufacturer) manufacturer’s
workshop
tools, test and measuring
equipment
List of tests to IEC 60076
that can be carried out by
the manufacturer
59.
List Acceptance Tests to be
witnessed by KPLC Engineers
at the factory
List test reports (for transformer and components)
to be submitted to KPLC for approval before
shipment
Copy of ISO 9001:2008 Certificate submitted
60.
Quality Assurance Programme
61.
Manufacturer’s Declaration of
Standards (including IEC 60076)
58.
Conformity
to
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Section VI Schedule of Requirements
64.
Deviations from tender specifications and
supporting data, test reports, technical documents
etc.
Inspection of the transformer & components at
KPLC stores/site.
List and details of current transformers to be fitted
65.
Auxiliaries, fittings and accessories to be fitted.
62.
63.
…………………………………………………………………………………………
….
Manufacturer’s Name, Signature, Stamp and Date
PART 3 - Contract
113
Section VII. General Conditions of Contract
Table of Clauses
Definitions ............................................................................................................................ 115
Contract Documents ........................................................................................................... 116
Fraud and Corruption ........................................................................................................ 116
Interpretation ...................................................................................................................... 117
Language.............................................................................................................................. 118
Joint Venture, Consortium or Association ....................................................................... 119
Eligibility.............................................................................................................................. 119
Notices .................................................................................................................................. 119
Governing Law .................................................................................................................... 119
Settlement of Disputes ........................................................................................................ 119
Inspections and Audit by the Bank ................................................................................... 120
Scope of Supply ................................................................................................................... 120
Delivery and Documents..................................................................................................... 120
Supplier’s Responsibilities ................................................................................................. 120
Contract Price ..................................................................................................................... 121
Terms of Payment ............................................................................................................... 121
Taxes and Duties ................................................................................................................. 121
Performance Security ......................................................................................................... 122
Copyright ............................................................................................................................. 122
Confidential Information ................................................................................................... 122
Subcontracting .................................................................................................................... 123
114
Section VII. General Conditions of Contract
Specifications and Standards ............................................................................................. 123
Packing and Documents ..................................................................................................... 124
Insurance ............................................................................................................................. 124
Transportation .................................................................................................................... 124
Inspections and Tests .......................................................................................................... 124
Liquidated Damages ........................................................................................................... 126
Warranty ............................................................................................................................. 126
Patent Indemnity ................................................................................................................. 127
Limitation of Liability ........................................................................................................ 128
Change in Laws and Regulations ...................................................................................... 128
Force Majeure ..................................................................................................................... 128
Change Orders and Contract Amendments ..................................................................... 129
Extensions of Time .............................................................................................................. 130
Termination ......................................................................................................................... 130
Assignment........................................................................................................................... 131
Export Restriction ............................................................................................................... 131
Section VIII. General Conditions of Contract
115
Section VII. General Conditions of Contract
Definitions
1.1
The following words and expressions shall have the meanings
hereby assigned to them:
(a)
“Bank” means the World Bank and refers to the
International Bank for Reconstruction and Development
(IBRD) or the International Development Association
(IDA).
(b)
“Contract” means the Contract Agreement entered into
between the Purchaser and the Supplier, together with the
Contract Documents referred to therein, including all
attachments, appendices, and all documents incorporated
by reference therein.
(c)
“Contract Documents” means the documents listed in the
Contract Agreement, including any amendments thereto.
(d)
“Contract Price” means the price payable to the Supplier
as specified in the Contract Agreement, subject to such
additions and adjustments thereto or deductions
therefrom, as may be made pursuant to the Contract.
(e)
“Day” means calendar day.
(f)
“Completion” means the fulfillment of the Related
Services by the Supplier in accordance with the terms and
conditions set forth in the Contract.
(g)
“GCC” means the General Conditions of Contract.
(h)
“Goods” means all of the commodities, raw material,
machinery and equipment, and/or other materials that the
Supplier is required to supply to the Purchaser under the
Contract.
(i)
“Purchaser’s Country” is the country specified in the
Special Conditions of Contract (SCC).
(j)
“Purchaser” means the entity purchasing the Goods and
Related Services, as specified in the SCC.
(k)
“Related Services” means the services incidental to the
supply of the goods, such as insurance, installation,
training and initial maintenance and other such
obligations of the Supplier under the Contract.
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Section VII. General Conditions of Contract
(l)
“SCC” means the Special Conditions of Contract.
(m) “Subcontractor” means any natural person, private or
government entity, or a combination of the above, to
whom any part of the Goods to be supplied or execution
of any part of the Related Services is subcontracted by
the Supplier.
(n)
“Supplier” means the natural person, private or government
entity, or a combination of the above, whose bid to perform
the Contract has been accepted by the Purchaser and is
named as such in the Contract Agreement.
(o)
“The Project Site,” where applicable, means the place
named in the SCC.
Contract
Documents
2.1
Subject to the order of precedence set forth in the Contract
Agreement, all documents forming the Contract (and all parts
thereof) are intended to be correlative, complementary, and
mutually explanatory. The Contract Agreement shall be read as
a whole.
Fraud and
Corruption
3.1
If the Purchaser determines that the Supplier and/or any of its
personnel, or its agents, or its Subcontractors, consultants,
service providers, suppliers and/or their employees has
engaged in corrupt, fraudulent, collusive, coercive or
obstructive practices, in competing for or in executing the
Contract, then the Purchaser may, after giving 14 days notice to
the Supplier, terminate the Supplier's employment under the
Contract and cancel the contract, and the provisions of Clause
35 shall apply as if such expulsion had been made under SubClause 35.1.
(a)
For the purposes of this Sub-Clause:
(i)
“corrupt practice” is the offering, giving, receiving
or soliciting, directly or indirectly, of anything of
value to influence improperly the actions of
another party7;
(ii)
“fraudulent practice” is any act or omission,
including a misrepresentation, that knowingly or
recklessly misleads, or attempts to mislead, a party
to obtain a financial or other benefit or to avoid an
“Another party” refers to a public official acting in relation to the procurement process or contract execution.
In this context, “public official” includes World Bank staff and employees of other organizations taking or
reviewing procurement decisions.
7
Section VIII. General Conditions of Contract
117
obligation8;
(iii)
“collusive practice” is an arrangement between
two or more parties9 designed to achieve an
improper purpose, including to influence
improperly the actions of another party;
(iv)
“coercive practice” is impairing or harming, or
threatening to impair or harm, directly or
indirectly, any party or the property of the party to
influence improperly the actions of a party10;
(v)
“obstructive practice” is
(aa)
deliberately destroying, falsifying, altering
or concealing of evidence material to the
investigation or making false statements to
investigators in order to materially impede a
Bank investigation into allegations of a
corrupt, fraudulent, coercive or collusive
practice; and/or threatening, harassing or
intimidating any party to prevent it from
disclosing its knowledge of matters relevant
to the investigation or from pursuing the
investigation; or
(bb) acts intended to materially impede the
exercise of the Bank’s inspection and audit
rights provided for under Clause 11
[Inspections and Audits by the Bank].
