NIT for design, manufacture, testing, supply and

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ASSAM POWER DISTRIBUTION COMPANY LTD.
Project, Planning & Design
BID DOCUMENT
FOR
DESIGN, MANUFACTURE, TESTING AND SUPPLY OF 33/11kV,
5 MVA & 33/11 KV, 10 MVA POWER TRANSFORMERS
SCHEME: ANNUAL PLAN: 2013-14
NIT NO.CGM (PP&D)/ APDCL/A P 2013-14(Work Component)/Buffer Stock/ PTr/01
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INDEX
Section – 1
Invitation for Bid
Section – 2 Tender Inviting ProposalSection – 3
Qualifying Requirement of the Bidder
Section – 4
Bid proposal sheet
Section – 5
Schedule of price and delivery --
Section – 6
Technical Specification & Guaranteed Technical Particulars
Section – 7
Forms of bid
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ASSAM POWER DISTRIBUTION CO. LTD
PROJECT PLANNING & DESIGN
Office: Bijulee Bhawan, 6th floor, Paltan Bazar, Guwahati-781001; Phone 0361-2739514, Fax 0361-2739535
Web site: www.apdcl.gov.in E Mail: [email protected]
NIT NO.CGM (PP&D)/ APDCL/A P 2013-14(Work Component)/Buffer Stock/ PTr/01
The Chief General Manager (PP&D), Assam Power Distribution Co. Ltd. Bijulee Bhawan,
Paltanbazar, Guwahati-1, invites tenders from
supply and despatch at site for
reputed manufacturers for design, manufacture, testing,
33/11kV, 5 MVA Power transformer and 33/11 kV, 10 MVA, Power
transformer under Annual Plan :2013-14(Work Component) as per package given below.
Package No.
Package No.1:
33/11kV, 5MVA Power
transformer
Package No.2
33/11kV, 10MVA Power
transformer
Item
Description
Qty
Earnest
Money
Average Annual
Turnover
(last three years)
Tender
participation
fee
33/11kV,
5 MVA
6(six)
nos.
₹. 3.75
Lakhs
₹.500 .00
Lakhs
₹.6000 .00
33/11kV,
10 MVA
5( five)
nos.
₹.5.50
Lakhs
₹.600.00
Lakhs
₹.10000.00
Details may be seen in the website www.apdcl.gov.in and will be available from 17.12.2014
Chief General Manager (PP&D),
th
APDCL, 6 floor, Bijulee Bhawan.
Paltan bazaar, Guwahati-1
Memo No. CGM (PP&D)/ APDCL/ AP-2013-14/ Buffer Stock/P. Tr /
Dated:
Copy to: 1. PS to the Managing Director, APDCL, Bijulee Bhawan for kind appraisal of the MD.
2. The CGM(D),LAR/UAR/CAR, APDCL, Bijulee Bhawan, Guwahati-1- for favour of kind
information.
3. The PRO, APDCL, Bijulee Bhawan, Paltan Bazar, Guwahati for publication of the above tender
in one issue of a “National paper” and “The Assam Tribune”.
4. The OSD to MD, APDCL, Bijulee Bhawan, Paltan bazaar, Guwahati for publication in the official
website.
Chief General Manager (PP&D), APCDL
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SECTION 1
INVITATION FOR BID
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ASSAM POWER DISTRIBUTION CO. LTD.
Bijulee Bhawan, Paltanbazar, Guwahati-781001
NIT NO.CGM (PP&D)/ APDCL/A P 2013-14(Work Component)/Buffer Stock/ PTr/01
The Chief General Manager (PP&D), Assam Power Distribution Co. Ltd. Bijulee Bhawan,
Paltanbazar, Guwahati-1, invites tenders from
reputed manufactures for design, manufacture ,
assembly testing at manufacturer’s works , supply and dispatch at store/site for 33/11kV, 5 MVA
Power transformer and 33/11 KV, 10 MVA power transformer under Annual Plan :2013-14 (Work
Component) as per package given below.
Package No.
Package No.1:
33/11kV, 5MVA
Power
transformer
Package No.2
33/11kV, 10MVA
Power
transformer
Item
Description
Quantity
Earnest
Money
Average Annual
Turnover
(last three years)
Tender
participation fee
33/11kV,
5 MVA
6(six)
nos.
₹. 3.75
Lakhs
₹.500 .00
Lakhs
₹.6000 .00
33/11kV,
10 MVA
5( five)
nos.
₹.5.50
Lakhs
₹.600.00
Lakhs
₹.10000.00
The bidder can participate in either of the packages or both the packages. Both the bids will be
evaluated separately.
Tender participation fee: Bid documents can be obtained from the office of the undersigned
on payment of requisite tender participation fee as mentioned above only in the form of Bank
Draft/Banker’s cheque pledged in favour of “ASSAM POWER DISTRIBUTION CO.
LTD.GUWAHATI-1” on any working days from 17/12/2014 upto 08.01.2015. Alternatively, the
Bid document can be downloaded from the APDCL’s website: www.apdcl.gov.in for tender
submission purpose. The Bidders using downloaded document will attach an A/C Payee
Demand Draft/Banker’s cheque (non refundable) for an amount mentioned above may be
duly pledged in favour of “ASSAM POWER DISTRIBUTION COMPANY LIMITED” with their
Bids as tender participation fee. Bidders will ensure that documents in full is downloaded
and used.
Details may be seen in the website www.apdcl.gov.in.. The bidder who opted for downloading
has to intimate the authority about the downloading by e-mail at [email protected]
Any bid without payment of cost of tender for package as above will be rejected outright; the
date of purchase of said A/C payee Demand Draft/Banker cheque should be within the date of
issue of tender paper.
Details may be seen in the website www.apdcl.gov.in
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1. Delivery period: 150 (one hundred fifty) days from the date of approval of GTP and
drawing. GTP and
drawing should be submitted within 45 (forty five) days from the
date of issue of work order.
2. Delivery Schedule: To any place within the state of Assam ( details will be issued in due
course of time)
3. Bid validity: 180 (one hundred eighty) days from the date of submission of Bid.
4. Pre-bid Discussion:-13-00Hrs 30.12. 2014
5. Sale of Bid: Up to 11-00Hrs 08.01.2015
6. Date of submission of Tenders: Up to 13-00 Hrs. 08.01.2015
7. Date of opening of Bid:
a. Techno commercial bids will be opened at 13-30 Hrs.08.01.2015
b.
The price bid on a date to be notified later on
8.
Terms and condition
i)
The Techno-Commercial & Price bids must be submitted in two separate sealed cover
superscripting the following on both the covers
a) Name of bidder with full address
b) Tender Notice No.
c) “ Techno-Commercial bid with earnest money” for envelope containing Technocommercial Bid and “ Price bid” for envelope containing the price bid.
ii)
Earnest money as stipulated should be submitted with the Techno Commercial bid in the
form of Bank Call Deposit/NSC/Term Deposit/ BG of nationalized bank pledged in favour of
“ASSAM POWER DISTRIBUTION COMPANY LIMITED, Guwahati-1”. Any tender without
earnest money will be rejected outright.
iii) Price bids shall consist of price bidding schedule with quantity and prices filled up along with
relevant taxes and duties as applicable.
iv) Rates should be quoted both in figures and words legibly and no overwriting will be
accepted
v) The Company will not be responsible for any cost or expenses incurred on the preparation
or delivery of the bids.
vi) Quoted rate must be valid for a minimum of 180 days.
vii) The tender should be submitted in the office of the Chief General Manager (PP&D),
APDCL, Bijulee Bhawan, 6
th
floor, Paltanbazar, Guwahati-1 and will be opened on the
scheduled date & time in presence of the intending bidders.
viii) The Company reserves the right to accept or reject any tender in part or in full or spilt the
work or cancel/withdraw the Notice inviting tender without assigning any reason thereof
whatsoever and in such case, no bidder/intending bidder shall have any claim arising out of
such action.
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ix) The Company is not bound to accept the lowest quoted rate.
x) The Company reserves the right to split the quantity to be ordered amongst technically
qualified bidders
xi) The Company reserves the right to reduce the quantity or order them in full or part thereof in
phased manner and also may modify slightly the delivery schedule (destination) of
transformer at any time.
xii) The bidding documents are not transferable and tender participation fee is not refundable
under any circumstances.
Chief General Manager (PP&D),
th
APDCL, 6 floor, Bijulee Bhawan.
Paltan bazaar, Guwahati-1
Memo No. CGM (PP&D)/ APDCL/ AP-2013-14/ Buffer Stock/P. Tr /
Dated:
Copy to: 1. PS to the Managing Director, APDCL, Bijulee Bhawan for kind appraisal of the MD
2.
The CGM(D),LAR/UAR/CAR, APDCL, Bijulee Bhawan, Guwahati-1--- for favour of kind information
3.
The PRO, APDCL, Bijulee Bhawan, Paltan Bazar, Guwahati for publication of the above tender in one
issue of a “National paper” and “The Assam Tribune”
4. The OSD to MD, APDCL, Bijulee Bhawan, Paltan bazaar, Guwahati for publication in the official
website
Chief General Manager (PP&D), APDCL,
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SECTION 2
TENDER INVITING PROPOSAL
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ASSAM POWER DISTRIBUTION CO. LTD
PROJECT, PLANNING & DESIGN
2.
TENDER INVITING PROPOSALS WITH ADDITIONAL TERMS & CONDITIONS
2.1.
Intent of the Tender Enquiry: The intent of the Tender Enquiry is to invite proposals from manufacturers
for design, manufacture, testing and supply of 6(six) nos. of 33/11kV, 5MVA, Power Transformers and 5
(five) nos. of 33/11 KV, 10 MVA Power transformers.
2.2.
Scope of Work: The scope of work involves design, engineering, manufacture, assembly, inspection, predispatch testing at manufacturer’s works, packing, supply and delivery at store/ site including insurance
during transit to store/site under different location of APDCL within the State of Assam.
2.3.
Basic specification of the equipment to be supplied
Equipment to be supplied shall provide easy and effective:

