ESIC HOSPITAL AT FARIDABAD
66 /11KV GIS SUBSTATION
FOR 2X 8/8MVA FOUR BAY GIS SUBSTATION
TECHNICAL SPECIFICATIONS
&
SCHEDULES
66/11KV GIS SUBSTATION
TECHNICAL SPECIFICATION
INDEX
CLAUSE NO.
TITLE
PAGE NO.
1.0
GENERAL
1
2.0
POWER SYSTEM DESCRIPTION
2
3.0
SCOPE OF WORKS
4.0
WORK NOT INCLUDED
5
5.0
STANDARD AND REGULATIONS
6
6.0
DESIGN REQUIREMENTS
7
7.0
EQUIPMENT SPECIFICATION
8 - 82
8.0
DRAWINGS, DATA AND MANUALS
83 - 85
9.0
INSPECTION AND TESTING
86 - 87
10.0
MATERIALS AND SUBSTITUTION
11.0
LIST OF MAKES
3-4
88
89 – 90
SCHEDULES
91
SCHEDULE – TABLE CONTENTS
92
SCHEDULE – 1 TO 10
93 to 127
-
ESIC Hospital Faridabad
1.0
Technical Specification
66/11KV GIS Substation
GENERAL
1.1
The equipment specified herein shall be designed, manufactured, assembled,
supplied, for the ESIC Hospital at Faridabad.
1.2
The equipment covered by this specification, prepared by Design
associates noida are subject to the latest codes and standards referred to,
along with the specification. The supplier shall be responsible for and
governed by all requirements of this specification.
1.3
All designs, drawings, specifications and other technical data shall be based on the
metric system of measurement.
1.4
Where, in specific, no codes, standards exist for a particular feature, established
industry norms shall be adopted as per accepted practice.
1.5
Each vendor has to study space requirement, workout his own design for
66KV GIS along with all other equipments and he has to submit this along
with the bid particularly all layout drawings in autocad giving dimensions
of all 66KV equipments, transformer, 11kV system, soak pit space,
lightning arrestor and state metering provisions etc. in detail. It is
mandatory to submit all 66KV equipment details & layout prior to any
commercial offer.
1.6
Each vendor has to submit detailed technical data sheet with proposed layouts
first before submitting commercial offer.
1
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ESIC Hospital Faridabad
2.0
Technical Specification
66/11KV GIS Substation
POWER SYSTEM DESCRIPTION
To meet the specific requirements of the project the Power Distribution System
has been planned in the following manner:
2.1
Power for running the ESIC Hospital at Faridabad shall normally be
obtained from the M a i n S u b s t a t i o n , a t 6 6 k V, 3 P h , 5 0 H z . T h e
s ys t e m particulars at the receiving side are as follows:
Voltage
:
66 kV, + 10%
•
Phase
:
3 PH
•
Frequency
:
50 Hz, + 3%
•
Fault level
:
3500 MVA
•
System Earthing
•
-
66 KV
:
Solidly Earthed
-
11 KV
:
Resistant Earthed
2.2
There will be one independent feeder from Haryana supply authorities capable of
taking total ESIC Hospital load of approx. 12MW individually.
2.3
Power from Haryana state through 4 Nos. single core 66KV grade cables
upto one No. 66 KV Switchgear inside HT switchgear near metering will be
provided.
2.4
From HT switchgear near metering, one set of outgoing cables is going to 66 KV
incoming indoor GIS switchgears proposed for locating it inside Sub-station
building. 2 Nos. 66KV GIS (1 incoming, 1 no. bus coupler and 2 outgoing) will be
installed now.
2.5
At Sub-stations voltage will be further stepped down to 11KV through 2X8/8 MVA
power transformer
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Technical Specification
66/11KV GIS Substation
3.0
SCOPE OF WORK
3.1
The Specification outlines the conditions and functional requirements for the design
manufacture, testing at manufacturer’s works, packing, delivery including
unloading as directed at site and handing over of H.T. complete 66KV
double bus GIS substation and Controls as detailed herein including furnishing
of all labour, material and services required. Along with the technical bid the
tenderer has to submit detailed 66KV layouts and space available is shown in
attached layouts. Along with technical bid each vendor has to submit detailed
filled technical data sheets enclosed in Schedule section.
3.2
The Specification outlines the functions and the operating characteristics
which the H.T. 66KV double bus GIS substation and Controls must fulfill.
Alternative features other than specified may be acceptable subject to the
approval of the Engineer / consultant. However, the main offer must be in line
with the specification.
3.3
The performance of the H.T. 66KV double bus GIS substation and
Controls delivered shall be guaranteed in every detail by the successful
tenderer. Functional requirement as specified herein shall be strictly adhered.
Along with tender detailed layouts has to be submitted marking all equipments
with appropriate clearances.
3.4
Not wi thstanding the details furnished in this document, it shall be the
responsibility of the supplier to complete the work in all respects (with the
exception of those items enlisted under Sec. 4.0 "Work Not Included") supply
the complete satisfaction of the Engineer.
3.5
The supplier has to provide the detailed layout, proposing building size,
wiring diagram, installation and commissioning manuals of the interface of
sub – system to be supplied under the scope of this contract along with the
tender document and has to train m/s ESIC Hospital staff at site for min. 7 days.
3.6
The scope of works shall comprise the items listed below:
- Design of complete 66KV double bus GIS substation along with 66KV metering
provision , 66KV cables, 66KV indoor GIS along with isolator, CT & PT, 66KV LA,
66/11 KV power transformer, NGR, design of entire earthing grid after taking earth
resistivity figures and submit detailed calculation of touch potential and step potential
during detailed engineering, 11KV cables, 11KV switchgear, complete protection of
66KV and 11KV system, relay settings and discrimination curves with graph, internal
& external illumination of Switchyard, battery and battery charger.
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ESIC Hospital Faridabad
Technical Specification
66/11KV GIS Substation
3.7
Scope of Work shall also include
3.7.1
Supply of recommended spares as required for five years of operation
3.7.2
Submission of maintenance and operating manuals.
3.7.3
Suppl y of design data, calculation sheets and equipment drawings as
specified in this document.
3.7.4
Submission of detailed as built drawings.
3.7.5
Co-ordinating the exchange of engineering
information
with the other
Contractors / suppliers working
in
that area,
furnishing
required
drawing / information for approval from the statutory authorities.
3.7.6
Supply of detailed technical literature/data sheet of switchgear, circuit breaker
and other component, characteristics curve and relay setting/selection chart.
3.7.7
List of bought out items and vendors.
3.7.8
Drawings and load data for foundation/civil work.
3.8
The bidder shall be responsible for manufacture, scheduling, connection, testing &
delivering the supply within 4 weeks from date of receipt of LOI.
3.9
The bidder offer commissioning shall impart training to plant technicians, operators
& supervisory personnel.
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4.0
Technical Specification
66/11KV GIS Substation
WORK NOT INCLUDED
There is no work exclusion and entire work of 66 KV switchyard alongwith
attached civil works shall be part of this work.
.
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Technical Specification
66/11KV GIS Substation
5.0
STANDARDS AND REGULATIONS
5.1
The design, manufacture of 66/1KV GIS substation shall conform as a
minimum to applicable codes, rules, regulations and standards published by the
following bodies:
BIS
: Bureau of Indian Standard
IER
: Indian Electricity Rules
IEC
: International Electro-Technical Commission
IEEE
: Institute of Electrical & Electronics Engineers
NEMA
: National Electrical Manufacturer's Association
NFPA
: National Fire Protection Association
BSI
: British Standard Institution
ISO
: International Organisation for Standardisation
In addition to the above, H.T. Switchgears shall also conform to regulation and
statutory acts and rules of Government of India and State Government of
Haryana.
5.2
Applicable Codes & Standards
Unless otherwise specified, the complete GIS and substation equipment shall
conform to latest amended Indian Standards:
5.3
In case of conflict between the above standard and this specification the
requirement of this specification shall prevail.
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Technical Specification
66/11KV GIS Substation
6.0
DESIGN REQUIREMENTS
6.1
The design of the 66/11KV double bus indoor GIS substation shall be in
accordance with the requirements of these specifications and the best current
engineering practice, together with the following general requirements:
A. The essence of design shall be safety, simplicity and reliability in order to
give long continuous service with good economy and low maintenance cost.
Particular attention shall be paid to internal and external access to the
equipment in order to facilitate inspection, cleaning, and maintenance.
B. The design shall comply with relevant codes and regulations applicable
C. 66/11KV substation shall be designed to minimize the risk of fire and any
damage which may be caused in the event of fire. For this the successful
vendor has to submit detailed earthing calculation of step potential calculation
and touch potential calculation along with earth resistivity value. The bidder
shall undertake test on his own for determination of earth resistivity for
calculating earth grid values and potentials.
D. 66/11KV substations protection system shall be so designed that they provide
satisfactory service and without any harmful effects for prolonged and
continuous periods. The vendor shall submit detailed coordinated relay settings
along with discrimination curves on graph for 66KV and 11KV side.
E. The Supplier shall apply suitable derating factors based on the most severe
conditions encountered in the site, by reducing the permissible temperature
rise above the reference ambient temperature.
F.
The reference design ambient temperature for electrical equipment shall be
50 deg. C and relative humidity 90%.
G. All equipment shall be provided with nameplate of approved Design.
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Technical Specification
66/11KV GIS Substation
7.0
TECHNICAL SPECIFICATION FOR 66 /11 KV SWITCHYARD
7.1
SPECS FOR 66KV CROSS LINKED POLYETHYLENE INSULATED POWER
CABLE:
7.1.1
SCOPE
The scope under this section covers design, manufacture, testing, packing, supply,
delivery and laying of 66 KV, XLPE, insulated power cable for use with effectively
earthed distribution systems.
7.1.2
STANDARDS
Unless otherwise specified, the cables shall conform, in all respects to IS:7098(Part-III
/93 & test to IEC 60840 with latest amendment or latest edition for cross linked
polyethylene insulated PVC sheathed cable for working voltage of 66 KV.
7.1.3
CLIMATIC CONDITION
The climatic conditions under which the cable shall operate satisfactory are as follows:
a)
Location
: IN THE STATE OF HARAYANA
b)
Maximum ambient temperature of air in shade
: 0C
:
50
c)
Minimum ambient temperature of air in shade
: 0C
:
-2.5
d)
Maximum daily average ambient temperature
: 0C
:
42
e)
Maximum yearly average ambient temperature
: 0C
:
32
f)
Maximum relative humidity
:%
:
100
g)
Minimum relative humidity
:%
:
26
h)
Average number of thunder storm days per annum :
i)
Average annual rain fall
: mm
:
900
j)
Max wind pressure
: kg/m2 :
195
k)
Attitudes not exceeding above MSL
: Meter :
1000
l)
Max soil temp. at cable depth
:0C
30
m)
Isocreanic level days / year
:
n)
Seismic level (horizontal acceleration)
35
:
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7.1.4
Technical Specification
66/11KV GIS Substation
PRINCIPAL PARAMETERS:
7.1.4a 66 KV (E) grade XLPE single core power cable of single length, with H2 /H4grade
aluminum conductor, compact stranded circular class 2 shape confirming to IEC 60228
(class 2) IS:8130/84, shielded with extruded semi-conducting layer, insulated with dry
gas cured cross linked polyethylene (XLPE) insulation, insulation screened with
extruded semi-conducting layer, screened lapped with a combination of semi
conducting water swell able and corrugated aluminium followed by black extruded PE
or bitumen layer inner sheath, graphite coating PVC or black HDPE outer sheathed
overall cable confirming to IS: 7098 (Part-III)/1993 & test to IEC 60840 or any latest
amendments thereof.
7.1.4b Outer sheathing should be designed to afford high degree of mechanical protection
and should also be heat, oil chemicals and weather resistant. Common acid, Alkalis
and saline solution should not have adverse effect on the PVC sheathing material
used. Extruded PVC compound type ST2 confirming to IS: 7098 (Part-III)/1993 & test
to IEC 60840 or any latest amendments thereof.
7.1.4c The cable should be suitable for laying in covered trenches and/or under ground for
outdoor.
7.1.4d CABLE PARAMETERS
66 KV
i)
Voltage Grade (Uo/U)
38/66 (72.5 KV)
ii)
No. of cores
single
iii)
Size (mm2)
400mm2
iv)
Nominal system voltage KV
66
v)
Highest system voltage KV
72.5
vi)
System Frequency Hz
50
vii)
Variation in frequency
+ 3%
viii)
Fault level individually for
ix)
i) Conductor
As per rating
ii) Cu. Screen /Alm armour
31 KA for 1 sec.
Maximum allowable temperature
a)
Design continuous operation
at rates full load current, the
0C
90
0C
250
max, temp. of conductor shall
not exceed.
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ESIC Hospital Faridabad
x)
Technical Specification
66/11KV GIS Substation
Basic insulation level
325 KVP
(1.2/50 Micro Second Wave)
xi)
xii)
7.1.5
1 min power frequency withstand
voltage (rms)
140 KV
System earthing
Effectively earthed
GENERAL TECHNICAL REQUIREMENTS
7.1.5a CONDUCTOR: The cable conductor shall be made from stranded H2/H4grade
aluminium to form compact circular shaped conductor having resistance within limits
specified in IS: 8130/1984, IEC 60228 (class 2) and any amendment thereof. The
conductor shall confirm to IEC 228 and the shape shall be compacted circular shaped.
7.1.5b CONDUCTOR SHIELD: The conductor having a semi conducting screen shall ensure
perfectly smooth profile and avoid stress concentration. The conductor screen shall be
extruded in the same operation as the insulation, the semi – conducting polymer shall
be cross-linked.
7.1.5c INSULATION: The XLPE insulation should be suitable for specified 66 system voltage.
The manufacturing process shall ensure that insulation shall be free from voids. The
insulation shall withstand mechanical and thermal stressed under steady state and
transient operating conditions. The extrusion method should give very smooth interface
between semi-conducting screen and insulation. The insulation of the cable shall be of
high standard quality, generally confirming to IEC -502 and IS 7089 Part –II/1988
(latest edition).
7.1.5d INSULATION SHIELD: To confine electrical field to the insulation, non – magnetic
semi-conducting shield shall be put over the insulation. The insulation shield shall be
extruded in the same operation as the conductor shield and the insulation by suitable
extrusion process. The XLPE insulation shield should be bonded type.
7.1.5e INNER SHEATH: The inner sheath shall comprises of a combination of semiconducting water swell able and poly aluminium laminated tape. The sheath shall be
suitable to withstand the site conditions and the desired temperature. It should be of
adequate thickness, consistent quality and free from all defects. The sheath shall be
extruded and of black P.E.(Poly-ethylene) ST2 confirming to IS:7098(Part-III)/93.
7.1.5f ARMOUR: Single H2 aluminium wire armouring shall be provided.
7.1.5g OUTER SHEATH: Suitable semi conducting layer coated on extruded HDPE outer
sheath confirming to IEC: 502/1983 and IS:7098(Part-III)/93 , shall be applied over
armouring with suitable additives to prevent attach by rodents and termites.
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Technical Specification
66/11KV GIS Substation
7.1.5h CONSTRUCTION:
All materials used in the manufacture of cable shall be new unused and of finest
quality. All materials should comply with the applicable provision of the tests of the
specification, IS, IEC, Indian Electricity Act and any other applicable statutory
provisions rules and regulations.
7.1.5i CURRENT RATING: The cable will have current ratings and derating factors as per
relevant standard IEC.
7.1.5j The one – second short circuit rating values each for screen /armour shall be furnished
and shall be subject to the purchaser’s approval.
7.1.5k The current ratings shall be based on maximum conductor temperature of 90 deg. C
with ambient site condition specified for continuation operation at the rated current.
7.1.5l SIZE:
The different sizes of cable shall be 66 KV single core
a) 400 mm2
7.1.5m
OPERATION:
-
Cables shall be capable of satisfactory operation under a power supply system
frequency variation of plus minus 3% voltage variation of plus, minus 10% and
combined frequency voltage variation of 10% (absolute sum).
-
Cable shall be suitable for laying in ducts or buried under ground.
-
Cable shall have heat and moisture resistance properties. These shall be of
type and design with proven record on transmission network service.
7.1.5n LENGHTS: The cable shall be supplied in standard drum lengths as below:
Size of cable
Standard Drum Length
a) 66 1c x 400mm2,
750 meters + 5% tolerance and + 2%
overall tolerance in total quantity of cable.
7.1.5o INDENTIFICATION MARKING: Identification of cables shall be provided externally at
three meters intervals to identify as under:
i.
‘Name of Manufacture’
ii.
‘Year of manufacture’
iii.
‘Voltage grade’ to be printed/ embossed at the interval of one meter-length. The
identification, by printing or embossing shall be done only on the outer sheath.
Name of purchaser shall also be embossed.
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7.1.6
Technical Specification
66/11KV GIS Substation
TESTS
7.1.6a Type Tests
The equipment offered should be type tested. Type test report should not be more than
five years old, reckoned from the date of bid opening, in respect of the following tests,
carried out in accordance with ISS-7098/IEC-871, from Govt. / Govt. approved test
house shall be submitted along with bid.
i)
Physical tests for insulation and outer sheath
ii)
Bending test.
iii)
Di-electrical power factor test.
iv)
Heating cycle test followed by di-electrical power factor as a function of voltage
and partial discharge test.
v)
Impulse withstand test.
The remaining type test report as per clause 3 of ISS-7098/IEC-871 shall be submitted
by the successful bidder within three months from the date of placement of order.
These type test reports shall be from Govt. / Govt. approved test house and shall not
be more than seven years old, reckoned from the date of placement of order. The
failure to do so will be considered as a breach of contract.
7.1.6b Routine Tests and Acceptance Tests
All routine and acceptance tests shall be carried as per relevant ISS in the presence of
Consultants & Clients representative.
7.1.7
INSPECTION
The material shall be inspected and tested before dispatch by an authorized
representative of the Consultant & Clients in respect of quality.
The inspecting officer shall also satisfy himself about the correctness of length of
cables. In case the supplier is not in a position to get these tests carried out at his
works, such tests may be got carried out by him at any Govt. recognized test agency at
his own expense.
7.1.8
TEST CERTIFICATES
The supplier shall supply test certificates from a Govt. agency in respect of quality as
per IS:7098(P-III)/1993 and IEC 60840 , IS 7098 (part-II) 1985 with latest amendments
thereof for approval of the purchaser for the same or higher size of cable.
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7.1.9
Technical Specification
66/11KV GIS Substation
PACKING
The cable shall be supplied in non-returnable wooden drum as per IS 10418:1982 so
constructed, as to enable the cable to be transported on each drum. The cable wound
on such drum shall be one continuous length. The ends of cables shall be sealed by
means of non-hygroscopic sealing material.
7.1.10 MARKING
The marking on the drum shall have the following information:
a) Reference to Indian Standard & cable code.
b) Name of the manufacturer & trade name.
c) Nominal cross section area of conductor for the cables.
d) Number of core.
e) Sequential no. at each meter.
f) Type of the cable & voltage for which it is suitable
g) Length of cable on the drum
h) Approximate gross weight.
i) Net weight of the cable.
j) Drum identification number
k) P.O. no. and date.
l) Consignee’s name with designation.
m) Year of manufacturing.
7.1.11 DRAWINGS & INSTRUCTION MANUAL
The tenderer shall supply the following drawings with the tender:i)
Detailed drawing of the cable showing conductor, screening insulation,
armouring, outer sheath etc.
ii)
Detailed drawing showing jointing of cable and sealing of end boxes.
Copies of instruction manuals for testing, installation jointing operation and
maintenance of cables shall also be submitted with the offer for reference of the
purchaser.
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Technical Specification
66/11KV GIS Substation
7.1.12 TECHNICAL & GUARANTEED PARTICULARS
The tenderer shall furnish guaranteed technical particulars as called for an appendix I
(schedule A) of this specification particulars, which are subject to guarantee shall be
clearly marked. Offer not containing this information will not be considered.
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Technical Specification
66/11KV GIS Substation
7.2.0
11KV H.T. CABLE
7.2.1
GENERAL CONDITIONS
For site conditions and other information, please refer to “General Conditions” attached
with the specification.
7.2.2
STANDARDS
The design, manufacture and testing of the Cables shall be carried out as per the latest
applicable Indian Standards, Indian Electricity Rules and Code of Practices. However,
for ready reference, some of the salient Standards and Code of Practices are given
below :
IS
:
7098
-
(Part II)
Cross-linked polyethylene insulated PVC sheathed
cables.
For working voltages from 3.3 KV upto and including
33 KV.
IS
:
3975
-
Mild steel wires, formed wires and tapes for armouring of
cables.
IS
:
5831
-
PVC insulation and sheath of electric cables
IS
:
8130
-
Conductors for insulated electric cables and flexible
cords.
Indian Electricity Rules 1956 and relevant Code of Practices.
7.2.3
SCOPE OF SUPPLY
The scope of supply shall include design, manufacturing, testing and supply of
stranded aluminium conductor, cross-linked polyethylene insulated (Heavy Duty)
cables of grade as per Annexure-II.
7.2.4
DESIGN DATA AND TECHNICAL SPECIFICATION FOR EQUIPMENT
7.2.4a System Details
01
Voltage
:
As per reqmt. + 10%
02
System
:
solidly earthed / unearthed
03
Frequency
:
50 Hz +3%
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Technical Specification
66/11KV GIS Substation
7.2.4b Requirements
01
All cables shall be designed and manufactured such that no damage occurs
during transportation, installation and operation of the cables under stipulated
conditions. The cable shall be manufactured with CCV process only.
02
The cable shall be laid partly in trays in air and partly in closed
trenches/tunnels.
03
XLPE cables shall be suitable for steady conductor usable temperature of 90
oC.
04
The maximum short circuit conductor temperature shall not exceed 250 oC for
XLPE cables.
05
All cables shall be armoured type.
06
The Cables shall be manufactured by only dry curing process using CCV line.
07
HT XLPE cable shall be of following construction and composition:
Aluminium conductor :
material
Electrical
IS:8130
purity
Aluminium
Conductor insulation :
Extruded semi-conducting
wires
as
per
compound
screening layer
Conductor insulation :
Cross-linked polyethylene
Core screening
Extruded semi-conducting com-pound followed by
:
copper tape screening and core identification
tape.
Inner sheath
:
Wrapped/Extruded
Armouring
:
Galvanised flat steel strip
Outer sheath
:
PVC compound conforming to the
Requirement of type ST2 compound of
IS:5831.
Core identification
08
:
Red, Yellow and Blue
All cables shall be supplied in standard drum lengths. The tolerance in drum
length shall be +5% whereas the tolerance for total length of each cable to be
supplied shall be +2%.
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7.2.5.
Technical Specification
66/11KV GIS Substation
INSPECTION AND TESTING SCHEDULE AT MANUFACTURER’S WORKS
The Bidder shall confirm to offer the above items for following Inspection/Testing which
may be witnessed by the Purchaser's representatives. The Bidder shall also confirm
that the Purchaser’s representatives will be allowed to inspect/test any of the items at
any manufacturing stage.
01.
Type tests on one cable drum of each size as follows:
a)
Tensile test for aluminium
b)
Wrapping test for aluminium
c)
Conductor resistance test
d)
Test for thickness of insulation and sheath
e)
Physical test for insulation and sheath
f)
Flammability test as per IS
g)
Test for bleeding and blooming of pigments
h)
High voltage test (water immersion test)
I)
AC High voltage test for 4 hours on HT XLPE cables as per Clause
19.7.1 of IS:7098 (Part-II).
02.