Interpretation
3.2
Should any employee of the Supplier be determined to have
engaged in corrupt, fraudulent, collusive, coercive, or
obstructive practice during the purchase of the Goods, then that
employee shall be removed.
4.1
If the context so requires it, singular means plural and vice versa.
4.2
Incoterms
(a)
Unless inconsistent with any provision of the Contract,
the meaning of any trade term and the rights and
obligations of parties thereunder shall be as prescribed by
“Party” refers to a public official; the terms “benefit” and “obligation” relate to the procurement process or
contract execution; and the “act or omission” is intended to influence the procurement process or contract
execution.
9
“Parties” refers to participants in the procurement process (including public officials) attempting to establish
bid prices at artificial, non competitive levels.
10
“Party” refers to a participant in the procurement process or contract execution.
8
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118
Section VII. General Conditions of Contract
Incoterms.
(b)
4.3
The terms EXW, CIP, FCA, CFR and other similar terms,
when used, shall be governed by the rules prescribed in
the current edition of Incoterms specified in the SCC and
published by the International Chamber of Commerce in
Paris, France.
Entire Agreement
The Contract constitutes the entire agreement between the
Purchaser and the Supplier and supersedes all communications,
negotiations and agreements (whether written or oral) of the
parties with respect thereto made prior to the date of Contract.
4.4
Amendment
No amendment or other variation of the Contract shall be valid
unless it is in writing, is dated, expressly refers to the Contract,
and is signed by a duly authorized representative of each party
thereto.
4.5
4.6
Nonwaiver
(a)
Subject to GCC Sub-Clause 4.5(b) below, no relaxation,
forbearance, delay, or indulgence by either party in
enforcing any of the terms and conditions of the Contract
or the granting of time by either party to the other shall
prejudice, affect, or restrict the rights of that party under
the Contract, neither shall any waiver by either party of
any breach of Contract operate as waiver of any
subsequent or continuing breach of Contract.
(b)
Any waiver of a party’s rights, powers, or remedies under
the Contract must be in writing, dated, and signed by an
authorized representative of the party granting such
waiver, and must specify the right and the extent to which
it is being waived.
Severability
If any provision or condition of the Contract is prohibited or
rendered invalid or unenforceable, such prohibition, invalidity
or unenforceability shall not affect the validity or enforceability
of any other provisions and conditions of the Contract.
Language
5.1
The Contract as well as all correspondence and documents
relating to the Contract exchanged by the Supplier and the
Purchaser, shall be written in the language specified in the
SCC. Supporting documents and printed literature that are
Section VIII. General Conditions of Contract
119
part of the Contract may be in another language provided they
are accompanied by an accurate translation of the relevant
passages in the language specified, in which case, for purposes
of interpretation of the Contract, this translation shall govern.
5.2
The Supplier shall bear all costs of translation to the governing
language and all risks of the accuracy of such translation, for
documents provided by the Supplier.
Joint Venture,
Consortium or
Association
6.1
If the Supplier is a joint venture, consortium, or association, all of
the parties shall be jointly and severally liable to the Purchaser for
the fulfillment of the provisions of the Contract and shall
designate one party to act as a leader with authority to bind the
joint venture, consortium, or association. The composition or the
constitution of the joint venture, consortium, or association shall
not be altered without the prior consent of the Purchaser.
Eligibility
7.1
The Supplier and its Subcontractors shall have the nationality of
an eligible country. A Supplier or Subcontractor shall be
deemed to have the nationality of a country if it is a citizen or
constituted, incorporated, or registered, and operates in
conformity with the provisions of the laws of that country.
7.2
All Goods and Related Services to be supplied under the
Contract and financed by the Bank shall have their origin in
Eligible Countries. For the purpose of this Clause, origin means
the country where the goods have been grown, mined,
cultivated, produced, manufactured, or processed; or through
manufacture, processing, or assembly, another commercially
recognized article results that differs substantially in its basic
characteristics from its components.
8.1
Any notice given by one party to the other pursuant to the
Contract shall be in writing to the address specified in the
SCC. The term “in writing” means communicated in written
form with proof of receipt.
8.2
A notice shall be effective when delivered or on the notice’s
effective date, whichever is later.
Governing Law
9.1
The Contract shall be governed by and interpreted in
accordance with the laws of the Purchaser’s Country, unless
otherwise specified in the SCC.
Settlement of
Disputes
10.1 The Purchaser and the Supplier shall make every effort to
resolve amicably by direct informal negotiation any
disagreement or dispute arising between them under or in
connection with the Contract.
Notices
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Section VII. General Conditions of Contract
10.2 If, after twenty-eight (28) days, the parties have failed to
resolve their dispute or difference by such mutual consultation,
then either the Purchaser or the Supplier may give notice to the
other party of its intention to commence arbitration, as
hereinafter provided, as to the matter in dispute, and no
arbitration in respect of this matter may be commenced unless
such notice is given. Any dispute or difference in respect of
which a notice of intention to commence arbitration has been
given in accordance with this Clause shall be finally settled by
arbitration. Arbitration may be commenced prior to or after
delivery of the Goods under the Contract. Arbitration
proceedings shall be conducted in accordance with the rules of
procedure specified in the SCC.
10.3 Notwithstanding any reference to arbitration herein,
(a)
the parties shall continue to perform their respective
obligations under the Contract unless they otherwise agree;
and
(b)
the Purchaser shall pay the Supplier any monies due the
Supplier.
Inspections and
Audit by the
Bank
11.1 The Supplier shall permit, and shall cause its Subcontractors and
consultants to permit, the Bank and/or persons appointed by the
Bank to inspect the Supplier’s offices and all accounts and
records relating to the performance of the Contract and the
submission of the bid, and to have such accounts and records
audited by auditors appointed by the Bank if requested by the
Bank. The Supplier’s and its Subcontractors and consultants’
attention is drawn to Clause 3 [Fraud and Corruption], which
provides, inter alia, that acts intended to materially impede the
exercise of the Bank’s inspection and audit rights provided for
under this Sub-Clause 11.1 constitute a prohibited practice subject
to contract termination (as well as to a determination of
ineligibility pursuant to the Bank’s prevailing sanctions
procedures).
Scope of Supply
12.1 The Goods and Related Services to be supplied shall be as
specified in the Schedule of Requirements.
Delivery and
Documents
13.1 Subject to GCC Sub-Clause 33.1, the Delivery of the Goods and
Completion of the Related Services shall be in accordance with
the Delivery and Completion Schedule specified in the Schedule
of Requirements. The details of shipping and other documents to
be furnished by the Supplier are specified in the SCC.
Supplier’s
14.1 The Supplier shall supply all the Goods and Related Services
Section VIII. General Conditions of Contract
Responsibilities
121
included in the Scope of Supply in accordance with GCC
Clause 12, and the Delivery and Completion Schedule, as per
GCC Clause 13.
