Item No. 19
S/I/C Period: 4 months
Technical Specifications for Supply, Installation, Commissioning & Testing of 1000
KVA Transformer and allied accessories at Ajmer Dairy Plant.
Supply, Installation, Commissioning & Testing of 1000 KVA Transformer and its allied
accessories i.e. RMU, ACB, HT Cable, LT Cable etc. same are to be placed in existing
electrical circuit of Ajmer dairy. The existing system consist of 2 Nos. of transformers
of 500 KVA each and having OCB of Jyoti make at incoming of each transformer. Both
the transformers are capable of working independently and in parallel whenever required
to cater the existing plant load. Now the new system i.e. 1000 KVA transformer is to be
placed in existing HT circuit by placement of RMU (Ring Main Unit) at extension of
existing system & out put of 1000 KVA transformer shall be connected to 1600 Amp.
ACB placed at LT panel.. The 1000 KVA transformer will work independently & 500
KVA transformers can be loaded individually or in parallel. The system should ensure
perfect safety inter looking between OCBs of 500 KVA transformers and RMU (Ring
Main Unit) of 1000 KVA transformer. The detail specifications of items required for
successful placement of 1000 KVA transformer in existing circuit are detail below :Part A
S.
Description
No.
1
Supply, Installation, Testing &
Commisioning of 11 KV Ring
Main Unit as per following
Specifications : 11 KV, 630 A,
indoor type , floor mounted with
copper Bus bar s, RMU should
consist of 1 No. 630 A On-load
isolator module as incoming & 1
No. 400 A manually operated T-off
Vacuum Circuit Breaker modules
as outgoings. All live parts, bus
bars, isolators & VCBs of RMU
should be enclosed in sealed for
life welded single stainless steel
tank having IP67 degree of
protection filled with SF6 gas as
insulation. RMU should be having
following accessories such as ring
core
CTs,
self
powered
microprocessor based numerical
protection relays for O/C, S/C and
E/F protections. Cable supports,
front
cable
terminations,
mechanical indications for breaker
On/Off/trip/Spring charges, air
insulated
Bus
PT
panel,
Manometer for SF6 gas Pressure
indications inside the enclosure
Qty.
Unit Rate (Rs.)
Supply Installation
One set
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
1
Total
(Rs.)
with preassure healthy marking as
per IEC: 265, 129, 694, 529,
801,56, consisting of following
items:
Incoming: On-Load Isolator
(Incomer) should consist of
following accessories.
11 KV, 630 A On-Load isolator
module for isolating the incoming
supply along with series integral
earth switch.
3 Nos. Ring core CTs designed for
11 KV 80/1 A, 2.5 VA, Accuracy
class 1.0 Metering purpose.
1 No. Digital Multifunction Energy
Analyser with all the power and
Load parameters as standard
functions.
Suitable Cable bushings for front
cable terminations.
Arc Proof cable covers with self
interlocking mechanism between
doors, earth switch isolator.
Mechnical Indication for isolator
ON, OFF, Earth.
Outgoing: 1 Nos. T-off VCB
should consist of following :
400 A manually operated T-off
Vaccum Cicuit Breaker modulesfor
making and breaking of fault
current alog with off- load isolator
in series for isolation purpose &
integral earth switch.
3 Nos. Ring core Cts designed for
11 KV 80/1 A, 2.5 VA, Accuracy
class 5P10 for protection.
Self powered microprocessor based
protection relays for 2 O/C, and
E/F.
Suitable Cable bushings for front
cable terminations.
Arc Proof cable covers with self
interlocking mechanism between
doors, earth switch isolator.
Mechnical Indication for isolator
ON, OFF, Earth.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
2
2
3 Nos.Potential Transformer of the
ration 11KV 3/ 110 V 3 , 50 VA,
Class 1.0 with HT fuses on primary
side and MCB on secondary side.
CFL for illumination.
Space Haeter with Thermostat.
Supply, Installation, testing &
commissioning of available 1000
KVA copper-wound, 3 – phase, 50
Hz oil immersed, naturally cooled,
out door type Power Transformer
having a vector configuration
DY11 with plus/minus 5% tapping
taken out in tap changing switch,
HT winding connection in Delta
and LT winding connection in Star
and neutral brought out and
connected to a separate terminal
with outdoor open porcelain
bushing and complete with first
charge of requisite transformer oil,
with following being available :- Fitting and Accessories
- Oil conservator tank with drain
plug and filling cap.