Routine tests on balance cable drums of each size as follows :
a)
Conductor Resistance test
b)
High voltage test
7.2.6. DELIVERY SCHEDULE
In order to maintain the overall time schedule for the Project Implementation, the
Bidder shall confirm to complete the delivery of cables within two months from letter of
intent.
7.2.7
INSTRUCTIONS TO BIDDER
01
The bid shall be complete with Technical Data Sheets as per Annexure-I.
02
The lengths of cables indicated are tentative and may vary by + 25%.
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Technical Specification
66/11KV GIS Substation
7.3.0
SPECIFICATION OF GAS INSULATED SWITCHGEAR
7.3.1
Standard Specifications
The switchgear shall conform to the following IEC standards:
Switchgear, general :
IEC 60694
Common specifications for high voltage
controlgear standards
IEC 62271-203
High-voltage switchgear and controlgear
switchgear
and
Part 203 : Gas-insulated metal-enclosed switchgear for rated
voltages above 52 kV
7.3.2
7.3.3
Circuit-Breakers:
IEC 62271-100
High-voltage
switchgear
and
controlgear
Part 100: High-voltage alternating-current circuit-breakers
IEC 62271-101
High-voltage
switchgear
Part 101: Synthetic switching
7.3.5
High-voltage
switchgear
and
controlgear
Part 102: High-voltage alternating-current disconnectors and
earthing switches
Instrument transformers:
IEC 60044-1
Current transformers
IEC 60044-2
Inductive voltage transformers
IEC 60044-6
Requirements for protective current transformers for transient
performance
Cable connections:
IEC 60859
7.3.6
controlgear
Disconnectors, Earthing Switches
IEC 62271-102
7.3.4
and
Cable connections for gas-insulated metal-enclosed switchgear
for rated voltages of 72.5 kV and above
SF6-Gas:
IEC 60376
Specification of technical grade sulfur hexafluoride (SF6) for use
in electrical equipment
IEC 60480
Guidelines for the checking and treatment of sulfur hexafluoride
(SF6) taken from electrical equipment for its re-use
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7.3.7
Technical Specification
66/11KV GIS Substation
Local Control Cubicles:
IEC 60439 -1 Low-voltage
switchgear
and
Type-tested and partially type-tested assemblies
7.3.8
control
gear
assemblies;
EMC:
IEC 60694
Common specifications for high voltage switchgear and controlgear
standards
The enclosures of the switchgear shall conform to the following EN standards:
7.3.9
Enclosure
EN 50052
Cast aluminium alloy enclosures for gas-filled high-voltage switchgear
and controlgear
EN 50064
Wrought aluminium and aluminium alloy enclosures for gas-filled highvoltage switchgear and controlgear
EN 50068
Wrought steel enclosures for gas-filled high-voltage switchgear and
controlgear
EN 50069
Welded composite enclosures of cast and wrought aluminium alloys for
gas-filled high-voltage switchgear and controlgear
EN 50089
Cast resin partitions for metal enclosed gas-filled high-voltage
switchgear and controlgear
7.3.10 Modular design
Housings and expansion joints should together form the pressure-resistant enclosure
of the switchgear. The housings shall be made of cast or welded aluminium, the
expansion joints of high-grade steel and the covers of steel or aluminium. The
switchgear modules are three-phase or single-phase encapsulated.
The manufacturing and testing of the housings shall have state-of-the-art technology.
Each housing is subject to a pressure and gas tightness test and complies with the
requirements of the relevant EN standard.
7.3.11 Surface Treatment
7.3.11.1 Steel (covers):
Indoor:
Outdoor:
hot
galvanised
and
hot galvanised and painted
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ESIC Hospital Faridabad
Technical Specification
66/11KV GIS Substation
7.3.11.2 High-Grade Steel (expansion joints):
Indoor
Pre-treatment:
Paint work:
none
none
Outdoor
Pre-treatment:
Paint work:
degrease
same as housings of cast aluminium
7.3.11.3 Cast-aluminium:
Pre-treatment (indoor and outdoor) :
sand-blast or degrease alkaline
Internal surfaces (cast-aluminium)
Seevenax protective paint RAL 7035
:
Internal surfaces (aluminium wrought alloy) : without surface treatment
External surfaces
material description:
high-resistant
polyurethane
hue:
RAL 1013
2-component
paint
gloss:
drying:
top coat:
silk
gloss
silk-matt
air
or
stove
dried
outdoor : Alexit top coat 5225, 5:1
indoor : Celerol top coat 362-24
reaction component :
Alexit
hardener
402
thinner:
Alexit
thinner
62
or
68
The used lacquers are free of harmful materials like cadmium, lead and chromic acids.
7.3.12 Gas, gas compartments, monitoring of gas compartments
•
SF6 shall serve as insulant for the enclosure of several separately-sealed gas
compartments
•
Static filters in all gas compartments shall absorb moisture and decomposition
products; the filter material shall be placed in filter bags which are supplied in airtight
cans
•
All gas compartments shall be equipped with rupture diaphragms and, if necessary,
with gas diverter nozzles. These nozzles are arranged in a way that, if the rupture
diaphragm bursts, the gas flow is guided away in a direction not unnecessary
hazardous to either personnel or equipment.
•
The modules of circuit-breakers (with current transformers), and voltage transformers
shall form separate gas compartments
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Technical Specification
66/11KV GIS Substation
•
The disconnector and three-position-switch gas compartment shall contain other
devices e.g. cable connection module.
•
The switch operating shafts shall be supported and provided with lip seals against
pressure and vacuum loss in such a way that during the evacuation process before
commissioning no air can penetrate and no SF6 can escape during operation; the
leakage rate is less than 0,5 % SF6 per year and gas compartment
•
The gas pressure shall be monitored by density monitors with indication; density
monitors are installed directly at the gas compartment they monitor
7.3.13 Busbar and three-phase connection module
•
The busbar module contains busbar disconnector and maintenance earthing switch
before the circuit breaker in form of a three position switch
•
Module conductors shall be linked by means of coupling contacts, which take up the
thermal expansion
•
Sectionalisers and earthing switches shall be installed in the three-phase bus bar run
•
Each busbar module forms a separate gas compartment and shall be sealed by means
of gas tight barriers against the adjacent modules
•
Expansion joints at each of the busbar modules allow for compensation of tolerances
and thermal contraction/expansion of the housings.
•
Shall have inbuilt current transformer and potential transformer.
•
Shall have in built surge arrestor.
7.3.14 Circuit-breaker
•
The circuit-breaker can be vertically or horizontal arranged. It should form the basis on
which the other modules of the bay are mounted.
•
Switching shall be actuated by means of a spring-charged operating mechanism for
triple-pole auto-reclosure.
•
The gas flow required for arc-quenching shall be generated in the interrupter units by
means of the puffer piston and cylinder (self-compression principle of SF6 gas in the
arcing chamber)
•
The control unit shall contain the drive mechanism and equipment for control and
monitoring of the circuit-breaker
•
The module shall form a separate gas compartment together with the CT module
•
Position indicators which are directly connected to the switching rod show the triplepole switching state. Auxiliary switches shall allow electrical monitoring of the switching
and intermediate positions
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Technical Specification
66/11KV GIS Substation
7.3.15 Three position switch (Disconnector-Maintenance Earthing Switch)
•
The three position switch shall combine both the function of a disconnector and a
maintenance earthing switch; due to that design an automatic interlocking shall be
assured
•
The three position switch shall be used in busbar disconnector modules, busbar
sectionaliser modules and in bay connection modules
•
Contacts shall be of pin and tulip design
•
Common motor operating mechanism for three poles shall be there.
•
Position indicators which shall be directly connected to the switching rod to show the
triple-pole switching state. Auxiliary switches shall allow electrical monitoring of the
switching and intermediate positions
•
Manual operation of the motor operating mechanism shall also be possible
7.3.16 Maintenance earthing switch
•
The maintenance earthing switches shall form a separate switching device
•
Contacts shall be of pin and tulip design
•
Common motor operating mechanism for three poles shall be there
•
Position indicators which shall be directly connected to the switching rod to show the
triple-pole switching state. Auxiliary switches shall allow electrical monitoring of the
switching and intermediate positions
•
Manual operation of the motor mechanism shall also be possible
7.3.17 Make-proof earthing switch
•
The make-proof earthing switches shall form a separate switching device
•
Contacts shall be of pin and tulip design
•
Common spring snap-action mechanism shall permit fast ON and OFF switching of all
three poles; the spring snap-action mechanism shall be charged by means of a DCmotor drive
•
Position indicators which shall be directly connected to the switching rod to show the
triple-pole switching state. Auxiliary switches shall allow electrical monitoring of the
switching and intermediate positions
•
Manual operation of the spring snap-action mechanism shall also be possible.
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Technical Specification
66/11KV GIS Substation
7.3.18 Current transformers
•
The current transformers shall be of inductive single-conductor type (the primary
conductor of the switchgear is the primary winding with one turn). The secondary
windings shall be fixed on toroidal cores.
•
Termination of the secondary windings shall be located in the integrated local control
cubicle Multiple ratios are made possible by taps of the secondary winding. Connection
of the various taps shall be made in the integrated local control cubicle.
•
Various cores for measuring, metering and protection purposes shall be possible
7.3.19 Voltage transformers

Inductive voltage transformers shall be consist of an iron core, the single-step primary
winding with the HV electrode, the secondary windings and the HV terminal; all
windings shall be designed as layer windings with plastic foil insulation
•
Voltage transformers shall form a separate gas compartment
•
Terminal box for connection of the secondary terminals
•
Separation from the high-voltage part of the switchgear for HV cable testing shall be
possible
7.3.20 Local control cubicle
•
The local control cubicles shall be integrated in the switchgear bay. The bay shall be
supplied with extremely comprehensive cabling of all operating mechanisms and
instrument transformers.
The local control cubicle shall be equipped with
•
The local and remote control facilities shall include interlocking for all HV switching
devices of a bay.
•
The necessary components like relays, MCB´s, A-meters and V-meters, terminals,
cable channels, anticondensation heaters etc shall be included.
•
Visual alarm indications.
With the exception of the current and voltage transformer cables and the customer's
own in feeds all control cables shall be plug-connected.
7.3.21 Interfaces to others
Primary side:
•
The cable connection housings shall be without cable sealing ends acc. to IEC 60859
•
The terminal studs/plates of the SF6/air bushings acc. our interface drawing
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Technical Specification
66/11KV GIS Substation
Secondary side
•
The cable plug connections and outgoing terminal blocks in the local control cubicles
7.3.22 EMC
A variety of EMC control measures shall be considered in the design
•
Screening measures in the current and voltage transformers
•
High-frequency-compatible shielded measuring and control cables
•
Shielding and earthing of electronic modules
•
High-frequency-compatible design of earthing for building and GIS
7.3.23 Earthing material
All necessary material required for the connection of the switchgear to the embedded
grounding and potential grading grid, provided by the customer in the foundation plate,.
The switchgear bay shall be earthed via the circuit breaker, the cable connection
housings, the transformer connection modules and the SF6/air bushings
7.3.24 Fixing of the switchgear and details for the switchgear building
The base of circuit breaker shall be fixed to the floor via anchor rails (e.g. Halfen),
supplied and mounted by the civil contractor. Other methods are also possible.
7.3.25 Dispatch
The dispatch units shall be fixed at the factory with respect to the layout of the
switchgear modules. Delivery of one complete feeder without the interface modules in
one dispatch unit shall be possible depending on the switchgear design. The other
modules like voltage transformers, SF6/air bushings, will be packed separately.
7.3.26 Routine tests at switchgear factory (acc. to IEC)
The routine tests of the switchgear shall be carried out in accordance to IEC 62271203. The tests shall be performed on individual devices or transport units. All tests of
the production process including the routine tests shall be listed in the inspection and
test plan (chapter “Quality assurance”). The factory acceptance test program shall also
be described in the chapter “Quality assurance”.
7.3.27 Maintenance
Metal-enclosed SF6 insulated switchgear shall require extraordinarily little maintenance. The maintenance effort recommended shall be limited to those parts which are
subject to wear or ageing. The time and extent of the work shall be carried out based
upon:
•
The number of short-circuit operations
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Technical Specification
66/11KV GIS Substation
•
The switching frequency and
•
The operating time
7.3.28 Inspection and maintenance services
after 8 years
visual check, gas compartments need not be opened
after 16 years
visual check, gas compartments need not be opened
after 24 years
major inspection, opening of the gas compartments depending
on condition of contacts
after 32 years
visual check, the inspection and maintenance schedule is
repeated.
7.3.29
66 kV CONTROL AND RELAY PANEL
7.3.29.1
SPECIFIC REQUIREMENT
The Control & Relay panel required for 66/11kV switchyard shall be detailed below
66 kV Transformer C&R Panel for HV side of 66/11kV
a.
Transformer
-
2No.
b.
66kV C&R panel for line feeder
-
1No.
c.
Buscoupler feeder
-
1No.
7.3.29.2 The panels for 66 kV shall be of Simplex type consisting of separate cubicles for
each circuit and made of sheet steel of thickness not less than 10SWG for the base
frame, door frame, and front portion of the cubicle not less than 14SWG for door, side,
top and bottom portion having provision for extension at both end with internal wiring
illuminations door operated on and off switch. The cubicle shall be suitable for floor
mounting with its bottom open. Each cubicle shall be fitted with flush mounted steel
hinged door and locked at the back and all equipments will be mounted in front.
7.3.29.3 Dimensions
a.
Depth of the panel – 610 - 1000mm
b.
Height of switchboard above base frame – 2210mm
c.
Height of base frame – 102mm
7.3.29.4
AUXILIARY POWER SUPPLY
a.
AC Supply – 415/240 3phase, 4 wire 50Hz
b.
Voltage variation - + 10%
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Technical Specification
66/11KV GIS Substation
c.
Frequency - + 3%
d.
DC Supply – 220V (+ 10%), 2wire
7.3.29.5
MIMIC SCHEME
Suitable painted mimic diagram will be reproduced on the panels covered by the
specification. Automatic semaphores for indicating open and closed position of circuit
breakers, isolators and earth switch shall be suitably incorporated in the mimic
diagram.
7.3.29.6 SUPERVISION SCHEME
A.
The 66 kV Control & Relay Panel shall be provided with the following supervision
lamps
a) Circuit breaker Close
-
Red
b) Circuit Breaker Open
-
Green
c) Auto Trip
-
White
d) Spring Charged
-
Blue
For monitoring of entire trip circuit both in open and closed position of the circuit two
number automatic trip circuit supervision relays are proposed for 66 kV panels as
breakers being are gang operated with two trip coils for 66 kV.
B.
Trip Circuit Supervision Relay
a.
The relay shall be capable of monitoring the healthiness of each trip coil and
associated circuit breaker during ON and OFF conditions.
b.
Auto trip lamps shall be wired on 220V DC whereas circuit breaker OPEN and
CLOSED and SPRING CHARGED lamps shall be wired so as to be on 220V
AC under normal conditions with automatic change over relay to change them
over to 220V DC supply in the event of failure of AC supply.
c.
Glass / plastic lenses of appropriate colour shall be screwed into front of the
lamp body. The design of indication lamps be such as to facilitate replacement
of fuse lamp.
d.
An engraved label indicating the purpose of the lamp shall also be provided with
each lamp.
7.3.29.7 SEMAPHORE INDICATORS
Automatic semaphore relay of the under mentioned type shall be provided to mimic the
position of circuit breakers, isolators and earth switches in the mimic diagram painted
on the control and relay board.
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Technical Specification
66/11KV GIS Substation
The control and relay panel covered by the specifications shall be provided with supply
failure type semaphore to show ON & OFF position of the circuit
breakers/isolators/earth switch. When the supply failure to the semaphore occurs the
pointer shall take up an immediate position to indicate the supply failure.
The operating coil of the semaphore relay shall be continuously rated and shall be
suitable for use with 220V DC
The semaphore relay shall work adequately between 10 % - 120% of rated dc voltage
7.3.29.8 NON TRIP ALARM SCHEME
Each of the Control & Relay panel shall have independent non trip alarm scheme the
scheme shall generally confirm the following.
The closing of an initiation contact shall sound a hooter and lighten annunciator –
indicating lamp. It shall be possible to silence the hooter by pressing accept button.
By pressing the reset push button the individual indicating lamps shall be extinguished
provided that the troubled contact has opened. The resetting shall be possible only
after the alarm is accepted.
Lighting of an annunciator lamp shall not interfere or cause false operation of any other
annunciator lamp. Whether lighted simultaneously or in sequence operation of reset
push button shall not cause the alarm to sound whether or not the trouble contact is
closed.
With the help of lamp test push button it shall be possible to test all the lamps in group.
The lamps for visual annunciation system shall have separate compartment behind
inscribed translucent window. These shall be so arranged that illumination from
compartment shall not light adjacent window.
The equipment shall operate on 220V DC and shall be complete with alarm accept
alarm reset and lamp test push button.
Only static fascia alarm scheme is accepted.
7.3.29.9 ALARM SCHEME FOR TRIP ALARM
The trip command due to operation of protective relays will trip the breaker. Its auxiliary
contact will actuate valve and will be cancelled by the circuit breaker control handle.
Auto trip lamps will glow on the concerned panel and there will be flag indications on
the concerned protective relay/auxiliary relay of the panels.
7.3.29.10 DC FAIL ALARM SCHEME
A suitable relay for monitoring the trip circuit DC wiring of the Control & Relay panel
shall be provided. The operation of the DC fail scheme shall be accompanied by visual
(indicating lamp of amber colour on the concerned panel) and (auto ringing of the
common buzzer) annunciation. It shall be possible to silence the buzzer by pressing
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Technical Specification
66/11KV GIS Substation
the accept push button while lamp shall continue to glow. Till the fault has been
attended to & DC supply restored a DC fail test push button may be provided to test
the lamp circuit of the scheme.
7.3.29.11 METERING SCHEME
A.
All indicating and integrating instruments shall be of switchboard type back connected
suitable for flush mounting and provided with the dust and burning proof cases and
finished in egg cell bright black colour and shall be calibrated to read directly the
primary quantities. All fixing screws nuts and threaded parts shall be designed to
relevant IS. All the instruments (voltmeter, frequency meter & wattmeter) shall be in
square pattern case and shall conform to the provisions of the latest edition of IS 1248
and IS 2419 or relevant IEC standards. The nominal size of these indicating
instruments shall be 96 sqmm. Energy meter shall confirm to provision of IS 722
amendements up to date or relevant IEC.
B.
Ammeters
Ammeters shall be suitably scaled and provided with the selector switch facilitating the
measurements of phase currents as well as the unbalanced currents. The coil of the
ammeter shall be rated 1A for 66 kV level. The instrument shall be of moving iron
spring controlled type of industrial grade A classification with accuracy class 0.5.
C.
Voltmeters
Voltmeters shall be suitably scaled and provided with selector switch to facilitate the
measurements of phase to phase and phase to neutral voltage of all the three phases
one by one. The coil of the voltmeter shall be rated 220V (P-P) wherever asked with
selector switch and 230/√3 if asked without selector switch. The instrument shall be of
moving iron spring control type of industrial grade A classification accuracy class of 0.5
and shall confirm to IS 2148 or relevant IEC standard.
D.
Digital Bus Voltage and Frequency Meters
Digital voltage & frequency meters shall be of class 0.5 and shall have a digital display
of 4.5 and 4 digits respectively. With display size not less than 25mm.
E.
Megawatt hour meter
All 66kV feeder Control & relay panels shall be provided with export import type
megawatt hour meter.
F.
Frequency meter
It shall have a range of 45 to 55Hz. The instrument shall be moving iron spring control
type of industrial grade A classification confirming to relevant IS.
All the above mentioned meters shall be of digital type.
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Technical Specification
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7.3.29.12 Control Switch for Circuit Breakers
a.
It shall be possible to close the circuit breaker from control room. For this purpose
pistol grip control switches and of spring return to neutral position type non lockable
handles with alarm cancellation contact shall be provided for opening circuit breakers.
These shall be so designed that after being operated to close the circuit breaker the
operation cannot be repeated until the switch has been turned to a trip position making
it impossible to perform to closing operation consecutively.
b.
The rating of the control switch contact shall be suitable for the duty imposed by the
closing and opening mechanism of the circuit breaker and shall confirm to the
recommendation which may be made by the supplier of the circuit breaker.
7.3.29.13 AUTO RECLOSING
The protective scheme shall incorporate the necessary equipment to impart auto
reclosing impulse to the circuit breaker when it has tripped either due to the operation
of the line protection scheme in the first zone or the accelerated operation of it with the
help of carrier equipment. No auto reclosing impulse shall be transmitted in the event
of the fault cleared by the second and third zone of line protection scheme. Auto
reclosing will also be blocked in case circuit breaker is tripped manually.
7.3.29.14 PROTECTION SCHEME
1.
2.
Protection of Power Transformer
a.
Transformer differential numerical protection
b.
Numerical backup earth fault relay
c.
Numerical Restricted earth fault protection
d.
Numerical non directional over current & earth fault relay
e.
Over voltage ,undervoltage,overfrequency,underfrequencyrelay
f.
Auxilary relays (Oil temperature trip, Winding tempt. Trip, Pressure relief
trip, Buchholz protection)
g.
Over fluxing relay
h.
Intertripping relay
Protection of Line
a..
Non directional over current & earth fault relay
b.
Auxiliary relay to pole discrepancies
All the relays shall be Numerical Communicable type.
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7.3.30
Technical Specification
66/11KV GIS Substation
SURGE ARRESTERS
7.3.30.1 Surge Arresters (SA) shall be single pole, heavy duty, station class, pedestal
mounted of self supporting construction. Each unit of arrester assembly shall have
the requisite active element with non linear characteristics hermetically sealed under
dry inert gas and fully protected against ingress of moisture. The seal shall be
designed and tested to last to last for the worst operating conditions for the surge
arresters. The arresters shall be provided with end fittings made of corrosion proof
material.
7.3.30.2 The active element shall be composed of metal oxide which impart non ageing, non
linear resistance characteristics and stable thermal properties to the element. The
element shall be metalised on their flat surfaces for ensuring excellent interfacial
contacts and insulated on their cylindrical sides to prevent surface flashover.
7.3.30.3 Discharge counter mounted on the insulating base and suitably enclosed for outdoor
use shall be provided for each pole. It shall be a self contained unit requiring no
auxiliary or battery supply for operation. The cyclometer counter shall be visible
through an inspection window. Terminals of the counter shall be suitable for
connecting them to the SA base with minimum possible bends on the connection
leads.
7.3.30.4 The SA shall be provided with shielding rings for voltage grading on the surface of
the insulator housing.
7.3.30.5 The SA shall be provided with pressure relief device and arc diverting ports to
prevent shattering of porcelain housing and providing path for the flow of the rated
fault current in the event of failure of the arrester.
7.3.30.6 The SA shall be suitable for repeated successful operations under both operating
duty and long duration discharges and shall provide maximum protection to the
electrical equipment against lightning and switching surges.
7.3.30.8 The SA shall be suitable for wet live line insulator washing.
7.3.30.9 Porcelain used in insulators housing the active parts of SAs shall be homogeneous,
free from laminations, cavaties or any other flaw which may affect its mechanical and
dielectric qualities and radio interference performance. It shall be thoroughly vitrified,
tough and impervious to moisture. Glazing of porcelain shall be of uniform brown
colour, free from blisters, burns etc.
All surface of ferrous metal parts shall be shot blasted and chemically treated to
remove all rust, scales, grease or other adhering foreign matter before galvanizing.
The surface shall be hot double dip galvanized.