Contract Price
15.1 Prices charged by the Supplier for the Goods supplied and the
Related Services performed under the Contract shall not vary
from the prices quoted by the Supplier in its bid, with the
exception of any price adjustments authorized in the SCC.
Terms of Payment
16.1 The Contract Price, including any Advance Payments, if
applicable, shall be paid as specified in the SCC.
16.2 The Supplier’s request for payment shall be made to the
Purchaser in writing, accompanied by invoices describing, as
appropriate, the Goods delivered and Related Services
performed, and by the documents submitted pursuant to GCC
Clause 13 and upon fulfillment of all other obligations
stipulated in the Contract.
16.3 Payments shall be made promptly by the Purchaser, but in no
case later than sixty (60) days after submission of an invoice or
request for payment by the Supplier, and after the Purchaser
has accepted it.
16.4 The currencies in which payments shall be made to the
Supplier under this Contract shall be those in which the bid
price is expressed.
16.5 In the event that the Purchaser fails to pay the Supplier any
payment by its due date or within the period set forth in the
SCC, the Purchaser shall pay to the Supplier interest on the
amount of such delayed payment at the rate shown in the SCC,
for the period of delay until payment has been made in full,
whether before or after judgment or arbitrage award.
Taxes and Duties
17.1 For goods manufactured outside the Purchaser’s Country, the
Supplier shall be entirely responsible for all taxes, stamp
duties, license fees, and other such levies imposed outside the
Purchaser’s Country.
17.2 For goods Manufactured within the Purchaser’s country, the
Supplier shall be entirely responsible for all taxes, duties,
license fees, etc., incurred until delivery of the contracted
Goods to the Purchaser.
17.3 If any tax exemptions, reductions, allowances or privileges may
be available to the Supplier in the Purchaser’s Country, the
Purchaser shall use its best efforts to enable the Supplier to
benefit from any such tax savings to the maximum allowable
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Section VII. General Conditions of Contract
extent.
Performance
Security
18.1 If required as specified in the SCC, the Supplier shall, within
twenty-eight (28) days of the notification of contract award,
provide a performance security for the performance of the
Contract in the amount specified in the SCC.
18.2 The proceeds of the Performance Security shall be payable to
the Purchaser as compensation for any loss resulting from the
Supplier’s failure to complete its obligations under the
Contract.
18.3 As specified in the SCC, the Performance Security, if required,
shall be denominated in the currency(ies) of the Contract, or in
a freely convertible currency acceptable to the Purchaser; and
shall be in one of the format stipulated by the Purchaser in the
SCC, or in another format acceptable to the Purchaser.
18.4 The Performance Security shall be discharged by the Purchaser
and returned to the Supplier not later than twenty-eight (28)
days following the date of Completion of the Supplier’s
performance obligations under the Contract, including any
warranty obligations, unless specified otherwise in the SCC.
Copyright
19.1 The copyright in all drawings, documents, and other materials
containing data and information furnished to the Purchaser by
the Supplier herein shall remain vested in the Supplier, or, if
they are furnished to the Purchaser directly or through the
Supplier by any third party, including suppliers of materials,
the copyright in such materials shall remain vested in such
third party
Confidential
Information
20.1 The Purchaser and the Supplier shall keep confidential and
shall not, without the written consent of the other party hereto,
divulge to any third party any documents, data, or other
information furnished directly or indirectly by the other party
hereto in connection with the Contract, whether such
information has been furnished prior to, during or following
completion or termination of the Contract. Notwithstanding
the above, the Supplier may furnish to its Subcontractor such
documents, data, and other information it receives from the
Purchaser to the extent required for the Subcontractor to
perform its work under the Contract, in which event the
Supplier shall obtain from such Subcontractor an undertaking
of confidentiality similar to that imposed on the Supplier under
GCC Clause 20.
20.2 The Purchaser shall not use such documents, data, and other
Section VIII. General Conditions of Contract
123
information received from the Supplier for any purposes
unrelated to the contract. Similarly, the Supplier shall not use
such documents, data, and other information received from the
Purchaser for any purpose other than the performance of the
Contract.
20.3 The obligation of a party under GCC Sub-Clauses 20.1 and
20.2 above, however, shall not apply to information that:
(a)
the Purchaser or Supplier need to share with the Bank or
other institutions participating in the financing of the
Contract;
(b)
now or hereafter enters the public domain through no
fault of that party;
(c)
can be proven to have been possessed by that party at the
time of disclosure and which was not previously
obtained, directly or indirectly, from the other party; or
(d)
otherwise lawfully becomes available to that party from a
third party that has no obligation of confidentiality.
20.4 The above provisions of GCC Clause 20 shall not in any way
modify any undertaking of confidentiality given by either of
the parties hereto prior to the date of the Contract in respect of
the Supply or any part thereof.
20.5 The provisions of GCC Clause 20 shall survive completion or
termination, for whatever reason, of the Contract.
Subcontracting
21.1 The Supplier shall notify the Purchaser in writing of all
subcontracts awarded under the Contract if not already
specified in the bid. Such notification, in the original bid or
later shall not relieve the Supplier from any of its obligations,
duties, responsibilities, or liability under the Contract.
21.2 Subcontracts shall comply with the provisions of GCC Clauses
3 and 7.
Specifications and
Standards
22.1 Technical Specifications and Drawings
(a)
The Goods and Related Services supplied under this
Contract shall conform to the technical specifications and
standards mentioned in Section VI, Schedule of
Requirements and, when no applicable standard is
mentioned, the standard shall be equivalent or superior to
the official standards whose application is appropriate to
the Goods’ country of origin.
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Packing and
Documents
Section VII. General Conditions of Contract
(b)
The Supplier shall be entitled to disclaim responsibility
for any design, data, drawing, specification or other
document, or any modification thereof provided or
designed by or on behalf of the Purchaser, by giving a
notice of such disclaimer to the Purchaser.
(c)
Wherever references are made in the Contract to codes
and standards in accordance with which it shall be
executed, the edition or the revised version of such codes
and standards shall be those specified in the Schedule of
Requirements. During Contract execution, any changes in
any such codes and standards shall be applied only after
approval by the Purchaser and shall be treated in
accordance with GCC Clause 33.
23.1 The Supplier shall provide such packing of the Goods as is
required to prevent their damage or deterioration during transit
to their final destination, as indicated in the Contract. During
transit, the packing shall be sufficient to withstand, without
limitation, rough handling and exposure to extreme
temperatures, salt and precipitation, and open storage. Packing
case size and weights shall take into consideration, where
appropriate, the remoteness of the goods’ final destination and
the absence of heavy handling facilities at all points in transit.
23.2 The packing, marking, and documentation within and outside
the packages shall comply strictly with such special
requirements as shall be expressly provided for in the Contract,
including additional requirements, if any, specified in the SCC,
and in any other instructions ordered by the Purchaser.
Insurance
24.1 Unless otherwise specified in the SCC, the Goods supplied
under the Contract shall be fully insured—in a freely
convertible currency from an eligible country—against loss or
damage incidental to manufacture or acquisition,
transportation, storage, and delivery, in accordance with the
applicable Incoterms or in the manner specified in the SCC.