Maintainability

Reliability

Availability

Long life
2.4.
Submission of bid: The bidder can submit their bid in a sealed envelope as follows:
2.4.1.
Techno-commercial bid: Techno-commercial bid should be submitted in a envelope super scribing
“Techno-commercial bid” with name of bidder with full address, NIT reference etc. and under this, the
tenderer should submit
a)
Earnest money deposit
b)
Technical details along with type test certificate from Govt. approved test house.
c)
Drawings.
d)
Validity of offer
e)
Terms of payment
f)
Delivery schedule
g)
Annual turnover
h)
Order executing details
i)
User’s performance Report
j)
Tender proforma for techno-commercial Bid is enclosed as Annexure-I.
2.4.2.
Earnest Money Deposit (EMD): The Tender must be accompanied with earnest money as mentioned
in the NIT and it is to be deposited in the form of Bank Call Deposit/NSC/Term Deposit/ BG of
nationalized bank or scheduled bank of RBI having their regional office in Assam or at least a branch
office at Guwahati ( in case of those , whose regional office is not located in the state of Assam) with a
certificate from the Bank to the effect that the verification or any confirmation in regard to the BG issued
by the bank can be taken up with the Branch office at Guwahati pledged in favour of “ASSAM POWER
DISTRIBUTION COMPANY LIMITED. Guwahati-1”. The EMD should be valid for 6 (six) months from
the date of submission of tender along with Techno- Commercial bid. The earnest money of the
unsuccessful bidders will be released on finalization of the tenders. The EMD to the successful bidders
will be released on submission of 10% Performance Security Deposit to the undersigned as per clause
2.11 of the bid document. The EMD of the successful bidder will be forfeited on non-acceptance of
Letter of Intent (LOI) within the stipulated period mentioned in LOI.
Price Bid
a)
The price bid should be submitted in a separate envelope Superscripting “Price Bid” with
name of bidder with full address, NIT reference, etc.
b)
The price bid should distinctly indicate the following components –quoted price with clear
differentiation of Ex-factory price, Freight & Insurance, Taxes and Duties
2.4.3.
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2.4.4.
The “Techno-commercial Bid” and “Price Bid” are to be submitted as mentioned above (i.e separately
under two separate sealed envelopes) and both the envelopes should be placed in a bigger envelope
superscripting name of bidder with full address, NIT reference etc. and addressed to Chief General
th
Manager(PP&D), APDCL, Bijulee Bhawan, 6 Floor, Paltanbazar, Guwahati-781001.
Bidders should furnish order execution details of items of similar specification for a minimum of last
three years.
2.4.5.
.
2.4.6.
Each and every paper of the tender bid should be signed affixing seal by the bidder while submitting
tender/bid.
2.4.7.
The Contractor shall furnish copies of test certificates of materials used for manufacture and also the
test certificates of the tests conducted on the equipment after manufacture. The contractor shall also
furnish the test certificate of bought out components for approval by the purchaser.
2.5.
The bidders are to quote variable rates as per IEEMA price variation formula with a sealing of ±
10%, with base date as December’ 2014 in the schedule of price and delivery.
2.6.
Telegraphic/ telex offer shall not be considered and tenders received after the due time even though
posted earlier shall not be accepted. The undersigned shall not be responsible for any postal delay.
2.7.
Post tender revision of quoted rates and /or revision of terms and conditions having direct or indirect
impact on the quoted rate shall not be accepted and the offer could be rejected and earnest money shall
be forfeited. Withdrawal of offer within the quoted validity period shall not be accepted and if withdrawn the
offer, the earnest money shall be forfeited. Purchaser reserves the right for negotiation of rates, terms and
conditions only.
2.8.
Opening of bid:
2.8.1.
The techno-commercial Bid shall be opened on the due date and due time or on the next working day
in case of the due date being a holiday, in presence of the bidder or their authorized representatives.
The evaluation of bids will be carried out, first of techno-commercial bid and thereafter opening the
price bid of only those who qualify and meet the technical requirement.
The price bid of technically approved bidder will be opened on a separate date after due intimation.
Company reserves the right not to award the order to the price-wise lowest party if the party during
evaluation is found to be technically non responsive.
2.8.2.
2.8.3.
2.8.4.
2.9.
Terms of payment: 100% payment with all taxes and duties for each lot of supply will be released within
30 days from the date of receipt of materials in full and in good condition at store/ site, by the consignee.
Payment will be released by the CGM(PP&D), APDCL on receipt of the passed bill from consignee
subject to the following condition.
a)
b)
c)
d)
Supply should be strictly conforming to relevant technical specification
Bill in triplicate along with consignment note and other documents such as challan, packing, list with
revenue stamp where ever necessary should be sent to the consignee for onward transmission to this
office for payment. The challan to be submitted to the consignee for payment should have signature
with date and seal of the officer receiving the transformer.
Before dispatch, clearance from APDCL for each and every consignment /equipment should invariably
be obtained. Inspection report with detailed test results should be furnished along with each
consignment.
The supplier should intimate the undersigned the dispatch of every consignment along with supporting
documents for our record.
2.10. Insurance: You are requested to dispatch the materials duly insured to final destination against any
loss/damage in transit through your underwriter at your cost.
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Please note that APDCL shall intimate you any loss, shortage, damage etc. of materials if any at
the time of taking delivery from the carrier within 30 days. Supplier shall arrange replacement of the
damage/losses/shortage etc. within 30 days of intimation without waiting for settlement of the claim from
the carrier/underwriter.
2.11. Performance Security Deposit:
a) The successful manufacturer/ bidder shall have to deposit performance security deposit in the shape of
Bank Guarantee of nationalized bank or scheduled bank of RBI having their regional office in Assam or at
least a branch office at Guwahati ( in case of those , whose regional office is not located in the state of
Assam) with a certificate from the Bank to the effect that the verification or any confirmation in regard to the
BG issued by the bank can be taken up with the Branch office at Guwahati pledged in favour of “ASSAM
POWER DISTRIBUTION COMPANY LIMITED. Guwahati-1” as per proforma for an amount equivalent to
10% (ten percent) of the contract value of the supply order duly pledged in favour of “ASSAM POWER
DISTRIBUTION COMPANY LIMITED. Guwahati-1”. The BG should be furnished to the CGM(PP&D),
APDCL along with the acceptance of Letter of Intent (LOI). The validity of the BG should be initially for a
period of 60 (sixty) months from the date of issue of LOI with a provision for extension of the same to cover
the entire warranty period as per clause 2.12. If supplier fails or neglect to perform any of his obligation
under the contract, the APDCL shall have the right to forfeit in full or in part at its absolute discretion the
performance security deposit furnished by the supplier. No interest shall be payable on such deposits.
Detail order will be issued on receipt of acceptance of LOI and Performance security deposit.
2.12. Warranty : Warranty of the transformer will be for 60(sixty ) month the date of commissioning or 66 (sixty
six) months from the date of receipt of the materials at our store in good and acceptable condition
whichever is earlier.
2.13. Road Permit: Road permit will be arranged by the supplier on payment of entry tax which will be
reimbursed after submission of relevant document. The concerned DGM of the Circle (consignee) will
reasonably help in procuring the road permit.
2.14. The employer may ask the manufacturer to depute their engineer for supervision of commissioning work
of the transformer supplied for which the rate has been quoted by the bidder
2.15. The company reserves the right to split the quantity to be ordered amongst the technically qualified
bidders.
2.16. The Company reserves the right to reduce the quantity or order them in full or part thereof in phased
manner and also may modify the delivery destination of the transformer at any time.
2.17. Past and present performance of the bidder in ASEB or in any of its successor companies will be taken
into account to decide the eligibility.
2.18. Terms and conditions which are not specified herein above will be governed by APDCL’s General
Terms and Conditions of supply and erection in force which may be seen in APDCL website
www.apdcl.gov.in.
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SECTION 3
QUALIFYING REQUIREMENT
OF THE BIDDER
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QUALIFYING REQUIREMENT OF THE BIDDER
3.1.
To be qualified for award of contract, the Bidder shall submit a written power of attorney authorizing the
signatory of the Bid to commit on behalf of the bidder and must compulsorily meet the following minimum
criteria.
3.1.1.
Past and present performance of the bidder in ASEB or in any of its successor companies will be taken
into account to decide the eligibility
3.1.2.
The bidder should be a manufacturer of 33/11 kV Power transformers at least for a period of 5(five) years
as on date of submission of bids. He must have designed, manufactured; type tested and supplied
Power transformers and should list such works executed as Qualifying Requirement. The average
manufacture capacity during last 5(five) years must be at least 10% of the required quantity.
3.1.3.
The bidder should have successfully manufactured on its own and not its financial or technical
collaborator, at least 30(Thirty) nos. of 33/11kV, 5MVA and 30(Thirty) nos. of 33/11kV, 10 MVA Power
transformers during the last 3(three) years supported by relevant documentary evidences.
3.1.4.
The bidder must furnish performance report of Power transformers manufactured and supplied by the
bidder from at least two utilities. The report must be signed by an officer not below the rank of
Superintending Engineer/ Deputy General Manger of the utilities.
3.2.
Each Technical Proposal must be accompanied by each of the following information/ documents with
sufficient details along with other documents and information mentioned elsewhere to enable the
purchaser to make an appraisal of the quality and suitability of the material and equipment offered.
3.2.1.
Type test certificates of transformer of identical design from a NABL recognized laboratory, preferably at
CPRI laboratory. The Type test certificates should not be more than 5 (five) years old. The type rest
certificates should also be accompanied by the drawings of equipment tested so that the test certificates
can be directly linked to the equipments offered. In this regard following points shall also be noted:
3.2.2.
Equipment which have not been type tested as above shall not be accepted. A promise or agreement by
a bidder to have the equipment tested after award of a contract is not acceptable.
3.3.
Type Test reports to be acceptable must relate directly to the equipment offered. Type Test reports for a
higher class/rating of equipment are acceptable with a commitment from bidder that the type test will be
performed free of charge on the particular equipment after the award of contract without asking for
additional time of supply .. Guaranteed and Other Particulars in the formats given in Schedule – A at the
end of this Section. The bid should also be accompanied by manufacturer’s literatures and brochures
3.3.1.
PERSONNEL CAPABILITY: The Bidder must have suitably qualified personnel to fill positions required
for contract implementations. The Bidder will supply information of the key personnel, design &
engineering staff, support staff, field staff giving details of experience in Power transformers
manufacturing and marketing process.
3.3.2.
EQUIPMENT CAPABILITIES: The manufacturers’ laboratory must be well equipped for complete range
of testing of Power transformers. They must have standard power source and standard equipment with
valid calibration certificates. The details of testing facilities available for conducting a) the routine tests
and b) the acceptance tests shall be furnished in a statement. The manufacturers’ laboratory must also
have facilities for stage wise testing of parts during the manufacturing process. The details of these must
also be provided in a statement. Facilities available, if any, for conducting type test may also be
furnished. Detailed list of equipment of the factory used for manufacturing the Power transformers
including the testing equipment with make, year of manufacture, along with flow chart of the
manufacturing process is to be submitted. Bids without these details will be treated as non-responsive
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3.3.3.
LITIGATION HISTORY Bidders shall submit details of all the litigation, arbitration or other claims,
whether pending, threatened or resolved in the last five years, with a cumulative impact of not more than
10 per cent of their total assets. The Purchaser may disqualify bidders in the event that the total amount
of pending or threatened litigation, arbitration or other claims represent more than 50 per cent of their
total assets.
3.4.
BIDDING
3.4.1.
Each Technical Proposal must be accompanied by each of the following information/ documents with
sufficient details along with other documents and information mentioned elsewhere to enable the
purchaser to make an appraisal of the quality and suitability of the material and equipment offered.
3.4.2.
Guaranteed and Other Particulars in the formats given in Section – 5. The bid should also be
accompanied by manufacturer’s literatures and brochures.
3.4.3.
The Bidder’s offer shall include and substantiate data on qualifying requirements such as: Copies of
original documents defining the constitution or legal status, place of registration, and principal place of
business, written power of attorney of the signatory of the Bid to commit on behalf of the Bidder
3.4.4.
Qualifications and experience of key site management and technical personnel proposed for the
Contract
3.5.
3.5.1.
Financial Capability : The bidder’s offer shall including the followingReports on the financial standing of the Bidder, such as profit and loss statements and auditor’s reports
for the past five years.
3.5.2.
Evidence of adequacy of working capital for this contract (access to line (s) of credit and availability of
other financial resources)
3.5.3.
Authority to seek references from the Bidder’s Bankers
3.5.4.
Information regarding any litigation, current or during the last three years, in which the Bidder is
involved, the parties concerned, and disputed amount.
3.6.
Bidders shall also submit proposals of work methods and schedule in sufficient detail to demonstrate the
adequacy of the bidders’ proposals to meet the Purchaser’s requirements and the completion time.
3.7.
Even though the bidders meet the above qualifying criteria, they are subject to be disqualified if they
have:
3.7.1.
Made misleading or false representations in the forms, statements and attachments submitted in proof of
the qualifying requirements,
3.7.2.
Record of poor performance such as abandoning the works, not properly completing the contract,
inordinate delays in completions, litigation history, or financial failures etc.
Terms and conditions which are not specified herein above will be governed by APDCL’s General
Terms and Conditions of supply and erection in force.
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SECTION 4
BID PROPOSAL SHEETS
(To be submitted by bidders)
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Annexure – I
Tender Proforma part – I (Techno-commercial Bid)
NIT NO.CGM (PP&D)/ APDCL/A P 2013-14(Work Component)/Buffer Stock/ PTr/01
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Name and full address of the Tenderer.
Particulars of payment made for Purchase of tender document in
the shape of
Amount of earnest money paid and in the shape of
Whether Sales Tax clearance certificate submitted
Sale Tax Registration No
Pan No (in case of firm must be in the name of firm
Acceptance of guarantee clause of Materials /equipment and
system Installed individually and for integrated operation.
Acceptance of penalty clause
Acceptance of terms of payment
Documentary evidence for manufacturing power transformer
during last five years
Type test certificate from NABL accredited laboratory
Details of manpower and T&Ps available with the firm
Performance certificate from at least two utilities
Guaranteed Technical Particulars as per Annexure II, III and IV
Reports on the financial standing of the Bidder, such as profit
and loss statements and auditor’s reports for the past five years.
Evidence of adequacy of working capital submitted for this
contract (access to line (s) of credit and availability of other
financial resources)
Drawings Submitted With The Bid:
(i)
General outline drawing
(ii)
Height of centre line of HV and LV connectors of
transformers from the rail top level.
(iii)
Dimensions of the largest part to be transported.
(iv)
GA drawings/details of various types of bushing.
(v)
Illustrative & descriptive literature of the Transformer.
List of other documents enclosed
Power Of Attorney for signatory of bid
Yes / No