All metal parts not accessible for galvanizing shall be made corrosion resistant
materials. All machinised and bright surfaces shall be coated with an approved
suitable rust preventive compounds and wrapped or otherwise protected.
7.3.30.10 Rating plates made rust proof material with arrester parameters written indelibly
shall be provided on sub assemblies and complete surge arresters at appropriate
locations.
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Technical Specification
66/11KV GIS Substation
RATINGS AND REQUIREMENTS
1.0
Type
Single pole, heavy duty, Station
class, gapless, pedestal mounted
2.0
Installation
Outdoor
3.0
Construction
Single phase
4.0
System Details
a)
Highest system Voltage
72 kV rms
b)
Frequency
50+5%
c)
System Neutral
Effectively earthed
d)
Maximum value of temporary
Over Voltage and its max. duration

Insulation level of the equipment
650kVp
to be protected

System short circuit level
31.5kA for 1sec

SA connection to system
Phase to Earth

Equipment to be protected
Transformers/ Transmission
Lines

Rated voltage of SA

Maximum continuous
Operating voltage
60kV
72kV rms
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7.4.0
Technical Specification
66/11KV GIS Substation
SPECIFICATION OF 11 KV HT PANEL
7.4.1. GENERAL INFORMATION
Any material or accessories which may not have been specifically mentioned but which
is necessary usual for satisfactory and trouble free operation and maintenance of the
equipment, shall be furnished by you.
7.4.2. SCOPE OF WORK
The specifications cover the detailed requirements for supply testing & commissioning
of High voltage Panel Board.
7.4.3
DESIGN CRITERIA
The panel board shall be rated for 11KV, 3 phase 50Hz, indoor type, having incoming
and outgoing switch gear as specified. The degree of enclosure protection shall be in
accordance with the schedule of quantities.
7.4.4
SPECIFIC REQUIREMENTS
H V PANEL BOARD
7.4.4.1 RATING
All panels assembled to form a board shall be suitable for the nominal operation
voltages and rupturing capacity of 25 KA for unearthed system as specified in BOQ.
They should be rated as specified with a minimum 1200 amps or as per BOQ outgoing
breaker suitable for operation on 3 phase 50 Hz system Type test certificate for the
breaking capacity of the panel shall be supplied.
7.4.4.2 TYPE
The HV panel Board shall be metal clad, indoor, cubicle floor mounting free standing
type. It shall be total enclosed dust, and vermin proof, There will be sufficient
reinforcement to have level surface, resistance to vibration rigidly during transportation
and installation. Cable entry shall be from BOTTOM as per site condition. All under
voltage tripping shall be integrated with existing panels.
7.4.4.3 GENERAL CONSTRUCTION:
Separate compartments shall be provided for each circuit breaker, bus bars and Cable
boxes which fully and effectively segregates from one another so that fault in any one
compartments should not cause damage to equipment in other compartments. All
steel work will undergo a process of degreasing pickling in acid, cold rinsing,
phosphating and then sprayed with high corrosion resistant primer.
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Technical Specification
66/11KV GIS Substation
The housing shall be of welded construction to ensure compact and rigid structure
presenting a neat and pleasing appearance. The channels used shall be not less than
3 mm thick and sheet not less than 2.0 mm thick. Final painting will be done by the
application of synthetic enamel paint of approved shades.
Panels shall be bolted together to form a continuous flush front switch gear suitable for
front operation draw out type and for extension in future.
7.4.4.4
GENERAL DESIGN ASPECTS
VCB circuit breaker will be three pole design with trip free independent spring charged
motor operated closing mechanism. Shunt trip coil for tripping will be suitable for
operation at 220V D.C. The spring charged motor shall be suitable to operate at 230V
AC supply. It should be possible to close and trip the breaker in case of auxiliary supply
failure. Under voltage tripping shall be integrated with existing panels.
The HV panel board shall be designed such that the switch gear instruments relays
bus bars small wiring etc. are arranged and mounted with due consideration for the
following.
7.4.5
i.
Facility for inspection maintenance and repairs testing terminals boards for case
to external connection.
ii.
Minimum noise and vibrations.
iii.
Removal of accidental short circuit and open circuit.
iv.
Secured and vibration proof connections for power and control circuits.
v.
Risk of accidental contact and danger to personnel due to live connections.
CIRCUIT BREAKER
7.4.5.1 The circuit breaker panel shall be complete with the following :
a.
Breaker will trip while racking out in close position.
b.
Breaker will trip while racking in at close position.
c.
The LV plug with the breaker in operating position cannot be disconnected.
d.
To remove the breaker beyond particular position without disconnecting LV plug
and viceversa should not be permissible.
e.
Smooth inserting and withdrawing mechanism.
f.
Isolating plugs and sockets with all its auxiliary circuits and interlocking circuits
shall be able to operate for smooth operation in test position.
g.
Mechanical inter-locks and safety shutters with pad looking facility.
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h.
Technical Specification
66/11KV GIS Substation
Mechanical ON/OFF indicator.
i.
6 No. and 6 NC auxiliary contacts rated 10 amps and 220V, DC directly
operated by the circuit breaker.
j.
Vacuum interrupting bottles of westing house make or equivalent imported
reputed make. If another make of vacuum bottle is used, it must be clearly
mentioned in tender covering page.
k.
Anti condensation space heater suitable for operation on 240 V single phase
has 50 HZ AC on each panel.
l.
Tripping arrangements : shunt trip on 220Volt, DC Supply.
7.4.5.2 TYPE
The circuit breaker shall be vacuum interrupter type for the rating specified. The circuit
breaker shall be horizontal draw out pattern.
7.4.5.3 BREAKER TRUCK
The breaker carriage shall be fabricated from steel, providing a sturdy vehicle for the
vacuum interrupting bottles and its operating and tripping mechanism. The carriage
shall be mounted on wheels moving on guides, designed to align correctly and allow
easy movement of the circuit breaker and for removing the carriage for test isolation
inspection and maintenance purposes.
The carriage shall have the spring charged mechanism through electrical motor for
charging isolating the breaker from the bus bars and cable spouts. The draw out
mechanism shall be provided with facility for pad locking at any position namely.
"Service" "Test" and fully isolated. It should be possible for testing the circuit breaker
for its operation without energising the power circuit in the Testing position.
7.4.5.4 BREAKER INTERRUPTING BOTTLES
The interrupting bottles shall be vacuum type sealed interrupting contacts.
7.4.5.5
GENERAL FEATURE
The contacts shall be double break design having ample area and contact pressure to
carry the rated as well as short circuit current without excessive temperature rise.
7.4.5.6 RATING
The vacuum circuit breakers shall be continuously rated as specified with a minimum of
1200 amps for incoming and outgoing breaker as per BOQ with voltage rating and
breaking capacity of 500 MVA.
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Technical Specification
66/11KV GIS Substation
7.4.5.7 OPERATING MECHANISM
The operating mechanism shall be one of the following as specified.
Electrical motor wound & spring closing with external command along with manual
operating facilities when power is absent having Electrical & Mechanical closing
release.
7.4.6
BUS BAR SECTION
7.4.6.1 GENERAL REQUIREMENT
The switch board shall be single bus bar pattern with air insulated encapsulated bus
bars housed in a separate compartment segregated from other compartment.
Inspection covers shall be provided to facility inspection bus bar assembly and for
cleaning. In case of access to the bus bars by removing the inspection cover, no
dismantling of units, wiring etc. shall be necessary. Each unit chamber shall be
separated from adjacent unit by insulating barriers.
7.4.6.2 MATERIAL
The bus bar shall be of high conductivity electrolytic grade aluminium as specified with
minimum of 800 amps. The bus bars shall be sized for carrying the rated and short
circuit current without overheating. Maximum bus bar temperature shall not exceed
60C under normal operating conditions.
7.4.7 CURRENT TRANSFORMER
7.4.7.1 GENERAL REQUIREMENT
Accommodation shall be provided in the circuit breaker panel, to mount one set of
CT’s for metering and protection. Access to the CT’s for cleaning, testing or changing
shall be from the front, back or top of the panel.
7.4.7.2 RATING
Combined CT’s for metering and protection of suitable burden (but each not less than
15 VA) shall be preferred with 1/ 5 amps secondaries (as per BOQ) unless otherwise
mentioned specifically. Protection class shall be 5P 20 and metering class shall be 0.5.
The CT’s shall conform to relevant Indian Standards. The design and construction shall
be dry type epoxy resin cast robust to withstand thermal and dynamic stresses during
short circuits. Secondary terminals of CT’s small be brought out suitable to a terminal
block which will be easily accessible for testing and terminal connections. The
protection CT’s shall be of accuracy class 5 P 20 of IS 3156 and IS 2705 - Part III –
1992
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ESIC Hospital Faridabad
7.4.8
Technical Specification
66/11KV GIS Substation
PROTECTION AND TRIPPING ARRANGEMENT
7.4.8.1 PROTECTIONS
The protection and tripping arrangement of circuit breaker shall be:
7.4.9
a)
One number numerical microprocessor based separate three phase IDMT with
instantaneous element over current relay and earth fault in breakers shall be
provided in transformer outgoing feeders.
b)
Lockout and trip supervisory relays etc. shall be provided in all breakers.
c)
3 Auxiliary relay for buckholz, oil pump, winding temp. in transformer outgoing
feeders only.
RELAYS
Over current Relays shall have adjustable setting for current from 50% to 200% and
earth fault from 10% to 40%. The IDMT should be of reset type. Instantaneous element
shall be from 200% to 800%. All relay shall have a indicator which will indicate
operation for malfunction. It shall be possible to reset only by manual operation. The
number and types of relays shall be specified in BOQ. Electromechanical & numerical
microprocessor based relays shall be programmable at site.
7.4.10 CONTROL WIRING
The control wiring shall be carried out with minimum 2.5 sq mm. PVC insulated copper
conductor cables. The wiring shall be securely fixed neatly arranged to enable easy
tracing of wires. Identification PVC ferrules shall be fitted to all wire terminals to render
easy identification and facilitate checking in accordance with IS 5578 and 1S 1353.
Necessary final blocks and cable entire shall be provided for Buchholz relay wiring
power supply etc.
7.4.11 METERING INSTRUMENT PANEL ACCESSORIES :
7.4.11.1 INSTRUMENT PANELS
The instrument panel shall be part of the housing. Relays, meters and instruments shall
be mounted as per general arrangement drawings to be submitted by the vendors.
They shall be of flush mounting type.
7.4.11.2 INSTRUMENTATION’s
a)
A Voltmeter of class 1.0 accuracy and 96X96 mm square in size as per IS 1248 shall be provided at each incomer panel with selector switch. The
instrument shall be calibrated for the ranges specified as per BOQ.
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Technical Specification
66/11KV GIS Substation
b)
Ammeter of specified range to class 1.0 accuracy as per IS - 1248 shall be
provided at both incomer and outgoing panels along with necessary selector
switches or as per BOQ.
c)
Kilowatt meter, P.F. meter or digital multifunction meter in outgoing feeders.
d)
The board assembly shall also care of the following requirements:
e)
Lamp indication shall be provided to indicate ON/OFF (By red/green
respectively) of switch gear along with trip indication at 220 volt D.C.
i)
Separate MCB's shall be provided for lamps, heaters and voltmeters, other
instrumentation etc. on each panel.
ii)
Anti-condensation space heaters suitable for operation on 240 V single phase.
50 Hz A.C. for each panel. Supply & control equipment for the above shall be
provided by the vendors.
iii)
Where there is more than one incomer and bus sections these shall be castle
key and or electrical interlocked as per interlocking scheme where specified.
f)
Three elements of over current and one element of earth fault along with
instantaneous high set element shall be provided in all outgoings feeders to
transformer.
7.4.12 CABLE BOXES
Cable boxes shall be suited in a compartment at the rear side of the housing or as
specified cable boxes shall be complete with brass glands suitable for XLPE cable to
be terminated with heat shrinkable cable terminations.
7.4.13 DRAWINGS / DOCUMENTS REQUIRED FOR REVIEW / APPROVAL
Following drawings documents shall be submitted by the manufacturer for records and
approvals.
a)
General arrangement (GA) of equipment layout.
b)
Equipment list.
c)
Relay and metering system schematics.
d)
Supply & testing schedule. Testing to be carried out in the presence of owner
e)
All control cables required for external use for interconnections.
f)
Catalogue and specification sheets.
g)
Wiring diagram for integration with existing VCB Panels.
h)
Front facia of expansion panels should match with existing VCB panel
including G.A
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Technical Specification
66/11KV GIS Substation
7.5.0
NEUTRAL GROUNDING RESISTOR
7.5.1
The Neutral Grounding Resistor (NGR) shall be used for non- effective grounding of
HV System of the plant. NGR shall be connected between the equipment Transformer
neutral point and earth.
Neutral Grounding Resistor shall be used to limit the magnitude of earth fault current so
that damage of Electrical equipment is reduced, safety of personnel is increased and
sensitive / selective earth fault protection can be provided.
The NGR will be installed in hot, humid and tropical atmosphere. All equipment,
accessories and wiring shall be provided with tropical finish to prevent fungus growth.
The Resistor unit shall be air-cooled type suitable for installation at outdoor locations.
The resistror enclosure shall be made of sheet steel and shall have minimum thickness
of 2 mm.
7.5.2
Resistor
The resistor element shall be made of non-aging stainless steel punched grid having
high electrical resistivity and low temperature co-efficient of resistant. The resistor unit
shall consist of a number of elements. All the elements shall be mounted inside the
cubicle so as to ensure ease of inspection and replacement of individual element.
Overall temperature of stainless steel punched grid shall not exceed 375 degree C.
Each Resistor element shall possess a balanced combination of both Mechanical and
Electrical properties over the entire intended operating temperature range without any
harmful effect on the elements and their accessories.
All the resistor elements constituting the NGR shall be assembled and supported inside
the cubicle in such a way that no distortion or breakage will occur during the passage
of through fault current to earth.
All element connections shall be bolted type to ensure stable resistance value
throughout the working life of the unit.
Wet process type brown glaze porcelain insulators shall be used for supporting resistor
elements.
7.5.3
Enclosure
Each neutral grounding resistor shall have structural work enclosed on all sides and
also on top by sheet steel. Suitable ventilating louvers shall be provided on sides to
ensure proper ventilation. The louvers shall be provided with fire wire mesh to make it
vermin proof..Each enclosure shall be self supporting, weather proof type suitable for
outdoor mounting having a protection class as indicated in annexure.
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Technical Specification
66/11KV GIS Substation
Each cubicle shall be complete with a front access door with handles, lock and also a
removable bolted cover. All doors and removable covers shall be properly gasketed
with neoprene rubber gaskets. All cubicle door hinges shall be concealed type.
Each cubicle shall be complete with a suitably mounted cable end box fitted with
removable gland plate for fixing cable gland. The cable size shall be as indicated in
the annexure. Double compression cable glands and tinned copper lugs shall be
provided.
Each cubicle shall be provided with suitable base channels for direct bolting to the
foundation at site. All necessary galvanized bolts, nuts, washers etc. shall be supplied
by the Tenderer for installation of Cubicle at site.
7.5.4
Cubicle lamp and sockets
Each cubicle shall be provided with 5A, 3 pin plug socket and door-switch controlled
cubicle illumination lamp.
Two pole switch fuse unit shall be provided for receiving 240 V single phase AC supply
for cubicle lamp and illumination circuit.
7.5.5
Wiring
All internal wiring between equipment and terminal block shall be carried out by PVC
insulated 1100 V grade 2.5 Sq.mm Stranded copper conductor wires.
All wiring shall be suitably ferruled with corresponding wiring identification marks used
in the Schematic/wiring diagrams.
All devices and terminal blocks within the terminal box shall be clearly identified by
symbol corresponding to those used on applicable schematic/wiring diagram.
7.5.6
Grounding
All parts of enclosure, supporting structures, equipment frames etc. shall be properly
grounded at two points.
Each cubicle shall be complete with two (2) nos. ground pads, tapped holes and bolts
suitable for connection of 75 x 8 mm galvanised steel flats.
7.5.7
Auxiliary equipment-Current Transformer (CT)
Neutral bushing current transformers shall be furnished when specified in the
annexure.
Current transformer shall be mounted inside the cable box with removable
arrangement
CT secondary leads shall be wired upto the termin.
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Technical Specification
66/11KV GIS Substation
7.6.0
BATTERY & BATTERY CHARGER
7.6.1
The battery & battery charger will supply all D.C. load for 66KV switchyard. The
equipment will be installed indoor in a clean but hot, humid and tropical atmosphere.
7.6.2
The battery & charger combination shall be such as to ensure continuity of DC supply
at load terminals at all times without even momentary interruption. Further the voltage
at load terminals shall never exceed the limits of + 10% and - 15% of the nominal
system voltage.
7.6.3
Each battery shall be sized to meet DC load duty cycle requirements for at least one
(1) hour for entire switchyard & switchyard control/metering room.
7.6.4
For continuous operation at specified ratings, temperature rise of the various
components of battery & battery charger shall be limited to the permissible values
stipulated in the relevant standards and/or this specification.
7.6.5
System Concept
220V DC System
7.6.6
i)
DC system shall consist of one (1) float and one (1) float cum boost charger
and one (1) battery.
ii)
The characteristics shall be such that if load is high and exceeds the charger
capacity then the excess load will be supplied by the battery.
iii)
The float cum boost charger will be normally in stand-by (auto float/charge)
mode and will cut into the circuit automatically (a) to provide occasional
equalising charge as required, (b) to take over the functions of float
charger in case of its failure.
iv)
The boost charger shall also have provision for float, equalising and boost
charging the battery through manual selection.
v)
On failure of station A.C. supply both float and boost chargers will go out of
service and battery will take over to supply station emergency loads.
Battery
General
a.
The battery shall be low maintenance, tubular, VRLA
b.
The plates shall be designed for maximum durability during all service
conditions including high rate of discharge and rapid fluctuation of load.
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Technical Specification
66/11KV GIS Substation
Construction
a.
The battery shall be Vented Type tubular, VRLA type and shall be capable to
supply a continuous D.C. load for switchyard auxiliaries.
b.
The plate shall be designed for maximum durability during all service conditions
including high rate of discharge and rapid fluctuation of load.
c.
Each cell shall be of high strength alkali-resistant material non-porous material.
d.
Electrolyte level shall be marked on clear glass container or level indicators as
applicable. The markings shall be for upper and lower limits.
e.
The venting device shall be anti-splash type and shall allow gases to escape
freely and shall effectively prevent the electrolyte from coming out. Provision
shall be made for drawing the electrolyte samples, checking and topping up of
electrolyte.
f.
The electrolyte used shall be a solution of potassium hydroxide in distilled
water.
g.
The Separator used for the cells shall be porous, alkali-resistant and have
insulating capacity to avoid shorting or leakage of the current between
plates of opposite polarity. The separator shall also be dimensionally stable
without deformation at the temperature of use.
h.
The cell terminal posts shall be provided with connector bolts and nuts.
i.
The cells shall be supported on porcelain insulator fixed on to the rack with
adequate clearance between adjacent cells.
j.
Copper connectors shall be provided to connect up cells of Battery set.
k.
Positive and Negative terminals posts shall be clearly and indelibly marked for
easy identification.
l.
Copper plate, tubular copper lugs, clamp, bolts, nuts, washers etc. shall be
provided for connection to out-going cables.
n.
The Battery shall be delivered in uncharged condition with the electrolyte
furnished in a separate non-returnable container. Ten percent (10%) extra
electrolyte shall be furnished to cover spillage during transport and erection.
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Technical Specification
66/11KV GIS Substation
Racks
7.6.7
a.
The racks for supporting battery cells shall be constructed of best quality
mild steel, painted with at least three (3) coats of anti-alkali paint
of
approved shade based on type battery.
b.
Racks shall be free standing type, mounted on porcelain insulators.
c.
Numbering tags for each cell shall be attached on to the racks.
Battery Charger
General
a.
The charger shall be natural air cooled, solid-state type with full wave, fully
controlled, bridge configurations.
b.
The charger shall be provided with automatic voltage regulation, current limiting
circuitry, smoothing filter circuit and soft-start feature.
c.
Voltage control shall be stepless, smooth and continuous.
d.
The charger shall be self-protecting against all A-C and D-C transients and
steady state abnormal currents and voltages.
e.
Charger A-C input and D-C output shall be electrically isolated from each other
and also from panel ground.
Isolation shall also be provided between power and control circuits.
Construction
a.
The charger shall comprise a continuous line up of free-standing, floor mounted
sheet steel panels, with all access from the front.
b.
The panel shall conform to the degree of protection IP 42. Minimum thickness
of sheet metal used shall be 2 mm.
c.
Access doors shall be with concealed hinges and neoprene gaskets.Ventilating
louvres shall be covered with fine wire mesh.
Door over 600 mm width shall be of double-leaf design.
d.
All equipment within the panels shall be arranged in modular units and laid out
with sufficient space for easy maintenance.
e.
Switches, meters, relays etc. shall be flush mounted on the front of the panels.
Nameplates of approved size and type shall be provided for all circuits and
devices.
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7.6.8
7.6.9
Technical Specification
66/11KV GIS Substation
Charger Equipment
a.
All power diodes and control rectifiers shall be silicon type.
Rectifier
transformer shall be dry type, double wound, with copper conductor and class B
insulation.
b.
Blocking diodes shall be fully rated and redundant so that failure of a single
diode shall not incapacitate the system in any way.
c.
Isolating switches shall be heavy duty, load break type, operated by an external
handle with provision for padlocking in ON and OFF position.
d.
Changeover switch shall be 3 position, 4 pole, load break type with 2 NO + 2
NC auxiliary contacts.
e.
Contactor shall be air-break type with thermal over load relays having in built
single phase preventor.
f.
Fuses shall be HRC type and arranged for easy replacement. Semiconducting
device fuses shall be fast-acting.
g.
Indicating lights shall be low-watt filament type with series resistor. Both lamp
and lens shall be replaceable from front.
h.
Meters shall be 96 x 96 mm switchboard type, 250 scale, antiglare glass, + 2%
accuracy with zero adjuster on the front.
Alarms
a.
One (1) ten-points alarm facia shall be provided on each charger panel,
compete with proper actuating devices, circuitry and legends.
b.
The arrangement shall be such that on occurance of a fault the corresponding
window will light up and stays lighted until the fault is cleared and reset button is
pressed.
c.
Each time a window lights up, a master relay will get energised to provide group
alarm signals for owner’s remote panel.
7.6.10 Controls
The following manual controls shall be provided on the front of the panel :a.
Selection of float/ equalise/boost charge and auto/manual.
b.
Voltage setters for setting the output of float/equalising/boost charge. Setting
shall be independent of each other so that setting of one voltage shall not
require resetting other.
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Technical Specification
66/11KV GIS Substation
c.
Current limit setter.
d.
Alarm window reset button.
7.6.11 Lamp/Space heaters/receptacles
a.
The charger panels shall be provided with :Internal illumination lamp with door switch.
Space heater with thermostat control.
3 pin 5A receptacle with plug.
b.
Lamp, heater and receptacle circuits shall have individual switch fuse units.
7.6.12 Wiring/Cabling
a.
The panels shall be completely wired-up. All wiring shall be routed through
wiring troughs. Wires shall be ferruled at both ends for identification.
b.
Panels shall have removable gland/plates at the bottom for cable entry. All
incoming/outgoing cables shall be terminated in suitable terminals blocks.
c.
Control terminal blocks shall be box-clamp type ELMEX 10mm2 or approved
equal. 20% spare terminals shall be furnished.
7.6.13 Grounding
a.
The charger panels shall have fully rated ground bus with two ground terminals,
one at each end.
b.