Transportation
25.1 Unless otherwise specified in the SCC, responsibility for
arranging transportation of the Goods shall be in accordance
with the specified Incoterms.
Inspections and
Tests
26.1 The Supplier shall at its own expense and at no cost to the
Purchaser carry out all such tests and/or inspections of the
Goods and Related Services as are specified in the SCC.
26.2 The inspections and tests may be conducted on the premises of
the Supplier or its Subcontractor, at point of delivery, and/or at
Section VIII. General Conditions of Contract
125
the Goods’ final destination, or in another place in the
Purchaser’s Country as specified in the SCC. Subject to GCC
Sub-Clause 26.3, if conducted on the premises of the Supplier
or its Subcontractor, all reasonable facilities and assistance,
including access to drawings and production data, shall be
furnished to the inspectors at no charge to the Purchaser.
26.3 The Purchaser or its designated representative shall be entitled
to attend the tests and/or inspections referred to in GCC SubClause 26.2, provided that the Purchaser bear all of its own
costs and expenses incurred in connection with such
attendance including, but not limited to, all traveling and board
and lodging expenses.
26.4 Whenever the Supplier is ready to carry out any such test and
inspection, it shall give a reasonable advance notice, including
the place and time, to the Purchaser. The Supplier shall obtain
from any relevant third party or manufacturer any necessary
permission or consent to enable the Purchaser or its designated
representative to attend the test and/or inspection.
26.5 The Purchaser may require the Supplier to carry out any test
and/or inspection not required by the Contract but deemed
necessary to verify that the characteristics and performance of
the Goods comply with the technical specifications codes and
standards under the Contract, provided that the Supplier’s
reasonable costs and expenses incurred in the carrying out of
such test and/or inspection shall be added to the Contract Price.
Further, if such test and/or inspection impedes the progress of
manufacturing and/or the Supplier’s performance of its other
obligations under the Contract, due allowance will be made in
respect of the Delivery Dates and Completion Dates and the
other obligations so affected.
26.6 The Supplier shall provide the Purchaser with a report of the
results of any such test and/or inspection.
26.7 The Purchaser may reject any Goods or any part thereof that
fail to pass any test and/or inspection or do not conform to the
specifications. The Supplier shall either rectify or replace such
rejected Goods or parts thereof or make alterations necessary
to meet the specifications at no cost to the Purchaser, and shall
repeat the test and/or inspection, at no cost to the Purchaser,
upon giving a notice pursuant to GCC Sub-Clause 26.4.
26.8 The Supplier agrees that neither the execution of a test and/or
inspection of the Goods or any part thereof, nor the attendance
by the Purchaser or its representative, nor the issue of any
report pursuant to GCC Sub-Clause 26.6, shall release the
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Section VII. General Conditions of Contract
Supplier from any warranties or other obligations under the
Contract.
Liquidated
Damages
27.1 Except as provided under GCC Clause 32, if the Supplier fails
to deliver any or all of the Goods by the Date(s) of delivery or
perform the Related Services within the period specified in the
Contract, the Purchaser may without prejudice to all its other
remedies under the Contract, deduct from the Contract Price,
as liquidated damages, a sum equivalent to the percentage
specified in the SCC of the delivered price of the delayed
Goods or unperformed Services for each week or part thereof
of delay until actual delivery or performance, up to a maximum
deduction of the percentage specified in those SCC. Once the
maximum is reached, the Purchaser may terminate the Contract
pursuant to GCC Clause 35.
Warranty
28.1 The Supplier warrants that all the Goods are new, unused, and
of the most recent or current models, and that they incorporate
all recent improvements in design and materials, unless
provided otherwise in the Contract.
28.2 Subject to GCC Sub-Clause 22.1(b), the Supplier further
warrants that the Goods shall be free from defects arising from
any act or omission of the Supplier or arising from design,
materials, and workmanship, under normal use in the
conditions prevailing in the country of final destination.
28.3 Unless otherwise specified in the SCC, the warranty shall
remain valid for twelve (12) months after the Goods, or any
portion thereof as the case may be, have been delivered to and
accepted at the final destination indicated in the SCC, or for
eighteen (18) months after the date of shipment from the port
or place of loading in the country of origin, whichever period
concludes earlier.
28.4 The Purchaser shall give notice to the Supplier stating the
nature of any such defects together with all available evidence
thereof, promptly following the discovery thereof. The
Purchaser shall afford all reasonable opportunity for the
Supplier to inspect such defects.
28.5 Upon receipt of such notice, the Supplier shall, within the
period specified in the SCC, expeditiously repair or replace the
defective Goods or parts thereof, at no cost to the Purchaser.
28.6 If having been notified, the Supplier fails to remedy the defect
within the period specified in the SCC, the Purchaser may
proceed to take within a reasonable period such remedial
Section VIII. General Conditions of Contract
127
action as may be necessary, at the Supplier’s risk and expense
and without prejudice to any other rights which the Purchaser
may have against the Supplier under the Contract.
Patent Indemnity
29.1 The Supplier shall, subject to the Purchaser’s compliance with
GCC Sub-Clause 29.2, indemnify and hold harmless the
Purchaser and its employees and officers from and against any
and all suits, actions or administrative proceedings, claims,
demands, losses, damages, costs, and expenses of any nature,
including attorney’s fees and expenses, which the Purchaser
may suffer as a result of any infringement or alleged
infringement of any patent, utility model, registered design,
trademark, copyright, or other intellectual property right
registered or otherwise existing at the date of the Contract by
reason of:
(a)
the installation of the Goods by the Supplier or the use of
the Goods in the country where the Site is located; and
(b)
the sale in any country of the products produced by the
Goods.
Such indemnity shall not cover any use of the Goods or any
part thereof other than for the purpose indicated by or to be
reasonably inferred from the Contract, neither any
infringement resulting from the use of the Goods or any part
thereof, or any products produced thereby in association or
combination with any other equipment, plant, or materials not
supplied by the Supplier, pursuant to the Contract.
29.2 If any proceedings are brought or any claim is made against the
Purchaser arising out of the matters referred to in GCC SubClause 29.1, the Purchaser shall promptly give the Supplier a
notice thereof, and the Supplier may at its own expense and in
the Purchaser’s name conduct such proceedings or claim and
any negotiations for the settlement of any such proceedings or
claim.
29.3 If the Supplier fails to notify the Purchaser within twenty-eight
(28) days after receipt of such notice that it intends to conduct
any such proceedings or claim, then the Purchaser shall be free
to conduct the same on its own behalf.
29.4 The Purchaser shall, at the Supplier’s request, afford all
available assistance to the Supplier in conducting such
proceedings or claim, and shall be reimbursed by the Supplier
for all reasonable expenses incurred in so doing.