- silicla gel dehydration breather
charged with silica gel
- oil level gauge
- oil drain valve
- thermometer
pocket
with
thermometer
- earthing terminal
- lifting lugs
- four bidirectional roller wheels
- air release valve
- explosion vent
Parallel operation of transformers:-
-
-
-
Transformers offered for the
same vector group DY 11, rating
and voltage ratio
should be
capable of operating in parallel
satisfactorily. It shall be installed
and commissioned as per IS
10028-1981 or latest.
Other item- Fire bucket 3 nos
capacity
20
ltrs,
Fire
extinguishers CCL type 5 Kg-2
no, Shock treatment chart 5 n0,
Danger plate-5 Nos.
The detail specification of 1000
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
3
KVA transformer are detailed
at Annexure – F.
- Further the tenderer is advised
to submit the foundation drawings
of transformer and get it
approved.
3.
4.
5.
Providing and laying underground
cable IS:1554 and approved make
suitable for working voltage upto
and including 11 KV in aluminium
conductor
XLPE
armoured
including excavation of 30cm x
75cm size trench as per IS:1225,
25cm thick under the layer of
sand, IInd class brick covering
refill earth in the removing portion
making necessary connection
including testing etc. as required.
The size of the cable should be 3 x
95 sq.mm make ICL/ Gloster/
CCI/ Torrent.
Supplying and making of Indoor /
outdoor cable jointing for 11 KV
XLPE cable of heat shrinkable
type termination kit including
preparation of cable ends. Make M
Seal/Denson.
(This item will
include all requisite hardwares
lugs etc.)
a) Indoor type .. .. .. .. ..
b) Outdoor type .. .. .. .. ..
Supply,
Installation
and
Commissioning
of
advance
maintenance free chemical gel
earth single pole earthing system
of 2 mtrs. Length and 80mm dia
2mm thick electrolytic grade
copper tube duly filled with
conducting natural mineral with
permanent sealing at both ends
with lead terminals at the top
along 1 set of Part – I 5Kg.
mixture of calcium carbonate, tetra
sodium Hexcyno Ferrate, Sdium
sulphate. Part – II 5Kg. Copper
sulphate.
30 Mtr.
3 Nos.
2 Nos.
Earthing for
Transformer 4
HT Panel
2
LT Panel
1
Total 7 Nos.
7 Nos.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
4
6.
Supply and erection of cubical
panel fabricated from CRCA sheet
14/16 SWG dust and vermin proof
together with degreasing and
applying two coats of red oxide
and two coats of stove enameled
light grey paint.
The panel
includes all required hardwares
moulded insulators and proper
rating of copper busbars having
provision as follows:INCOMING : MAIN LT PANEL
- ACB 1600 A Micro Processor
Controls L&T / Siemens / MG
make.
1 No.
- voltmeter 0-500 V 96 x 96mm.
- ammeter 0-500/5 A 96 x 96mm. 1 No.
- LT crnt transf. 500/5 A.
- Voltage selector switch.
1 No.
- Ammeter selector switch.
3 Nos.
- LED base indicating lamps 1 No.
RYB with holders.
1 No.
- Control fuses and fuse bases
with tops.
3 Nos.
7.
Supply,
Installation
&
Commissioning of 1600 Amp.
TPN 415 Volts, Aluminum Bus
Duct, Air insulated housed in
enclosures fabricated with 14 / 16
SWG GI sheet and duly powder
coated. The housing shall be
designed for complete dust and
vermin proof with IP - 54 level
protections. Busbar 3 run for phase
bus one run for neutral and one run
for earth bus.
Note : Tenderer should quote
unit rate for supply & laying of
bus duct between transformer
and LT Panel. System should be
CPRI approved.
30 Mtr.
* Please refer Part – D also.
Total of Part ‘A’
The tenderer is required to take necessary approvals from the concerned Inspectorate of
Electrical, Ajmer.