Each terminal shall comprise two-bolt drilling with M10 G.I. bolts and nuts to
receive owner’s ground connection of 50 x 6 mm G.I. flat.
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Technical Specification
66/11KV GIS Substation
ANNEXURE-A
FITTINGS AND ACCESSORIES
1.0
BATTERY
The battery shall be furnished complete with following :-
1.1
First charge of electrolyte plus 10% extra.
1.2
Mild steel racks with 3 coats of anti-alkaline paints.
1.3
Stands insulators 5% extra.
1.4
Cell insulators plus 5% extra.
1.5
Cell interconnectors and end take-off.
1.6
Connection hardware plus 5% extra.
1.7
Cell numbering tag with fixing arrangements.
1.8
Cable clamps with hardware.
1.9
Vent plug plus 5% extra.
1.10
One (1) Interconnector bolt wrench.
1.11
One (1) Hydrometer Syringe.
1.12
One (1) Thermometer with specific gravity correction scale.
1.13
One (1) cell testing voltmeter with leads.
2.0
ALARM
2.1
Each Battery Charger shall be furnsihed complete with one (1) 10-point annunciation
panel. Alarm points shall include :
a.
A.C. supply failure
b.
D.C. Voltage low
c.
D.C. Voltage high
d.
D.C. System ground
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2.2
Technical Specification
66/11KV GIS Substation
e.
Charger overload
f.
SCR fuse blown
g.
Filter fuse blown
h.
D.C. output fuse blown
Alarm contacts shall be rated 0.5A at 220V D.C. and 5 Amp. at 240V A.C.
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Technical Specification
66/11KV GIS Substation
7.7.0 TRANSFORMER
7.7.1
SCOPE :
a)
This specification covers the design, manufacture, assembly and testing at
manufacturer’s works before dispatch, supply and delivery FOR destination as per
requirement of 8/8 MVA 66/11KV Power Transformers.
b)
All drawings, schedules and annexures appended to this specification shall form part of
the specification and supplement the requirements specified. The equipment /
materials offered by the Bidder shall be complete in all respects and whether called for
specifically or not, all accessories, hardware and services required for normal
satisfactory operation of the system shall be deemed to be included in unit rates
quoted. Design and manufacture shall also be such that equipment / accessories of the
same type and rating would be interchangeable.
Specific reference in this specification and documents to any material by trade name,
make or catalogue number shall be constructed as establishing standard of quality and
performance and not as limiting competition. All equipment / accessories offered shall
also be of proven design and manufacture. The make of all accessories and hardware
shall be subject to purchaser’s approval.
7.7.2
CODES & STANDARDS:
All standards, specification and codes of practice referred to herein shall be the latest editions
including all applicable official amendments and revisions as on date of opening of bid. The
following standards and codes shall be applicable.
IS
IS
IS
IS
5
325
335
375
IS
IS
IS
IS
1856
2026 & IEC 76
2099 & 3347
2147
IS
IS
IS
IS
IS
IS
IS
IS
IS
IS
2705
3637
3639
6600 & IEC-354
8468 & IEC-214
5561
617
2629
8478
8603
IS 9434
IS 10028
IS 12676
CBIP
Colour of ready mix paints.
Three phase induction motors.
New insulating oils for transformer.
Marking & arrangement of Switch-gear busbars main connection and
auxiliary wiring.
Code of practice for maintenance of insulation oil.
Specification for Power Transformers.
Bushing for alternating voltages above 1000 volts
Degree of protection provided by enclosures for low voltage switchgear
& controlgear.
Current transformer
Gas operated relay.
Fitting and accessories for Power Transformers
Guide for loading for oil immersed transformers
On load tap charger
Electronic power connectors
Aluminium Alloy grade
Recommended practice for hot dip galvanizing
On load tap changer application guide
Dimensions for porcelain transformer bushings for use in heavily
polluted atmosphere (36 KV and above Class) Dimensions for oil filled
porcelain transformer bushings for use in medium polluted atmosphere.
Guide for sampling and analysis of free and dissolved gas in oil filled
equipment.
Code for practice for selection, installation and maintenance of
transformers
Dimensions for OIP insulated condenser bushings.
Manual on transformer
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Technical Specification
66/11KV GIS Substation
Equipment complying with other internationally accepted standards will also be considered if
these ensure performance and constructional features equivalent or superior to standards
listed above. In such a case, the bidder shall clearly indicate the standards adopted, furnish a
copy in English of the latest revision of standard along with copies of all official amendments
and revisions in force as on date of opening of bid and clearly bring out the salient features for
comparison.
7.7.3
CLIMATIC CONDITIONS:
The transformers are required to operate satisfactorily under the following site conditions:
3.1 Max. Temperature
50 C
3.2 Min. Temperature
2.5 C
3.3 Max. Relative Humidity
100%
3.4 Min. Relative Humidity
26%
3.5 Average number of rainy days per annum
nearly 120 days
3.6 Average annual rainfall
900 m
3.7 Average number of dust storm days per annum
35
3.8 Isoceraunic level
45
3.9 Max. wind pressure
195-kg-sq.m
3.10 Altitude above mean sea level
Less than 1000m
7.7.4
a
TYPE AND RATING
The transformer shall be of two winding, 3-phase oil immersed core type with ONAN/ONAF
cooling suitable for outdoor service as step down transformers.
These transformers shall not be provided with the tertiary delta winding.
The ratings and other characteristics which are not covered elsewhere shall be as detailed in
following clauses
Max Continuous capacity
a)
ONAN
8MVA
b)
ONAF
8MVA
Number of phases
3
Frequency
50Hz
(+5%)
Rated Voltage
a)
HV side
66KV
b)
LV side
11KV
Connections:
a)
HV side
Delta
b)
LV side
Star
Vector group
DYn11
%age Impedence
9-10% at 8MVA base
On load taps on HV side
+5% to -15% in steps of 1.25% each
a)
Insulation level
66KV
11KV
i)
Impulse withstand test voltage
325KV (P)
95KV (P)
ii)
Power frequency withstand voltage 140KV
38KV
rms)
(rms)
b
c
d
e
f
g
h
i
j
k
b)
i)
ii)
l
Insulation level of Bushing
Impulse voltage
Power frequency voltage
325KV (P)
140KV
(rms)
95KV (P)
38KV
(rms)
Creepage Distance
a)
Total
b)
Protected
25mm per kV corresponding to highest system
voltage i.e 72.5kV.
50% of the total creepage distance.
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7.7.5. GENERAL DESIGN OF TRANSFORMER :
a
The transformer and accessories shall be so designed as to facilitate inspection, cleaning and
repairs. The requirement of Indian Electricity Rules shall be kept in view.
b
The design shall ensure satisfactory operation under severe working conditions due to
fluctuating load of steel furnaces and voltage variations in the system including those, due to
short circuits. The transformers shall be designed as to minimize the risk of accidental short
circuits caused by animals, birds or vermin.
The design shall incorporate every reasonable precaution and provision for the safety of all
those concerned in the operation and maintenance of the equipment keeping in the view the
requirement of Indian Electricity Rules.
c
All material used shall be of the best quality and of class most suitable for working under
specified conditions and shall withstand the atmosphere conditions and temperature variations
without undue deterioration or distortion or setting up of undue stress in any part thereof
d
Cast iron shall not be used for any part other than the radiator valve bodies.
e
Corresponding parts liable to replace shall be interchangeable.
f
All taper pins to be used in the mechanism shall be split types as per latest edition of IS 2393.
g
All mechanism should be rust and corrosion proof. Means shall be provided for lubrication of
moving parts not immersed in oil.
h
The construction shall be such as to avoid air or water pockets. Special care shall be
exercised to reduce noise and vibration to the minimum level.
i
Steel bolts of suitable finish will be used for diameters above 6mm brass bolts or studs used
for electrical connection shall not be of less than 6mm diameter. On outdoor equipment all
bolts, nuts & washers in contact with current carrying non-ferrous parts shall be phosphor
bronze.
j
All nuts bolts and pins shall be locked except those which are external to the transformer. If
bolts and nuts are so placed as to be in accessible by means of ordinary spanners, suitable
special spanners shall be provided by the supplier.
k
Labels shall be provided for all apparatus like relays, switches, fuses, etc. housed in matt/
satin finish and permanent lettering. Labels mounted on black surface shall have white letters
& danger notices shall have red lettering on a white background. The labels shall be secured
by means of brass screws or rust protected steel screws.
l
Surface in contact with oil shall not be galvanized or cadmium plated.
m
Before painting, all ungalvanised parts shall be cleaned, made free from rust, scale and
grease and external rought surfaces smoothened (filled with metal deposition). The interior of
the tank and other oil filled chambers shall be cleaned by shot blasting or any other suitable
method.
n
All external surfaces shall be given three coats of paints except for nuts, bolts and washers
which may be given one coat after assembly transformer at works. The final coat shall be
glossy oil and weather proof, non-fading paints of shade 631 of IS:5.
o
The interior of mechanism chambers and kiosks shall be given 3 coats of paint, the final coat
being of light coloured anti-condensation mixture.
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p
The outer most radial spacers of the winding shall be locked in position by means of vertical
strips so that the same cannot fall off/got displaced.
q
Proper & complete tightening of the nuts of the coil clamping bolts must be ensured by the
manufacturers. The nuts of all the coil clamping bolts will be tightened to designed value and
the job be carried out with torque spanners.
The devices used for locking the nuts of coil clamping bolts must be of such a quality and such
care should be taken first in tightening the nuts and next in locking them in position so that the
arrangement does not become loose due to stresses caused by short circuits and fluctuating
loads etc.
r
The noise level shall not be more than 5dB above NEMA standard publication .
s
The transformers shall be designed to have short circuit rating of three seconds as per ISS2026.
7.7.6. INSULATING OIL :
Sufficient insulating oil confirming to IS-335/98 (latest edition) shall be supplied for first filling of
each transformer plus 10% extra oil of total quantity of oil. Particular attention shall be paid to
deliver the oil at site free from moisture and of uniform quality throughout in non-returnable
steel drums. The quantity of oil for first filling of each transformer shall be stated in tender,
along with trademark of the oil to be supplied. Use of inhibitors in oil shall not be resorted to.
7.7.7. LIMIT OF TEMPERATURE RISE :
a
With the above climatic conditions given in clause -3 each transformer shall be capable of
operating continuously on any tap at their normal rating without exceeding the following
temperature rises.
(i)
40 deg. C in oil by thermometer.
(ii)
50 deg. C in winding by resistance.
(iii)
Winding gradient i.e the difference between average winding average oil temperature
not to exceed 13 deg. C.
(iv)
Temperature of hot spot in winding not to exceed 95 deg. C when calculated over max
annual weighted average temperature of 40 deg. C.
b
The limits of temperature rise mentioned above will have to be satisfied by the manufacturer
by carrying out the heat run test at the lowest negative tap. This test shall be carried out by
feeding 1.1 times the total losses at 75 deg. C at highest current tap.
c
OVERLOAD CAPACITY & CONTINUOUS RATING
The safe overload capacity of the transformer and the duration of overload under maximum
temperature conditions without any damage to the winding or harmful effects on the insulation
shall be clearly stated in the tender which must be as per IEC-354/IS6600 guide for loading of
oil immersed transformer.
7.7.8
IMPEDENCE
The transformer shall have 9-10% impedance on 8 MVA base with tolerance as per IS
2026/Part-I (1983). Impedance shall include positive and zero sequence and shall be
expressed in terms of the branches to star connected equivalent diagram, all on the same kVA
base and range shall be given for each branch of the equivalent circuit in turn. The percentage
impedance on normal tap should be 10% and on extreme taps i.e at tap no. 1 it should be
10.3and on tap no. 17 it should be 9.5%. Percentage tolerance allowed at extreme tap be as
applicable to normal tap.
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7.7.9
Technical Specification
66/11KV GIS Substation
FREQUENCY
The transformer shall be suitable for continuous operation with a +5% frequency variation from
a normal of 50Hz. without exceeding the temperature rise as specified in clause 7.1 above.
7.7.10 FLUX DENSITY
a
The primary voltage variation which may effect the flux density at every tap shall be kept in
view while designing the transformer.
b
The transformer should be so designed that the working flux density should not exceed 1.60
Tesla (16000 Lines per sq.cm) at normal voltage frequency at ratio. Tenders with higher flux
density than specified shall not be considered.
The tenderers should indicate the continuous allowable maximum flux density as well as for
time interval of one minute and five seconds. The limit of flux density at which core material
used by them saturates will also be stated in the tender. The name of core material must be
mentioned in the tender. The successful tenderer shall be required to furnish magnetization
curve of the core material, design calculations and such other data / documents deemed fit by
the purchaser for being satisfied that flux density is as desired.
NOTE : The above flux density has been specified to meet with the over fluxing of the core due to
temporary over voltage of the orders of 25% for one minute and 40% for five seconds that may
appear in abnormal conditions such as the one obtained following sudden loss of large loads.
7.7.11. CORE :
a
The cores shall be constructed from the laminations of high grade cold rolled non-aging grain
oriented silicon steel known as M4 High B Grade or superior grad CRGO steels of maximum
0.27mm or low lamination thickness especially suitable for transformer core.
b
The design shall be such as to avoid static discharge short circuit paths within itself or to
earthed clamping devices and production of flux component at right angle to the plane of the
lamination, which may cause local heating.
c
Adequate oil ducts shall be provided in the core for cooling. Tinned copper strip bridging
pieces shall be used for maintaining electrical continuity wherever the magnetic circuit is
provided into pockets by such ducts or insulating material thicker than 0.25mm.
d
There should be no movement of the core assembly relative to the tank during transport as
well as in service due to sudden jerks caused by short circuits and fluctuating loads.
e
Adequate lifting lugs shall be provided to enable core and winding to be lifted.
f
The insulation structure for the core to bolts and core to clamp plate shall be such as to
withstand a voltage of 2000V AC for one minute.
7.7.12. SUPPRESSION OF HARMONICS :
The transformer shall be so designed as to suppress the harmonics voltage specially the 3 rd &
5th to eliminate wave form distortion and interference with communication circuits due to high
frequency disturbances. Percentage of harmonics at normal voltage and at maximum system
voltage shall be stated in the tender.
7.7.13. WINDINGS :
a
The 66kV windings shall have graded insulation whereas all other windings shall be fully
insulated and the neutral points shall be insulated as amended in IS:2026.
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b
The transformers shall be capable of operation without danger on any particular tapping at the
rated KVA when the voltage may vary by + 10% of the voltage corresponding to the tapping.
c
The windings and connections, insulation material shall not soften ooze shrink or collapse
during service.
d
No strip conductor wound on edge shall have a width exceeding six times its thickness. The
conductors shall be transposed at sufficient intervals to minimize eddy currents and equalize
the current and temperature distribution along the windings.
e
The windings and connections shall be properly brazed to withstand shocks during
transportation or transient conditions during service.
f
The adequate pre-shrinkage if the coil assembly using pre-compressed press board material
having low moisture content for the radial spacer blocks shall be ensured by the
manufacturers so that there is no displacement of the radial spacer blocks due to frequent
short circuits on the transformers.
g
All windings after being wound and all fibrous hygroscopic materials used in the construction
of the transformer shall be dried under vacuum and impregnated with hot oil.
In addition to this the drying process be sufficiently extended for proper stabilization of the coil
assembly. More than one cycle of soaking in oil followed by re-tightening of the coil assembly
should be adopted.
h
The coil clamping rings wherever used, shall preferably be of flat insulated steel laminations.
Auxiliary laminated material except bakelised paper shall not be used.
i
The clamping arrangement shall exert equal pressure on all columns of spacers of the
transformer windings built of sections or disc-coils separated by spacers. In no case, spiral
winding will be used either for HV or LV windings.
j
The radial spacer blocks must be made of pre-compressed pressboard material. Which will not
soften while in contact with oil or fray out into fibers or edges. The slots should be so
dimensioned that the blocks will not come out of the slots.
Uniform distribution of coil clamping force shall be designed by using an adequately large
number of coil clamping bolts and by transferring the clamping force from clamping bolts of the
clamping plate through intermediate members which can spread the clamping force over a
large area.
k
All joints shall be brazed / crimped considering the vibrations due to short circuits and load
fluctuations.
7.7.14. CURRENT DENSITY :
The transformer shall be so designed that the current density at any tap should not exceed
250 Amp./cm.sq. in HV and regulating winding and 200 Amp./cm.sq. in LV winding.
The purchaser shall be at liberty to inspect built-up winding for its quality weight of copper,
insulation and overall weight of coil assembly. The size of conductor used for different
windings shall also be checked during stage inspection to check the current density vis-a-vis
guaranteed.
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7.7.15. INTERNAL EARTHING ARRAGEMENTS
a
All metal parts of the transformer except individual core laminations, core bolts and individual
clamping plates shall be maintained at a fixed potential.
b
The earthing connections shall have minimum area of cross-section of 0.8 sq.cm. Except
connections inserted between the laminations and in close terminal connection with them
which may have area of cross section of 0.2 sq.cm.
c
The top main core clamping structure shall be connected to the tank body by a copper strip.
The bottom clamping structure shall be earthed by one or more of the following methods.
By connection through vertical tie-rods to the top structure.
By direct metal-to-metal contact with the tank base maintained by the weight of the core and
windings.
By a connection to the top structure on the same side of the core as the main earth connection
to the tank.
(i)
(ii)
(iii )
d
For magnetic circuit shall be earthed to clamping structure by a link connection from the top
yoke near the bridging pieces referred to in Cl.11.3 in the side of main earth. An inspection
hatch shall be provided over the link in the tank cover.
e
For the individual insulated section of the magnetic circuit separate links shall be provided.
The bridged construction as per C1.11.3 shall not be taken as being or sectional construction.
7.7.16 TANK CONSTRUCTION
a
The tank shall be fabricated of a suitable grade steel and strong enough to allow the lifting of
complete transformer with oil by means of a crane or jacks and transported to site without
over-straining the joints etc.
b
The main tank body shall be capable of withstanding a vacuum of 100.64 KNm2 (760mm of
Hg.).
c
The base shall be so designed as to allow the transformer to be moved by skidding without
any injury.
d
All channeled constructions and stiffeners shall be designed to avoid retention of water.
e
The tank construction shall be free of air pocket. Where such pockets cannot be avoided vent
pipes of 15 mm internal diameter shall be provided to vent gases into the main expansion
pipes. In case of short branch pipes, however, minimum diameter may be taken as 6mm.
f
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 and also, between the cover and the bushings and
all other out-lets to ensure that the joints can be remade satisfactorily at site and with ease by
semi-skilled labour.
g
Suitable lifting lugs for lifting the transformer filled with oil shall be provided on the tank.
h
Four jacking lugs shall be provided to enable the transformer complete with oil to be lifted or
lowered by means of jacks. The lugs shall be fitted at a minimum height (excluding under base
if detachable) of 300mm for transformer upto 10 tones weight and 500mm for transformer
above 10 tones weights.
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i
The transformer shall be provided with detachable steel flanged wheels of 250mm dia and
suitable for moving transformer complete with oil. These shall be bi-directional and mounted
on swivels which may be turned through 90° when the tank is jacked up and capable of being
locked in position paralleled to and at right angle to the longitudinal axis. The wheel be suitable
for standard gauge track of 1676mm.
j
The transformer tank should be designed in such a way that over all length of transformer
does not exceed 7 meters.
7.7.17 TANK COVER
a
The tank cover shall be of bolted type and of adequate strength so as not to distort when lifted.
Suitable inspection cover shall be provided with lifting arrangements to give access to
bushings, winding connections of testing the earth connections. The weight of each inspection
cover shall not exceed 25 Kg.
b
Pockets shall be provided in the position of max. oil temperature at CMR for fitting a
thermometer and for bolts of oil and winding temperature indicators. The thermometer pockets
shall be fitted with a captive screwed cap to prevent ingress of water.
c
Suitable no. of jacking bolts shall be provided on tank cover inspection covers /windows
including OLTC.
7.7.18 CONSERVATOR TANK, OIL GAUGE AND BREATHER
a
An adequate conservator tank complete with sump and drain valves shall be provided in such
a position as not to obstruct the electrical connections to the transformer.
b
If the sump is formed by extending the feed pipe inside the conservator, this extension shall be
atleast 25mm.
c
One end of the conservator shall be bolted type to facilitate cleaning.
d
The conservator shall be provided with a magnetic oil level gauge.
e
The oil connections from the transformer tank to the conservator shall be at rising angle of 3 of
9 degrees to the horizontal upto Buchholz relay. The inside diameter of the pipe shall be
80mm the buchholz relay will have suitable valves on its both side so as to facilitate its testing
at site as well as cut off oil supply to the transformer.
f
The conservator shall be provided with oil preservation system, which should be suitable either
to remove moisture continuously from air entering the air space with which they are connected
or may not allow direct contact of atmospheric air with oil during operation, in addition to silica
gel-breather.
7.7.19 VALVES :
a
The transformers shall be provided with filter valve of 50 mm size mounted on top of the main
tank oil circulations and one drain valve of 80mm size with plug. The conservator shall have
drain plug of 25mm size.
b
Three robust sampling valves with spouts suitable for taking samples of top middle and bottom
oil shall be provided. The top and middle sampling valves shall be brought down by internal
pipe connections. Suitable nameplates shall be affixed to the sampling valves. The sampling
device shall not be fitted on the filter valve.
c
Two - air release plug of 15mm shall be provided.
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d
Plugs shall be supplied for all valves opening to atmosphere.
e
All valves shall be of gun metal and comply with the latest edition of IS:3639.
7.7.20 PRESSURE RELIEF DEVICES :
A suitable pressure relief device of 6” diameter shall be provided on the main tank and of 3”
diameter shall be provided on OLTC for rapid release of any pressure in transformers which
may endanger the equipment. The device(s) shall operate at static pressure less than
hydraulic test pressure for transformer tank of OLTC chamber. If the device is mounted on
tank cover, it shall be fitted with a skirt projecting 25mm inside the tank and of such
construction as to avoid gas accumulation.
In addition to pressure relief device(s) the provision of explosion vent should also be made and
the diaphragm shall be situated above max oil level.
7.7.21 EARHING TERMINAL
Two earthing pads suitable for connecting 50X8mm mild steel flat shall be provided at
positions close to the two diagonally opposite bottom corners of tank. These grounding
terminal shall be suitable for bolted connection. Two earthing terminals shall also be provided
each on marshalling box and any other equipment mounted separately.
7.7.22 JOINTS AND GASKETS :
All gaskets used for making oil tight joints shall be of granulated cork bounded with synthetic
rubber. Metal tops shall be provided for preventing over compression wherever compressible
gaskets are provided.
7.7.23 RATING AND DIAGRAM PLATES :
a
Each transformer shall carry a diagram plate showing internal connections, voltage vector
relationship of different windings, plan view of the transformer showing physical relationship of
the terminals and no load voltage for each tap.
b
Each transformer shall be provided with a rating plate data as specified in IS 2026.
c
IR valves along with oil temperature at the time of testing at manufacturer’s works shall be
indicated on rating plate or separate plate to be provided on transformers.
7.7.24 THERMOSYPHON FILTER ARRANGEMENT
Thermosyphon filter arrangement shall be provided on the transformer for preserving the
quality of Transformer Oil. The filter assembly shall be mounted on the Transformer as well as
ground supported and connected with pipes and shut off valves. Suitable instructions required
to be followed for commissioning dismantlement & maintenance of the filter arrangement, regeneration and storage of the adsorbent etc. must be included in the instruction manual. A
detailed drawing showing internal arrangement shall also be provided to boost circulation of
oil. The pump and motor should not be in main pipe line it should be in bypass pipe line having
suitable valve to isolate from main pipe line. The main pipe line should have two shut off
valves at the bottom.