29.5 The Purchaser shall indemnify and hold harmless the Supplier
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Section VII. General Conditions of Contract
and its employees, officers, and Subcontractors from and
against any and all suits, actions or administrative proceedings,
claims, demands, losses, damages, costs, and expenses of any
nature, including attorney’s fees and expenses, which the
Supplier may suffer as a result of any infringement or alleged
infringement of any patent, utility model, registered design,
trademark, copyright, or other intellectual property right
registered or otherwise existing at the date of the Contract
arising out of or in connection with any design, data, drawing,
specification, or other documents or materials provided or
designed by or on behalf of the Purchaser.
Limitation of
Liability
30.1 Except in cases of criminal negligence or willful misconduct,
(a)
the Supplier shall not be liable to the Purchaser, whether
in contract, tort, or otherwise, for any indirect or
consequential loss or damage, loss of use, loss of
production, or loss of profits or interest costs, provided
that this exclusion shall not apply to any obligation of the
Supplier to pay liquidated damages to the Purchaser and
(b)
the aggregate liability of the Supplier to the Purchaser,
whether under the Contract, in tort or otherwise, shall not
exceed the total Contract Price, provided that this
limitation shall not apply to the cost of repairing or
replacing defective equipment, or to any obligation of the
supplier to indemnify the purchaser with respect to patent
infringement
31.1 Unless otherwise specified in the Contract, if after the date of
Change in Laws
28 days prior to date of Bid submission, any law, regulation,
and Regulations
ordinance, order or bylaw having the force of law is enacted,
promulgated, abrogated, or changed in the place of the
Purchaser’s country where the Site is located (which shall be
deemed to include any change in interpretation or application
by the competent authorities) that subsequently affects the
Delivery Date and/or the Contract Price, then such Delivery
Date and/or Contract Price shall be correspondingly increased
or decreased, to the extent that the Supplier has thereby been
affected in the performance of any of its obligations under the
Contract. Notwithstanding the foregoing, such additional or
reduced cost shall not be separately paid or credited if the same
has already been accounted for in the price adjustment
provisions where applicable, in accordance with GCC Clause
15.
Force Majeure
32.1 The Supplier shall not be liable for forfeiture of its
Performance Security, liquidated damages, or termination for
Section VIII. General Conditions of Contract
129
default if and to the extent that its delay in performance or
other failure to perform its obligations under the Contract is the
result of an event of Force Majeure.
32.2 For purposes of this Clause, “Force Majeure” means an event
or situation beyond the control of the Supplier that is not
foreseeable, is unavoidable, and its origin is not due to
negligence or lack of care on the part of the Supplier. Such
events may include, but not be limited to, acts of the Purchaser
in its sovereign capacity, wars or revolutions, fires, floods,
epidemics, quarantine restrictions, and freight embargoes.
32.3 If a Force Majeure situation arises, the Supplier shall promptly
notify the Purchaser in writing of such condition and the cause
thereof. Unless otherwise directed by the Purchaser in writing,
the Supplier shall continue to perform its obligations under the
Contract as far as is reasonably practical, and shall seek all
reasonable alternative means for performance not prevented by
the Force Majeure event.
Change Orders and 33.1 The Purchaser may at any time order the Supplier through
notice in accordance GCC Clause 8, to make changes within
Contract
the general scope of the Contract in any one or more of the
Amendments
following:
(a)
drawings, designs, or specifications, where Goods to be
furnished under the Contract are to be specifically
manufactured for the Purchaser;
(b)
the method of shipment or packing;
(c)
the place of delivery; and
(d)
the Related Services to be provided by the Supplier.
33.2 If any such change causes an increase or decrease in the cost
of, or the time required for, the Supplier’s performance of any
provisions under the Contract, an equitable adjustment shall be
made in the Contract Price or in the Delivery/Completion
Schedule, or both, and the Contract shall accordingly be
amended. Any claims by the Supplier for adjustment under
this Clause must be asserted within twenty-eight (28) days
from the date of the Supplier’s receipt of the Purchaser’s
change order.
33.3 Prices to be charged by the Supplier for any Related Services
that might be needed but which were not included in the
Contract shall be agreed upon in advance by the parties and
shall not exceed the prevailing rates charged to other parties by
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Section VII. General Conditions of Contract
the Supplier for similar services.
33.4 Subject to the above, no variation in or modification of the
terms of the Contract shall be made except by written
amendment signed by the parties.
Extensions of Time
34.1 If at any time during performance of the Contract, the Supplier
or its subcontractors should encounter conditions impeding
timely delivery of the Goods or completion of Related Services
pursuant to GCC Clause 13, the Supplier shall promptly notify
the Purchaser in writing of the delay, its likely duration, and its
cause. As soon as practicable after receipt of the Supplier’s
notice, the Purchaser shall evaluate the situation and may at its
discretion extend the Supplier’s time for performance, in which
case the extension shall be ratified by the parties by
amendment of the Contract.
34.2 Except in case of Force Majeure, as provided under GCC
Clause 32, a delay by the Supplier in the performance of its
Delivery and Completion obligations shall render the Supplier
liable to the imposition of liquidated damages pursuant to GCC
Clause 26, unless an extension of time is agreed upon, pursuant
to GCC Sub-Clause 34.1.
Termination
35.1 Termination for Default
(a)
The Purchaser, without prejudice to any other remedy for
breach of Contract, by written notice of default sent to
the Supplier, may terminate the Contract in whole or in
part:
(i)
if the Supplier fails to deliver any or all of the
Goods within the period specified in the Contract,
or within any extension thereof granted by the
Purchaser pursuant to GCC Clause 34;
(ii) if the Supplier fails to perform any other obligation
under the Contract; or
(iii) if the Supplier, in the judgment of the Purchaser has
engaged in fraud and corruption, as defined in GCC
Clause 3, in competing for or in executing the
Contract.
(b)
In the event the Purchaser terminates the Contract in
whole or in part, pursuant to GCC Clause 35.1(a), the
Purchaser may procure, upon such terms and in such
manner as it deems appropriate, Goods or Related
Services similar to those undelivered or not performed,
Section VIII. General Conditions of Contract
131
and the Supplier shall be liable to the Purchaser for any
additional costs for such similar Goods or Related
Services.
However, the Supplier shall continue
performance of the Contract to the extent not terminated.
35.2 Termination for Insolvency.
(a)
The Purchaser may at any time terminate the Contract by
giving notice to the Supplier if the Supplier becomes
bankrupt or otherwise insolvent.
In such event,
termination will be without compensation to the Supplier,
provided that such termination will not prejudice or affect
any right of action or remedy that has accrued or will
accrue thereafter to the Purchaser
35.3 Termination for Convenience.
(a)
The Purchaser, by notice sent to the Supplier, may
terminate the Contract, in whole or in part, at any time
for its convenience. The notice of termination shall
specify that termination is for the Purchaser’s
convenience, the extent to which performance of the
Supplier under the Contract is terminated, and the date
upon which such termination becomes effective.