Yes/ No
Yes/ No
Yes/ No
Submitted/Not submitted
Submitted/Not submitted
Submitted/Not submitted
Submitted/Not submitted
Submitted/Not submitted
Submitted/Not submitted
Submitted/Not
Submitted/Not submitted
Signature with full name
and designation of Bidder or
his/her authorized representative with
seal
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SECTION 5
Schedule of price and Delivery
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Price schedule for 33/11 KV,5MVA Power Transformer
(To be filled by the bidder)
NIT NO.CGM (PP&D)/ APDCL/A P 2013-14(Work Component)/Buffer Stock/ PTr/01
Package-I
Particulars
Tendered quantity
33/11kV, 5MVA power
transformer
6 nos.
Summary sheet
Total cost as per schedule-I
Total cost as per schedule –II
Grand Total
Signature of the Bidder with detail address
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Offered quantity
Schedule-I :Price schedule for 33/11 KV,5MVA Power Transformer
Qty
Unit Ex
factory
price
₹
Excise
duty
……..%
₹
Education
cess
₹
Taxes
CST/VAT
…..%
₹
F&I for any
location
₹
Entry
tax
₹
Total unit
cost
₹
Total
price
₹
3
4
5
6
7
8
9
10
11=(5+6+7+
8+9+10)
12=11x4
No
6
No
No
No
Set
No
6
6
6
6
6
No
6
No
6
Set
No
no
no
no
no
6
6
6
Sl
no.
Item
Unit
1
2
1
2
33/11kV 5MVA transformer
Mandatory Spare
Bushing a. High Voltage
Low Voltage
Neutral Bushing
Complete set of Gaskets for all opening on the Tank requiring Gasket
Magnetic Oil Level Gauge with low oil level Alarm Contacts
Oil Temperature indicator with Alarm and Trip Contacts and maximum
reading pointer
Winding temperature indicator with Alarm and Trip Contacts and
maximum reading pointer
Set of all types of valves comprising one in each type
Silicagel Breather
Buchholz Relay
Air cell/Flexi separator
Pressure relief device
Thermo siphon filter
a
b
c
d
e
f
g
h
I
j
k
l
m
6
6
6
Total
Schedule-II
Cost for supervision of testing and
commissioning of one transformer
(5MVA) at site in ₹
Service tax(for one
transformer) in ₹
Total cost for one
transformer in ₹
Qty
In nos.
Total cost in ₹
1
2
3=1+2
4
5=4x3
6
Bidder without showing breakup rate shall be rejected outright. Excise duty must be mentioned clearly in %. The bidders are to quote rates for all the items
otherwise the bids are liable for rejection.
Signature of the Bidder with detail address
19 | P a g e
Price schedule( for 33/11 KV,10MVA Power Transformer)
(To be filled by the bidder)
NIT NO.CGM (PP&D)/ APDCL/A P 2013-14(Work Component)/Buffer Stock/ PTr/01
Package-II
Particulars
Tendered quantity
33/11kV, 10MVA power
transformer
5 nos.
Summary sheet
Total cost as per schedule-I
Total cost as per schedule -II
Total
Signature of the Bidder with detail address
20 | P a g e
Offered quantity
Schedule-III : Price schedule for 33/11 KV,10 MVA Power Transformer
QTY
Unit Ex
factory
price
₹
Excise
duty
……..%
₹
Educatio
n cess
₹
Taxes
CST/VAT
…..%
₹
F&I for
any
locations
₹
Entry
tax
₹
Total unit
cost
₹
Total price
₹
3
4
5
6
7
8
9
10
11=(5+6+7+8
+9+10)
12=11x4
No
5
No
No
No
5
5
5
Set
5
No
5
No
5
No
5
Set
No
no
no
No
no
5
5
5
5
5
5
Sl
no.
Item
Unit
1
2
1
2
a
b
c
d
e
f
g
h
I
j
k
l
m
33/11kV 10MVA transformer
Mandatory Spare
Bushing i). High Voltage
ii) Low Voltage
Neutral Bushing
Complete set of Gaskets for all opening on the Tank requiring
Gasket
Magnetic Oil Level Gauge with low oil level Alarm Contacts
Oil Temperature indicator with Alarm and Trip Contacts and
maximum reading pointer
Winding temperature indicator with Alarm and Trip Contacts and
maximum reading pointer
Set of all types of valves comprising one in each type
Silicagel Breather
Buchholz Relay
Air cell/Flexi separator
Pressure relief device
Thermo siphon filter
Total
Schedule-IV
Cost for supervision of testing and
commissioning of one transformer
(5MVA) at site in ₹
Service tax(for one
transformer) in ₹
Total cost for one
transformer in ₹
1
2
3=1+2
Qty
In nos.
Total cost in ₹
4
5=4x3
5
Bidder without showing breakup rate shall be rejected outright. Excise duty must be mentioned clearly in %. The bidders are to quote rates for all
the items otherwise the bids are liable for rejection.
Signature of the Bidder with detail address
21 | P a g e
SECTION- 6
Technical specification and
Guaranteed technical particulars
(GTP)
22 | P a g e
TECHNICAL SPECIFICATIONS FOR 33/11kV POWER
TRANSFORMER
1.0 SCOPE OF SPECIFICATION:
1.1. : This specification is intended to cover design, manufacture, assembly and testing at
manufacturer’s works, supply and delivery of three phase 50HZ, 33/11 KV Delta/Star, Vector
Group DYN 11, two windings copper wound outdoor type, oil immersed, naturally air cooled
(ONAN) Power Transformer with off load tap changer for 10MVA , 5 MVA POWER
transformer.
1.2. The transformers offered shall be complete with all parts and accessories which are
necessary for their efficient and satisfactory operation The Transformer and all associated
oil filled equipment shall be supplied complete with insulating new oil required for first filling
including 10% extra oil for future use during commissioning. The Transformer tank shall be
dispatched completely filled with oil and the balance oil shall be supplied in non returnable
sealed drums along with the Transformers.
1.3. Such parts and accessories shall be deemed to be within the scope of this specification
whether specifically mentioned or not. Main tank body may be delivered in unpacked
condition, but delicate parts like indicating meter, radiator, conservator, Pressure relief
valve, equalizer pipe, buchholz relay, thermo siphon filter etc. shall be packed to avoid
damage due to transportation.
1.4. It may be noted that the Power Transformer must meet the following minimum criteria.
Failure to comply with the requirements may results in rejection of the BID as nonresponsive:
1.5. The Manufacturer must have designed, manufactured, type tested and supplied power
transformers of similar rating in at least two power utilities, which are in successful operation
for at least 5 (Five) years as on the date of bid opening. This should be substantiated by
furnishing performance report by the official not below the rank of DGM/SE
1.6. The Manufacturer should have in-house Auto Clave facility
1.7. Impulse Test, Temperature Rise and Loss Measurement shall be carried out at CPRI /
NABL accredited Laboratory.
1.8. The in house testing laboratory of the manufacturer should be NABL accredited.
2.0 : CLIMATIC & ISOKERAUNIC CONDITION:
For the purpose of designing, the following condition shall be considered:
23 | P a g e
1.
2.
Maximum temperature of air in shade
Minimum temperature of air in shade
40°C
3.
Maximum temperature of air in sun
45°C
4.
Maximum humidity
100%
5.
Average number of thunder storm days per
45 Days
6.
annum
Maximum rainfall per annum
3500 mm
7.
Average rainfall per annum
2200 mm
8.
Wind pressure
97.8 Kg/m
9.
Altitude above MSL
100 to 1000 M
2°C
2
3.0
APPLICABLE STANDARDS
Unless otherwise stated, transformer shall be designed, constructed and tested in
accordance with provisions contained in latest revisions of following Indian standards and
Rules.
i. IS : 2026
ii. R.E.C. Manual 10/1976
iii. C.B. I.P. Manual on Transformer
iv. Technical Report 1: Section : A.D. (Revised: 1987)
v. C.B.I.P. Technical Report No. 72 (June: 1989)
vi. Indian Electricity Rules, 1956 (Amended up to date)
vii. IS : 2099 Bushing for alternating voltage above 1000 volt
viii. IS: 6600 Guide for loading of oil immersed transformer
ix. Specification for Transformer oil (IS-335 & IS-1866,1983)
x. Other applicable Indian Standards, or equivalent international
specifications
4.0 GUARANTEES
The bidder shall guarantee among other things the following:
a)
Quality and strength of the material used.
b)
Adequate factors of safety for all parts of equipment to withstand the mechanical
and on electrical stresses developed therein. These will be stated in the tender.
c)
Suitability of the design and workmanship of the equipment for the conditions
envisaged in the specification.
d)
Efficiencies, Temperature rise and other performance data on equipment which
shall be furnished in the tender.
5.0 WARRANTY
5.1. The bidder shall be responsible for replacing at site free of cost any part or parts of the
equipment that may prove faulty or fail manufacturing defects on one or more of the reasons
given in clause stated above within 60 (sixty) months from the date of commissioning or
66(sixty six) months from the date of receipt of the materials at our store in good and
acceptable condition whichever is earlier
5.2. In case of failure of the transformer, the supplier shall take back the faulty transformer from
its plinth for repair at their own cost (or replace the transformer with a new transformer) and
deliver, at their own cost, unload at the destination sub-station transformer plinth within 45
days, from the date of intimation of defects to the satisfaction of the owner, at free of cost. If
the repair/replacement will not be completed within 45 days, then the supplier shall pay
penalty @ 0.5% of the contract price for each calendar week of delay from the end of 45
days from the date of intimation of defects. Also, the Purchaser reserves the right for
forfeiture of the total Composite Bank Guarantee and all the Securities, available with
APDCL, in case the Supplier fails to pay the penalty by one month before the expiry of the
guarantee period. Also, this will be taken as adverse in all future tenders.
5.3. The bidder shall furnish copies of test certificates of materials used for manufacture and also
the test certificates of the tests conducted on the equipment after manufacture. The
contractor shall also furnish the test certificate of bought out components for approval by the
purchaser.
6.0 MISCELLANEOUS
6.1. Padlocks along with duplicate keys as asked for various valves, marshalling box etc. shall
be supplied by the contractor, wherever applicable.
6.2. Foundation bolt for wheel locking devices of Transformer shall be supplied by the bidder.
24 | P a g e
7.0 DELIVERY SCHEDULE:
The equipment shall be delivered FOR Destination as per schedule specified in the BPS
8.0 CONFLICT IN CLAUSE:
In case of any conflict between the Specific Technical Requirements and General Technical
Requirements the requirements indicated as Specific Technical Requirement shall prevail
over the General Technical Requirements
9.0 DEVIATION FROM SPECIFICATION
9.1. Normally the offer should be as per Technical Specification without any deviation. But any
deviation felt necessary to improve utility, performance and efficiency of equipment or to
secure overall economy shall be mentioned in the ‘Schedule of deviations” with full
justification, supported by documentary evidence. Such deviations, suggested, may or may
not be accepted. But deviations, not mentioned in the “Deviation Schedule” will not be
considered.
10.0 DRAWINGS INCORPORATING THE FOLLOWING PARTICULARS SHALL BE SUBMITTED WITH THE BID:
10.1.
The following drawings and details shall be furnished in triplicate along with the bid :
10.2.
General Arrangement outline drawing with plan, elevation and end views showing various
dimensions of transformer and its vital component including height of the bottom most portion
of bushing from the bottom of base channel and also indicating thereon physical centre line
and position of centre of gravity.
10.3.
Details of various types of bushing.
10.4.
Three copies of sketches for height of crane hook above ground for lifting and untanking core,
shipping dimensions, complete lists of fittings and devices, net weights of core, winding, tank,
radiator, oil, conservator and total weight, fixing arrangement of transformer in foundation.
10.5.
Illustrative & descriptive literature of the Transformer.
10.6.
Maintenance and operation Instructions.
10.7.
Type test certificates of similar transformers.
11.0 RATING AND GENERAL PARTICULARS:
11.1.
Type: Core type, three phase, oil immersed, step down, two winding, copper conductor
wound transformer for outdoor installation.
11.2.
Standard Rating:
Continuous with off circuit taps as mentioned in the schedule of requirement.
11.3.
Continuous Maximum Rating and Overloads:
As regards maximum rating and temperature rise, all transformers shall comply with the appropriate
requirement of Indian Standards for the purpose of consideration of maximum temperature rise of
oil and winding, the following ambient temperatures are assumed.
i. Cooling medium : Air
ii. Maximum Ambient Air temperature: 50 °C.
iii. Maximum daily average ambient Air temperature: 40 °C.
iv.
11.4.
11.5.
25 | P a g e
Maximum yearly weighted average temperature: 32 °C .
The transformer may be operated without danger on any particular tapping at the rated KVA
provided the voltage does not vary by more than +10% of the voltage at that tapping.
The transformer should be suitable for continuous operation with a frequency variation
of +/-3% from normal 50Hz. Combined voltage and frequency variation should not
exceed the rated V/f ratio by 10%
11.6.
11.7.
11.8.
11.9.
DUTY UNDER FAUALT CONDITION
It is to be assumed that normal voltage will be maintained on one side of the Transformer when
there is a short circuit between phases or to earth on the other side.
The transformer may be directly connected to an underground or overhead line and may be
switched into and out of service together with or without its associated incoming/outgoing line.
The thermal ability to withstand short circuit shall be two seconds (2 Sec.) without injury for 3
phase dead short circuit at the terminals.
12.0 GENERAL TECHNICAL PARAMETERS
SN
1.
2.
3.
4.
5.
6.
7.
8.
Particulars
Rating
Number of Phases
Vector group
Type of installation
Frequency
Cooling Medium
Type of Cooling
Highest continuous system Voltage
High Voltage
Low Voltage
Winding Connection
Winding Material
High Voltage Winding
Low Voltage Winding
Method of System Earthing
Core Material
9.
10.
11.
12.
13.
14
15 Type of Tap Changer
16
17
18
19
20
A
Range of Tapping
Maximum Current Density
Maximum flux density
Type of Insulation and Insulation Level
a) Type of insulation
b) One minute power frequency withstand
Voltage(kV rms)
c) Lightning Impulse withstand voltage
Terminal Details
33kV Termination
B
11 KV Termination
21 Maximum Temperature rise over
ambient of 50° C
a) Temperature rise of top oil
b) Temperature rise of winding
C) Maximum Winding temperature in Deg. C
d) Maximum Permissible value of Average
temperature of winding after 3 sec Maximum
Permissible short circuit:
12.1.
12.2.
26 | P a g e
33/11 KV Power Transformer
5MVA & 10 MVA
Three
Dyn-11
Outdoor
50HZ ( +/- )3%
Insulating Oil
ONAN
:36kV
:12kV
Electrolytic Copper
DELTA
STAR
Solidly grounded on LV side
CRGO ( M-4 / higher grade)
OFF Load
(+) 3% to (-) 9% in steps of 3% on
HV side
2.5 Amp/ sqmm
1.6 Tesla
33kV
11kV
Uniform
Uniform
70kV
28kV
170
75
(i) ACSR/AAAC Wolf conductor,
Bus, (or IPs tube as applicable) for
connecting to bushing terminals.
2
Cable 300/630 mm , 1-core Al.
Armoured XLPE Cable
40° C (measured by
Thermometer
45° C
(measured by
resistance)
105° C
250° C
Over load capacity
As per IS: 6600 or equivalent international specifications
NOISE LEVEL AT RATED VOLTAGE & FREQUENCY:
As per NEMA Pub TR-1.
13.0 GUARANTEED LOSSES
Sl No
Particular
5 MVA
10 MVA
1.
Impedance at rated MVA at 75° C
without (-) ve tolerance
7.15%
8.35 %
2.
No Load Loss (at rated voltage and
rated current)
4.0KW
6 KW
3.
Load Loss at 75° C (at rated voltage and
rated current)
24KW
44 KW
The bidder shall state both no load loss and load loss at rated voltage and frequency and loss
figures shall be firm and guaranteed. For Losses more than the above specified value the offer
will be rejected outright. However If the test figure of losses is less than the guaranteed value,
no bonus will be allowed. Any change in the figure assigned for transformer losses will not be
permitted after opening of bids and bid evaluation will be carried out on the basis of
information made available at the time of bid opening.
14.0
14.1.
15.0
15.1.
16.0
16.1.
SHORT CIRCUIT CALCULATIONS
Manufacturer shall submit theoretical calculations in support of the ability to withstand
short circuit on consideration of highest value that may occur.
PERFORMANCE CERTIFICATES
Copies of Performance Certificates of similar equipment supplied to various utilities shall
be furnished along with Tender.
LIST OF PAST SUPPLIES
The bidder shall furnish documents in support of previous supply, delivery of similar
equipment indicating thereon names of the organization, quantity ordered, quantity
supplied along with tender.
17.0 DESIGN, STANDARDIZATION AND GENERAL CONSTRUCTION FEATURES
17.1.
.All material used shall be best quality and of the class most suitable for working under the
conditions specified and shall withstand the variations of temperature and atmospheric
conditions without distortion or deterioration or setting up of undue stresses which may
impair suitability of the various parts for the work which they have to perform.
17.2.
Large parts, particularly removable ones, shall be interchangeable. Pipes and pipe fittings,
screws, studs, nuts and bolts used for external connections shall be as per the relevant
standards. Steel bolts and nuts exposed to atmosphere shall be of hot deep galvanized
17.3.
Nuts, bolts and pins used inside the transformers and tap changer compartments shall be
provided with lock washers or locknuts. Exposed parts shall not have pockets where water
can collect.
17.4.
Internal design of transformer shall ensure that air is not trapped in any location. Material
in contact with oil shall be such as not to contribute to the formation of acid in oil. Surface
in contact with oil shall not be galvanized or cadmium plated.
17.5.
Labels, indelibly marked shall be provided for all identifiable accessories like relays,
switches, current transformers etc. All label plates shall be of in corrodible material.
17.6.
All internal connections and fastening shall be capable of operating under overloads and