The supplier or erector should submit ‘A’ Class contractor Certificate.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
5
Part - B
TECHNICAL SPECIFICATIONS OF MOTOR CONTROL CENTRES
(SHEET STEEL)
1.0
Motor Control Centre (sheet steel)
1.1
Functional requirement :
To receive, control and distribute electrical power at 440V 50Hz. AC on a sheet
steel housing.
1.2
Design requirement and scope of supply :
1.2.1
Statutory requirement :
Motor Control Centre is to be manufactured / assembled as per the latest ISI
specifications, Indian Electricity rules, including special requirements of
Rajasthan State Electrical Inspectorates.
1.3
Housing details :
1.3.1
The switchboard shall be fabricated out of 16SWG sheet steel and shall consist of
free standing front openable panels arranged to from a continuous line up of
uniform height. Cold rolled sheets shall be used for doors and front covers. Front
doors shall be hinged type and bus bars, bars and cables alloys covers shall be
bolted type. Suitable M.S. channel base frame should be provided.
Switch Board shall be extensible at both the ends by addition of vertical sections.
Ends of the bus bars shall be suitably drilled for this purpose.
The Switch board shall be totally enclosed, dust, weather and vermin proof.
Gaskets of durable material shall be provided for doors and other openings.
Suitable hooks shall be provided for lifting the boards. These hooks when
removed, shall not leave any opening in the board.
All hardware shall be corrosion resistant. All joints and connections shall be
made by galvanized zinc passivated or cadmium plated high tensile strength steel
bolts, units and washers secured against loosening.
The switch board shall be in cubical design (each feeder components are housed
in individual cubical). Suitable cable and bus bar alleys shall be provided. All
components of the switch board should be approachable from front. The
maximum and minimum operating handle / push button height of any feeder shall
not be more than 1800 mm or less than 400 mm with reference to panel bottom.
Supporting arrangement for dressing of power and control cables in cable alleys
shall also be provided.
1.3.2
1.3.3
1.3.4
1.3.5
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
6
1.3.6
Painting :
All metal surfaces shall be thoroughly cleaned and degreased to remove all scales,
rust, grease and dirt. Fabricated structures shall be pickled and treated to remove
any trace of acid. The under surface shall be prepared by applying a coat of
phosphate paint and a coat of yellow zinc chromate primer. The under surface
shall be made free from all imperfections before undertaking the final coat.
After preparation of the under surface, the panel shall be spray painted with final
two coats of approved paint. Supplier shall obtain details of approved paint from
the purchaser before final painting.
The finished panels shall be dried in stoving ovens in dust free atmosphere. Panel
finish shall be free from imperfections like pin holes, orange peals, fun-off paint
etc.
All unpainted steel parts shall be cadmium plated or suitably treated to prevent
rust, corrosion etc.
1.3.7
Name Plates :
Name plates for all incoming and out coming feeders shall be provided on doors
of each compartment. Name plates shall be fixed by counter sunk screws only
and not by adhesives. Special danger plates shall be provided as per requirement.
1.4
Busbar sizing, connecting and supports :
1.4.1
The busbar shall be made from high conductivity electrolytic aluminium. The
busbars and supports shall be capable of withstanding the rated and short circuit
current, stated in the feeder details. Minimum size of main power busbars shall
be 200 Amps. rating. Maximum current density permissible for aluminium
busbars shall be 8.2 Amps/mm². An earthing busbar of minimum 150 mm²
section aluminium shall be provided outside panel at bottom throughout the
length of the panel.
The busbars shall be provided with PVC/heat shrinkable insulating sleeve.
Supports for busbars shall be made of suitable size hyleum sheets/epoxy
compound blocks and these should be adequate in number so as to avoid any sag
in the busbars.
Minimum clearance between phase to phase shall be 32 mm and between phase to
neutral / earth shall be 26 mm.
1.4.2
1.4.3
1.5
Power Connections :
1.5.1
For power inter-connections within the panel board :
Copper conductor PVC insulated cables of adequate cross section shall be used.
For current rating above 63 Amps. aluminium busbar strips of adequate rating
shall be used. Minimum size of copper conductor to be used shall be 2.5 mm².
Cables lugs/sockets of suitable size and type shall be used for all interconnections.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
7
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
For all aluminium to copper connections, suitable bimetallic material (“CUP-al”
washers) shall be used.