NOTE :-
The pump and motor should be weather proof (Flow well Type)
The oil & absorbent capacity required in the Thermosyphon Filter is as under.
(i)
(ii)
Quantity of oil
Quantity of absorbent
2.0% of total oil by weight
1.25% of total oil by weight
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7.7.25 COOLING PLANT :
a
Detachable radiators shall be fitted on the main tank with machined flanged outlet and inlet.
Each radiator shall be provided with 19mm drain plug of bottom and 19mm air release plug at
the top. Valves shall be provided on the tank at each point of connection to radiators.
b
In case separate cooler banks are used, they shall be suitable for mounting on a flat concrete
base. These shall be provided with a valve (25mm) at each point of connection to the
transformers tank, removable blanking plates to blank off main oil connection to each cooler.
Thermometer pockets with captive screwed cap at inlet and outlet of each separate cooler,
filter valve at top and bottom and air release plug of 15mm shall be provided.
c
The motor blowers shall be direct driven suitable for continuous outdoor operation and
complete with necessary air dusting. These shall be mounted independently from the radiator
and in case, these are radiator mounting type use shall be made of some anti-vibration means.
Care shall be taken that the lower unit is capable of being removed without disturbing the
radiator structure. The blades shall be suitably painted and shall not be of hollow sections.
Suitably painted wire mesh guards with mesh not greater than 25 mm shall be provided to
prevent accidental contact with the blades.
7.7.26 MOTORS
a
The motor shall be squirrel cage totally enclosed weatherproof type suitable for direct starting
and for continuous running from 415/240 volts, three phase/ single phase 50 Hz. supply. The
motors shall comply with IS as applicable for continuous rated machine.
b
All motors shall be capable of continuous operation at frequency 50Hz. with variation of 5%
and 415/240V AC 10% variation of the normal voltage without injurious over heating.
c
All motors shall have ball or roller bearing with hexagonal nipples for greasing. In case of
vertical spindle, motor shall have bearing capable of withstanding thrust due to weight of the
moving parts.
d
Varnished cambric or glass insulator shall be used for connections from stator winding to the
terminal suitable for external wiring. The motor terminal shall be of stud type and totally
enclosed.
7.7.27 COOLER CONTROL
a
Each motor or group of motors shall be provided with a 3 pole electrically operated contractor
with control gear for motor operation by hand and automatically through winding temperature
indicator. Provision shall be made for over load protection but no volt release coil shall not be
provided.
b
All connection shall be so arranged as to allow either individual or collective operation at the
motors. Alarm indication (audio and visual) for failure of fans and to indicate failure of power
supply shall be provided.
c
The control equipment shall be installed in the marshalling box as specified in CL 23 in a
readily accessible position.
d
The alarm indication for failure of power supply and failure of individual fans be provided
through independent non trip alarm scheme to be wired on the remote tap change control
cubicle conforming to the following :
i)
ii)
The closing of an initiating contact shall actuate a buzzer and will be accompanied by a
flag indication on the concerned auxiliary relay.
The closing of an initiating contact shall glow a lamp, which will not reset until the fault
has been cleared.
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iii)
iv)
v)
vi)
vii)
viii)
Technical Specification
66/11KV GIS Substation
It shall be possible to silence the buzzer by pressing ‘Accept’ push button. If, after
canceling the alarm after canceling the alarm but before resetting the visual signal the
same fault persists the buzzer shall be suppressed.
If after canceling the alarm but before resetting the visual signal some other fault takes
place, the alarm accompanied by flag indication on appropriate auxiliary relay shall
take place.
If after canceling the alarm and after resetting the visual signal, the same fault appears
or some other fault take place, the alarm, flag indication and non-trip-lamp indication
shall re appear as usual.
The non-trip alarm acceptance shall be by means of push button and resetting of visual
signal may also preferably be done through a push button.
Means shall be provided for test checking the lamp and alarm circuit at frequent
intervals.
The equipment shall be suitable for 220 volt DC operation.
Static facia annunciator confirming to the foregoing requirements of non trip alarm
scheme too would be acceptable.
7.7.28 VOLTAGE CONTROL (ON LOAD TYPE)
a
The transformers shall be provided with voltage control equipment of the tap changing type for
varying its effective information ratio while the transformers are on load and without producing
phase displacement.
b
Equipment for ‘local’ and ‘remote’ electrical and ‘local’ manual operation shall be provided and
shall comply with the following conditions. Local / remote switch may be housed in remote
control panel or in tap changer drive mechanism.
(i)
It shall not be possible to operate the electric drive when the manual operating gear in use.
(ii)
It shall not be possible for any two electric controls to be in operation at the same time.
(iii)
The equipment suitable for supervisory control and indication on a multi way switch make
before break having one fixed contact for each tap position, shall be provided and wired to the
tap changer drive gear. This switch shall be provided in addition to any indication shall also be
provided in the form of contacts to close on “Tap change incomplete” condition. All other
components of the supervisory gear if required be specified separately.
(iv)
Operation from the local or remote control switch shall cause one tap movement. The control
switch shall be returned to the ‘neutral’ position between successful operations.
(v)
All electrical control switches on the local operation gear shall be clearly labeled in suitable
manner to indicate the direction of tap changing.
(vi)
The local controls witches shall be mounted in the drive gear housing.
c
The equipment shall be so arranged as to ensure that when a tap change may commenced, it
shall be completed independent to the operation of the control relays of switches. In case of
failure of the auxiliary supply while the tap change is in progress of any other contingency such
as stuck tap changer, adequate means shall be provided to sage guard the transformers and
its auxiliary equipment.
d
Suitable apparatus shall be provided for each transformer to give indications as follows :
(i)
To give indication, mechanically at the transformer and electrically at the remote control
cubicle of the position of tap in use.
(ii)
To give indication at the remote control cubicle that a tap change in progress by means of an
illuminated lamp.
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e
For remote control, the switches, tap position indicator etc. shall be supplied duly mounted on
remote control cubicle.
f
All relays and operating devices shall be operated correctly at any voltage between the limits
specified in the relevant ISS.
g
The tap changing mechanism shall be mounted in the oil tank of compartment mounted in an
accessible position on the transformer.
h
Any non-oil filled component shall be adequately ventilated. Thermostatically controlled
heaters shall be provided in the driving mechanism chamber and in the marshalling box. All
contactor & auxiliary relay coils or other parts shall be suitably protected against corrosion or
deterioration due to condensation fungl etc.
i
The tap changer contacts which are not used for making or breaking current like separate
selector switch contacts inside main transformer tank where tap changer construction permits
such as arrangement. In case of on load tap changer having separate compartment for
selector contacts the oil in such compartment shall be maintained under conservator. Such
pipes connection shall be controlled by suitable valve and shall be arranged so that any gas
leaving the chamber will pass into the gas oil actuated relay. A separate buchholz relay may
be provided for this compartment.
j
It shall not be possible for the oil in these compartments of the tap change equipment which
contain contacts used for making or breaking current to mix with the oil in the compartments
containing contacts and not used for making or breaking current.
k
Any ‘DROP DOWN’ tanks associated with the tap changing apparatus shall be fitted with
guide rods to control the movement during lifting or lowering operations. The guide rods shall
be so designed as to take support of the associated tank when in the fully lowered position
with oil Lifting gear fitted to ‘Drop Down’ tanks shall include suitable device to prevent runaway during lifting & lowering operations. They shall be provided with adequate breathing
arrangement. The tap changer shall be mounted in such a way that the cover of the
transformer can be lifted without removing connections between winding and tap changer.
l
Each compartment in which the oil is not maintained under conservator head shall be provided
with a suitable direct reading oil gauge.
m
The alternating supply for electrical operation of the control and indicating gear shall be
standard 415 volts, three-phase, 3 wire, 50 Hz. along with 240 volts single phase 2 wire 50 Hz.
subject to a variation of + 5% so that the equipment offered can withstand variation in AC.
n
Limit switches shall be provided to prevent over-running of the mechanism and except where
modified in clause 18.15 shall be directly connected in the circuit of the operating motor. In
addition a mechanical stopper or other approved device shall be provided to prevent overrunning of the mechanism under any condition.
o
Limit switches may be connected in the control circuit of the operating motor provided that a
mechanical de-clutching mechanism is incorporated.
p
Thermal devices or other means like motor circuit breakers with shunt trip coil shall be
provided to protect the motor and control circuits. All relays switches, fuses etc. shall be
mounted in the marshalling box or driving gear housing. These shall be clearly marked for
purpose of identification. They shall withstand the vibration associated with tap changer gear
operation.
q
The control circuits shall operate at 220V single phase to be supplied from a transformer
having a ratio of 415 or 240/55-0-55V with the center point earthed through a removable link
mounted in tap changer drive.
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r
The whole of the apparatus shall be of robust design and capable of giving satisfactory service
under conditions to be met in service including frequent operation.
s
A five digit coupler shall be fitted to the tap changing mechanism to indicate the number of
operations completed by the equipment.
t
A permanently legible lubrication chart shall be fitted within the driving mechanism chamber
where applicable.
u
The indigenous make OLTC suitable for 66kV voltage class & current rating 200-300 Amp
should be duly. Type tested from CPRI or other Govt. Test House or reputed lab abroad to the
extent the facilities of Type test available in CPRI.
7.7.29 PARALLEL OPERATION
a
In addition to individual control of tap changer, provision shall be made to enable parallel
operation of the tap changer when one unit is running in parallel with another similar unit of
same rating.
b
Suitable selector switch and controls shall be provided so that any transformer of the group
can at a time be selected as master follower or independent. Arrangement shall be made that
only one of the transformers can be selected as master at a time.
c
An out of step device shall an indicating lamp be provided for each transformer indicating out
of step condition by an indicating lamp and buzzer. It shall be arranged to prevent further tap
changing when transformers in a group operating in parallel control are one tap out of step.
7.7.30 BUSHING INSULATORS AND TERMINALS :
a
Transformer shall be fitted with bushing insulator as follows :
LV Bushing 12kV class oil communicating type porcelain bushing at 2000 Amp rating with
suitable arcing horns.
LV-N Bushing 12kV class oil communicating type porcelain bushing of 2000 Amp rating but
without arcing horns.
HV Bushing 72.5kV class. Condenser bushing at 800 Amp rating with arcing horns.
HV-N Bushing : 72kV class oil communicating type porcelain bushing at 630 Amp rating but
without arcing horns.
b
The characteristics of the bushings shall be in accordance with IS 2099 and IS 3347.
c
The busing insulators except for neutral bushing shall be provided with adjustable arcing horns
and the bidder shall furnish calibration gap to decide actual gap setting.
d
A continuous flexible pull through lead suitably sweated to the end of winding copper shall be
connected to the connector in the helmet of the 66kV Bushing. The bushing may be filled with
oil, which may not be in communication with the oil in transformer.
e
All porcelain shall be free from defects and thoroughly with a smooth, hard and uniform brown
glaze. It should be capable of satisfactory use under the climatic conditions as specified in
clause 3.0.
f
In case of paper insulation care shall be taken to prevent ingress of moisture and a final coat
of non hygroscopic varnish shall be given to them.
g
All clamps and fittings made of malleable iron or steel shall be galvanized as per IS 2629. The
bushing flanges shall not be of re-entrant shape which may trap air.
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h
Technical Specification
66/11KV GIS Substation
Bi-metallic terminal connectors shall be supplied suitable for single ACSR Leopard conductor
(or equ. Size cables) for HV side, LV Neutral. For LV side the terminal connector shall be
suitable for ACSR LEOPARD conductor or equivalent size cables). The take off for HV & LV
connectors will be vertical and for and LV Neutral it should be suitable for horizontal take off.
The connectors shall have six number bolts provided with check nuts & washers. The
connectors shall have rating corresponding to those equipment or higher and shall be
designed most liberally with a higher factor of safety to comply in all respects with
temperatures rise. Resistance tensile strength short circuit withstand capability tests as
specified in IS 5561-1970 or amendment thereof (Latest edition). Aluminum alloy used in the
manufacture of bimetallic connectors shall confirm to designation Grade 4600 of IS : 6171975. The steel bolts, nuts washers and check nuts shall be hot dip galvanized marked with
ISI certification mark or of GKW make.
7.7.31 TEMPERATURE INDICATING DEVICES
a
All transformers shall be provided with a dial type thermometer for indicating oil temperature.
The indicator shall be fitted with a pointer to register maximum temp. recorded and adjustable
set of mercury contact for alarm and trip.
b
In addition, all the transformer shall be provided with a dial type Hot Spot winding temperature
indicator in HV and LV winding. The indicator shall have pointer to register maximum
temperature reached and four sets of adjustable mercury contacts for alarm trip for automatic
control of fans. The static remote repeater (for winding temperature indicator) suitable for flush
mounting shall be installed on remote tap change control cubicle.
c
The temperature indicators shall be housed in marshalling box.
d
The alarm (mercury) contact of WTI & OTI shall be adjustable between 50° C to 100° C where
as their trip (mercury) contacts shall be adjustable between 80° C to 120° C. The temperature
differential between opening & closing of these mercury contacts shall not be more than 10° C.
e
The mercury contacts used for controlling cooling plant motors shall be adjustable to close
between 50° C to 100° C. The temperature differential between opening & closing of this
mercury contacts shall be between 10° C to 15° C.
f
All contacts should be accessible on removal of the cover adjustable to scale it shall also be
possible to move the pointers by hand for checking the operation of contacts and associated
equipment.
g
In addition each transformer shall be provided with a dial type thermometer for indicating the
ambient temperature.
7.7.32 GAS AND OIL ACTUATED RELAYS:
a
The transformer shall be provided with gas and oil actuated relay fitted with alarm and trip
contacts for main tank & a oil surge relay for its OLTC as per IS 3637.
b
Each such relay shall be provided with a test cock to take a flexible connection for checking
relay operation.
c
A machined surface shall be provided on top of checking mounting angles in the pipe cross
level of relay and its setting.
d
The pipe work shall be such as to allow any gas formed in the tank to pass through the relay.
The oil circuit through the relay shall not form a parallel delivery path with any circulating oil
pipe, nor shall be tied into or connected through the pressure relief vent.
e
Adequate clearance between oil pipe work and live metal parts shall be provided.
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7.7.33 MARSHALLING BOX
a
A sheet steel (of 10 SWG size) vermin proof well ventilated and weather proof marshalling box
of suitable construction shall be provided for the transformer auxiliary apparatus. The box shall
have domed or stoping roofs. Ventilation louvers, suitable padded with fell shall also be
provided it shall be painted as per Cl.5.14.
b
The marshalling box shall accommodate temperature indicators. Local electrical control of tap
changer (if same cannot be housed in motor drive housing), control & protection equipment for
cooling plant, terminal boards and gland plates for cables etc. The equipment shall be
mounted on panels and panels wiring shall be done at the back for interconnections.
c
The temperature indicators shall be mounted at about 1600mm from ground level.
d
A metal clad heater with thermostat controlled by a proof rotary switch on the outside of the
both shall be provided.
e
The incoming cables shall enter from the bottom with gland plate not less than 450mm from
the base of the box. Care shall be taken to avoid ingress of water from the cable trench.
7.7.34 CONTROL CONNECTIONS, INSTRUMENTS WIRING, TERMINAL BOARD AND FUSES
a
All cables and wiring shall be suitable for use under the condition as specified in clause 3.0.
Any wiring liable to come in contact with oil shall be of oil resisting insulation. The bare ends of
stranded wire shall be sweated together to prevent oil from creeping along the wire.
b
The instrument and panel wiring shall be run in PVC or non rusting metal cleans of limited
compression type.
c
The box wiring shall be as per relevant ISS. All wiring shall be of stranded copper of 660V
grade and size not less than 4 sq.mm for CT loads and not less than 2.5 sq.mm for other
connections. The panels wires and multi core cable shall bear ferrules of white insulation
material with indelible marking in black and as per relevant ISS. Same ferrule number shall not
be used on wires in different circuits. Double ferrules may be provided where a change in
number is required.
d
Stranded wires shall be terminated with tinned Ross Courtney terminals washers or crimped
tabular lugs. Separate washers shall be used for each wire. Wire shall not be jointed / tied
between terminal points.
e
Where apparatus is mounted on panels all metal cases shall be separately earthed by copper
wire of or strip not less than 2.5 sq.mm. The screens of screened pairs of multi core cables
shall be earthed at one end of the cable only.
f
All terminal boards shall be of stud-type & mounted obliquely towards the rear door and these
boards shall be spaced not less than 100mm apart. Suitable insulation barriers shall be
provided between adjacent connections. No live metal shall be exposed at the back of terminal
boards.
g
All fuses shall be of cartridge type and fuses and links shall be properly labeled. A
7.7.35 LOSSES
The losses of each transformer shall be stated in the tender for ONAF rating (at full load at
75°C) which shall be less than
i.
ii.
No load losses
Load losses
=
=
10.0KW (max.)
60.0KW (max.)
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iii.
iv.
Technical Specification
66/11KV GIS Substation
Auxiliary losses
Total losses
=
=
2.0KW (max.)
72.0KW (max.)
For the purpose of arriving at comparable prices, the iron, copper and auxiliary losses shall be
capitalized as per formula given below :
=IC + 1,52,847.00 Wi + 62,362.00 Wc + 61,139.00Wp
Where Ic
Wi
Wc
Wp
=
=
=
=
Initial cost
Iron (No Load) Losses in KW
Copper (Load) Losses in KW
Auxiliary Losses in KW
Total losses of no load, load & auxiliary losses. In case during testing the losses of
transformers are found on higher side then the quoted, than transformer shall be liable to be
rejected.
7.7.36 TESTS
ROUTINE TESTS
All routine tests shall be carried out on each transformer as per IS-2026/IEC-76.
TYPETEST
Following type test and over load withstand capacity test (as per IEC-354) shall be carried out
on one of units ordered on the successful bidder as per IEC-76/ISS 2026.
i.
ii.
iii.
Temp. rise test (along with DGA test before and after temp. rise test).
Impulse voltage withstand test with chopped impulse on any one phase.
Power drawn by cooling fans / oil pumps as per ISS : 2026.
In addition, the following tests shall be carried out on the transformer tank.
OIL LEAKAGE TEST
All tanks and oil filled compartments shall be tested for oil tightness by being completely filled
with oil of viscosity not greater than that of insulating oil to IS:335 at ambient temperature and
subjected to a pressure equal to normal pressure plus 35KN/M2 (5 lbs / sq.inch) measured at
the base of the tank. This pressure shall be maintained for period not less than 12 hours
during which period no leakage shall occur.
Following tests shall be carried out on each Transformer as reference test.
i.
ii.
iii.
iv.
Measurement of Tan delta and capacitance of T/F winding and bushings at 5KV &
10KV.
Magnetic balance test.
Magnetising current at low voltage.
Measurement of percentage impedance at all taps at low voltage.
TRANSFORMER OIL
The bidder shall indicate in detail facility available at his works for carrying out various tests on
transformer oil as per ISS:335 (Latest) and oxidation stability test as per AS TM:D-1934. It is
contemplated that the oil test as per ISS : 335 shall be carried out on the transformer oil at the
works of the transformer manufacturer before and after pouring of oil. New transformer oil
before pouring in tanks, should conform to values specified in ISS-335/93 and after pouring in
the tank but before energisation. The transformer oil should conform ISS 1866/83 Amendment
No. 1 issued in December 1987.
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Technical Specification
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SHORT CIRCUIT TEST
a) Short circuit test in accordance with clause 16 of ISS-2026 or latest edition shall be got
conducted on one of the units at any test Agencies where facilities exist in the presence of
Purchaser’s representative. However, in case of those manufacturers who have already got
short circuit test in accordance with Cl. 16 of ISS-2026 or latest edition conducted during the
last 5 years on same design and capacity of the Transformer fresh short circuit test is not
required to be conducted. The bidder in such a case shall submit the copy of type test report
along with the bid. If this test is not conducted by the firm earlier then charges for this test shall
be borne by the bidder.
b) The purchaser reserves the right to have any other reasonable test carried out at his expense
either before shipment or at site to ensure that the transformer complies with the requirement
of this specification.
7.7.37 STAGE INSPECTION
The purchaser reserves the right for stage inspection of one or air the transformers at following
stages to ensure that the internal details are in accordance with the data / information supplied
for which the supplier would give 30 days prior notice and the supplier would not go ahead
with further production schedule without obtaining concurrence from the purchaser.
a)
CORE
Bidders will offer the core for inspection and approval by the purchaser during the
manufacturing stage. Bidders call notice for the purpose should be accompanied with
the following documents.
a)
Invoice of supplier
b)
Mills test certificate
c)
Bill landing
d)
Bill of entry certificate to customs
Core material shall be directly procured either from the manufacturer or through their
accredited marketing organization of repute only.
Following tests shall be carried out
i.
ii.
iii.
iv.
b)
Measurement of flux density
No load loss measurement of providing dummy coils at 90%, 100% and 110%
rated voltage and frequency.
Tests on CRGO sample taken from the core shall be carried out for carlite test
(Resistance Measurement) watt loss test, lamination thickness & ageing tests.
Physical inspection for quality of workmanship.
WINDINGS
i.
Measurement of cross-sectional area for current density.
ii.
Measurement of weight of bare copper/cover by resistance methods.
iii.
Test may be carried out on sample of copper for assessing its quality.
c)
i.
TANK
Vacuum Test
One transformer tank out of the lot shall be subjected to vacuum pressure of 100.64kN
(760mm of Hg.) the tanks to be designed for full vacuum shall be tested at an internal
pressure of 3.33 KN/ M2 (25mm of Hg) for one hour.
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Technical Specification
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The permanent deflection of flat plates after the vacuum has been released shall not
exceed the values given below without affecting the performance of transformer.
----------------------------------------------------------------------------------------------------Horizontal length of flat plate (mm)
Permanent deflections (mm)
----------------------------------------------------------------------------------------------------Upto & including 750
5.0
751-1250
6.5
1251-1750
8.0
1751-2000
9.5
2001-2250
11.0
2251-2500
12.5
2501-3000
16.0
Above 3000
19.0
----------------------------------------------------------------------------------------------------ii. Pressure Test
One transformer out of the lot shall be subjected to the pressure corresponding to twice
the normal head of oil or normal pressure plus 35KN/ M2 (which ever is lower)
measured at the base of the tank and maintained for one hour. The permanent
deflection of flat plates after removal of excess pressure shall not exceed the figures
specified as above.
d)
RADIATORS
Radiators shall be routine type tested at sub-supplier’s works as per relevant standard.
Test reports are required to be supplied at the time of final inspection
NOTE
(a)
The insulation resistance values of the transformer windings will be recorded at the
time of carrying out routine tests, for 20 seconds, one minute, two minutes with the help
of 5000V motorized meggar (preferably EVERSHED/AVO & VIGNOLE MAKE). The
polarization index values (ratio of 120/20 sec. value) will be accordingly calculated and
recorded in the test certificates and it should not be less than 1.5.
(b)
Dissolved gas analysis test shall be got carried out before and after heat run test at
CPRI Bangalore.
(c )
Capacitance and Tan Delta values for each transformer and condenser bushings will
be taken and recorded in the test certificates at 5KV & 10KV insulation resistance
value of condenser bushings shall also be recorded.
(d)
Lightening impulse test with the chopped wave applications as per clause 13 of
IS2026/1981 (Part-III) amended upto date. This test will be carried out on one of the
limbs of HV and LV winding with positive polarity.
(e)
The tenderer should clearly indicate the testing facilities available with them and tests
which are to be arranged outside.