over-excitation, allowed as per specified standard without injury.
27 | P a g e
17.7.
Transformers and accessories shall be designed to facilitate proper operation, inspection,
maintenance and repairs. No patching, plugging, shining or other, such means of
overcoming defects, discrepancies or errors will be accepted.
18.0 CORES :
18.1.
18.2.
18.3.
i)
Invoice of the supplier
ii)
Mill’s Test Certificate
iii)
Packing Lists
iv)
Bill of landing
v)
18.4.
18.5.
The Core shall preferably be boltless and step lap design and CRGO to be procured
directly from CRGO supplier or from their accredited agent supported by necessary
documentary evidence for.
Core shall have magnetic coating as insulation. Successful bidder will offer the core for
inspection and/or approval by the purchaser during manufacturing stage.
Manufacturer’s call notice for the purpose should be accompanied with the following
documents as applicable as a proof towards use of prime core materials:
Bill of entry Certificate to Customs Core materials shall be procured either from the core
manufacturer or through their accredited marketing organisation of repute. Bidder should
preferably have in-house Core cutting facility for proper monitoring and Control on quality.
The materials used for insulation shall have high inter lamination resistance and rust
inhibiting property. It shall not have any tendency to absorb moisture or to react with
insulating oil.
The assembled core shall be securely clamped on the limbs and yoke with uniform
pressure so as to minimise noise emission form it.
The top main core clamping structure shall be connected to the tank body by a copper
strap. The bottom clamping structure shall be earthed by one or more of the following
methods
1.
by connection through vertical tie rods to the top structure
2.
by direct metal to metal contact with the tank base by the weight of the core and
windings,
3.
18.6.
18.7.
18.8.
18.9.
18.10.
28 | P a g e
by a connection to the top structure on the same side of core the main earth
connection to the tank.
All parts of the cores shall be robust design capable of withstanding any shocks to which
they may by subjected during lifting, transport, installation and service.
Adequate lifting lugs shall be provided to enable the core and winding to be lifted.
Adequate provision shall be made to prevent movement of the core and winding relative to
the tank during transport and installation or while in service.
The supporting frame work 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.
The insulation structure for the core to bolts and core to clamp plates shall be such as to
withstand a voltage of 2000 V AC at 50HZ for one minute
Manufacturer should have In-house core-cutting facility to avoid mixing of prime grade core with non
prime grade and to control bar level as per design specification.
Manufacturer should have in-house VPD machines to ensure vapour phase drying of core-coil
assembly before tanking. This is to avoid any trapped moisture inside winding insulator/ CCA.
Manufacturer should have installed capacity of minimum 20000 MVA per annum.
Manufacturer should have complete in-house testing facilities including Impulse Generator, Heat Run
Test Facilities, FRA kit, Tan Delta kit etc.
Similar transformer with same MVA and losses as per specification should be short circuit tested from
CPRI/ ERDA within last five years.
19.0 FLUX DENSITY OF CORE
19.1.
The maximum flux density in any part of the core and yokes at principal (normal) tapping
and at rated frequency shall not exceed 1.6 Tesla (16000 lines per sq.cm) at normal
voltage and 1.9 Tesla (19000 lines per sq.cm) under overvoltage condition as specified in
this specification.
19.2.
Prior to inspection and testing of the Transformer the supplier shall submit on request
following curves of the core manufacturer.
i) Flux density vs Core loss.
ii) Flux density vs Excitation
20.0 WINDING:
20.1.
20.2.
20.3.
20.4.
20.5.
20.6.
20.7.
20.8.
29 | P a g e
All windings shall be fully insulated. Power transformer shall be designed to withstand the
impulse and power frequency test voltages specified in clause no. 9.01.
The windings shall be designed to reduce to a minimum the out of balance forces in the
transformer at all voltage ratios.
The insulation of Transformer winding and connections shall be free from insulating
material liable to soften, ooze out shrink or collapse and shall be non-catalytic and
chemically inactive to transformer oil during service.
The stacks of windings shall receive adequate shrinkage treatment before final assembly.
Adjustable device shall be provided for taking up any possible shrinkage of coils in
service.
All the insulating materials to be used in the transformer shall preferably be of class- A
insulation as specified in Indian Standards. The test certificate of the raw materials shall
be made available by the Transformer manufacturer on request during inspection and
testing.
The coil clamping arrangement and the finished dimensions of any oil ducts shall be such
that it will not impede the free circulation of oil through the ducts.
The windings and connection of transformer shall be braced to withstand shocks which
may occur during transport or due to switching short circuit and other transient conditions
during service.
Coil clamping rings, if provided shall be of steel or suitable insulating material. Axially
laminated material other than Bakelite paper shall not be used.
21.0 INTERNAL EARTHING ARRANGEMENTS:
21.1.
General : All metal parts of the transformer with the exception of the individual core
laminations, core bolts and associated individual clamping plates shall be maintained at
same fixed potential.
21.2.
Earthing of coil clamping rings: Where coil clamping rings are of metal at earth
potential, each ring shall be connected to the adjacent core clamping structure on the
same side of transformer as the main earth connection.
22.0 TANKS:
22.1.
Construction : Conventional type tank shall be constructed. The Transformer tank and
cover shall be fabricated from good commercial grade low Carbon steel suitable for
welding and of adequate thickness. The tanks of all transformers shall be complete with all
accessories and shall be designed so as to allow the complete transformer in the tank and
filled with oil, to be lifted by crane or jacks, transported by rail, road without overstraining
any joint and without causing subsequent leakage of oil.
22.2.
The main tank body shall be capable of withstanding vacuum gauge pressure 68.0 KN per
Sq, metres ( 500 mm. of HG).
22.3.
The under carriage of the tank shall be made of channel of suitable size and design. The
base of each tank shall be so designed that it shall be possible to move the complete
transformer unit by skidding in any direction without injury when using plate or rails.
22.4.
Where the base is of a channel construction, it shall be designed to prevent retention of
water. Tank stiffeners shall be designed to prevent retention of water.
22.5.
Wherever possible the Transformer tank and its accessories shall be designed without
pockets wherein gas may accumulate. Where pockets cannot be avoided, pipes shall be
provided to vent the gas into the main expansion pipe.
22.6.
All joints other than those which may have to be broken shall be welded when required
they shall be double welded. All bolted joints to the tank shall be fitted with suitable oil tight
gaskets which shall give satisfactory service under the operating conditions and
guaranteed temperature rise conditions. Special attention shall be given to the methods of
making hot oil tight joints between the tank and the cover as also between the cover and
bushing and all other outlets to ensure that the joints can be remade at site satisfactorily.
23.0 TANK COVER
23.1.
:Each tank cover shall be of adequate strength and shall not distort when lifted. Inspection
openings shall be provided as necessary to give easy access to bushings or changing
ratio or testing the earth connection. Each inspection opening shall be of ample size for
the purpose for which it is provided. The tank cover and inspection cover shall be provided
with suitable lifting arrangement.
23.2.
The tank cover shall be fitted with pockets for thermometer and for the bulbs of Oil and
Winding temperature indicators. The thermometer pocket shall be fitted with a captive
screwed top to prevent the ingress of water. Protection shall be provided, where
necessary, for each capillary tube. The pocket shall be located in the position of maximum
oil temperature and it shall be possible to remove the instrument bulbs without lowering
the oil in the tank.
23.3.
Turrets should be provided on tank cover to house the bushings. The turrets of both HV &
LV bushings should be connected through pipes with main tank Buchholtz Relay pipe to
drive out trapped air or should have air release plug to drive out trapped air as the case
may be.
30 | P a g e
24.0 OFF LOAD TAP CHANGER.
24.1.
The transformers shall be provided with voltage control equipment of the tap changing
type on the HV side for HV variation of +3% to (-) 9% in equal 5 steps of 3.0% for varying
its effective transformation ratio whilst the transformers are off-load. The tap changing
device shall be off-circuit type. The tap changing shall be carried out by means of an
externally operated tapping switch capable of being located and locked in any required
position.
24.2.
The location of tap changing device shall be such that an operator can very easily change
the tap, while standing on the ground without the aid of any climbing platform. A warning
plate indicating that switch shall not be operated in “ON” position is to be provided.
24.3.
The contact resistance between the contact points should be less than 20µΩ. The
manufacturer should show the resistance to the inspector at the time of inspection.
25.0
CONSERVATOR VESSELS.
25.1.
Conservator vessels : The conservator should be air cell/ atmoseal type to prevent direct
contact of Transformer oil with atmospheric air for retarding oxidation contamination of oil.
The Air cell shall be made from suitable material with inner coating resistant to transformer
oil & outer coating resistant to ozone & weathering.
25.2.
The conservator shall be provided with necessary valves to drive out the air in the space
between conservator wall & air cell during filling of oil, drain valves for complete draining of
oil and cut off valves etc.
25.3.
The conservator complete with necessary valves shall be provided in such a position as
not to obstruct the electrical connections to the transformer from H.V & L.V SIDE.
25.4.
The conservator shall be a capacity to meet the requirement of expansion of the total cold
oil volume in the Transformer & cooling equipment.
25.5.
The conservator shall be designed so that it can drain oil completely by means of the drain
valve provided when mounted. One end of the conservator shall be bolted into position so
that it can be removed for cleaning purpose.
25.6.
The conservator shall be provided with different valves for filling of oil manually at site.
26.0 OIL GAUGES
26.1.
Normally one Magnetic type oil gage shall be provided. The oil level at 30 Deg. C. shall
be marked on the gauge.
26.2.
CONNECTION : The oil connection from the transformer tank to the conservator vessel
shall be arranged at a raising angle of 3 to 9 degrees to the horizontal up to the Buchholtz
Relay and shall consist of pipe with inside diameter 50 mm./80 mm. as per capacity of the
Transformer and as per IS:3639 or equivalent international specifications.
26.3.
Two valves shall be provided between the conservator & Transformer main tank to cut off
the oil supply to the transformer after providing a straight run of pipe for at least a length of
five times the internal diameter of the pipe on the tank side of the Gas and Oil actuated
Relay and at least three times the internal diameter of the pipe on the conservator side of
the Gas and Oil actuated Relay. The valves should be fitted on both side of the Gas and
Oil Actuated Relay.
27.0 BREATHER :
27.1.
Each conservator vessel shall be fitted with a glass container type breather in which
silicagel is dehydrating agent and so designed that the passage of air through the silicagel
the external atmosphere is not continuously in contact with the oil.
.
The moisture absorption indicated by a change in colour of the tinted crystals shall
be easily visible from the distance.
27.2.
All breathers shall be mounted at approximately 1400 mm above ground level and shall
be connected to the air cell of the conservator through pipe for the purpose of breathing
during contraction or expansion of the air cell.
31 | P a g e
28.0 THERMO SIPHON FILTER ARRANGEMENT
28.1.
Thermo siphon filter arrangement shall be provided with the transformer for preserving the
quality of transformer oil. Suitable instructions required to be followed for commissioning,
dismantling and maintenance of the filter arrangement, re-generation and storage of the
absorbent etc, must be included in the instruction manual. A detailed drawing showing
internal arrangement of the filter shall also be submitted.
29.0 BUSHINGS
29.1.
Bushings for HV side 36 KV, 630 Amp, Insulation level :70KV/170KV and for LV side 12
KV, 630 Amp, Insulation level :28KV/70KV) shall be of solid porcelain type. These
bushings shall be suitable for bare ACSR Wolf/ Panther conductor connections.
29.2.
The bushing shall have sufficient insulation to avoid leakage to ground and shall be so
located as to provide adequate electrical clearance between bushing or various voltages
and between bushings and grounded parts. The insulation class of the high voltages
neutral bushing shall be properly co-ordinated with the insulation class of the neutral of the
high voltage winding.
29.3.
Stresses due to expansion and contraction in any part of the bushing insulator shall not
lead to the development of defects. Outdoor insulators and fittings shall be unaffected by
atmospheric conditions due to weather, fuses, ozone, acids, dust and rapid changes of air
temperature. Any stress shield shall be considered as integral part of the bushing
assembly.
29.4.
Porcelain shall not engage directly with hard metal and where necessary gaskets shall be
interposed between the porcelain and the fittings. All porcelain clamping surface in contact
with gasket shall be accurately grounded and free from glaze
29.5.
Fixing material used shall be of suitable quality and properly applied and shall not enter
into chemical action with the metal parts or cause fracture by contraction expansion in
service. Cement thickness shall be as small and even as possible and proper care shall
be taken to centre and locate individual parts correctly during cementing. All porcelain
insulators shall be designed to facilitate clearance.
29.6.
Each porcelain bushing or insulator, and paper bushing shall have marked upon it the
manufacturer’s identification mark, and such other marks as may be required to assist in
the representative selection of batches for the purpose of the sample tests.
29.7.
Clamps and fittings shall be made of steel and galvanized. The bushing flanges shall not
be re-entrant type (shape) which may trap air.
29.8.
Each bushing shall be so coordinated with the transformer insulation that the flashover will
occur outside the tank.
29.9.
All porcelain used in bushings shall be of wet process, homogeneous and free from
cavities or other flaws. The glazing shall be uniform in colour (brown) and free from
blisters, burns and other defects. Porcelain shall be thoroughly vitrified and shall be
impervious to moisture.
29.10.
All bushing shall have puncture strength greater than dry flashover value.
29.11.
Creepage distance will be kept 27 mm/KV. Bushings may be provided with weather shield.
29.12.
The bidder is requested to give the guarantee withstand voltage for the above and also
furnish a calibration curve with different settings of the co-ordination gap to enable the
purchaser to decide the actual gap settings. Tenderer’s recommendations are also invited
in this respect. During spark gap flashover, the arc shall remain away from the housing
insulator.
29.13.
Each terminal (including neutral) shall be distinctly marked and coloured for phase voltage
and phase rotation on the primary secondary and tertiary sides in accordance with the
diagram of connection supplied with the transformer, the system of marking shall conform
IS 2026-1962 amended upto date.
29.14.
Stress due to expansion and contraction in any part of the bushing shall not lead to
deterioration.
29.15.
Bushing shall be designed and tested to comply with the applicable standards.
32 | P a g e
29.16.
29.17.
29.18.
29.19.
29.20.
29.21.
29.22.
Bushings rated for 400A and above shall have non-ferrous flanges and hardware.
Fittings made of steel or malleable iron shall be galvanized.
Bushing shall be so located on the transformer that full flashover strength will be utilized.
Minimum clearances as required for the BIL shall be realized between live parts and live
parts to earthed structures.
All applicable routine and type tests certificates of the bushings shall be furnished for
approval.
Bushings shall be supplied with bimetallic/terminal connectors/ clamp suitable for fixing to
bushing terminal and the PURCHASER’S specified conductors. The connectors/clamp
shall be rated to carry the bushing rated current without exceeding a temperature rise of
55° C over an ambient of 40° C. the connector/ clamp shall be designed to be corona free
at the maximum rated line to ground voltage.
Bushing of identical voltage rating shall be interchangeable.
Each bushing shall be so coordinated with the transformer insulation that all flashover will
occur outside tank.
30.0 FILTER AND DRAIN VALVES, SAMPLING DEVICES AND AIR RELEASE PLUGS :
30.1.
Each Transformer shall be fitted with the following :
30.2.
The filter and drain valves as specified.