For each outgoing motor (upto 60 HP) feeder, suitable size terminal blocks (min.
3 ways) shall be provided in its cubical and wiring upto these from contactors
shall be done by panel supplier. All the terminal blocks shall be suitable for
aluminium conductor cable.
For incoming and outgoing feeders of the MCC aluminium conductor cable will
be used and hence the panel is to be designed for receiving these and wherever
required cable boxes shall be provided in panel by supplier. Removable gland
plates shall be provided on top/bottom of panel for cable entries.
To prevent accidental contacts, all interconnecting cables/busbars and all
terminals also shall be shrouded.
Standard colour code of red, yellow and blue for phases and black for Neutral to
be followed for all busbars / conductors.
1.6
Auxiliary wiring and Terminals :
1.6.1
Wiring for all controls, protection, metering, signaling etc. inside the switch board
shall be done with 650 volts PVC insulated copper conductors. Minimum size of
those conductors shall be 1.5 mm². Control wiring to component fixed on doors
shall be flexible type.
The complete panel would be sub-divided into different sections by purchaser and
each section shall have its own control circuit with fuse and indication. Terminal
block (Minimum 3 – ways) for control wiring shall be provided for each outgoing
Motor feeder in its cubical. 10% spare terminals shall always be available in each
terminal block. Control wiring upto these terminal blocks shall be done by
supplier.
All control wiring should be provided with necessary cable / sockets / lugs at both
ends.
Conductor shall be terminated using compress on type lugs. Each termination
shall be identified at both the ends by PVC ferrules. The identification
termination numbers should match with those on drawings.
Control wiring for motor feeders should be such that the “green” light of motor
feeder is “NO” only when control as well as power circuit of feeder is “NO”.
1.6.2
1.6.3
1.6.4
1.6.5
1.7
Switchgears :
1.7.1
Air Circuit Breaker : The technical specifications given subsequently.
1.7.2
Moulded case circuit breakers (MCCBs) :
MCCBs shall be provided with interlocking system suitably.
1.7.3
MCB:
4 poles MCB of suitable rating for all electrical loads shall be provided.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
8
1.7.4
The rating of the power contractors shall be as required depending upon the
feeder rating indicated in the specifications and as per the table given below.
Contractor coils shall be suitable for 230 / 440 Volts, 50Hz. Unless otherwise
specified. All contractors shall be supplied with minimum 2 NO + 2 NC auxiliary
contacts. Additional contacts if required for inter-licking etc. shall also provide.
1.7.5
Protective devices :
Electronic relays shall be provided for all motor feeders. The relays shall be
adjustable and self reset type. There should be SPP (single phase prevention)
built up in the relay.
Any other relays, if required for motor feeders shall be specified in the feeder
details.
1.7.6
Timers :
The timers shall be electronic type, suitable for 240V 50Hz. supply.
1.7.7
Push Buttons (PBs) :
push buttons shall be luminous type with 22mm hole size. Push buttons shall be
with contact elements, shall be generally mounted on openable covers. Colours
shall be as follows :
Stop / open / emergency
Start / close
-
Red
Green
It should have minimum 1 NO + 1 NC contacts. Push buttons with built-in
indication lamps shall also be accepted in with case separate indication lamps are
not required.
1.7.8
Indication Lamps :
Indication lamps shall be LED type with 22 mm hole size.
Colours shall be as under:Phase
:
Red, yellow and blue
Open/Stop/Emergency
:
Red
Close/Start
:
Green/Black
Bulbs shall be suitable for 250 volts AC supply.
1.7.9
Current Transformers (CTs) :
CTs shall be cast resin insulated type. Primary and secondary terminals shall be
marked individually. CTs shall preferably be mounted on stationary parts. CT
rating and rations shall be as per feeder ratings. These shall be capable of
withstanding momentary short circuit and symmetrical short circuit current for 1
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
9
second. Neutral side of CTs shall be earthed. Protection on CTs shall be low
reactance, accuracy should be class I VA burden. The CTs shall be of ALPHA
make.