(b)
The Goods that are complete and ready for shipment
within twenty-eight (28) days after the Supplier’s receipt
of notice of termination shall be accepted by the
Purchaser at the Contract terms and prices. For the
remaining Goods, the Purchaser may elect:
(i)
to have any portion completed and delivered at the
Contract terms and prices; and/or
(ii)
to cancel the remainder and pay to the Supplier an
agreed amount for partially completed Goods and
Related Services and for materials and parts
previously procured by the Supplier.
Assignment
36.1 Neither the Purchaser nor the Supplier shall assign, in whole or
in part, their obligations under this Contract, except with prior
written consent of the other party.
Export Restriction
37.1 Notwithstanding any obligation under the Contract to complete
all export formalities, any export restrictions attributable to the
Purchaser, to the country of the Purchaser, or to the use of the
products/goods, systems or services to be supplied, which arise
from trade regulations from a country supplying those
products/goods, systems or services, and which substantially
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Section VII. General Conditions of Contract
impede the Supplier from meeting its obligations under the
Contract, shall release the Supplier from the obligation to
provide deliveries or services, always provided, however, that
the Supplier can demonstrate to the satisfaction of the
Purchaser and of the Bank that it has completed all formalities
in a timely manner, including applying for permits,
authorizations and licenses necessary for the export of the
products/goods, systems or services under the terms of the
Contract. Termination of the Contract on this basis shall be for
the Purchaser’s convenience pursuant to Sub-Clause 35.3.
133
Section VIII. Special Conditions of Contract
The following Special Conditions of Contract (SCC) shall supplement and / or amend the
General Conditions of Contract (GCC). Whenever there is a conflict, the provisions herein
shall prevail over those in the GCC.
GCC 1.1(j)
The Purchaser’s country is: KENYA
GCC 1.1(k)
The Purchaser is: THE KENYA POWER & LIGHTING COMPANY
LTD
GCC 1.1 (q)
The Project Site(s)/Final Destination(s) is/are: NAIROBI. LIKONI
ROAD STORES INDUSTRIAL AREA.
GCC 4.2 (a)
The meaning of the trade terms shall be as prescribed by Incoterms.
GCC 4.2 (b)
The version edition of Incoterms shall be INCOTERMS 2000
GCC 5.1
The language shall be ENGLISH
GCC 8.1
For notices, the Purchaser’s address shall be:
Attention: TEAM LEADER, PROJECT IMPLEMENTATION TEAM
Street Address: P.O BOX 30099, NAIROBI
Floor/ Room number: 2ND FLOOR, STIMA SACCO BUILDING,
KOLOBOT ROAD, PARKLANDS, NAIROBI
City: NAIROBI
ZIP Code: 00100
Country: KENYA
Telephone: +254-20-3201736
Facsimile number: 3514485
Electronic mail address: smutwiri@kplc.co.ke
GCC 9.1
The governing law shall be the law of: REPUBLIC OF KENYA
GCC 10.2
The rules of procedure for arbitration proceedings pursuant to GCC
Clause 10.2 shall be as follows:
(a) Contract with foreign Supplier:
Any dispute, controversy or claim arising out of or relating to
this Contract, or breach, termination or invalidity thereof, shall
134
Section VIII Special Conditions of Contract
be settled by arbitration in accordance with the UNCITRAL
Arbitration Rules as at present in force.
(b)
Contracts with Supplier national of the Purchaser’s country:
In the case of a dispute between the Purchaser and a Supplier
who is a national of the Purchaser’s country, the dispute shall
be referred to adjudication or arbitration in accordance with the
laws of the Purchaser’s country.
GCC 13.1
Details of Shipping and other Documents to be furnished by the Supplier
are for Goods to be Imported CIP Terms.
The procuring entity desires that the Goods be on cost and freight to
Nairobi, Kenya in accordance with the schedule of requirements as
stipulated in the tender document.
(a)
Upon shipment, the Manufacturer shall notify the Procuring
entity and Insurance by paper mail or fax the full details of the
shipment including Order number, description of goods,
quantity, the aircraft, the airway bill number and the date of
shipment, port of discharge, etc. The Manufacturer shall
courier the following documents in one copy to the Procuring
entity, with a copy to the Insurance Company.
(i)
The Supplier’s invoice showing Goods description,
quantity, unit price, total amount;
(ii)
Non- negotiable airway bill/Bill of lading;
(iii)
Packing list identifying contents of each Package;
(iv)
Manufacturer’s or supplier’s warranty certificate;
(v)
Inspection certificate issued by the nominated
inspection agency and the Manufacturer’s factory
inspection report; and
(vi)
Certificate of origin.
(vii)
Insurance certificate
The above documents shall be received by the Purchaser before
arrival of the Goods and, if not received, the Supplier will be
responsible for any consequent expenses.
For Goods from within the Purchaser’s Country
EXW Terms
Upon delivery of Goods to the transporter, the Supplier shall notify
Section VIII Special Conditions of Contract
135
the purchase and email or courier the document to the Purchaser:
(i)
Copies of the Supplier’s invoice showing Goods
description, quantity, unit price, and total amount
(ii)
Delivery note, railway or truck receipt
(iii)
Manufacturer’s or Supplier’s warranty certificate
(iv)
The Supplier’s inspection report
(v)
Certificate of origin
The above documents shall be received by the Purchaser before arrival of
the Goods and, if not received, the Supplier will be responsible for any
consequent expenses.
The above documents shall be received by the Purchaser before arrival of
the Goods and, if not received, the Supplier will be responsible for any
consequent expenses.
GCC 15.1
GCC 16.1
The prices charged for the Goods supplied and the related Services
performed shall not, be adjustable.
GCC 16.1—The method and conditions of payment to be made to
the Supplier under this Contract shall be as follows:
Payment for Goods supplied from abroad:
Payment of foreign currency portion shall be made in the currency
of the Contract Price in the following manner:
(i)
Advance payment of 10%
(ii) On Shipment: Eighty (80) percent of the Contract Price of the
Goods shipped shall be paid through irrevocable confirmed
letter of credit opened in favor of the Supplier in a bank in its
country, upon submission of documents specified in GCC
Clause 13.
(iii) On Acceptance: Ten (10) percent of the Contract Price of
Goods received shall be paid within thirty (30) days of receipt
of the Goods upon submission of claim supported by the
acceptance certificate issued by the Purchaser.
Payment of local currency portion shall be made in KES within
thirty (30) days of presentation of claim supported by a certificate
from the Purchaser declaring that the Goods have been delivered and
that all other contracted Services have been performed.
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Section VIII Special Conditions of Contract
Payment for Goods and Services supplied from within the
Purchaser’s country:
Payment for Goods and Services supplied from within the
Purchaser’s country shall be made in KES, as follows:
Payment for Goods supplied from abroad:
Payment of foreign currency portion shall be made in the currency
of the Contract Price in the following manner:
(i)
Advance payment: Ten(10) percent
(ii) On Shipment: Eighty (80) percent of the Contract Price of the
Goods shipped shall be paid through irrevocable confirmed
letter of credit opened in favor of the Supplier in a bank in its
country, upon submission of documents specified in GCC
Clause 13.