A drain valve as below shall be fitted to each conservator. For diameter upto 650 mm :
Size of the valve 15 mm : for diameter above 650 mm : Size of the valve 25 mm.

Suitable oil sampling device shall be provided at the top and bottom of the main tank. The
sampling device shall not be fitted on the filter valves specified above.

One 15mm air release plug on the main tank of the Transformer.
30.3.
All other valves opening to atmosphere shall be fitted with blank flanges.
Valves shall be of forged carbon steel upto 50 mm size and of gun metal or of cast iron
bodies with gun metal fittings for sizes above 50 mm. They shall be of full way type with
screwed ends and shall be opened by turning counter clock wise when facing the hand
wheel. There shall be no oil leakage when the valves are in closed position.
30.4.
Each valve shall be provided with an indicator to show the open and closed position and
shall be provided with facility for padlocking in either open or closed position. All screwed
valves shall be furnished with pipe plugs for protection. Padlocks with duplicate keys shall
be supplied along with the valves.
30.5.
All valves except screwed valves shall be provided with flanges having machined faces
drilled to suit the applicable requirements. Oil tight blanking plates shall be provided for
each connection for use when any radiator is detached and for all valves opening to
atmosphere. If any special radiator valve tools are required, the Contractor shall supply
the same.
30.6.
Each transformer shall be provided with following valves on the tank so located as to
completely drain the tank.

Two filter valves on diagonally opposite corners, of 50 mm size.

Oil sampling valves not less than 8 mm at top and bottom of main tank
30.7.
Valves between radiators and tank.
30.8.
Valve prior to and after the Buchholz Relay.
31.0 COOLING PLANT
31.1.
General :Radiators shall be so designed as to avoid pockets in which moisture may collect
and shall withstand the pressure tests.
31.2.
The radiator tubes / fins shall be seamless, made of mild steel having as minimum wall
thickness of approx. 1.2mm and a clean bright internal surface free from dust and scale.
They shall be suitably braced to protect them from mechanical shocks, normally met in
33 | P a g e
31.3.
31.4.
31.5.
31.6.
31.7.
31.8.
32.0
32.1.
32.2.
32.3.
transportation and to damp the modes of vibration transmitted by the active part of the
transformer in service.
Each cooler unit shall have a lifting eye.
Radiator Valves: The butterfly or similar metal valves shall be provided for isolating
detachable radiator assembly.
One cock each at the bottom of radiator stack shall be provided for draining oil from
radiator stacks.
Air release plug each at the top of radiator stack shall be provided for release of air from
radiator stack.
Removable blanking plates shall be provided to permit the blanking off the main oil
Connection of each cooler.
Radiator fixing bands in top & bottom of radiators are to be provided to minimise the
vibration of the same.
LIFTING AND HAULAGE FACILITY :
Each tank shall be provided with Lifting lugs suitable for lifting of transformer complete
with oil.
A minimum of four jacking lugs, in accessible positions to enable the transformer complete
with oil to be raised or lowered using hydraulic or screw jacks .
The minimum height of the lugs above the base shall be as follows
(a) for transformers up to and including 10 tones weight-300mm
(b) for Transformers above 10 tones weight – 500 mm
32.4.
Suitable haulage holes shall be provided.
33.0 INSULATING OIL :
33.1.
The Transformer and all associated oil filled Equipment shall be supplied complete with
insulating new oil required for first filling including 10% extra oil for future use during
commissioning. The Transformer tank shall be dispatched completely filled with oil and the
balance oil shall be supplied in non returnable sealed drums along with the Transformers.
33.2.
The Insulating oil shall conform to the requirement of IS:335 or equivalent international
specifications.
34.0 PRESSURE RELIEF DEVICE :
34.1.
Pressure relief device shall be provided of sufficient sizes for rapid release of pressure
that may be generated within the tank, and which might result in damage to the
equipment. The device shall operate at a static pressure of less than the hydraulic test
pressure for transformer tank. Means shall be provided to prevent ingress of rain.
34.2.
It shall be mounted on the cover of the main tank and shall be designed to prevent gas
accumulation.
34.3.
Spring loaded setting type Pressure Relief Valve having suitable opening Port hole
according to the capacity of the transformers should be provided.
34.4.
The pressure relief valve should have provision of visual indication for opening of the valve
and also Contract/Micro Switch arrangement for alarm/Tripping Function.
35.0 AXLES AND WHEELS :
35.1.
The Transformer shall be provided with flanged bi-directional wheels as mentioned below :

Flanged wheel suitable for use on a 1435 mm / 1676 mm gauge track.
34 | P a g e
35.2.
35.3.
The wheels shall be suitable for being turned through an angle of 90 Deg. and locked in
that position when the tank is jacked up.
All wheels shall be detachable and shall be made of Cast Iron or Steel. Suitable locking
arrangement shall be provided to prevent the accidental movement of the transformer.
36.0 CLEANING & PAINTING
36.1.
Before painting or filling with oil all galvanised parts shall be completely cleaned and free
from rust, scale and grease and all external surface cavities on castings shall be filled by
metal deposition.
36.2.
The interior of all transformer tanks and other oil filled chambers and internal structural
steel work shall be thoroughly cleaned of all scale and rust by sand blasting or other
approved method. These surfaces shall be painted with hot oil resisting varnish or paint.
Unexposed welds need not be painted.
36.3.
Except for nuts, bolts and washers, which may have to be removed for maintenance
purposes, all external surfaces shall receive a minimum of three coats of paint.
36.4.
The primary coat shall be applied immediately after cleaning. The second coat shall be of
oil paint of weather resisting nature and preferably of a shade or colour easily
distinguishable from the primary and final coasts shall be applied after the primary coats
have been touched up where necessary.
36.5.
The final coat shall be of glossy oil and weather resisting non fading paint of Dark
Admiralty Grey shade no. 632 of IS:5.
36.6.
Primer paint shall be ready made zinc chrome as per IS: 104: Intermediate and final coats
of paint shall be as per IS: 2932 or equivalent international specifications.
36.7.
All interior surfaces of mechanism chambers and kiosks except those which have received
anti-corrosion treatment shall receive three coats of paint applied to the thoroughly
cleaned metal surface as per procedure mentioned above. The final coat shall be of a light
coloured anti-condensation mixture.
36.8.
Any damage to paint work incurred during delivery shall be made good by the
manufacturer by thoroughly cleaning the damage portion and applying the full number of
coats of paint that had been applied before the damage was caused.
37.0 EARTHING TERMINAL
37.1.
Two earthing terminals capable of carrying the full amount of lower voltage short circuit
current of transformer continuously for a period of 5 Second Provision shall be made at
positions close to each of the bottom two corners of the tank for bolting the earthing
terminals to the tank structure to suit local condition.
38.0 TEMPERATURE INDICATING DEVICE:
38.1.
Oil temperature indicator with two electrical contacts for alarm and trip purposes, shall
be provided with anti vibration mounting. The oil temperature indicator shall be housed in
the marshalling box.
38.2.
The winding temperature indicator with two electrical contacts for alarm & trip purposes
shall be provided with anti vibration mounting. The winding temperature indicator shall be
housed in the marshalling Box.
The Oil temperature and Winding temperature indicators shall be hybrid type of indicating
meters having remote indication for SCADA purposes. The Oil and Winding temperature
indicator should be of renowned make preferably of “Precimeasure”.
38.3.
35 | P a g e
38.4.
The signaling contact of WTI & OTI shall be set to operate at the following temperature:
OIL :
Alarm-85 °C, Trip – 95 ° C
WINDING : Alarm-100 °C, Trip – 110 °C
38.5.
The tripping contacts of indicator shall be adjustable to close the winding temperature
indicator between 60 Deg.C and 120 Deg.C. The alarm contacts of indicator shall be
adjustable to close between 50 deg.C & 100 Deg.C.
38.6.
All contacts shall be adjustable on a scale and shall be accessible on removal of the
cover. The Temperature indicators shall be so designed that it shall be possible to check
the operation of contacts and associated Equipments.
38.7.
For measuring winding temperature a heater coil fed from a C.T. has to be provided on
the pocket for winding temperature indicator bulb. The connection from C.T. to heater
should be through a link arrangement on the tank cover suitably housed in a weather proof
box so that C.T. current and heater coil resistance can be checked. WTI C.T. secondary
should be of 5 Amps, rating.
38.8.
Accuracy class of both OTI and WTI shall be ±1% or better.
39.0 MARSHALLING BOX
39.1.
A sheet steel 3.15mm thick vermin proof, well ventilated and weather proof
marshalling box of a suitable construction shall be provided for the transformer
ancillary apparatus. The box shall have domed or sloping roofs and the interior &
exterior painting shall be in accordance with painting clause specified. The degree of
protection shall be IP-55.
39.2.
The marshalling box shall accommodate.

Winding and oil temperature indicator.

Terminal Blocks and gland plates for incoming and outgoing Cables.

One space heater operated by 220 V.A.C. Aux. Supply, Cubicle illuminating lamp with door
switch.
39.3.
All incoming cables shall enter the kiosk from the bottom and the gland plate shall
not be less than 450 mm from the base of the box. The gland plate and associated
compartment shall be sealed in suitable manner to prevent the ingress from the
cable trench
39.4.
All the above equipment shall be mounted on panels and back of panel wiring shall
be used for Interconnection. The temperature indicators shall be so mounted that the
dials are visible by standing at ground level.
39.5.
Door of the compartment shall be provided with glass window of adequate size.
Ventilation louvers shall be provided.
39.6.
The schematic diagram of the circuitry inside the marshalling box be prepared and
fixed inside the door
40.0 GAS AND OIL ACTUATED RELAYS
40.1.
36 | P a g e
Each transformer shall be provided with gas and oil actuated Relay (Buchholtz Relay)
equipment conforming to IS:3637 or equivalent international specifications, double float type
with one set of alarm contacts, one set of trip contacts and a testing pet cock. The contacts
shall be wired with a P.V.C. armoured cable.
40.2.
A machined surface shall be provided on the top of Relay to facilitate the setting of Relay
and to check the mounting angle in the pipe and cross level of the Relay.
40.3.
The pipe work shall be so arranged that all gas arising from the Transformer shall pass into
the gas and oil actuated Relay. The oil circuit through the Relay shall not form a delivery
path in parallel with any circulating oil pipe.
41.0 RATING DIAGRAM AND PROPERTY PLATES :
41.1.
The following plates shall be fixed to the transformer tank at a suitable height so that the
particulars could be read by standing at ground level.
41.2.
A rating plate bearing the data specified in the relevant clauses of IS:2026 including figures
of temperature rise of oil and winding and high voltage test values, that the equipment
belongs to APDCL with reference of purchase order is also to be indicated.
41.3.
A diagram plate showing the internal numbering of taps, tapping switch connection of
windings and also the voltage vector relationship in accordance with IS:2026 or equivalent
international specifications and in addition a plan view of the transformer giving the correct
physical relationship of the terminals. No load voltage shall be indicated for each tap. Details
of C.T particulars w.r.o phase, Neutral &WTI CT.
42.0 CENTRE OF GRAVITY :
42.1.
The centre of gravity of the assembled transformer shall be low and as near the vertical
centre line as possible. The transformer shall be stable with or without oil.
42.2.
If the centre of gravity is eccentric relative to track either with or without oil, its location shall
be shown on the outline drawing.
43.0
FOUNDATION :
43.1.
The tenderer shall furnish foundation plan of the transformer showing the fixing arrangement
of the transformer so that the purchase may be able to finalize the foundation drawings.
44.0 TEST AND INSPECTION :
44.1.
Routine Tests :
44.2.
All transformers shall be subjected to the following routine tests at the manufacturer’s
works. The tests shall be carried out in accordance with the details specified in IS:2026 or
equivalent international specifications.
i.
Measurement of winding resistance.
ii.
Measurement of turns ratio for all sets windings on each tap
iii.
Polarity and phase vector relationship.
iv.
Measurement of no load loss and no load current.
v.
Measurement of impedance voltage at normal , maximum and minimum tap
vi.
Measurement of insulation resistance between windings and between windings and
earth
vii.
Measurement of load loss
viii.
Induced over voltage withstand test
ix.
37 | P a g e
Separate source voltage withstand test
x.
Oil Leakage gas collection, oil surge and voltage test on gas and oil actuated relay for
on load tap changer
xi.
Magnetic balance test
xii.
Testing of Phase & Neutral C.T., as applicable, in accordance with provisions in the
relevant I.S
xiii. Oil leakage test of transformer tanks at a pressure equals to the normal pressure plus 35
KN/ sq.M measured at the base of tank
.
44.3.
Type Test
44.4.
In addition to routine Tests mentioned above the transformer shall be subjected to all
kinds of Type and Acceptance Test in accordance with Relevant I.S. (IS:2026) or
equivalent international specifications with latest amendment if any.
44.5.
Bidder should submit Type Test report from NABL/Govt. approved Laboratories
along with their offer having identical technical parameters as that of the tendered
item failing which their offer may not be technically accepted.
44.6.
However, if it is found that the bidder has submitted Type tests Report but those
have not been conducted on identical Design of equipment/material as per
specification of APDCL, the same may be accepted subject to the following
conditions: APDCL at his discretion request the successful bidders to conduct
Type Tests on identical design as per specification
44.7.
Such Type tests/special tests, if required to be carried out at NABL/Govt. approved
Laboratories in presence of APDCL engineers for which no extra cost shall be
charged to the APDCL.
44.8.
However, the bidders who have not submitted such Type Test/Dynamic Short Circuit Test
report but if their offer is considered technically acceptable by the purchasers on the basis
of other credentials, they will have to carry out such tests at NABL/Govt. approved
Laboratories in presence of APDCL engineers before effecting physical delivery against
Purchase Order for which no extra cost shall be charged to the APDCL. Routine Test has
to be carried out in presence of APDCL engineers before carrying out type test.
45.0 INSPECTION AND TESTING
(A) STAGE INSPECTION
Stage inspections of raw materials i.e. Tank, Core, Winding, Bushing, Insulating Materials etc. will
be carried out in preassembled condition and final inspection will be carried out on finished product.
Out of the whole lot of respective capacity, one
Transformer will be dissembled for verification of design parameter during final inspection.
a) Tank and Conservator
(i).
Inspection of major weld.
(ii).
Crack detection of major strength weld seams by dye penetration test.
(iii).
Check correct dimensions between wheels, demonstrate turning of wheels, through
o
90 and further dimensional check
(iv).
Leakage test of the conservator.
(v).
Measurement of film thickness of :