1.7.10 Measuring Instruments :
These shall be of square pattern having approximate dimensions 96mm x 96mm,
flush mounting type. Necessary auxiliary instruments like CTs PTs etc. are also
included in the scope of supply.
The voltmeter shall be of 0-500 V range with VSS.
The ampere meter shall be 800/5 A range with ASS.
The voltmeter and Ampere meter shall be of AEI / IMP make and the voltage
selector switches shall be of Sulzer / Kaycee make
All AC meters shall be moving iron type having class 1.0 accuracy. Ammeters
for motor feeders shall have a non liner compressed scale at the end to indicate
starting current.
Voltmeter shall be suitable for direct line connection.
Voltmeter shall be connected through fuses only
Energy meters shall be suitable to measure unbalanced loads of 3 phases, 4 wire
systems.
2.0
3.0
Special requirements :
D.G. set change over switch :
There is a requirement of 1 No. change over switch. There will be change over
switch so that operation of DG set 250 KVA is possible when there is no power &
also to isolate State Electricity Board power supply when there is necessity to
operate the DG set.
4.0
Incomer :
a)
b)
4.1
For incoming feeders upto and 800 A rating provide MCCBs with 40 KA
breaking capacity with overload / short circuit and earth fault protection.
For all incoming feeders provide CT operated ammeter with rotary
selector switch; voltmeter with selector switch and 3 Nos. indicating
lamps with red lines.
Outgoing feeders :
a) Motor feeders of rating of 10 HP or above shall be provided with suitable
automatic star-delta starters along with electronic protected relay, timer, triple
pole switch fuse unit/MCCB and ammeter. All motor feeders upto 60 HP
shall be provided with MCB and above 60 HP MCCBs with a minimum
breaking capacity of 40 KA shall be provided. For feeders below 15 HP
rating provide direct reading ammeter and for feeders of 15 HP and above
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
10
b)
c)
d)
e)
f)
g)
rating provide CT operated ammeters. All the power contractors of star-delta
starters shall have same current rating.
Feeders for star-delta starters will be provided with specified current rating in
the distribution boards.
Motor feeders of rating less than 10 HP will be provided with suitable direct
on line starters along with thermal overload relays with single phase
preventing and MCBs as per requirement.
The motor feeders wired for remote control will be provided with only an
OFF push buttons the distribution board whereas for the feeders wired for
local control from the board, both ON and OFF push buttons along-with
green indicating lamp for ON will be provided on the distribution board.
Suitable cable glands provision will be provided for each of the incoming and
outgoing feeders.
The components to be used will be of either L&T/ Siemens / Bhartiya Cutler
Hammer / C&S / GE make. Tenderer should specify the make offered.
The following selection table shall be followed for starters of motor feeders
unless otherwise specified:
S.
No.
415 V Motor H.P.
Contractor
Rating
Amps.
16
MCB / MCCB
Rating / Amps.
1
0 to 10.0 HP
2
15 HP
32
63
-do-
3
20 to 25 HP
63
63
-do-
4
30 HP
63
100
-do-
5
40 to 50 HP
100
100
-do-
6
60 HP
100
100
-do-
7
75 HP
150
150 / 175MCCB
8
100 HP to 150 HP
150
25 Switch
225 MCCB
Starters / S.F. units of higher ratings should be preferably located at the bottom portion of
MCC.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
11
Part – C
Technical specifications of Air Circuit Breaker 4 pole 1600 Amp.
Quantity Required : - 1 No.
The air circuit breaker shall be 4 pole manually operated draw out type with
microprocessor based protection release for overload, short circuit. & earth fault
protection. The design shall be quick make and quick break type with slow closing
facility for ease in maintenance. The total break time should be less than 30m sec
including arcing time of 10m sec. The release shall be R.M.S. sensing type requiring no
external supply for its basic function of tripping against fault. The release should
diagnose the different fault i.e. there shall be inbuilt LED’s in protection release for over
current, short circuit & earth fault. The release shall have provision for function
blocking. The ACB shall be provided with under voltage protection. The setting of over
load in release shall be 40% to 100%. The setting of short circuit shall be minimum 2 to
10 times. The ACB shall have Ics = Icw for 1 Sec. for short circuit breaking capacity of
not less than 50 KA rms at 415 Volts 50HzAC. The overload current setting may be 40%
to 100% of maximum rated value. The ACB neutral pole shall make earlier & break later
than main pole.