(iii) On Acceptance: Ten (10) percent of the Contract Price of
Goods received shall be paid within thirty (30) days of receipt
of the Goods upon submission of claim supported by the
acceptance certificate issued by the Purchaser.
Payment of local currency portion shall be made in KES within
thirty (30) days of presentation of claim supported by a certificate
from the Purchaser declaring that the Goods have been delivered and
that all other contracted Services have been performed.
GCC 16.5
The payment-delay period after which the Purchaser shall pay interest to
the supplier shall be 60 days.
The interest rate that shall be applied will be the prevailing Central Bank
of Kenya 91 days Treasury Bill Rate on the date the payment became due.
GCC 18.1
A Performance Security shall be required.
GCC 18.3
If required, the Performance Security shall be in the form of : a Bank
Guarantee and shall be denominated in a freely convertible currency
acceptable to the Purchaser.
GCC 18.4
Discharge of the Performance Security shall take place Thirty (30) days
after expiry of the supplier’s warranty obligation.
Section VIII Special Conditions of Contract
GCC 23.2
137
The packing, marking and documentation within and outside the packages
shall be:
Packing (General Conditions of Contract)
The method of packing and package marking shall be specified and
attached to the order.
The Goods shall be packed in good condition suitable for Sea/Air
dispatch. Hazard in transit to the final destination shall include rough
handling and storage in tropical conditions. The manufacturer shall
enclose a packing list in each package and all documents relating to the
package.
GCC 24.1
The insurance coverage shall be as specified in the Incoterms.
GCC 25.1
Responsibility for transportation of the Goods shall be as specified in the
Incoterms.
For goods to be supplied from within Kenya, the supplier is required
under the contract to transport the goods to the Project Site and provide
insurance and storage.
GCC 26.1
The inspections and tests shall be: International Standard For Acceptance
Inspection, IEC 1358.
GCC 26.2
The Inspections and tests shall be conducted by KPLC Engineers at
Manufacturer’s Place.
The cost of inspection and tests shall be borne by the bidder. The cost
Exclude costs of travel & accommodation from Kenya to Nearest Airport
to Manufacturers facility which shall be borne by KPLC.
GCC 27.1
The liquidated damage shall be: 0.5% per week
GCC 27.1
The maximum amount of liquidated damages shall be: 10%
GCC 28.3
The period of validity of the Warranty shall be 12 months after acceptance
of the goods
For purposes of the Warranty, the place(s) of final destination(s) shall be:
Any Place In Kenya.
GCC 28.5
The period for repair or replacement shall be: 45days.
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Section IX. Contract Forms
Table of Forms
1. Contract Agreement ....................................................................................................... 140
2. Performance Security ..................................................................................................... 142
3. Bank Guarantee for Advance Payment ........................................................................ 143
140
Section IX Contract Forms
1. Contract Agreement
[The successful Bidder shall fill in this form in accordance with the instructions indicated]
THIS CONTRACT AGREEMENT is made
the [ insert: number ] day of [ insert: month ], [ insert: year ].
BETWEEN
(1)
[ insert complete name of Purchaser ], a [ insert description of type of legal
entity, for example, an agency of the Ministry of .... of the Government of
{ insert name of Country of Purchaser }, or corporation incorporated under
the laws of { insert name of Country of Purchaser } ] and having its principal
place of business at [ insert address of Purchaser ] (hereinafter called “the
Purchaser”), and
(2)
[ insert name of Supplier ], a corporation incorporated under the laws of
[ insert: country of Supplier ] and having its principal place of business at
[ insert: address of Supplier ] (hereinafter called “the Supplier”).
WHEREAS the Purchaser invited bids for certain Goods and ancillary services, viz., [insert
brief description of Goods and Services] and has accepted a Bid by the Supplier for the
supply of those Goods and Services in the sum of [insert Contract Price in words and
figures, expressed in the Contract currency(ies) ] (hereinafter called “the Contract Price”).
NOW THIS AGREEMENT WITNESSETH AS FOLLOWS:
1.
In this Agreement words and expressions shall have the same meanings as are
respectively assigned to them in the Conditions of Contract referred to.
2.
The following documents shall constitute the Contract between the Purchaser and the
Supplier, and each shall be read and construed as an integral part of the Contract:
(a)
This Contract Agreement
(b)
Special Conditions of Contract
(c)
General Conditions of Contract
(d)
Technical Requirements (including Schedule of Requirements and Technical
Specifications)
(e)
The Supplier’s Bid and original Price Schedules
(f)
The Purchaser’s Notification of Award
Section IX Contract Forms
141
3.
This Contract shall prevail over all other Contract documents. In the event of any
discrepancy or inconsistency within the Contract documents, then the documents shall
prevail in the order listed above.
4.
In consideration of the payments to be made by the Purchaser to the Supplier as
hereinafter mentioned, the Supplier hereby covenants with the Purchaser to provide the
Goods and Services and to remedy defects therein in conformity in all respects with the
provisions of the Contract.
5.
The Purchaser hereby covenants to pay the Supplier in consideration of the provision of
the Goods and Services and the remedying of defects therein, the Contract Price or such
other sum as may become payable under the provisions of the Contract at the times and
in the manner prescribed by the Contract.
IN WITNESS whereof the parties hereto have caused this Agreement to be executed in
accordance with the laws of [insert the name of the Contract governing law country] on the
day, month and year indicated above.
For and on behalf of the Purchaser
Signed: [insert signature]
in the capacity of [ insert title or other appropriate designation ]
in the presence of [insert identification of official witness]
For and on behalf of the Supplier
Signed: [insert signature of authorized representative(s) of the Supplier]
in the capacity of [ insert title or other appropriate designation ]
in the presence of [ insert identification of official witness]
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Section IX Contract Forms
2. Performance Security
[The bank, as requested by the successful Bidder, shall fill in this form in accordance with
the instructions indicated]
Date: [insert date (as day, month, and year) of Bid Submission]
ICB No. and title: [insert no. and title of bidding process]
Bank’s Branch or Office: [insert complete name of Guarantor]
Beneficiary: [insert complete name of Purchaser]
PERFORMANCE GUARANTEE No.:
[insert Performance Guarantee number]
We have been informed that [insert complete name of Supplier] (hereinafter called "the
Supplier") has entered into Contract No. [insert number] dated [insert day and month],
[insert year] with you, for the supply of [description of Goods and related Services]
(hereinafter called "the Contract").
Furthermore, we understand that, according to the conditions of the Contract, a Performance
Guarantee is required.
At the request of the Supplier, we hereby irrevocably undertake to pay you any sum(s) not
exceeding [insert amount(s11) in figures and words] upon receipt by us of your first demand
in writing declaring the Supplier to be in default under the Contract, without cavil or
argument, or your needing to prove or to show grounds or reasons for your demand or the
sum specified therein.
This Guarantee shall expire no later than the [insert number] day of [insert month] [insert
year],12 and any demand for payment under it must be received by us at this office on or
before that date.
This guarantee is subject to the Uniform Rules for Demand Guarantees, ICC Publication No.