38 | P a g e
Oil insoluble varnish.
b)
c)
d)
e)
f)

Zinc chromate paint.

Finished coat.
(vi).
Tank pressure test
(vii).
Vacuum test
Core
(i).
Sample testing of core materials for checking specific loss properties,
magnetization characteristics and thickness.
(ii).
Check on the quality of varnish if used on the stampings.
(iii).
Check on the amount of burrs.
(iv).
Visual and dimensional check during assembly stage.
(v).
Check on completed core for measurement of iron loss.
(vi).
Visual and dimensional checks for straightness and roundness of core, thickness of
limbs and suitability of clamps.
(vii).
High voltage test (2 kV for one minute) between core and clamps.
Insulating Material
(i).
Sample check for physical properties of materials.
(ii).
Check for dielectric strength
(iii).
Check for the reaction of hot oil on insulating materials.
Winding
(i).
Sample check on winding conductor for mechanical and electrical conductivity.
(ii).
Visual and dimensional checks on conductor for scratches, dent mark etc.
(iii).
Sample check on insulating paper for PH value, electric strength.
(iv).
Check for the bonding of the insulating paper with conductor.
(v).
Check for the reaction of hot oil and insulating paper.
(vi).
Check and ensure that physical condition of all materials taken for windings is
satisfactory and free of dust.
(vii).
Check for brazed joints wherever applicable.
(viii).
Check for absence of short circuit between parallel strands.
Checks Before Drying Process
(i).
Check condition of insulation on the conductor and between the windings.
(ii).
Check insulation distance between high voltage connections, between high voltage
connection cables and earth and other live parts.
(iii).
Check insulating distances between low voltage connections and earth and other
parts.
(iv).
Insulating test for core earthing.
Checks During Drying Process
(i). Measurement and recording of temperature and drying time during vacuum
treatment.
(ii). Check for completeness of drying.
g)
39 | P a g e
Assembled Transformer
(i). Check completed transformer against approved outline drawing, provision for all
fittings, finish level etc.
(ii). Jacking test on the assembled Transformer.
h)
Oil
All standard test in accordance with IS: 335 shall be carried out on Transformer oil sample
before filling in the transformer.
i)
Test Reports for bought out items
The contractor shall submit the test reports for all bought out/sub contracted items for
approval. All auxiliary equipment shall be tested as per the relevant IS & IEC. Test
certificates shall be submitted for bought out items.
(i).
(ii).
(iii).
(iv).
(v).
(vi).
(vii).
(viii).
(ix).
(x).
(B) Final Inspection:
Bucholz relay
Winding temperature indicators.
Oil temperature indicators.
Bushings
Marshalling box
Air Cell
Thermo siphon filter
Pressure relief device
Off Load Tap changer
Any other item required to complete the works.
During final inspection all routine tests mentioned in clause 44.2 shall be carried
out at the factory of the manufacturer in presence of the Inspecting officer of
APDCL
Temperature rise test: temperature rise test in any one of the transformer of each lot is to be
performed in presence of the Inspecting officer of APDCL.
NB. During test if the losses exceed the guaranteed losses than the whole lot offered for inspection
will be rejected outright.
46.0 Porcelain, bushings, control devices, insulating oil and other associated equipment shall be tested by
the contractor in accordance with relevant IS. If such equipment are purchased by the contractor on a
sub-contract, he shall have them tested to comply with these requirements
46.1.
46.2.
46.3.
46.4.
40 | P a g e
Inspection and testing as already mentioned the equipment shall be subjected to routine
and other acceptance tests as per provisions in the relevant I.S.
The APDCL reserves the right to send its Engineers if so desires to witness manufacturing
process and to reject either raw materials or finished products found to be not complying
with the requirement of the specification and also shall have the right to select any/all
equipment from the lot offered for tests.
The manufacturer shall give at least (21) twenty one days’ advance notice regarding
readiness of such inspection and testing and shall submit six sets of the works test
certificates of the materials/equipment offered for inspection and testing indicating
probable date of inspection and testing.
The manufacturer shall arrange all possible facilities for such inspection and testing at any
time during the course of manufacture free of cost.
47.0
TEST CERTIFICATE
Five copies of the approved Test Certificates as mentioned above are to be furnished to
the APDCL before dispatch of the equipment.
48.0 DRAWINGS AND MANUALS TO BE SUBMITTED BY SUCCESSFUL BIDDER
48.1.
The bidder shall furnish, within fifteen days after issuing of letters Award, six copies each
of the following drawings/documents incorporating name of project and transformer rating
for approval.
i. Detailed overall general arrangement drawing showing front and side elevations and
plan of the transformer and all accessories including radiators and external features with
details of dimension, spacing of wheels in either direction of motion, net weights and
shipping weights, crane lift for untanking, size of lugs and eyes, bushing lifting
dimensions, clearances between HV and LV terminals and ground, quantity of insulating
oil etc.
ii. Foundation plan showing loading on each wheel and jacking points with respect to
centre line of transformer.
iii. GA drawing/details of bushing and terminal connectors.
iv.
Name plate drawing with terminal marking and connection diagrams.
v.
Wheel locking arrangement drawing.
vi.
Transportation dimension drawings.
vii.
Interconnection diagrams.
viii. Over fluxing withstand time characteristics of transformer.
ix.
GA drawing of marshalling box.
x.
Control scheme/wiring diagram of marshalling box.
xi.
Technical leaflets of major components and fittings.
xii.
As built drawing of schematic, wiring diagrams etc.
xiii.
Setting of oil temperature indicator, winding temperature indicator.
xiv.
Completed technical data sheets.
xv.
HV/LV conductor bushing.
xvi.
Bushing assembly.
xvii.
Bi-metallic connector for connection to “Wolf”/PANTHER ACSR/AAAC conductor
xviii.
Radiator type assembly.
48.2.
All drawings/documents, technical data sheets and test certificates/results/calculations
shall be furnished.
48.3.
Any approval given to the detailed drawings by the purchaser shall not relieve the
contractor of the responsibility for correctness of the drawing and in the manufacture
of the equipment. The approval given by the purchaser shall be general with overall
responsibility with contractor.
48.4.
Installation, operation and maintenance manual of transformer, associated equipment
like buchholtz Relay, temperature indicators, oil level indicator etc. The manual shall
41 | P a g e
clearly indicate the installation method, check-ups and tests to be carried out before
and after commissioning of the transformer.
49.0
48.5.
One copy of manual, set of approved drawings shall be submitted to the CGM
(PP&D)/APDCL before dispatch of the Transformer.
48.6.
In addition one set of approved drawing, manual for transformer shall be sent to the
respective consignee officer in water proof folder at the time of delivery of the
transformer.
GUARANTEED TECHNICAL PARTICULARS
Bidder shall furnish guaranteed technical particulars of equipment offered as per Schedule ‘B’ to be
provided along with final NIT specification),
50.0
ACCESSORIES
All accessories as specified in the schedule A are to be provided. Any other part necessary for
smooth operation of the transformer if omitted it is the manufacturer’s responsibility to include the
same.
51.0
SPARE PARTS:
The bidder is to quote for each item of recommended spare parts for each transformer as per price
bidding schedule. However quantity of spares shall be procured as per actual requirement.
42 | P a g e
SCHEDULE – A
FITTINGS & ACCESSORIES
The following fittings and accessories shall be supplied with each Transformer:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
43 | P a g e
Outdoor type bushing – HV-3 Nos. and LV-4 Nos.
Conservator with aircell and supporting bracket or structure as the case may be.
Isolating valve for conservator in between conservator and Buchholtz Relay and in between
Buchholtz relay and main tank.
Conservator valves for driving out air between air cell & wall of conservator & connection to
breather.
Conservator drain valve.
Magnetic type oil gauge with low oil level alarm contracts
Silica gel breather with oil seal and connecting pipe. The breather shall be accessible for
inspection from ground.
Spring loaded setting type Pressure relief Valve having suitable opening Port. Hole &
provision of visual indication for opening of the valve & Alarm/Trip contact arrangement.
Access/inspection holes with bolted cover for access to inner ends of bushing.
Cover lifting eyes.
Lifting eyes for core frame with windings.
Tap changing arrangement with hand wheel for Off-Load tapAir release plugs on top of cover and pressure equalizer pipe for bushing turret.
Upper filter valve and bottom filter valve.
Drain valve.
Top and bottom oil sampling devices. Provision for oil sample collection during process of
filtration should be made.
Lifting lugs.
Jacking pads with handling holes at four corners.
Transport lugs.
Under carriage base channel.
Tank earthing terminals – 2 Nos.
Buchholtz relay double float type with one set of alarm contacts, one set of trip contacts
and testing pet cock. The contacts should be wired with a PVC armoured cable
Dial thermometer for winding temperature with alarm contacts and Trip contacts.
Dial thermometer for oil temperature with alarm contacts and Trip Contacts.
An additional pocket for inserting thermometer for oil temperature indication.
Thermo siphon filter
Weather proof control cabinet for marshalling terminal connections from protective and
indicative devices. The cabinet shall be provided with incandescent filament lighting, heater
and plugs etc.
Rating plate, as per I.S.S
Diagram Plate :
Property label
SCHEDULE – B
MANDATORY SPARE PARTS:
The mandatory spare parts shall include the following against each transformer.
(i)
44 | P a g e
Bushings:
a.
High Voltage
- 1 No.
b.
Low Voltage
- 1 No.
c.
Neutral Bushing
- 1 No.
(ii)
Complete set of gaskets for all
openings on the tank requiring gasket.
- 1 Set
(iii)
Magnetic oil level gauge with low oil
level alarm contacts.
- 1 No.
(iv)
Oil temperature indicator with alarm
and trip contacts and maximum reading pointer.
- 1 No.
(v)
Winding temperature indicator with alarm and trip
contacts and maximum reading pointer
- 1 No.
(vi)
Set of all types of valves comprising one in each type.
- 1 Set
(vii)
Silicagel breather
- 1 No.
(viii)
Buchholz Relay
- 1 No.
(ix)
Air cell/Flexi separator
- 1 No.
(x)
Pressure relief device
- 1 No.
(xi)
Thermo siphon filter
- 1 No.
Guaranteed Technical Particulars
GUARANTEED TECHNICAL PARTICULARS OF 33kV /11kV TRANSFORMER
(To be filled by bidder for 5 MVA & 10 MVA separately)
Sl.
No
1
2
3
4
5
6
7
8
9
10
Description
Name of the Manufacturer
Installation [indoor/outdoor]
Reference standards
Continuous Ratings
a)
Type of cooling
b)
Rating [MVA]
c
Rated voltage
i
HV [KV rms.]
ii
LV [KV-rms.]
d
Highest system voltage
i
HV [KV rms.]
ii
LV [KV-rms.]
e
Rated frequency with ±% variation
f
Number of phases
g
Current at rated full load and on
principal tap
i
HV [Amps]
LV [Amps]
ii
Connections
HV
LV
Connection symbol and vector group
Temperature rise
a
Temperature rise of oil above reference
peak ambient temperature i.e.50 °C [by
thermometer] [°C]
b
Temperature rise of winding above
reference peak ambient temperature
[by resistance method][°C]
c
Temperature gradients between
windings & oil.
d
Limit of Hot spot temperature for which
the Transformer is designed [°C]
Type of OFF load tap changing switch
Tapping on windings for
i
Constant flux/variable flux/combined
regulation
ii
Tapping provided at
iii
Number of steps
iv
Range of tapping for variation [+ percent
to - percent]
i
No load loss at rated voltage and
frequency at principal tap [KW]
45 | P a g e
ii
11
12
13
14
15
16
17
No
load
loss
at
the
voltage
corresponding to highest tap [KW]
Load loss at rated output, rated frequency,
corrected for 75 °C winding temperature at:[Copper loss ]
i
Principal tap [In KW]
ii
Highest tap [In KW]
iii
Lowest tap [In KW]
Positive sequence impedance on rated MVA
base at rated current and frequency at
75°Centigrade winding temperature at
i
Principal tap [%]
ii
Highest tap [%]
iii
Lowest tap [%]
Zero sequence impedance at reference
temperature of 75°C at principal tap [%]
% reactance at rated MVA base at rated
current and rated frequency at
i
Principal tap [%]
ii
Highest tap [%]
iii
Lowest tap [%]