Supplier shall submit in-house test certificates at least 15 days in advance for final
testing of T/F for testing T/F all measuring instruments shall be of highest efficiency
and best quality. These shall be got calibrated from NPL/Govt. Agency and be got
sealed by calibrating agency m/s ESIC/PROJECT management consultant reserve the
right to calibrate the instruments in the manner it desires.
Losses shall be measured with 3 watt meter method only. Resistance shall be taken
with Double-Kelvin Bridge. Losses can be measured directly from CTs and PTs and not
through the panel. Ratio of the measuring instrument shall be such that the multiplying
factor is the minimum.
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Technical Specification
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All tests shall be carried out in the presence of the purchaser before dispatching the
material. Test certificates in quadruplicate will be submitted to the purchaser for
approval. No material shall be despatched without prior inspection and approval of test
certificates unless otherwise agreed to. Type and routine test certificates of all bought
out items from recognized testing agency shall be submitted for approval before
commencing supplies OLTC scheme including the master follower functioning shall
also be checked. Only fully assembled transformer including mounting of radiators shall
be put-up for inspection.
7.7.38 DRAWINGS
a
The following drawings shall be supplied as part of the tender.
Outline dimensional drawing of transformer and accessories.
Bushing and terminal connectors drawings.
b
The successful bidder shall submit final version of drawings complete in all respects as
detailed in the following sub-clauses in quadruplicate, within four weeks of placement of order
for Purchaser’s approval. The Purchaser shall communicate his comments / approval on the
drawings to the Supplier within four weeks of their receipt. The manufacturer shall, if
necessary, modify the drawings and resubmit the same for purchaser’s approval within two
weeks of receipt of comments. Such duly revised drawings will be approved by the purchaser
within two weeks of their receipt. After receipt of purchaser’s approval to drwings, the
manufacturer will submit a set of re-producibles of all the approved drawings and will also
supply five sets of all approved drawings and five sets of manual of instructions as per
transformer to M/s BHARTI..
c
Outline general arrangement drawings showing plan, front elevation & side elevation with all
fittings and accessories etc. The following information must be specifically included drawings.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Make of transformer oil.
Electrical clearances, minimum as well as actual.
The no. of radiator headers, number of radiator element in each header.
Small sketch showing un-taking details.
Thickness of transformer tank bottom sides & top plates.
Type shade and shade no. and thickness of transformer paints.
Roller rail gauge sketch.
Weight of oil bare copper weight windings core un-taking mass transportation mass
and dimensions etc.
d
Detailed of bushings shown plan, elevation, terminal details, mounting detail, make and type
number incorporating electrical characteristics, description of various parts, total creepage &
protected creepage distance, weight of oil, total weight of oil bushing dimensions, short time
current rating etc.
e
Drawing showing HV & LV windings with arrangement of insulation and terminal connections.
f
Schematic control and wiring diagram for auxiliary equipment like OLTC control gear, cooler
control gear, marshalling kiosk, detailed write up for schematic shall also be supplied.
g
Combined rating & diagram plate.
h
Valve schedule plate.
i
Core assembly drawing with flux density calculations.
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Technical Specification
66/11KV GIS Substation
j
Interconnection diagram between OLTC panel, drive mechanism and marshalling kiosk.
k
Detailed calculations showing short circuit withstand capacity due to radial and axial forces
during short circuit also calculation for thermal withstand capability during short circuit will be
supplied.
l
Cable arrangement on the transformer.
m
Drawings showing connection of HV, LV lead with the respective bushing and their place of
storage during transportation.
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FITTINGS AND ACCESSORIES
Each transformer shall be complete with the following fittings and accessories :
1.
One 150mm (16”) dial type indicating thermometer (OTI) of robust construction mounted on
the side of the transformer at a convenient height to read the temperature of oil and fitted with
alarm and trip contacts. Provision in the OTI for connection to repeater in RTCC shall also be
provided.
2.
2 Nos. 150mm dial type winding hot spot temperature indicators (WTI) one ach placed in HV &
LV winding, as described below.
It shall be indicating type responsive to the combination of top oil temperature and winding
current calibrated to follow the hot spot temperature of transformer winding. The device shall
have on additional pointer to register the highest temperature reached. Each winding
temperature indicator should have four sets of contacts. Two contacts of one of the WTI shall
be used for trip and alarm purpose, wiring of which will go to the main control and relay panel
of the transformer (External control cables from the marshalling box to the C&R panel to be
provided by the purchaser).
Third set of contacts shall be spare. Provision in the WTI for connection to repeater in RTCC
shall also be provided.
The contacts of each WTI should be adjustable to close between 60° C to 120° C and shall
reopen when the temperature has fallen by 10° C - 15° C. However, supplier should mention in
the their manuals the actual adjustable settings of these contacts.
Repeater for both WTIs shall also be provided in the RTCC Panel.
3.
One conservator alongwith 2 nos. shut off valves, oil surge relay, breather connecting pipe
etc. exclusively for OLTC.
4.
One pressure relief valve / device (PRV) of minimum 6 inch size for main tank and 1 no. PRV
for OLTC of size 3 inch (approx.) with provision for trip contacts.
5.
Inspection covers with jacking bolts in the top cover plate of the tank.
6.
One drain valve with plug or blanking flange at the bottom of the tank size 80mm.
7.
One filter valve each at top & bottom of transformer tank size 50mm.
8.
Three oil sampling valves for taking samples of top middle and bottom oil.
9.
Set of lifting lugs / jacking lugs and eyebolts on all parts for ease of handling.
10.
One double float gas / oil surge detecting (Buchholz) relay in the pipe connecting the
conservator with tank, complete with alarm and tripping contacts to detect accumulation of gas
and sudden changes of oil pressure, complete with shut off valves on conservator side as well
as tank side. The size of shut off valve shall be 80mm.
11.
Two grounding terminals on diagonally opposite bottom corner of tank. However of provided
on the length side of tank, then these grounding terminal shall be our side the rail gauge.
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12.
a.
b.
Technical Specification
66/11KV GIS Substation
One ONAN cooling equipment comprising of suitable radiator with shut off valves, air
release and drain plugs.
One ONAF cooling equipment comprising of fan motors with auto & manual control.
13.
Skids and pulling eyes on both sides.
14.
One marshalling box housing dial type thermometers for winding and oil temperature
indicators, heater, fan , control switches with fan fail alarm and complete wiring and local / auto
selector switch and supply isolating switches with HRC fuses.
15.
Two thermometer pockets for mercury in glass thermometer.
16.
A set of universal type bi-metallic multi-bolt double grooved conductor clamps each capable of
receiving single ACSR Leopard conductor respective for HV side .
17.
Suitable bi-metallic flexible connectors for neutral terminals.
18.
Suitable size bi-directional wheels for preferably 1676mm rail gauge in both direction -4 No.
19.
One OLTC along with remote control panel with each transformer complete with wiring, oil
surge relay etc.
a)
b)
20.
OLTC conservator pipe and valve diameter should be 25mm.
The height of RTCC panel should be appx 2200mm & shade of paint should be of 631
of IS:5.
The following plates in English shall be fixed to the transformer tank at about 1750mm above
ground level :
a)
b)
c)
Rating Plate bearing data as specified in IS:2026/1977. It must contain insulation levels
of various windings, impedance at tap 1/5/17 & short circuit duration.
Terminal marking plate showing the internal connections and voltage vector
relationship of various windings in accordance with IS : 2026/1977 (Latest Edition).
Valve schedule plate showing the location and function of all valves and air release
cocks/ plugs.
21.
A plate showing the rated no load voltage at various taps shall be affixed on the RTCC in order
to facilitate the operator in deciding the tap position on which the transformer is to be operated
corresponding to the incoming voltage.
22.
Oil conservator air cell type (for main tank) fitted with flexible separator (as oil preservative
system) complete with magnetic type oil gauge, filling hole and cap, drain valve-size 19mm,
shut off valve, inter connecting pipes etc. Magnetic type oil level gauge shall be provided with
low oil level alarm contacts and a dial showing minimum, maximum and normal oil level. The
gauge shall be readable from the transformer base level. Silica gel breather with oil seal, shall
be fitted as already prescribed. Breather should be made of see through material. One drain
pipe upto floor level with one valve may be provided.
23.
One no. ladder with provision for anti-climbing.
24.
Any other item which is not included above but it is essential for the satisfactory operation of
the equipment.
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7.8.0
Technical Specification
66/11KV GIS Substation
EARTHING SYSTEM
The earthing system shall comprise system earthing and equipment earthing. The
vendor shall design detailed grid design of earthing for switchyard and he should
measure earth resistivity at site and during detailed engineering he should submit
calculation for maximum touch potential and step potential.
7.8.1
a)
Equipment Earthing
The main objective of Equipment earthing are :
i)
Provide safety to personnel from contact of dangerous potential caused by earth
fault.
ii)
Ensure sufficient earth current for effective relaying.
iii)
Stabilize circuit potential with respect to earth.
b)
In order to meet the above objectives a earth grid will be provided encircling the plant
through a system of earthing electrodes / pits consisting of interconnected bare earth
conductors buried in the earth and such earth grid will have provision for connection
with the other earth grids of the plant complex to achieve common earth for electrical
devices/metallic structures.
c)
All electrical equipments, non-current carrying metal parts, storage tanks, structural
building steel, lightning protection system. Cable shields etc. as required for safe &
trouble free operation and to meet the statutory requirements will be connected to this
station earth grid.
d)
7.8.2
Neutrals of transformer will be connected to dedicated neutral pits and net resistance for
neutral conductor shall be less than 1 ohm.
Design Criteria
Two main aspects considered in the design of an effective ground grid are :
7.8.3
a)
To keep earth resistance of the grid as low as possible. (less than 1 ohm).
b)
To achieve earth surface potential as uniform as possible under fault condition.
Above Ground Connections
a)
Galvanised steel flats shall be recommended for all connections above earth in
view of its excellent atmospheric corrosion resistant properties.
b)
Inside building, earth conductors will be run for each floor supports on building
steel and/or cable trays. These ground conductors in turn will be connected to
the station earth grid through riser (at least two) coming up along building
columns/cable shafts.
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7.8.4
Technical Specification
66/11KV GIS Substation
c)
Two separate and distinct earth connections will be provided for each electrical
equipment in compliance with I.E. rules.
d)
All connections above earth will be welded type except connection to
equipments/structures which shall be bolted type.
Equipment earth Lead
Equipment earth connections will be sized to carry the available earth fault current.
Consideration shall also be given to mechanical ruggedness of the connections and to
limit the sizes.
7.8.5
Electronic earthing System
The main purpose of electronic earthing system is to protect sensitive electronic like
computer PLC, DCS, UPS etc. A low noise, isolated earth system shall be provided for
earthing of sensitive electronic equipment. The system shall consist of insulated earth
conductor connected to the isolated earth electrodes at one point which in turn
connected to main earth mat.
7.8.6
Lightning Protection
The main purpose of lightning protection system are :
a)
b)
Provide protection to structures from lightning strokes.
Provide a low resistance conducting path to lightning discharge.
7.8.7
Lightning protection is recommended for main plant building and other structure.
7.8.8
For metal structures which are continuous down to the ground level, no lightning
protection is required except adequate grounding connections.
7.8.10 SYSTEM DESIGN
a)
Air termination network with down conductors and earthing electrodes will be
provided on the basis of IS recommendations.
b)
Horizontal air termination shall be so laid out that no part of the roof will be more
than 9 metres from the nearest conductor.
c)
Shielding angle for one vertical air termination shall be 30 degrees. For more
than one rod, shielding angle between the rods shall be taken as 45 degrees.
d)
Down conductors will run along the outer surfaces of the building and shall have
a test joint about 1500 mm above ground.
e)
An earth electrode will be provided at the
conductor with the station ground.
f)
Galvanised steel rods and flats will be generally used for air termination and
connection. All connections will be welded type. Every galvanising flat which
will undergo welding will be painted by two coats of cold galvanising paint.
connection
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7.8.10 Following minimum earthing conductor sizes shall be used for equipment earthing:
Sl.
No.
1
2
Equipment
3
Transformer
Control panels & control
desks etc
System neutrals
4
Cable trays
5
Steel columns
6
Rails, fence & gates
Earthing conductor size
75mm X 8/10mm MS Flat
75mm X 8/10mm MS Flat or as per
calculation
2X 1C X 300 mm.sq copper cable or
75mm X 8/10mm MS Flat
75mm X 8/10mm MS Flat or as per
calculation
75mm X 8/10mm MS Flat or as per
calculation
75mm X 8/10mm MS Flat or as per
calculation
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7.9.0
STATION LIGHTING SYSTEM
7.9.1
The system provides lighting and service power to the switchyard areas. In addition, it
supplies lighting to selected areas in plant emergency condition. The reliability shall be
achieved by feeding from various sources such as AC Normal, AC Emergency and DC
Emergency.
i)
Normal A.C. Lighting
ii)
a)
This will be provided by lighting fixtures distributed throughout the switchyard.
These lights will be ON as long as normal A.C. supply is available.
b)
Lighting fixtures will be fed from respective area lighting panels which in turn will
be connected to the main lighting distribution board. The main lighting
distribution board will be fed from the 415v switchyard DB.
Emergency AC Lighting
Emergency AC Lighting shall be provided and fed from Emergency LDB. These
Lighting fixtures shall be normally ON along with AC normal system. The fixtures shall
be located at strategic places and the quantity of these fixtures shall be about 10% to
15% of normal A.C lighting fixtures.
iii)
7.9.2
Emergency DC Lighting
a)
Emergency lighting will be provided at critical operating location and emergency
exits fed through 220 V DC system or separate inverter.
b)
Emergency lighting system shall be separated in every way from the normal
lighting system and supplied from the 220 V DC emergency distribution panel or
separate inverter and subject to change over to emergency supply in the event
of normal power outage.
c)
For remote locations emergency D.C. lighting, if required, will be provided
by self contained battery/charger which will be energised on loss of normal
A.C.supply.
Illumination Level
Recommended illumination levels for different areas given below.
7.9.3
Lighting & Power Panel
a)
Lighting and Power Panels shall be fed from LDB/Auxiliary Service boards.
These panels shall be provided with miniature circuit breakers (MCB) or
switches and fuse combination for control and protection of different
outgoing circuits.
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7.9.4
7.9.5
b)
The panels shall be housed in safe areas, wherever felt necessary distribution
box can also be used in place of lighting panel for lighting circuit tappings.
c)
Lighting & Power panels shall be complete with necessary instrument, control
and indication. Number of outgoing circuit of lighting panels shall be as far as
possible standardised to keep minimum inventory.
Lighting Fixtures
a)
Lighting fixtures are selected to suit the ambient conditions, mounting
height and special requirements such as aviation warning, Street lighting etc.
b)
Type of lighting fixtures envisaged for various areas are given in Annexure-B.
Receptacles
a)
7.9.6
Technical Specification
66/11KV GIS Substation
The type of receptacles proposed for the plant are also given below. These will
be suitably distributed throughout the plant to meet the requirement.
Cable/Wiring
a)
Connections from main lighting distribution boards to area lighting panels will be
through cables.
b)
Connection from area lighting panels to the fixture will be by 650/1100 Volts
Stranded Conductor, PVC insulated wires through rigid steel conduits.
c)
The minimum sizes shall be limited as follows:
Aluminium Conductor : 16 Sq.mm
d)
7.9.7
Copper Conductor
: 2.5Sq.mm
Conduits
: 25 mm
Connection for roads and outdoor areas will be through directly buried cables,
having aluminum conductor, XLPE insulated, extruded PVC inner sheath, round
steel wire armoured, extruded PVC outer sheath.
Street Lighting/Area Lighting
Street lighting shall be carried out by 150/70 W HPSV fixture. Height of the pole shall
depend upon width of the road. Switchyard area shall be illuminated by providing flood
light on gantry tower using HPSV fixtures.
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ANNEXURE-A
LEVEL OF ILLUMINATION
Illumination Level (LUX)
1.
Switchgear, Battery, Electronic
equipment rooms, Rotating
machinery & Adjoining areas
2.
Battery room, General Indoor area
3.
Cable/Pipe Tunnel, Cable spreader
:
200
:
200
Passages, Stairs Catwalks,
4.
Toilets, etc
:
100
Switchyard
:
30- 50
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ANNEXURE-B
TYPE OF FIXTURES
SL.NO.
1.
AREA
Control room
DESCRIPTION
Decorative Fluorescent
Fixture / T5
2.
Switchgear room
Industrial Fluorescent
fixture / FTL / T5
3.
Battery room
Corrosion Proof
Industrial Fluorescent
4.
Near Local Panel
Industrial Fluorescent
(2 x 36 W FTL or equivalent T5)
5.
External Lighting
150/70 WHPSV street lighting
fixture mounted on poles.
6.
Emergency DC
7.
Transformer Bay
8.
Area Lighting
Incandescent Lamps
70 /150 W HPSV street
lighting fixture
250 W HPS lighting fixture
mounted on lighting pole.
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ANNEXURE-C
TYPE OF RECEPTACLES
Sl. No.
1.
Description
5A, 240V, 2 Pole, 3 Pin with third pin
earthed suitable for flush mounting in
office areas and control room. The
switch shall be also flush mounting
type.
2.
15A, 240V, 2 Pole, 3 Pin with third pin
earthed, Wall/Column mounted, metal clad
gasketed construction 25 mm conduitentry. Screwed metal cover tied to it by
a metal chain weatherproof suitable for
indoor/outdoor installation.
3.
63A, 415V, 3 Phase, 5 Pin interlocked
plug and switch with fifth pin earthed,
Wall/Column mounted, metal clad gasketed
construction weatherproof, suitable for
loop in loop out connection of 4/C-4/6
sq.mm cable. These shall be fed
from A.C. Distribution board
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7.10.0 TESTS, INSPECTION OF SWITCHYRAD EQUIPMENTS
7.10.1 Shop tests shall include all tests to be carried out at Contractor's work, and works of his
sub-contractor. The tests to be carried out shall include but not being limited to the
tests as listed in clause below:
A
66 kV CIRCUIT BREAKERS
Routine Tests
Routine test as per IEC-56 shall be performed on all GIS circuit breakers. In addition to
the mechnical and electrical test specified by IEC, the following shall also be performed.
Speed curves of each breaker shall be obtained with the help of a suitable operation
Analyser to determine the breaker contact movement during opening, closing auto
reclosing and trip free operation under normal as well as limiting operating conditions
(Control Voltages, Pneumatic Pressure etc.) The tests shall show the speed of contacts
directly at various stages of operation, travel of contacts, opening time, closing time,
shortest time between separation and meeting of contacts at break-make operation etc.
Type Tests
Type test as per IEC-56 shall be performed on one breaker of each type. The following
additional type tests are also to be conducted.
i)
ii)
iii)
iv)
Corona extinction voltage test.
Out of phase closing test.
Line charging, interrupting current for proving parameters.
Seismic withstand test.
If type tests on similar equipment have already been carried out, type test certificate
should be submitted.
B.
66 kV DISCONNECTING SWITCHES
Routine Tests
During manufacture and on completion, all equipment shall be subjected to the Routine
Tests as laid down in Indian Standard or IEC.
Type Tests
Type tests shall be carried out on one sample equipment as per IS/IEC.
The following additional type tests are also proposed to be conducted.
i)
ii)
iii)
Radio interference voltage test.
Corona extinction voltage test
Seismic withstand test.
If type tests have been carried out on similar equipments, then type test certificates
should be submitted.
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C.
Technical Specification
66/11KV GIS Substation
66 kV CURRENT TRANSFORMERS
Routine Tests
During manufacture and on completion, all equipment shall be subjected to the Routine
Tests as laid down in IS/IEC.
The current transformer shall be subject to the following routine tests in addition to
routine tests as per IS/IEC.
i)
ii)
iii)
Partial discharge test.
High voltage power frequency test on secondary winding.
Over-voltage inter-turn test
Type Test
The following additional type tests are also proposed to be conducted on each type &
ratio of current transformer along with other type tests as per IS/IEC.
i)
ii)
iii)
Radio interference test
Transient response test
Seismic withstand test.
If type tests of similar equipment have been carried out the type tests certificate should
be submitted.
D.
66 kV POTENTIAL TRANSFORMERS
Routine Tests
a)
During manufacture and on completion, all equipment shall be subjected to
the Routine Tests as laid down in Indian Standard. IS : 3156
b)
The following type tests are also proposed to be conducted.
i)
ii)
iii)
iv)
High frequency & equivalent series resistance measurement.
Seismic withstand test.
Radio interference test.
Sealing test.
If type tests have been carried out on similar equipment then type test certificates shall
be submitted.
E.
66 kV SURGE ARRESTERS
In accordance with the requirements the surge arresters shall conform to type tests and
shall be subjected to routine and acceptance tests as per IEC-99 and IEC-TC37-WG4.
The following additional type tests are proposed to be conducted alongwith other type
tests as per IEC-99 and IEC-TC37-WG4 in the relevant schedule.
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i) Radio interference voltage test.
ii) Seismic withstand test.
iii) Contamination test.
iv) Dynamic over voltage withstand test (procedure to be mutually agreed).
If type tests have been carried out on similar equipment, then refer test certificates
should be submitted.
F.
66 kV CONTROL & RELAY PANEL
Each Control Board shall be completely assembled, wired, adjusted and tested at the
factory prior to shipment.
Routine Tests
The tests shall include wiring continuity tests, insulation tests and functional tests to
ensure operation of the control/ protection/metering schemes and individual equipment.
All switches, meters, relays and other devices shall be tested and calibrated in
accordance with relevant IS standards.
Type Tests :
I) Verification of degree of protection of Control, Relay & Metering Panel as per IS: 2147.
ii) High Frequency Disturbance test & Impulse test on principal static relays of each type.
iii) Environmental tests such as coldtest.drytest,damptest,rigid temperature cycling,
vibration and bumptest as per IS:9000 to be carried out on all electronic equipment
like static relays etc.
verification of type test certificates shall be done in case same is carried out for the same
type/model, else type test to conducted.
7.10.2 SWITCHYARD HARDWARES
The equipments shall be subjected to type sample and routine tests as per relevant IS.
Tests in respect of conductor and steel wire accessories shall include but not limited to
the following tests :
a)
b)
c)
d)
e)
Failing load test.
Resistance test.
Heating cycle test.
Galvanising test.
Wrapping test for Aluminium binding wire and tape.
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7.10.3 ACDB/DCDB
Routine Test
The tests shall include but not necessarily limited to the following :a.
Operation under simulated service condition to ensure accuracy of wiring,
correctness of control scheme and proper functioning of the equipment.
b.
All wiring and current carrying part shall be given appropriate High Voltage
Test.
c.
Routine Test shall be carried out on all equipment such as switchfuse,
contactor, timers etc.
7.10.4 CABLES
The cables shall be subject to shop tests in accordance with relevant standards to prove
the design and general qualities of the Cables as below :
Routine tests on each drum of cables.
Acceptance tests on drums chosen at random for acceptance of the lot.
Type tests on each type of cable, inclusive of measurement of armour D.C. resistance of
power cables.
Additional Tests
To prove the fire resistant characteristics, each type of cable shall also be subject to the
following additional type tests at works :
Oxygen index test as per ASTM D2863. Minimum value of Oxygen index shall be 30.
Flamability tests on finished cable as per the requirements of IEEE-383, IEC-332-1 and
Swedish standard SS 4241475 clause F3.
Smoke generation by outer sheath under fire as per ASTM D 2843. The cables shall meet
the requirements of light transmission of minimum 40% after the test.