• Overload (phase) current setting 0.4 to 1.0.
• Neutral fault current setting 0.5 to 1.0.
• Earth fault current setting 0.1 to 0.6.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
12
Part – D
Necessary Cables, Cable Trays etc.
All necessary cables for connecting HT side to the primary of the transformer and LT
side of the transformer to the main panel on LT side, main panel to distribution panels,
from various panel boards to various equipments falls in the scope of the work.
The quantities mentioned for cables & cable trays in this tender document are
indicative only and may vary as per site conditions. The tenderers are required to
quote for the quantities mentioned for various items in this section based on which
the financial comparative statement shall be drawn but they should also quote the
unit rate price (F.O.R. site) for each item separately also in order to make Ajmer
Milk Union release payment for bills of the firm for the actual quantities of items
supplied, installed, tested and commissioned as per site conditions. For connecting
various equipments following cables and related shall be required :1100 KV GRADE, 3.5 C ARMOURED ALUMINUM CONDUCTOR, PVC
INSULATED LT CABLE / BUSDUCT SELECTION CHART AS PER THE FEEDER
DETAILS AT 8 VOLTS DROP.
S.
NO.
FEEDER
TYPE
FEEDER
RATING
1. 1000
KVA 1600 A
TRANSFORM
ER TO MAIN
ACB
1600
Amp.
Total
CABLE SIZE
Aluminum
Bus Duct,1600
Amp.
TPN
415 Volts,
LENGTH
OF CABLE
(in Mtrs.)
30
Unit Rate
TOTAL
AMT.
(in Rs.)
The cables of Gloster / Hawell or equivalent make (equivalent make subjected to
approval of purchaser) need be supplied. All necessary lugs of Dowell make for the
various cables with due crimping shall have to be supplied and installed. Necessary
loops for cables shall have to be provided wherever necessary.
The unit rates for the cables of all sizes mentioned in the tender document also need be
quoted.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
13
Part – E
Technical Specifications for Busbar Duct System for connecting 1000
KVA transformer with LT panel ACB of 1600 Amp. at Ajmer Dairy
Plant.
Supply, Installation & Commissioning of 1600 Amp. TPN 415 Volts, Aluminum Bus
Duct, Air insulated housed in enclosures fabricated with 14 / 16 SWG GI sheet and duly
powder coated. The housing shall be designed for complete dust and vermin proof with
IP - 54 level protection. Busbar 3 run for phase bus one run for neutral and one run for
earth bus.
¾ Current Rating : 1600 Amp.
¾ System Voltage : Upto 600 to 1000 Volt.
¾ Conductor material : High conductivity Aluminum.
¾ Ingress Protection of IP54.
¾ Halogen free, fire retardant Class – H – Epoxy insulation.
¾ High temperature with stand capability of 55 degree over 50 degree Celsius as
normal operating temperature, single Bolt bridge joint system incorporates 5mm
thermal expansion provision.
¾ Design and construction for lower mV drops, higher efficiency distribution
system.
¾ Short circuit ratings (up to 100 kA).
System should consist of component such as straight length / End flange, End Feed Unit
Tap of units, Bends, Fixing clips etc.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
14
Part - F
TECHNICAL SPECIFICATIONS FOR 1000 KVA TRANSFORMER
Supply period – 3 months.
Supply of 1000 KVA Cooper wound 3 Phase 50 Cycles, oil immersed, naturally
cooled, Core type, outdoor type with HV outdoor & cable box on LV side power
transformer with stepping down provision from 11 KV to 440 V, having a vector
configuration DY 11 with plus/minus 5% tapping taken out in tap changing switch (with
provision of 5 steps), HT winding connection in Delta and LT winding connection in Star
and neutral brought out and connected to a separate terminal with outdoor open porcelain
bushing and complete
-
With first charge of requisite transformer oil.
-
-
Fitting and accessories (as detailed on next page)
-
Oil conservator tank with drain plug and filling cap.
-
Silica gel dehydrating breather charged with silica gel.
-
Oil level gauge.
-
Oil drain valve.
-
Thermometer pocket with thermometer.