% resistance at rated MVA base at rated
current and rated frequency at
i
Principal tap [%]
ii
Highest tap [%]
iii
Lowest tap [%]
% Impedance at rated MVA base at rated
current and rated frequency at
i
Principal tap [%]
ii
Highest tap [%]
iii
Lowest tap [%]
a
Polarization index i.e. ratio of Megger
values at 600 secs to 60 secs, (H.V. to
E, L.V. to E, & H.V.to L.V.)
In Between
H.V – E
L.V. – E
H.V – L.V.
PI
Unity power
Factor
0.8 Power
factor
b
18
19
20
Regulation at full load and 75°C winding
temperature expressed as a percentage
of normal voltage
i
At unity power factor [%]
ii
At 0.8 power factor [lagging][%]
Efficiency at 75°C winding temperature as
derived from guaranteed loss figures and at
a
At full load [%]
b
At ¾ load [%]
c
At ½ load [%]
i
Maximum efficiency [%]
ii
Load at which maximum efficiency
occurs[% of full load]
Short time thermal rating of
i
HV winding in KA and duration in
seconds
ONAN
46 | P a g e
ii
21
22
23
24
25
26
27
28
LV winding in KA and duration in
seconds
Permissible over loading:a
HV winding
b
LV winding
Terminal arrangement
a
High voltage [HV]
b
Low voltage (LV)
c
Neutral
Insulating and cooling medium
Test voltage
i
Lightning impulse withstand test voltage
[KVP]
ii
Power frequency withstand test voltage
[dry and wet][for 1 minute] [KV-rms.]
Noise level when energized at normal voltage,
frequency without load.
External short circuit withstand capacity [MVA]
and duration [seconds]
Over-fluxing withstand capability of the
Transformer
DETAILS OF CORE
a
Type of core construction
b
Type of corner joints of the core
c
Maximum flux density at
i
Rated voltage [33/11 KV] & rated
frequency 50 Hz][in Tesla]
ii
Highest system voltage [36/12 KV] and
lowest system frequency [48.5Hz.][in
Tesla]
d
No load current, no load loss and no
load power factor at normal ratio and
frequency [Amp/KW/p.f.]
i
10 percent of rated voltage
ii
25 percent of rated voltage
iii
50 percent of rated voltage
iv
85 percent of rated voltage
v
100 percent of rated voltage
vi
105 percent of rated voltage
vii
110 percent of rated voltage
viii
112.5 percent of rated voltage
ix
115 percent of rated voltage
x
120 percent of rated voltage
xi
121 percent of rated voltage
xii
125 percent of rated voltage
e
Core laminations:i
Material of core lamination [M4 /HIB]
ii
Grade of core laminations
iii
Thickness of core lamination [mm]
iv
Specific loss [watt/Kg.] at rated voltage
and rated frequency
47 | P a g e
HV
LV
v
29
Specific loss [watt/Kg.] at highest
system voltage and lowest system
frequency
vi
Whether specific core loss graph [flux
density vs. watt/Kg. submitted
vii
VA/Kg at rated voltage and rated
frequency
viii
VA/Kg. at highest system voltage and
lowest system frequency
ix
Whether VA/Kg. Vs. flux density graph
Submitted
x
Insulation of core laminations
f
CORE ASSEMBLY:i
Core diameter [mm]
ii
Core window height [mm]
iii
Core leg centre [mm]
iv
Gross core cross-sectional area [m²]
v
Whether details of core widths, stacks
and calculation furnished as per
enclosed annexure
vi
Distance between centers [mm]
vii
Total height of core [mm]
viii
1)
Details of core belting.
2)
Material, grade & type
3)
Width
4)
Thickness
5)
Fixing method
ix
Details of top end frame
x
Details of Bottom end frame
xi
Details of clamp plate [Material,
thickness, Insulation]
xii
Total core weight [kg]
xiii
Core loss basing on core loss graph at
operating flux density [rated voltage and
rated frequency] [kw]
xiv
Core stacking factor
xv
Net core area Sq. m.
xvi
Margin towards corner joints, cross
fluxing etc [kw]
xvii
Total core loss at rated voltage and
rated frequency [xiii+xvii] [kw]
xviii
Dielectric loss at rated voltage and rated
frequency [KW]
xix
No load loss at rated voltage and rated
frequency [xviii+xix] [KW]
g
Describe location/method of core
grounding
h
Details of oil ducts in core
i
Peak value of magnetizing Inrush
current (% of HV rated current).
DETAILS OF WINDINGS.
48 | P a g e
HV
Regulating
LV
a
b
c
i
ii
iii
d
e
f
g
h
i
i
ii
j
i
ii
iii
k
i
ii
iii
iv
v
vi
vii
l
i
ii
iii
m
i
ii
ii
n
o
p
q
r
s
t
u
v
w
49 | P a g e
Type of winding
Material of the winding conductor
Maximum current density of windings [at
rated current] and conductor area
HV
Regulating
L.V.
Whether HV windings are interleaved
Whether windings are pre-shrunk?
Whether adjustable coil clamps are
provided for H.V. and L.V. windings?
Whether steel rings are used for the
windings? If so, whether these are split?
Whether electrostatic shields are
provided to obtain uniform voltage
distribution in the windings?
Winding Insulation.
H.V. & Regulating
LV Winding
Insulating material used for
H.V.& Regulating winding
L.V Winding
Tapping connection
Insulating material used between
H.V. and L.V. winding
H.V. and Regulating winding
Core and L.V winding
L.V. Winding and core
Regulating Winding and core
H.V. winding and core
H.V. to H.V. winding [between phases]
Type of axial coil supports
H.V. winding
Regulating winding
LV winding
Type of radial coil supports
H.V. winding
Regulating winding
LV winding
Maximum allowable torque on coil
clamping HV Regulating LV bolts
Bare conductor size (mm).
Insulated conductor size (mm).
No. of conductors in parallel (Nos.).
No. of turns/phase
No. of discs/phase
No. of turns/disc
Gap between discs. (mm).
Inside diameter (mm).
Outside diameter (mm).
Conductor area
[cm²]
Type & class
Current density
[A/cm²]
Graded or
Ungraded
Axial height after shrinkage (mm).
D.C.RESISTANCE
L.V winding at 75 ° C (Ohms).
HV winding and Regulating winding at
normal tap at 75° C (Ohms).
iii
HV winding and Regulating winding at
highest tap at 75° C (Ohms).
iv
HV winding and regulating winding at
lowest tap. (Ohms).
v
Total I²R losses at 75 ° C. for normal
tap. (KW).
vi
Total I²R losses at 75 ° C. for highest
tap. (KW)
vii
Total I²R losses at 75 ° C for lowest
tap.(KW).
viii
Stray losses including eddy current
losses in winding at 75°C (KW).
a
Normal tap position
b
Highest tap position
c
Lowest tap position.
d
Any special measures taken to reduce
eddy current losses and stray losses,
mention in details
x
Load losses at 75°C [I²R + stray].
a
Normal tap position [KW].
b
Highest tap position [KW].
c
Lowest tap position [KW].
z
Details of special arrangement provided
to improve surge voltage distribution in
the windings
BUSHINGS.
a
Make and type
i
Rated voltage class [KV-rms.]
ii
Rated current [Amps.]
b
Lightning Impulse withstand test voltage
[1.2/50 micro second][KVP]
c
Power frequency withstand test voltage
i
Wet for 1 minute [KV-rms]
ii
Dry for 1 minute [KV-rms]
d
Power
frequency
visible
corona
discharge voltage [KV-rms.]
e
Minimum creepage distance in mm
f
Phase to earth clearance in air of live
parts at the top of bushings
x
y
i
ii
30
31
LV
In Oil
Minimum clearance [mm]
32
HV
HV
LV
Weight [Tolerance + 5%]
50 | P a g e
Between
Windings
Phase
to
Ground
Neutral
Out of Oil
Phase
Between
to
windings
Ground
33
34
[Approximate value is not allowed]
a
Core [Kg.]
b
Core with clamping [Kg.]
c
H.V. winding insulated conductor [Kg.]
d
Regulating winding insulated conductor
[Kg.]
e
L.V.winding insulated conductor [Kg.]
f
Coils with insulation [Kg.]
g
Core and winding [Kg]
h
Oil required for first filling [Liter/Kg.]
i
Tank and fittings with accessories [Kg.]
j
Untanking weight [Kg.]
k
Total weight with oil and fittings [kg.]
DETAILS OF TANK
a
Material for Transformer tank
b
Type of tank
c
Thickness of sheet
[No approximate value to be mentioned]
Sides [mm]
i
ii
Bottom [mm]
iii
Cover [mm]
iv
Radiators [mm]
d
Inside dimensions of main tank
[No approximation in dimensions to be
used]
i
Length [mm]
ii
Breadth [mm]
iii
Height [mm]
e
Outside dimensions of main tank
[No approximation in dimensions to be
used]
i
Length [mm]
ii
Breadth [mm]
iii
Height [mm]
f
Thickness of spray galvanisation of tank
bottom.
g
Vacuum recommended for hot oil
circulation [torr]
h
Vacuum to be maintained during oil
filling in Transformer tank [torr]
i
Vacuum to which the tank can be
subjected without distortion [torr]
j
No. of bi-directional wheels provided
k
Track gauge required for the wheels
i
Transverse axis
ii
Longitudinal axis
l
Type and make of pressure relief device
and minimum pressure at which it
operates [Kpa]
CONSERVATOR
a
Total volume [Liters]
51 | P a g e
b
35
36
Volume between the highest and lowest
visible oil levels [Litres]
c
Whether flexi separator provided
OIL QUALITY
a
Governing standard
b
Density in gms/cu-cm
c
Kinematics viscosity in CST
d
Inter facial tension at 27°C in N/m
e
Flash point in °C
f
Pour point in °C
g
Acidity [neutralization value] in mg of
KOH/gm
h
Corrosive sulfur in %
i
Electric strength [breakdown voltage]
i
As received [KV-rms.]
ii
After treatment [KV-rms.]
j
Dielectric dissipation factor [tan delta] at
90°C
k
Saponification value in mg of KOH/gm
l
Water content in ppm
m
Specific resistance
i
At 90°C [ohm-cm]
ii
At 27 °C [ohm-cm]
N- dm analysis
CA%
CM%
CP%
o
Oxidation stability
i
Neutralization value after oxidation
ii
Total sludge after oxidation
p
Characteristic of oil after ageing test as
per ASTMD-1934
i
Specific resistance at
27°C [ohm-cms]
90°C [ohm-cms]
ii
Tan delta
iii
Sludge content
iv
Neutralization number
v
Details of oil preserving equipment
offered
vi
Thermo siphon filter provided
RADIATORS
a
Overall dimensions lxbxh [mm]
b
Total weight with oil [Kg.]
c
Total weight without oil [Kg.]
d
Thickness of radiator tube [mm]
e
Types of mounting
f
Vacuum withstand capability
g
Total radiating surface in sq.m
h
Type and make of material used for the
radiators
52 | P a g e
i
37
Total number of radiators for
Transformer and dimensions of tubes
j
Thickness of hot dip galvanization of
radiators
GAS AND OIL OPERATED RELAY
a
Make
b
Type
c
Size
d
38
Whether supervisory alarm and trip
contacts provided and their sizes and
Nos
TEMPERATURE INDICATORS
a
b
39
Make and type
Permissible setting ranges for alarm and
trip
c
Number of contacts
d
Current rating of each contact
e
Whether supervisory alarm contacts
provided?
f
Size [lxbxd]
g
Nos.
h
Ratio and type of CT used for winding
temperature indicators.
APPROXIMATE OVERALL DIMENSIONS
OF TRANSFORMER INCLUDING
COOLING SYSTEM, TAP CHANGING
GEAR ETC.
Length [mm]
Breadth [mm]
Height [mm]
40
a
41
42
43
44
45
46
Minimum clearance height for lifting core
and winding from tank [mm]
b
Minimum clearance height for lifting tank
cover [mm]
SHIPPING DETAILS
a
Approximate weight of heaviest package
[Kg.]
b
Approximate dimensions of largest
Package [Kg.]
Transformers will be transported with oil/gas.
MARSHALLING KIOSK
a
Make and type
b
Details of apparatus proposed to be
housed in the kiosk
Details of anti-earthquake device provided, if
any
Separate conservator and Buchholz relay
provided
TAP CHANGING EQUIPMENT
53 | P a g e
Oil Temp
Indicator
Winding Temp
Indicator
47
48
49
50
[These details refer to the basic rating of O.L.
T.C. as guaranteed by OLTC manufacturers]
a
Make
b
Type
c
Power flow [Uni.-directional/bi directional/restricted bi-directional]
d
Rated voltage to earth [KV]
e
Rated current [Amps.]
f
Step voltage [volts]
g
Number of steps
h
Control - manual/localelectrical/remoteelectrical
i
Voltage control [Automatic/Non automatic]
j
Line drop compensation provided/not
provided
k
Parallel operation
l
Protective devices
m
Auxiliary supply details
n
Time for complete tap change [one
step][Sec.]
o
Diverter selector switch transient time
[cycles]
p
Value of maximum short circuit current
[Amps]
q
Maximum impulse withstand test voltage
with 1.2/50 micro seconds full wave
between switch
assembly and ground [KVP]
r
Maximum power frequency test voltage
between switch assembly and earth
[KV-rms]
s
Maximum impulse withstand test voltage
with 1.2/50 micro-seconds across the
tapping range [KVP]
t
Approximate overall dimensions of tap
changer [WxBxD] in mm
u
Approximate overall weight [Kg.]
v
Approximate mass of oil [Kg.]
w
Particulars of the OLTC control panel for
installation in control room
DRIVING MECHANISM BOX
a
Make and type
b
Details of apparatus proposed to be
housed in the box
Types of terminal connectors and drawing No
a
HV
b
LV
Details of painting, galvanization conforms to
this Specification [Yes/No]
Type of oil level indicator and whether
54 | P a g e
51
52
53
54
55
56
57
58
Supervisory alarm contact for low oil level
provided [Yes/No]
Type and size of thermostat to be used
No. of breathers provided [Nos.]
Type of dehydrating agent used for breathers
Valve sizes and numbers
a
Drain valves- mm-Nos
b
Filter valves- mm-Nos
c
Sampling valves- mm-Nos
d
Radiator valves- mm-Nos
e
Other valves- mm-Nos
a
Type and make of PRV
b
No. of each type of devices per
transformer
c
Min. pressure at which device operates
Please enclose the list of accessories and
fittings, being provided on transformer. Please
confirm, these are as stipulated in the tender
Whether the transformer, covered is fully type
tested and if so, whether copies of type test
certificates, enclosed with the tender