Acid gas generation by outer sheath under fire as per IEC-754-1 and the minimum Acid
gas generation shall be less than 20% by weight.
7.10.5 Battery & Charger
Shop Tests
All equipment and component thereof shall be subject to shop tests as per elevant IS
standards. The tests shall included but not limited to :Type tests on two cells of each battery.
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Tests on battery charger and DC/DC converter.
a.
b.
c.
d.
Dielectric tests.
Voltage regulation check from 0 to 10% load with + input voltage
Ripple content measurement.
Heat run test on current limiting value.
variation.
7.10.6 TRANSFORMER
Routine Tests
During manufacture and on completion, all transformers shall be subjected to the
routine tests in accordance with latest IEC 60076 and its different parts.
In addition, the following tests shall be performed on each transformer:
a
Transformer tank with coolers shall be tested for leaks with normal head of oil plus 35
KN/m2 for a period of 8 hours. If any leak occurs, the test shall be conducted again
after all leaks have been repaired.
b
During fabrication stage, the tank shall be pressure tested with air at a pressure
corresponding to twice the normal head of oil or normal pressure plus 35KN/m2
whichever is lower for a period of one hour. Also the tank designed for full vacuum
shall be tested for maximum internal pressure of 3.33KN/m2 for one hour. The
permanent deflection of flat plates shall not exceed CBIP specified figures on release
of excess pressure of pressure test and on release of vacuum.
c
After assembly, each core shall be pressure tested for one minute at 2KV (r.m.s.) A.C.
between all bolts, side plates, structural steel works and the core.
d
The wiring for auxiliary power and control circuitry shall be subjected to withstand one
minute power frequency test with 2.0KV (r.m.s.) to earth
e
Dielectric special tests as per IEC60076-3
f
Determination of capacitances windings-to-earth and between windings
g
Frequency Response Analysis test (This test shall also be undertaken by the
manufacturer at site after transformer is installed.)
h
Measurement of acoustic sound level
I
Measurement of power consumption of fans
j
Measurement of zero sequence impedance(s) on three-phase unit
k
Measurement of dissipation factor (tan delta) of insulation system capacitances
l
Type Tests
Following type tests shall be performed on one transformer in accordance with relevant
standard:
a.
b.
Dielectric type test (IEC60076-3)
Temperature rise test.
Cost of such tests, if extra, shall be quoted separately by the Bidder.
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m
Technical Specification
66/11KV GIS Substation
Miscellaneous
All component parts and auxiliary equipment such as oil, bushings, C.Ts etc.shall be
routine tested as per relevant Indian Standards.
7.10.7 NEUTRAL GROUNDING RESISTOR
Routine Tests
Each equipment shall be completely assembled, wired, adjusted and routine tested as
per relevant standards at manufacturer's works. The tests shall include :
a
b
c
d
e
Resistance measurement
Voltage measurement
Insulation resistance measurement
Dielectric test
Type Test
Temperature test ( on one unit of each rating)
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8.0
DRAWINGS, DATA AND MANUALS
8.1
General
Bidder shall make all arrangement and design drawings to suit his equipment
and submit the same for approval to the engineer / consultants. Detailed
engineering shall be done by the Bidder.
8.2
Drawings/Documents to be submitted along with the Offer/ Tender:
a)
The following drawings and detailed document shall be furnished along
wi th the tender, without which the tender shall be deemed to be
incomplete and liable for rejection.
b)
Schedule – 4:- “Technical Data” duly filled in along with the offer. Data
against all items shall be explicitly indicated. Technical Deviations, if any,
from the specification requirement as mentioned above shall be clearly
tabulated clause by clause indicating justification. If no technical deviation
is expressed in “Schedule -9, statement of Deviations”, it will be deemed
that the tenderer is agreeable to all the stipulations of this specification.
c) Dimensional General Arrangement Drawing along with the weight of
each type of H.T. system / switchgear / equipment offered. List of spares
included in the offer.
8.3
After Award of Contact:
After Award of the contract, the Bidder shall submit the following drawings!
document for Engineer’s approval:
a)
Detailed dimensional general arrangement drawing, foundation plan and
loading details of all H.T. switchgear and equipments as per final
requirement of the project. They have to submit detailed fault level
calculation along with earth resistivity value, touch potential calculation,
step potential calculation and HT switchgear relay settings along with graph
for discrimination.
b)
Detailed typical internal arrangement of the 66 and 11 KV cable box
showing cable terminations.
c)
Final Equipment schedule of the H.T. equipments indicating the type,
make and rating of these equipment.
d)
Control schemes and internal wiring diagram.
e)
Erection and Commissioning instruction manuals in 6 (six) sets.
f)
Operation and maintenance manuals in 6 (six) sets.
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g)
8.4
Technical Specification
66/11KV GIS Substation
Any other technical information / data (whether specifically mentioned
above or not) shall be furnished as per requirement of the Employer/
Engineer.
Design Calculations
The design calculations shall be written in English language, computer print
outs of only the results of analysis will not be accepted in lieu of written design
calculations.
8.5
Programme of Submission
Within two weeks of receipt of Letter of Acceptance by the Bidder, he shall
specify the stages at which the designs/drawings for various system/items will
be submitted.
8.6
Approval by the Employer/Employer’s Representative
The Employer/Employer’s Representative will signify his approval or otherwise
to the submission under sub-clauses above within 15 days of receipt of such
submissions. If the Employer/Employer’s Representative will not approve any
drawing/design so provided, the same shall be forthwith modified to meet the
requirements of the Employer/Employer’s Representative and shall be
resubmitted. Approved drawings will be signed or otherwise identified by the
Employer/Employer’s Representative. The time frame for checking of
designs/drawings by the Employer/Employer’s Representative will apply only if
the submission schedule is strictly adhered to.
8.7
Inspection of Drawings at Site
The Engineer shall have the right at all reasonable times to inspect at the
premises of the Bidder all drawings or call for any drawing to be given to
Engineer's office.
8.8
Supply of Design Data for other Bidders
The Bidder shall supply all relevant design data such as foundation fixing
details, etc. in respect of items which are to be erected by this Bidder on
structures executed by other Bidders within 45 days from the date of receipt of
letter of acceptance. This para shall be read in conjunction with Section 4
"Works Not Included" of this volume.
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8.9
Manuals and Technical Data
8.9.1
Manuals
The Bidder shall supply one complete of operating and maintenance
manuals prior to the starting of erection. Recommendations of the
manufacturer in respect of preventive maintenance, breakdown maintenance
and over haul shall be brought out in the operating and maintenance manuals.
a)
b)
The manuals shall contain descriptions, illustrations, sketches,
drawings, sectional arrangement views and maker's part numbers to
enable the connections and functions of all components of the
equipment to be easily followed and for all parts to be easily identified to
facilitate the ordering of replacements. Exploded views where
appropriate shall be used for clarity.
The manuals shall also include the following:
i)
ii)
iii)
iv)
v)
vi)
8.9.2
Technical data of the equipment and its performance.
Instructions for servicing and overhaul.
Spare parts list with makers parts numbers.
Details and results of tests carried out on equipment.
Co-ordination curves for protective devices at the set values made
at site.
Assembly drawings.
Technical Data
On completion of the works and before taking-over by the Employer, the
Bidder shall supply one complete set on polyester :
A)
List of recommended spare parts.
B)
Shop drawings of all wearing parts and also major assemblies and
minor assemblies which require unit replacement.
C)
Complete technical data and dimensional drawings of all bought out
product items.
D)
Parts catalog in the case of all equipment/assemblies illustrated with
part Nos. in drawings both for electrical and mechanical items.
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9.0
INSPECTION AND TESTING
9.1
The Employer/Engineer or his representative shall inspect the materials and
wo rk man ship as whe n and where it s eems to him mo st expe dient
and to thi s end the Empl oyer/Engineer shal l hav e ac ce ss at all
ti mes to the work and to all places where materials are stored or
being transported. The supplier shall furnish the Employer/Enginee r
with any labour and facilities required to carry out such inspection.
9.2
In case of sub-letting to other Contractors or Manufacturers by the Suppliers,
the Engineer will reserve the right as follows:
A)
That, inspection and/or testing will be carried out at the manufacturer's
works.
B)
Or tha t, i nspe ction wi l l be c arri ed out a t si te b y the Engi neer
or hi s Representative.
C)
Or that, inspection wi ll be waiv ed subject to the supplier
furnishing a test certificate of compliance with specification by the
Inspection Departments of supplier's works.
D)
Or that, no inspection or test certificate is required.
9.3
The Contractor shall notify the Engineer the dates on which item of standard
manufacture will be available for inspection and/or ready for despatch.
The Contractor shall allow reasonable ti me for the Engineer to make
arrangements for inspection or give permission for despatch as the case may
be.
9.4
Beside the tests called for under the clauses herein, the Engineer shall have
authori ty to order independent tests on any material to be carried out
as he deems fit at the supplier's expense.
9.5
Not withstanding the fact that equipment has passed the inspection carried out
d u ri n g t h e s t a g e o f ma n u f a c t u r e , t h e s u p p l i e r i s n o t r e l i e v e d
f r o m h i s obligations to conform to the quali ty, work manshi p,
guarantee of performance etc. as per the relevant terms of this contact.
9.6
Any defective material, equipment or workmanship which may come to the
notice of the Engineer or his representative after erection and
installation shall be li able for rejection, and the suppli er shall have to
replace such materials, equipment etc. or rectify the defects at his own cost.
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9.7
Technical Specification
66/11KV GIS Substation
The Engineer or his Representative will conduct from time to time such
tests as may be requi red on an y part of the equi pment to determine
i f it is installed in accordance with specification. The supplier shall
extend to the Engineer all facilities to this end and shall furnish skilled and/or
unskilled help as required.
All tests shall be witnessed by the Engineer or his Representative and four
(4) copies of the verified test results be given to the Engineer on
completion of a test. After installation, all circuits ;and equipment shall
be tested by the supplier for grounds, short circuits and proper operation.
9.8
Visual Inspection
a)
General and mounting arrangement as per approved drawing.
b)
Dimensional Check.
c) General workmanship, finish and painting and provision of component as
specified.
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Technical Specification
66/11KV GIS Substation
10.0
MATERIALS AND SUBSTITUTION
10.1
All items not specifically mentioned herein, but which are obviously
necessary to make a complete supply within the scope of the work, shall be
provided, including any necessary field engineering and/or detailed drawings
required.
10.2
It shall be the Bidder's responsibility to schedule and coordinate his work
in order to av oi d undue i nte rfe re nce, cong esti on and delays i n
construction/supply.
10.3
All equipment and materials shall be of the best quality and most suitable
for the conditions or climate and area classification. These shall be such that
they shall withstand without damage, any conditions arising from short circuits,
switching operations and sudden variations of load and voltage as may be met
with under normal working conditions.
10.4
All the material supplied by the Supplier/Bidder shall be inherently rust
resistant or shall be suitably protected by epoxy base paint or any alternative
method approved by the Engineer.
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66/11KV GIS Substation
MAKES OF VARIOUS EQUIPMENT
NOTES:
1.
It is the responsibility of the contractor to meet all technical requirements of this specification
whether the same are covered with standard product of above manufacturers or not. Any
specific deviation shall be listed under “Deviation” with the offer.
2.
The vendor shall clearly identify the make/s offered by them in their offer by encircling the
same.
3.
The makes are to be frozen during finalization of order. Further, there shall not be any change
in makes after finalization without written approval of owner / consultant.
4.
In the event the material or equipment of makes called for are not available and alternative
makes are approved for incorporation in the work, the rate quoted shall be suitably amended
based on the price variation between the specified makes and as per tender the alternative
makes on the day alternative makes are accepted.
1.
66 KV GIS
:
ABB / AREVA / SIEMENS/DELEX
2.
66 KV AIR BREAK ISOLATOR
:
S & S / G R POWER / PR KOLKATTA
3.
66 KV CTs/ VTs
:
MEHRU /CGL/VISHAL
4.
66KV LIGHTNING ARRESTER
:
ELPRO / OBLAM / HYVAR
5.
66KV INSULATOR (POST
DISC).
:
BIRLA NGK (J&I) / MODERN / WS /
SARAVANA INSULATORS
6.
66KV RELAY CONTROL PANEL
:
AREVA / ABB / SIEMENS / TRICOLITE // AMBIT
7.
11KV HT / LT CABLES
:
CCI / POLYCAB/ RPG / FINOLEX / KEII
8.
BATTERY & BATTERY CHARGER :
CADLINE / DUBAS / HBL / AMARRAJA / EXIDE
9.
11KV SWITCHGEAR
SIEMENS / CROMPTON / KIRLOSKAR / ABB /
AREVA / TRICOLITE/UBITECH
10.
66KV /11 KV SYSTEM NUMERICAL
PROTECTION RELAYS
:
:
AREVA / ABB / SIEMENS/WOODWARD
11.
NEUTRAL GROUNDING RESISTOR :
LACCHMAN ELECTRONICS
NARKHEDE / RESITECH KOLKATTA
12.
SWITCHES
:
KAYCEE/ L&T / SIEMENS / GE / VAISHNO /
SALZER
13.
DIGITAL METERS
:
CONZERV / SECURE / DIRIS
14.
SEMAPHORE INDICATOR
:
AREVA/ABB
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Technical Specification
66/11KV GIS Substation
15.
TERMINAL
:
WAGGO/ ELMEX
16.
ANNUNCIATOR
:
MINILEC/ PROTON
17.
EHV CABLE 66KV
:
CCI / UNIVERSAL /KEI / LS CABLE
18.
a)
HT TERMINAL KITS
11KV
:
3M / RAYCHEM
66KV PREMOULDED
PORCELAIN TYPE
:
ABBKABLEDON/RAYCHEM
CABLE
b)
19.
66KV POWER TRANSFORMER
:
VOLTAMP / CGL / GE / EMCO
20.
STATION TRANSFORMER 11KV
:
ABB
/
CRMPTON
VOLTAMP/UNIVERSAL
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BHEL
90
LS
/
ESIC Hospital Faridabad
Technical Specification
66/11KV GIS Substation
SCHEDULES
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Technical Specification
66/11KV GIS Substation
SCHEDULE
TABLE CONTENTS
SCHEDULE NO.
TITLE
PAGE NO.
SCHEDULE 1
PARTICULARS OF TENDERER
93
SCHEDULE 2
PRICES
94
SCHEDULE 3
SPARE PART LIST
95
SCHEDULE 4
TECHNICAL DATA
SCHEDULE 5
EXPERIENCE – PERSONNEL
121
SCHEDULE 6
DETAILS OF SIMILAR WORK DONE DURING
THE PAST FIVE YEARS BY TENDERED
122
SCHEDULE 7
ORGANISATION CHART
123
SCHEDULE 8
PERFORMANCE GUARANTEE
124
SCHEDULE 9
STATEMENT OF DEVIATIONS
125 - 126
SCHEDULE 10
DECLARATION OF SITE VISIT BY CONTRACTOR
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Technical Specification
66/11KV GIS Substation
SCHEDULE- 1
DECLARATION OF SITE VISIT BY CONTRACTOR
PARTICULARS OF TENDERER
1.
Name of Tenderer
2.
Address
3.
Tender Reference No.
4.
Data of Proposal
Signature ......................................................
Designation ......................
(COMPANY SEAL)
Company .......................................................
Date .............................
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66/11KV GIS Substation
DECLARATION OF SITE VISIT BY CONTRACTOR
SCHEDULE- 2
PRICES
A)
PRICES
The prices given below shall be for the complete supply carried out at site in conformity
with the Tender Documents.
Price in Indian Rupees
H.T. 66 / 11KV Switchyard complete
1.
Ex-works Price of items to be supplied
under the scope of this contract.
2.
Ex-works Price of Spares
3.
Taxes (Excise Duty, Sales Tax, Octroi and
other Central and State Levies inclusive)
4.
Freight and Insurance
5.
Any other item not included above but
required for completion of work.
a)
b)
c)
6.
Total :
Completion time:
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Technical Specification
66/11KV GIS Substation
SCHEDULE: 3
SPARE PARTS LIST
A complete list of spare parts with prices as recommended inventory for two years operation of all
equipment except cables shall be submitted in the following format:
Sl.
No.
Description
Qty.
Ex-works
(in Rs.)
Unit
Rate
Price Transportation
Charges
including
Total
insurance
(in Rs.)
Price
Taxes
and
Du ti e s
(in Rs.)
Total
(inclusive
o f Ta x e s
& Duties)
(in Rs.)
Signature ......................................................
Designation ...................................................
(COMPANY SEAL)
Company .......................................................
Date ..............................
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Technical Specification
66/11KV GIS Substation
SCHEDULE 4
TECHNICAL DATA SHEET FOR GIS
TO BE FILLED BY BIDDER
A.
Switchgear, General
To be filled by bidder
1.
Switchgear type
:
2.
Rated voltage
:
3.
Rated power frequency withstand voltage
- to earth
- across the isolating distance
:
4.
Rated lightning impulse withstand voltage
- to earth
- across the isolating distance
:
5.
Permissible partial discharge intensity for
cast resin at 1.2xUN kV/3
:
6.
Rated normal current
:
-
for busbars and bus coupler
- for feeders
7.
Rated short-time withstand current, 1 second
8.
Rated peak withstand current
:
9.
Rated frequency
:
10.
Auxiliary voltages
:
-
for the motor drive of the disconnector
:
and earthing switches
- tolerance
- for controlling and signalling
- tolerance
- for remote control
- tolerance
- for heating signals
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66/11KV GIS Substation
11.
Loss of gas per year (and compartment)
:
12
Humidity of SF6 (dew point)
- after commissioning
- at service conditions
:
13
Ambient temperature range
- indoor
:
B.
SF6 gas pressures
1.
Filling pressure (at 20 °C)
-
Alarm "SF6 -pressure rising"
Alarm "Loss of SF6"
Alarm "Minimum SF6 density"
Design pressure
Test pressure
Rupture diaphragm bursting pressure
Bursting pressure
2.
Temperature rise of enclosures at rated current
:
- which have to be touched during normal operation
- which need not be touched during normal operation
- which are not accessible to the operator
3.
Circuit breaker
:
4.
Rated normal current
:
5.
Rated short-time withstand current, 1 second
:
6.
Rated short-circuit breaking current
- sym.
- asym. (acc. to IEC)
:
7.
First-pole-to-clear factor (acc. to IEC 6227-100)
:
8.
Auto re closure
:
9.
Rated operating sequence
:
10.
Operating times
:
11.
Opening time (20°C)
:
12.
Break time (20°C)
:
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Technical Specification
66/11KV GIS Substation
13.
Closing time (20°C)
:
14.
Close-open time (20°C)
:
15.
Closing coil
:
16.
Trip coils
:
17.
Rated Voltage
:
18.
Voltage tolerance
:
19.
Rated power
:
20.
Type of motor-drive
:
21.
Rated Voltage
:
22.
Voltage tolerance
:
23.
Rated power
:
24.
Free contacts
:
25.
Operations counter
:
C.
SF6 pressures: 1)
1.
Filling pressure (at 20°C)
- Minimum pressure (at 20°C)
- Alarm "Loss of SF6"
- Alarm "Min. SF6 Density"
- Design pressure
- Test pressure
- Rupture diaphragm bursting pressure
- Bursting pressure
:
:
:
:
:
:
:
For further data see switchgear general
D.
Disconnector:
1.
Rated normal current
:
2.
Rated short-time withstand current,1 second
:
3.
Max. making capacity (capacitive current)
:
4.
Max. breaking capacity (capacitive current)
:
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Technical Specification
66/11KV GIS Substation
5.
Type of motor-drive
:
6.
Closing time
:
7.
Opening time
:
8.
Free signalling contacts
:
9.
For further data see switchgear general
:
E.
Earthing Switch
1.
Rated short-time withstand current 1 second
:
2.
Type of motor-drive
:
3.
Closing time
:
4.
Opening time
:
5.
Free signalling contacts
:
6.
For further data see switchgear general
:
F.
Earthing switch, make-proof
1.
Rated short-time withstand current, 1 second
2.
Rated peak withstand current
3.
Permissible electrical endurance strength of contact :
4.
Capacitive breaking capacity (at 6 kV eff.)
:
5.
Inductive breaking capacity (at 10 kV eff.)
:
6.
Type of motor-drive
:
7.
Charging time of spring mechanism
:
8.
Closing time
:
9.
Opening time
:
10.
Free signalling contacts
:
:
:
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66/11KV GIS Substation
TECHNICAL DATA SHEET FOR 66 KV XLPE CABLES -A2XA2Y (P-ST7)
To be filled by bidder
No. of cores
1
Size( in mm²)
400
Voltage Grade (in kV)
38/66(72.5kV)
1
Name of Manufacturer
2
Cable Type
3
Applicable Standard
4
Permissible Voltage & frequency
variation for satisfactory operation
5
Max. rated conductor temperature
6
Max. allowable conductor temp.
during short circuit
7
Continuous Current carrying
capacities for conditions,
(a) In air…......(A) at 40°C
(b) In ground…(A) at 30°C
Thermal Resistivity 1.5 K.m/W
Depth : 1500mm
8
CONDUCTOR
(i)
Material
(ii)
Shape
(iii)
Nominal Cross Sectional area
(mm²)
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66/11KV GIS Substation
9
CONDUCTOR SCREEN
(i)
Material
(ii)
Minimum Thickness
10
INSULATION
(i)
Material
(ii)
Nominal Thickness
11
INSULATION SCREEN
(i)
Material
(ii)
Minimum Thickness
(iii)
Longitudanal Water Blocking
(iv)
Metallic insulation screen
(v)
Longitudanal Water Blocking
(vi)
Radial Water Blocking
12
INNER SHEATH
(i)
Material
(iii)
Min. Thickness
13
ARMOUR
(i)
Material
(ii)
Nominal Dia. of wire
14
OUTER SHEATH
(i)
Material
(ii)
Nominal Thickness
15
Appr. Overall Dia. of cable (mm)
16
Appr. Weight of cable
17
Std. length of cable (Tol. ± 5%) (m)
(mm)
(mm)
(mm)
--------------------( mm)
---------------------
---------------------(mm)
-------------------------
(mm)
(kg / km)
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66/11KV GIS Substation
18
Minimum bending radius
19
Safe Pulling force
20
Short ckt current for one second (kA)
21
Max. DC Resistance of conductor
at 20°C
(ohm / km)
22
Max.AC Resistance at 90°C (ohm / km)
23
Reactance at 50 Hz
24
Approx. Capacitance (microFarad / km)
(ohm / km)
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66/11KV GIS Substation
TECHNICAL DATA SHEET FOR 66KV CABLE TERMINATION & JOINT
To be filled by bidder
1.
2.
3.
4.
5.
6.
7.
8.
9.
:
:
:
:
:
:
:
:
:
10.
11.
12.
Name of Manufacturer
Country of Origin
Type of Cable Accessories
Conforming Standard
Nominal System Voltage
Highest System Voltage
Impulse Voltage
Frequency
Power freq withstand test 1 min
dry
Short Circuit Current
Performance Guarantee
Creepage (outdoor)
13.
Shelf life
:
14.
Accessories
:
15.
Method of Stress Control
:
16.
Tubing’s & Molded parts
:
17.
Non Tracking material
:
18.
Di-electric strength of insulating
material
:
:
:
:
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Technical Specification
66/11KV GIS Substation
TECHNICAL DATA SHEET - 11KV CUBICLE
To be filled by bidder
1.
Cubicle Type
:
2.
Designation
:
3.
Ratings applicable as per standard
:
4.
Installation
Environment conditions:
Equipment shall work satisfactory in tropical climate with the following
Environmental conditions:
a)
Service temp.