458, except that subparagraph (ii) of Sub-article 20(a) is hereby excluded.
[signatures of authorized representatives of the bank and the Supplier]
11
12
The Bank shall insert the amount(s) specified in the SCC and denominated, as specified in the SCC, either
in the currency(ies) of the Contract or a freely convertible currency acceptable to the Purchaser.
Dates established in accordance with Clause 18.4 of the General Conditions of Contract (“GCC”), taking
into account any warranty obligations of the Supplier under Clause 16.2 of the GCC intended to be secured
by a partial Performance Guarantee. The Purchaser should note that in the event of an extension of the
time to perform the Contract, the Purchaser would need to request an extension of this Guarantee from the
Bank. Such request must be in writing and must be made prior to the expiration date established in the
Guarantee. In preparing this Guarantee, the Purchaser might consider adding the following text to the
Form, at the end of the penultimate paragraph: “We agree to a one-time extension of this Guarantee for a
period not to exceed [six months] [one year], in response to the Purchaser’s written request for such
extension, such request to be presented to us before the expiry of the Guarantee.”
Section IX Contract Forms
143
3. Bank Guarantee for Advance Payment
[The bank, as requested by the successful Bidder, shall fill in this form in accordance with
the instructions indicated.]
Date: [insert date (as day, month, and year) of Bid Submission]
ICB No. and title: [insert number and title of bidding process]
[bank’s letterhead]
Beneficiary: [insert legal name and address of Purchaser]
ADVANCE PAYMENT GUARANTEE No.: [insert Advance Payment Guarantee no.]
We, [insert legal name and address of bank], have been informed that [insert complete name
and address of Supplier] (hereinafter called "the Supplier") has entered into Contract No.
[insert number] dated [insert date of Agreement] with you, for the supply of [insert types of
Goods to be delivered] (hereinafter called "the Contract").
Furthermore, we understand that, according to the conditions of the Contract, an advance is
to be made against an advance payment guarantee.
At the request of the Supplier, we hereby irrevocably undertake to pay you any sum or sums
not exceeding in total an amount of [insert amount(s)13 in figures and words] upon receipt by
us of your first demand in writing declaring that the Supplier is in breach of its obligation
under the Contract because the Supplier used the advance payment for purposes other than
toward delivery of the Goods.
It is a condition for any claim and payment under this Guarantee to be made that the advance
payment referred to above must have been received by the Supplier on its account [insert
number and domicile of the account]
This Guarantee shall remain valid and in full effect from the date of the advance payment
received by the Supplier under the Contract until [insert date14].
This Guarantee is subject to the Uniform Rules for Demand Guarantees, ICC Publication No.
458. _____________________
[signature(s) of authorized representative(s) of the bank]
13
14
The bank shall insert the amount(s) specified in the SCC and denominated, as specified in the SCC, either
in the currency(ies) of the Contract or a freely convertible currency acceptable to the Purchaser.
Insert the Delivery date stipulated in the Contract Delivery Schedule. The Purchaser should note that in the
event of an extension of the time to perform the Contract, the Purchaser would need to request an extension
of this Guarantee from the bank. Such request must be in writing and must be made prior to the expiration
date established in the Guarantee. In preparing this Guarantee, the Purchaser might consider adding the
following text to the Form, at the end of the penultimate paragraph: “We agree to a one-time extension of
this Guarantee for a period not to exceed [six months][one year], in response to the Purchaser’s written
request for such extension, such request to be presented to us before the expiry of the Guarantee.”
Page 143Kenya Power and Lighting Company Limited Substation Bidding Contract – April2012
Section IX Contract Forms
145
Invitation for Bids (IFB)
REPUBLIC OF KENYA
ENERGY SECTOR RECOVERY PROJECT
CREDIT No. 4572-KE
Purchase of Primary Substation Power Transformers; 23MVA 132/33KV Transformers,
23MVA 66/11KV Transformers, 23MVA 33/11KV Transformers
IFB No. KP1/6E/2/A23
1.
This Invitation for Bids follows the General Procurement Notice for this Project that
appeared in dg Market of 27/04/2010.
2.
The Government of the Republic of Kenya has received a credit from the International
Development Association toward the cost of Energy Sector Recovery Project and it intends to
apply part of the proceeds of this credit to payments under the Contract for Purchase of Primary
Substation Power Transformers; 23MVA 132/33KV Transformers, 23MVA 66/11KV Transformers, and
23MVA 33/11 KV Transformers.
.
3.
The Kenya Power & Lighting Co. Ltd now invites sealed bids from eligible and qualified
bidders for Supply of Primary substation Transformers
(a) 132/33KV 23MVA 7 No
(b) 66/11KV 23MVA 8 No.
(c) 33/11KV 23MVA 2 No.
4.
Bidding will be conducted through the International Competitive Bidding (ICB) procedures
specified in the World Bank’s Guidelines: Procurement under IBRD Loans and IDA Credits, and
is open to all bidders from Eligible Source Countries as defined in the Guidelines.
5.
Bidders may obtain further information from The Kenya Power and Lighting Company
Limited and inspect the Bidding Documents at the address given below from 0900 to 1600 hours,
Monday to Friday excluding public holidays.
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Section IX Contract Forms
Address
Eng. Stanley Mutwiri, Project Leader
Energy Sector Recovery Project,
The Kenya Power and Lighting Company
Second Floor, Stima Investment Plaza
Mushembi Road
P.O Box 00100-30099
Nairobi, Kenya
Telephone: 254-20-32017365
Facsimile Number: 254-20-3201889
Electronic mail address: Smutwiri@kplc.co.ke
6.
Qualifications requirements include:
I. The bidder shall furnish documentary evidence that it has access to credit or liquid asset of
upto US$ 500,000. This may be in the form of a letter from the bidder’s bankers.
II. The bidder shall furnish documentary evidence that the manufacturer has supplied similar
quantities outside the country of manufacture in the last 5 years.
III. Valid ISO 9001 certificate or equivalent Quality Assurance Certification for the
Manufacturer of Goods shall be required.
7.
A complete set of Bidding Documents in English may be purchased by interested bidders
on the submission of a written Application to the address below and upon payment of a non
refundable fee of US$ 100 OR Kshs 8,000. The method of payment will be Bankers Cheque in
favour of KPLC Ltd or paid in cash in Chief Accountant Office, 1st Floor, Stima Plaza, Kolobot
Road. The Bidding Documents will be sent by Courier if requested and the bidder will meet the
cost.
8.
Bids must be delivered to the address below at or before 17th August 2012 at 10.00 am.
Electronic bidding will not be permitted. Late bids will be rejected. Bids will be opened in the
presence of the bidders’ representatives who choose to attend in person at the address below at
10.00 am. All bids must be accompanied by a Bid Security of at least US$150,000 or an equivalent
amount in a freely convertible currency.
9.
The address referred to above is:
The Company Secretary,
The Kenya Power and Lighting Company Limited
7th Floor, Stima Plaza, Kolobot Road,
Nairobi, Kenya.