Please confirm that you will guarantee
maximum Impedance variation between phases
within the limit of 2% only
55 | P a g e
ANNEXURE-III
MAXIMUM FLUX DENSITY AND CORE WEIGHTAND NO-LOAD CALCULATION
(To be filled by bidder 5 MVA & 10 MVA separately)
Rating of Transformer
: 33/11kV, 5 MVA Power Transformer &
33/ 11 KV , 10 MVA Power Transformer
Name of the bidder: Type and Grade of Core: Thickness [in mm]:Step No Width of steps [mm]
1
2
3
4
5
6
7
8
9
10
11
12.
13 to ------
Stack thickness [mm]
Gross Iron area [mm²]
E= 4.44 x f x B max. X Ai x N
Where E = L.V. winding phase voltage / phase = 11000/1.732 volts.
f = Rated frequency = 50 HZ.
B max. = Maximum flux density in Tesla.
Ai = Net iron area in sq.m = Gross iron area x stacking factor in sq.m
N = Number of L.V.winding turns/phase
B max. = E/4.44 x f x Ai x N
Core weight calculation:Core dia [in mm] =
Window height [in mm] =
Limb center [in mm] =
Weight of core = [3 x window height + 4 x limb centre + 2 x max. width] x Net iron area x Density of
core
NO-LOAD LOSS CALCULATION: Core Weight (Kg) x (watt/kg)
NB: -
N.B.:-
1. Specific loss vs. flux density graph for the type of core lamination to be used has to be furnished.
2. VA/Kg. Vs flux density graph for the core lamination to be used has to be furnished.
3. Specific loss Watt /kg curve to be furnished & handling factor to be considered for core loss in
corner limb etc.
4. Any other factor assumed for above calculation to be explained with reasons.
The bidder may use its own method of calculation towards determination of maximum flux
density and weight of the core. But the same shall be supported with proper explanation and
justification.
Place:
Date:
56 | P a g e
Signature of Tenderer
with seal of Company.
ANNEXURE-IV
DETAILS OF WINDING RESISTANCE AND LOAD LOSS CALCULATIONS
(to be submitted by the Bidder for 5MVA & 10 MVA seperately)
Rating of Transformer
:1)33/11kV, 5 MVA,Power Transformer
2) 33/11 KV, 10 MVA Power Transformer
1.
2
3
4
5
6
7
8.
Name of the Firm
Flux density at
i
36/12 KV and 48.5 Hz [Tesla]
ii
33/11 KV & 50.0Hz [Tesla]
i
Core weight in Kg.
ii
Gross core area [mm²]
iii.
Stacking factor.
iv.
Net core iron area [mm²] [ii x iii]
[a]
Specific losses [W/Kg.]
i
At maximum flux density corresponding to
36/12 KV and 48.5 HZ.
ii
At maximum flux density corresponding to
33/11KV and 50Hz.
[b]
Volt ampere/Kg
(i)
At maximum flux density corresponding to
36/12 KV and 48.5 Hz.
(ii)
At maximum flux density corresponding to
33/11 KV and 50 Hz.
Calculated/guaranteed Core loss in KW at:i
Rated voltage and rated frequency
ii
Maximum system voltage and lowest system frequency
Current density [A/Sq. mm] for
i
HV
ii
Regulating
iii
LV
Conductor size [in mm²]
a
HV winding
i
Bare
ii
Insulated
iii
No of conductors in parallel
iv
Conductor Area
b
Regulating winding
i
Bare
ii
Insulated
iii
No of conductors in parallel
iv
Conductor area
c.
L.V. winding
i.
Bare
ii.
Insulated.
iii.
No. of conductors in parallel.
Iv
Conductor area
Copper weight
i
H.V. windings
ii
Regulating windings
iii
LV windings
iv
For Tap connections, star connection and any
57 | P a g e
9.
10.
11.
12.
13.
14.
15.
NB: -
other [please specify]
v
Total copper weight [i]+[ii]+[iii]+[iv]
L.V. winding resistance in ohms at 75°C/Phase.
H.V. winding resistance in ohms at 75°C/Phase.
a
At normal tap position
b
At maximum tap position
c
At minimum tap position
Stray losses and eddy current losses [in KW] at 75°C
a
At normal tap position
b
At maximum tap position
c
At minimum tap position
Resistively of copper to be used for winding
I²R loss at 75°C
i
At normal tap position [in KW]
ii
At maximum tap position [in KW]
iii
At minimum tap position [in KW]
Calculated guaranteed Load losses [in KW] at
75°C [I²R loss + stray losses]
i
At normal tap position
ii
At maximum tap position
iii
At minimum tap position
Computed/guaranteed total load loss in KW at rated
voltage and rated frequency
[Copper loss + Iron loss]
i
At normal tap position
ii
At maximum tap position
iii
At minimum tap position
1. Approximate values in weight and losses etc. are not allowed.
2. Tolerance of + 5% in weights may be quoted without any approximation
Place:
Date
Bidder’s name:
Signature, designation, seal
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Annexure V
DECLARATION
I………………………………………………………………………… authorized representative of M/S
……………………………………………………………………………………tenderer
against
NIT
no
…………………………………………………………..dtd …………………………issued by CGM(PP&D),
APDCL have gone through all section of the bid document of the tender and further bind myself/the said
M/S ………………………………………………………………to abide by the said terms and conditions
I also declare that the information submitted by me on behalf of the tenderer are true and correct
to the best of my knowledge and belief. It is also known to me that any deviation of facts or misleading or
false representations in the forms, statements and attachments submitted will render the bid for outright
rejection from participation in the said tender.
Signature with full name
and designation of tenderer
with seal
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SECTION – 7
FORMS OF BID
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PROFORMA OF BANK GUARANTEE FOR EARNEST MONEY
(To be stamped in accordance with Stamp Act)
The non-Judicial stamp paper should be in the name of issuing bank
Ref…………………………..
Bank Guarantee No…………..
Date…………………….
To
The Chief General Manager (PP&D)
Assam Power Distribution Company Ltd.
Bijulee Bhawan, Paltanbazar
Guwahati-1
Dear Sirs/ Madam,
In accordance with invitation to bid under your Bid No………………. M/s………………. having
its Registered/ Head Office at ……………..( hereinafter called the ‘Bidder’) wish to participate in the
said Bid or ………………… and you, as a special favour have agreed to accept an irrevocable and
unconditional Bank Guarantee for an amount of ……………….. valid upto……………………. On behalf
of Bidder in lieu of the Earnest Money deposit of the BID required to be made by the bidder, as a
condition precedent for participation in the said Bid.
We, the …………………. Bank at …………………… have our Head Office at…………..( local address)
guarantee and undertake to pay immediately on demand by Assam Power Distribution Company
Limited, the Amount of ……………………………………………
…………………………………………………..( in words & figures) without any reservation, protest,
demur and recourse. Any such demand made by said ‘Owner’ shall be conclusive and
binding on us irrespective of any dispute or difference raised by the Bidder.
The Guarantee shall be irrevocable and shall remain valid up to and including ………….
@....................... if any further extension of this guarantee is required, the same shall be extended
to such required period ( not exceeding one year) on receiving instruction from M/s ………… … ……….
on whose behalf this guarantee is issued.
In witness whereof the Bank, through its authorized office, has set its hand and stamp on this
…………… day of ………………….. 20………… at …………………………
WITNESS
………………………
(Signature)
……………………..
(Name)
…………………….
( Official Address)
…………………….
( Signature)
……………………
(Name)
……………………
(Official Address)
@ This date shall be thirty (30) days after the last date for which the bid is valid.
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PROFORMA OF BANK GUARANTEE FOR CONTRACT PERFORMANCE
(To be stamped in accordance with Stamp Act)
Ref…………………………..
Bank Guarantee No…………..
Date…………………….
To
The Chief General Manager (PP&D)
Assam Power Distribution Company Ltd.
Bijulee Bhawan, Paltanbazar
Guwahati-1
Dear Sirs/ Madam,
In consideration of Assam Power Distribution Company Ltd., (herein after referred to as the
‘Owner’ which expression shall unless repugnant to the context or meaning thereof include its
successors,
administrators
and
assigns)
having
awarded
to
M/s……………
….……………………….with registered/ Head office at ……………….( hereinafter referred to as “
Contractor” which expression shall unless repugnant to the context or meaning thereof include its
successors, administrators, executors and assigns), a Contract by issue of Owner’s Letter of Intent
No…………… dated……………….. and the same having been acknowledged by the contractor,
resulting in a contract and contractor having agreed to provide a Contract Performance Guarantee for
the faithful performance of the entire Contract equivalent to 10(%) of the said value Contract to the
Owner.
We………………………………………………………………………………………….. (Name & Address)
having its Head Office at …………………( hereinafter referred to as the “ Bank” , which expression
shall, unless repugnant to the context or meaning thereof, include its successors, administrators,
executors and assigns) do hereby guarantee and undertake to pay the owner, on demand any or all
monies payable by the contractor to be extent of ₹ …………………. at any time up to
………………………..**( day/month/year) without any demur, reservation , contest , recourse or protest
and / or without any reference to this contractor. Any such demand made by the owner on the bank
shall be conclusive and binding notwithstanding any difference between the Owner the Contractor or
any dispute pending before any Court, Tribunal, Arbitrator or any other authority. The bank undertakes
not to revoke this guarantee during its currency without previous consent of the owner and further
agrees that the guarantee herein contained shall continue to be enforceable till the owner discharges
this guarantee.
The Owner shall have the fullest liberty without affecting in any way the liability of the Bank under the
guarantee, from time to time to extend the time for performance or the contract by the contractor. The
owner shall have the fullest liberty, without affecting this guarantee, to postpone from time to time the
exercise of any power vested in them or of any right which they might have against the contractor, and
to exercise the same at any time in any matter, and either to enforce or to for bear to enforce any
covenants, contained or implied, in the contract between the owner and the contractor or any other
course or remedy or security available to the owner. The Bank shall not be released to its obligations
under these presents by any exercise by the owner of its liberty with reference to the matters aforesaid
or any of them or by reason of any other act of omission or commission on the part of the owner or any
other indulgences shown by the owner or by any other matter or thing whatsoever which under law
would, but for this provision have the effect of relieving the Bank.
The bank also agrees that the owner at its option shall be entitled to enforce this guarantee against the
Bank as a principal debtor, in the first instance without proceeding against the contractor and not
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withstanding any security or other guarantee the owner may have in relation to the Contractor’s
liabilities.
Notwithstanding anything contained herein above our liability under this guarantee is restricted to
……………………. And it shall remain in force up to an including …………………….. and shall be
extended from time to time for such period( not exceeding 1 year) as may be desired by
M/s………………………………………………………….on whose behalf this guarantee has been given.
Dated this……………………. Day of ……………………….. 20……………… at…………
WITNESS
…………………………….
(Signature)
………………………
(Signature)
……………………………
(Name)
……………………..
(Name)
…………………………..
(Official address)
……………………..
(Official address)
Attorney as per power
Of Attorney No…………..
Date……………………..
NB: The stamp paper of appropriate value shall be purchased in the name of issuing bank.
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PROFORMA OF EXTENSION OF BANK GUARANTEE
Ref…………………………..
Date…………………….
To
The Chief General Manager (PP&D)
Assam Power Distribution Company Ltd.
Bijulee Bhawan, Paltanbazar
Guwahati-1
Dear Sirs/ Madam,
Sub:
Extension of Bank Guarantee No……………….. for Rs…………………. Favouring yourselves ,
expiring on …………………. On account of M/S………………………….. in respect of contract
no……………………. dated …………….. ( hereinafter called original Bank Guarantee).
At the request of M/s ……………………… we …………………… bank, branch office at
………………….. and having its Head Office at ………………………. Do hereby extend our liability
under the above mentioned Bank Guarantee No………………… dated………………………for a further
period of ……………………… ( Years/ Months) from………………….. to expire on…………………..
expect as provided above, all other terms and conditions of the original Bank Guarantee
No………………………. dated ………………. Shall remain unaltered and binding.
Please treat this as an integral part of the original Bank Guarantee to which it would be attached.
Yours faithfully
For………………………………
Manager/ Agent/Accountant …………………..
Power of attorney No……………………
Dated……………………………………
SEAL OF BANK
Note: The non-judicial stamp paper of appropriate value shall be purchased in the name of the Bank
who has issued the Bank Guarantee.
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