-
Earthing terminal.
-
Lifting lugs.
-
Four bidirectional roller wheels.
-
Air release valve.
1 Set
Explosion vent.
The transformer should conform to the IS specifications. The winding temperature rise –
55 deg C above ambient, oil temp. rise – 50 deg. C above ambient, impedance – 5.5% or
above, permissible no load losses - 1.35 KW (max.), permissible on load losses – 9.75
KW (max.). The quality of oil should be good conforming to IS : 335 and the oil should
be of SAVITA/APAR make or equivalent make (equivalent make subjected to purchaser
approval). Reference standard IS:2026-1977 Compliance & above mentioned
specifications.
The winding temperature indicator with alarm & tip contacts should be of Thermal make
(mercury type). The number of earthings (independent) should be four.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
15
Standard Fittings & Accessories
S.
No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
Particulars
Rating & Diagrams Plate
Earthing Terminals
Lifting Lugs of Transformer
Lifting Lugs of Top Cover
Drain Valve with Plug
Filter Valve with Plug
Conservator Tank
Oil level gauge
Oil Filling hole with Plug
Air Release Plug
Thermometer pocket
Silica gel breather with oil seal
Explosion Vent
Off. Ckt. Tap Changer Switch Handle & Position indicator
L.V. Terminal Box with Extended Copper Flats/suitable Bus
palm
Neutral brought out terminal for earthing externally
Bi-Directional rollers
Oil temp indicator 6” with alarm & trip contacts
Double Float Buckholz relay with alarm and trip contacts
Inspection cover
Marshalling Box with complete wiring
Magnetic oil level gauge with low 1 No.
Jacking Pads
Winding temp. indicator with alarm trip contacts
Prismatic oil level gauge.
HV Cable Box, Long pin bushings, suitable for connecting on
primary side 11 KV grade XLPE Cable entry.
Quantity
1 No.
5 Nos.
2 Nos.
2 Nos.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
1 No.
4 Nos.
1 No.
1 No.
1 No.
1 No.
1 No.
4 Nos.
1 No.
1 No.
1 Set
Note : Further the tenderer is advised to submit 3 sets of the foundation drawings of
transformer and get it approved. The supplier will also have to submit test certificates of
transformer and oil.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
16
Important Note :
The tenderer is advised to visit to site so as to apprise himself of actual site condition
and quantum of work involved.
Special notes :
This is a turn key project. The quantities of various items listed are tentative only and
may vary on either side during execution. The final quantities of these would be as per
site conditions. Cost of installation for any addition or deletion in quantities will be
calculated based on the unit prices indicated. All necessary material which may be
required for the successful completion of the project falls in the scope of the work. If any
extra quantities of quoted items are needed then the tenderer shall supply those at the
quoted unit price. If any extra item(s), not included in the tender but required for
successful completion of the work, the same will be either supplied by the RCDF / Ajmer
Milk Union and erected by the tenderer or supplied and erected both by the tenderer at
mutually agreed rates considering purchase price, taxes and handling charges etc.
Necessary ESI / PF deductions, wherever applicable shall be borne by the tenderer.
The requisite approval form Chief Electrical Inspectorate, Government of Rajasthan must
be obtained by the tenderer and the actual payment shall be reimbursed by RCDF / Ajmer
Milk Union against production of original documents.
The tenderers are required to give the price bid for all items section-wise in the same
faction as of Part – A showing the F.O.R. unit rate for supply as well F.O.R. unit rate
installation, testing & commissioning as well the total cost.
In addition to the standards mentioned, all works shall also conform to the requirements
of the following for which necessary certifications of the concerned departments are to be
obtained and submitted to the concerned Milk Union / RCDF :a) Indian Electricity Act and rules framed thereunder.
b) Fire insurance regulations.
c) Regulations laid down by the Chief Electrical Inspector of the State / State Electricity
Board.
d) Regulations laid down by the Pollution Control Board.
e) Regulations laid down by the Factory Inspector of the State.
f) Any other regulations laid down by the local authorities.
g) Installation operating manuals of original manufacturers of equipment.
H:\SARAS\Tender Form\NIT XXXI Tech. specifications\Transfomer 1000 KVA Ajmer (Item No.19).doc
17