:
b)
Humidity
:
Maximum average relative humidity measured over 24 hours – 95%
Max. Average relative humidity measured over one month – 90%
c)
Altitude
:
The maximum altitude at which the switchgear may be installed is
1000m above sea level. (to be derated for the higher altitudes)
5.
Type of Enclosure
:
6.
Protection Class
a)
For Enclosure
b)
Within the Cubicle
:
:
a)
:
7.
b)
8.
Cubicle provided with service
and test position for C.B.
Cubicle door can be closed with
C.B. in service or test position
:
Voltage Ratings
a) Rated voltage & Frequency
b) Power frequency withstand voltage
for 1 min.
c) Impulse withstand voltage 1.2/50
Micro second wave
:
:
:
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9.
10.
Technical Specification
66/11KV GIS Substation
Current Ratings
a) Rated Normal Current
:
b) Rated Short Time Current
:
c) Rated Dynamic withstand current
:
Temperature rise for rated continuous current
a) Reference ambient temperature
b) Temperature rise over reference
ambient
11.
Busbars:
a)
b)
c)
12.
:
:
Material and grade
:
Reference Standard
:
Sizes (sqmm) of different normal rated currents of main busbars
Current
Copper
Aluminum
630A
50X8
1250A
2X50X8
2X50X!2
1600A
2X50X10
2X80X10
50X12
Control Wiring:
a)
Size & Type
:
b)
Insulation
:
c)
Voltage class
:
13.
Approximate weight
:
14.
Painting
:
15.
Sheet Steel Used
:
16.
Clearances required
:
17.
Standard Cubicle Dimensions
:
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66/11KV GIS Substation
TECHNICAL DATA SHEET 12kV VACUUM CIRCUIT BREAKER
To be filled by bidder
RATING AS PER STANDARD:
IEC 62271-100
1)
a) Rated Voltage 12 kV
b) Frequency
2)
Current Rating
a) Continuous rating in open erection
b) Continuous rating in self ventilated cubicle
c) Short time withstand current for 3 sec.
and dynamic peak withstand current
:
3)
Rated Ambient Temperature
:
4)
Maximum rise of temperature over
reference ambient for current rating
at 40 0C
:
Current rating of CB for ambient
45ºC
50ºC
:
:
6)
Rated Operating duty
:
7)
Breaking & making capacity based
on duty cycle (as per clause 6)
5)
:
a) Rated symmetrical breaking current
:
b) Max. % DC component
:
c) Rated making current
:
Transient recovery voltage
a) Rate of rise at 12 kV
b) Peak Voltage at 12 kV
:
:
9)
Total travel of the mechanism
:
10)
Total length of break per pole
:
11)
Rate of contact travel
a)At tripping
:
b)At closing
:
8)
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Technical Specification
66/11KV GIS Substation
12)
Type of special device, if any, used to limit
the rate of restriking voltage
13)
Make of Vacuum Interrupter
14)
Type of contacts
:
15)
Material of contacts
:
16)
Contact pressure at no load
:
17)
Insulation level of CB
a) One minute power frequency
withstand voltage
b) Impulse voltage withstand with
1.2/50 micro second wave shape
18)
20)
21)
22)
23)
24)
:
:
:
Minimum clearance in air
a) Between phases
:
b) Between live parts & earth
:
Center distance
a) Between phases
b) Between upper & lower contacts
:
:
Whether CB is designed to close and latch
on making or fitted with making
current release
:
Whether CB is trip free or fixed trip
a) If trip free, is it completely trip free
under every method of closing (except
manual closing)
Type of operating mechanism
a)Motor
b)No.of CB operations stored
:
:
:
:
Spring charging motor
a) Rated voltage( Un)
b) Inrush Power (Ps)
c) Rated Power (Pn)
d) Voltage variation
e) Time required to charge the springs
completely at rated voltage
g)Inrush time
f)Insulation voltage
:
:
:
:
:
:
:
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25)
Technical Specification
66/11KV GIS Substation
Method of closing
a) Normal
b) Manual closing
:
:
Closing coil details
a) Rated voltage( Un)
b) Inrush Power (Ps)
c) Maintenance Power (Pc)
d) Voltage variation
e) Inrush time
f) Insulation voltage
:
:
:
:
:
:
27)
Type of closing mechanism
:
28)
Method of tripping
a) Normal
b) Manual Tripping
:
:
29)
Type of tripping mechanism
:
30)
Tripping coil details
a) Rated voltage( Un)
b) Inrush Power (Ps)
c) Maintenance Power (Pc)
d) Voltage variation
e) Inrush time
f) Insulation voltage
:
:
:
:
:
:
Arc duration
a) Max. arcing time at 100% breaking capacity.
b) Opening time
c) Total break time at 100% breaking capacity.
:
:
:
32)
Closing time
:
33)
No. of openings CB is capable of
performing without inspection replacement
of contacts or other main parts
26 )
31)
34)
35)
a) At no load or very low current
b) At 100% rated current app.
c) At 100% rated breaking current
Auxiliary contacts
a) N/O and N/C contacts provided
b) Whether convertible at site
c) Rated current
d) Breaking current at 220 V AC, P.f. 0.7
e) Breaking current at110VDC, L/R = 15 ms
Interlocks & feature
a) Closed CB cannot be racked in from test Yes
to service position.
b) Closed CB cannot be racked out from
service to test position.
c) Mechanical ON & OFF Push buttons
provided.
:
:
:
:
:
:
:
:
:
:
:
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36)
Technical Specification
66/11KV GIS Substation
CB operable in
a) Test / Service position
b) In between Test and Service position
:
:
37)
Weight of Circuit Breaker (Approx.)
:
38)
Provision for slow closing for maintenance
Purpose
:
39)
Rated single capacitor bank breaking current
:
40)
Rated back to back capacitor bank
breaking current
:
41)
Rated capacitor bank inrush making current
:
42)
Rated cable charging breaking current
:
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Technical Specification
66/11KV GIS Substation
TECHNICAL PARTICULARS OF STATION CLASS ARRESTERS
To be filled by Bidder
1.
System voltage KV (RMS)
:
2.
Rating KV (RMS)
:
3.
MCOV KV (RMS)
:
4.
Discharge Current (KA)
:
5.
Line Discharge Class
:
6.
Rated Frequency (Hz)
:
7.
a. IR at MCOV
:
b. IC at MCOV
:
a. Reference Current, mA
:
b. Reference Volt at
reference Current
:
8.
9.
Max RDA (KVp) at
10KA
:
10. Max Switch IMP R.V (KVp)
500A
:
1000A
:
11. Max. Steep Current
Impulse RDV (KVp)
:
12. High Current Impulse
withstand, KAp
:
13. T O V (KVp)
i. 0.1 Secs.
:
ii. 1.0 Secs
:
14. Insulation withstand
a. Lighting IMP
(Dry) (KVp)
:
b. Power Frequency
(Dry/Wet) KV (RMS)
:
c. Switching IMP
(Wet) (KVp)
:
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Technical Specification
66/11KV GIS Substation
15. Partical Discharge P.D.
:
16. PR Relife Class
:
17. PR Relife Class KA (RMS)
:
18. Total Creepage Distance
:
19. Max Cant. Strength
of the arrester KGM
:
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Technical Specification
66/11KV GIS Substation
TECHNICAL PARTICULARS FOR TRANSFORMER
To be filled by bidder
1.
Name & place of the manufacturer
2.
Applicable Standard
:
:
3.
Service
:
4.
Tank cover conventional/bell shaped
:
5.
KVA rating:
a)
b)
6.
HV winding KVA
LV winding KVA
:
:
Rated voltage
:
a)
:
HV winding KV
7.
Rated frequency Hz
:
8.
Number of phases
:
9.
Connections :
a)
b)
HV winding
LV windig
:
:
10.
Connection symbol
:
11
Tappings on HV winding
a)
ON Load
b)
Range
c)
Number of steps
:
:
:
12.
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
For ON load taps, specify details of OLTC
:
gear (incl. type & make)
Manual/ automatic control
:
Remote/ local control
:
If remote control, whether the remote control
:
Cubicle included in Bidder’s scope of supplying
Voltage class of OLTC
:
Current rating of OLTC
:
Location of OLTC with respect to HV winding
:
Whether separate tap winding provided for OLTC :
Whether Selector and diverter chamber are separate :
Total in the OLTC - in selector switch
:
- In diverter switch
:
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13
Technical Specification
66/11KV GIS Substation
Reference ambient temperatures.
a)
Maximum ambient air temperature deg. C :
b)
Maximum daily average ambient air temperature :
c)
Maximum yearly weighted average
ambient temperature
:
d)
Minimum ambient air temperature
:
14.
Type of cooling
15.
Winding
a)
Maximum current density in winding
b)
b)
d)
16.
Tank
a)
b)
17.
:
:
:
Nature of winding insulation
:
Nature of insulation
:
Details of winding and winding conductor
Approximate thickness
i..
Side
ii.
Bottom
iii.
Cover
Material of tank
:
:
:
:
Maximum temperature-rise above an ambient of
:
a)
b)
:
:
Top oil
Winding
18.
Total loss at rated voltage at principle
tapping and rated frequency
19.
Component losses
:
a)
No load loss at rated voltage on
principle tapping and rated frequency
i)
At Rated V
ii)
At 110% Rated V
b)
c)
:
:
:
:
Load loss at rated current for the principle :
tapping at 75 deg. C excluding cooler losses
Auxiliary losses at rated current
:
Note: Tolerances if any shall be mentioned.
Load losses should be specified for full MVA rating
20.
Impedance voltage at rated current for
the principal :
a)
HV-LV
On 8 MVA Base
:
Note : (The above impedance values shall be on full MVA rating of transformer i.e for
winding transformer on 8 MVA )
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21.
a)
Technical Specification
66/11KV GIS Substation
Reactance at rated current and rated frequency
(On full MVA rating of transformer i.e for 2
winding transformer on 8MVA base)
i)
ii)
23.
Insulation level :
a)
Separate source power – frequency
voltage withstand :
i)
HV winding
ii)
LV winding
iii)
LV Neutral
b)
24.
Induced over voltage withstand
i)
HV winding
ii)
LV winding
iii)
LV Neutral
:
:
:
:
:
:
:
:
c)
Full wave lightning impulse withstand voltage :
i)
HV winding
:
ii)
LV winding
:
iii)
LV Neutral
:
d)
Uniform Insulation
i)
HV winding
ii)
LV winding
iii)
LV Neutral
a)
b)
25.
HV-LV
No load current rated frequency
:
:
:
External short circuit withstand capacity
HV
LV
:
:
External short circuit withstand capacity (kA)
i)
for HV side
:
ii)
for LV side
:
Efficiencies at 75 deg. C at unity power factor
a)
At full load
b)
At ¾ full load
c)
At ½ full load
:
:
:
26.
a)
b)
:
:
27.
Regulation at full load at 75 deg. C
a)
At unity power factor
b)
At 0.8 power factor
415 single phase short circuit impedance
Percentage variation between phase.
:
:
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28.
Technical Specification
66/11KV GIS Substation
Minimum clearances between live parts in open air
HV
66 kV
Phase to Phase
Phase to ground
29.
A)
a)
b)
LV
Neutral
LV
11 kV Line
mm
mm
Equipment for ONAN/OFAN Cooling:State:
i)
Radiators on main tank approx.
ii) Fans provided (quantity, rating
& details to be indicated) approx.
State ONAN & ONAF rating in
case of mixed cooling
:
:
:
B)
a)
30.
30.1
30.2
31.
32.
32.
Equipment for ONAF cooling
:
State:
i)
Radiator bank
ii)
Pumps provided
(quantity, rating & details to be indicated)
a)
State ONAF, ONAN rating (KVA) whichever
Is/are applicable in case of mixed cooling :
i) ONAF
ii) ONAN
Number of coolers or cooler banks per transformer. :
Cooling fans
Type
:
Quantity approx.
:
Rating approx.
:
Cooling oil Pumps
:
Type
Quantity
Rating
a) Rating of each cooler or cooler bank in percent. :
b) Whether Radiators can be placed on either side :
of transformers and whether mounted separately
Whether tap changer is mounted vertically or horizontally :
(Sketch indicating OLTC, Location with respect to HV
Winding to be attached)
Terminal arrangement:
b) High voltage
c) Low voltage
d) Neutral (LV)
e) HV terminal phase spacing
f) LV terminal phase spacing
g) any other information
:
:
:
:
:
:
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33.
34.
35.
37.
Technical Specification
66/11KV GIS Substation
Approximate quantity of
a. Core
b. Windings (with insulation)
c. Tank, fitting and Accessories
d. Oil
e. Total mass
:
:
:
:
:
kg.
kg.
kg.
kg.
kg.
Approximate quantity of oil
required for filling. (main tank)
OLTC
:
:
Liters.
Liters.
Overall maximum dimensions of the
Transformer complete with accessories
a) Length
b) Breadth
c) Height
:
:
:
Dispatch details
a) Approximate mass of heaviest package
b) Approximate dimensions of
largest package.
i) Length
ii) Breadth
iii) Height
:
kg.
:
:
:
mm
mm
mm
:
mm
38.
Un – tanking height (Excluding sling height)
Reference Standards
39
Detail of HV Bushing line
a) voltage class
kV
b) Current rating
A
c) 1.2/50 micro sec impulse withstand, KV (rms)
d) make
e) Type
f) Creepage distance, total (mm)
g) Creepage distance, protected (mm)
h) Year of manufacture.
:
:
:
:
:
:
:
:
i)
:
40.
Qty. of oil in oil filled bushing
Details of LV Bushing
a)
b)
c)
d)
e)
f)
g)
h)
i)
Line
Neutral
Voltage class
KV
Current rating
A
1.2/50 micro sec impulse withstand, KV(rms)
Make
:
Type
:
Creepage distance, total (mm)
:
Creepage distance, protected (mm)
:
Year of manufacture
:
Qty. of oil in oil filled bushing
:
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Technical Specification
66/11KV GIS Substation
41.
Details of core grounding
a) Voltage class
kV
:
b) Current rating
A
c) 1.2/50 micro sec impulse withstand, KV (rms)
d) Make
e) Type
f) Creepage distance, total (mm)
g) Creepage distance, protected (mm)
h) Year of manufacture
i) Qty. of oil in oil filled bushing
42.
Details of LV Cable connection
a) Clearance
(mm)
i)
Phase to Phase
ii)
Phase to Earth
b) Drawing enclosed (yes/No)
c) Length pf each phase Bus bar
d) The bus bars are suitable for how many
:
:
:
:
:
Designed Fault Levels
a)
HV
b)
MV
:
:
43.
44.
Core
a) Material & Grade
b) Type of core
c) Operating flux density
d) Maximum flux density
e) Over fluxing capability for + 10% Voltage
& + 5% frequency variation (Yes /No)
f) Specific No load loss for the grade of core
chosen at the specified flux density
:
:
:
:
:
:
44. Details of Cts on HV bushing. (Line)
a)
No. of cores
b)
Ratio for each core
c)
VA Burden _for each core.
(along with image and Vk Wherever necessary)
d)
Accuracy class of each core
e)
Year of manufacture
f)
Short time thermal current rating (KA)
i)
Current
ii)
Rated time
45. b) Details of Cts on LV Bushings(Line & Natural) LV
a) No. of cores
b) Ratio for each core
c) VA Burden_ for each core
(along with lmag and Vk wherever necessary)
d) Accuracy class of each core
e) Year of manufacture
:
:
:
:
:
:
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f)
Technical Specification
66/11KV GIS Substation
Short time thermal current rating (ka)
i) Current
ii) Rated time
46.
Rail guage (along both axis)
47.
Whether Cooler control scheme conforms to specified :
48.
Capability of transformer to remain in operation
From hot condition after of forced cooling
Full load
List of routine test to be carried out
49.
:
:
:
50.
List of other tests which will be carried out against
Extra price quoted also where
:
51.
Overload capacity of transformer for 100% OFAF
Coolers working simultaneously
:
52.
Whether Neutral end surge diverter recommended
by bidder
53.
If yes details of surge diverter
a) Type
b) Make
c) kV rating
d) kV rating
54.
Tertiary winding if any kept isolated then the bidder
to state one terminal to be earthed or any other
precautions required during service conditions
:
:
55.
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
k)
l)
m)
On load tap changer – Particulars
Make
:
Type, designation
:
Suitable for auto/manual operation
:
Rated voltage kV
:
Basic insulation level (BIL) of
:
One minute power frequency voltage
:
Rated current (A)
:
No. of steps
:
Step voltage (V)
:
Rated voltage of drive motor – V
:
Whether diverter and selector chambers are separate ;
Rated voltage of control circuit – V
:
Time to complete tap changing operation
from any one step to next higher or lower tap.
i)
On auto operation
:
ii)
On manual operation
through push button
:
n) List of routine tests to be carried out on
:
tap changer
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Technical Specification
66/11KV GIS Substation
o) Location of the taps with respect to the terminals
of the tapped winding
p) Drawing or pamphlet number of the technical and
descriptive particular or the OLTC, enclosed with
the bid.
q) Separate conservator and Buchholz
relay provided of OLTC
r) RTCC ( Remote Tap Changer Control Panel)
i.
List of tap changer Annunciation
ii
Two sets of potential free
contacts for Scada provided
iii
Two sets of 0/20 mA output for
tap position indication provided
iv
415 V Autochage over facility
for OLTC motor provided
56.
57.
Marshalling Box
a)
Derived control supply
Voltage (Volt)
b)
415 V/ control supply autochangeover facility provided.
c)
Local OT/WTI provided.
d)
Remote OTI/WTI proved
e)
Two sets of 0/4-20 mA signals
for OT/WTI provided
f)
List of annuciations
g)
Two sets of potential free contacts
for annunciation provided?
:
:
:
:
:
:
:
:
:
:
:
:
:
:
Whether marshalling boxes (ground as well as than) provided
As per specification i.e.
:
Separate for ground mounted cooler control cabinet, separate}
Tank mounted for CT secondary and other cables separate
Tank mounted for WTI, OTI etc and 1No. RTCC panel)
58.
Surface preparation /Painting
58.1
58.2
58.3
Adequate rust proofing done on transformer
Adequate rust proofing on radiators
Type of paint (epoxy /enamel)
Details of measures to be enclosed)
Whether galvanized radiation offered
as alternative
58.4
59.
Conservator Oil preservation
System details (Air bag)
a)
Material of separator /Air bag
b)
Details of Air Bag)
i.
Design pressure
ii.
Working pressure
iii.
Bursting pressure
(puncture strength)
:
:
:
:
:
:
:
:
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c)
d)
Technical Specification
66/11KV GIS Substation
Procedure of filling with air bag to be enclosed :
Any precautions
:
60.
List of utilities to whom bidder has supplied
transformers of similar rating specifically
year of supply and year of commissioning
of these transformers
:
61.
General arrangement drawing of the
:
Transformer indication details of HV/MV/LV
terminals and over all dimensions enclosed (Yes/ No)
62.
Type test reports of similar transformers
:
enclosed
(Yes /No)
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Technical Specification
66/11KV GIS Substation
SCHEDULE : 5
EXPERIENCE - PERSONNEL
The Tenderer shall furnish in the format given below details of the qualifications and experience
of key technical personnel proposed for this Contract. Resumes of the key personnel shall be
enclosed separately.
Name
Professional
Qualifications
I.
On Site
II.
Off Site
Age
Personnel employed - Technical - Officers
Staff
Present Position
with Tenderer
Experience
Nos.
Only a format in which the information is to be given is indicated above. The Tenderer shall
attach additional sheets of bigger sizes to accommodate the necessary information, if required.
Signature ......................................................
Designation ......................
(COMPANY SEAL)
Company .......................................................
Date.............................
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Technical Specification
66/11KV GIS Substation
SCHEDULE - 6
DETAILS OF SIMILAR WORK DONE DURING THE PAST FIVE YEARS BY TENDERER
(Clause 1.1 (b) of Instructions to Tenderers)
Sl.
No.
Full
Postal
Address
of Client
Description
of the Work
Value of
Contract
Completion
Time as
Sta ted i n
the Tender
(Weeks)
Date of Actual
Years of
Commencement
of Work
Completion
Time
(Weeks)
Completion
Remarks
Note:- 1. Tenderers are specifically requested to furnish all the details about the last assignment
done for the Client.
2.
Completion date should be that mentioned in the Completion Certificate given by the
Client.
3.
Only a format in which the information is to be given is indicated above. The Tenderer
shall attach additional sheets of bigger sizes to accommodate the necessary information,
if required.
4. The above list shall include work done by Sub-Tenderer as well in the same format.
Signature .....................................................
Designation .....................
(COMPANY SEAL)
Company ......................................................
Date .............................
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Technical Specification
66/11KV GIS Substation
SCHEDULE -7
ORGANISATION CHART
The tenderer shall indicate the following:1. The organisation he proposes to set up for execution of the work both at
design/manufacturing stage as well as site execution stage. It is understood that
this will be augmented from time to time depending on the requirements for timely
completion of work, as directed by Employer/Employer’s Representative.
Designation of Key Personnel
2.
Name and short resume of
experience
Estimated labour force at site:
(a)
(b)
Peak
Average
:
:
Only a format in which the information is to be given is indicated above. The Tenderer
shall attach additional sheets of bigger sizes to accommodate the necessary information,
if required.
Signature ......................................................
Designation ......................
(COMPANY SEAL)
Company .......................................................
Date.............................
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Technical Specification
66/11KV GIS Substation
SCHEDULE - 8
PERFORMANCE GUARANTEE
The Tenderer shall submit, an undertaking in the following format along with the Tender,
to guarantee the performance of system to the levels stipulated in the Tender documents
and/or specified below : Strike out the one which is not applicable.
1.
All Components of various ratings and types offered have
worked continuously for 4000 hrs, at atleast 75% of the rated
YES/NO
value under normal working conditions, without failure.
2.
All components are of latest design and spare parts are readily
available indigenously
YES/NO
3.
Approved type test certificates are available for all the
components and equipment offered
YES/NO
4.
Identical type and makes of components and equipment are used all
YES/NO
throughout
5.
All the individual components or equipment will withstand or are
YES/NO
protected against the abnormal operating conditions of the plant
6.
For measurement of performance guarantee the certified loss
in factor in steps of +1% shall be considered.
Signature .....................................................
Designation .....................
(COMPANY SEAL)
Company .......................................................
Date .............................
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Technical Specification
66/11KV GIS Substation
SCHEDULE 9
STATEMENT OF DEVIATIONS
1.
The following are the particulars of the deviations from the requirements.
Sl.
No.
2.
Clauses
Deviation
Remarks
(including justification)
The following are the particulars of the deviations from the requirements of
Instructions to Tenderers.
Sl.
No.
Clauses
Deviation
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Remarks
(including
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125
ESIC Hospital Faridabad
Technical Specification
66/11KV GIS Substation
Note: 1. Where there is no deviation, the statements should be returned duly signed
with an endorsement indicating 'No Deviations'.
2. The Tenderer shall indicate price adjustment against each deviation which he
shall like to add to the tender price for withdrawing his deviations, if the
same are unacceptable to the Employer.
Signature ......................................................
Designation ......................
(COMPANY SEAL)
Company .......................................................
Date .............................
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Technical Specification
66/11KV GIS Substation
SCHEDULE - 10
DECLARATION OF SITE VISIT BY CONTRACTOR
We hereby declare that we have visited the said Site of Work and have acquainted and satisfied
thoroughly with the existing Site Condition.
Signature ......................................................
Designation ..................................................
(COMPANY SEAL)
Company .......................................................
Date .............................
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