Doc No.

GEL-IN-CIL-IDT-V-DRG-003
Technical Specifications
Rev. No. 1

Client Contractor

2 MVA INVERTER DUTY TRANSFORMER

DRAWINGS & GTP

PROJECT
2 MW RETROFITTING PROJECT
CHHATTISGARH INVESTMENT LTD,CHHATTISGARH

CLIENT
CHHATTISGARH INVESTMENT LTD (CIL)

EPC CONTRACTOR
GENSOL ENGINEERING LTD

1 18-03-2024 First Issue - TMC TMC GEL

Rev No. Date of Release Detail of Revision Total Pages Produced By Reviewed By Approved By
 1 2 3 4 5 6 7 8
NO. DESCRIPTION
1 CONSERVATOR WITH AIRCELL (*)
CORE TO FRAME EARTHIG NOTES:-
R1 APPROXIMATE WEIGHT IN kg TANK PLATE 2 CONSERVATOR OIL FILLING VALVE (GUN METAL)
DETAIL 1) OVER ALL DIMENSIONS & WEIGHT ARE SUBJECT TO
CORE /FRAME INSU. 2000 EARTHING COPPER STRIP 3 TMC MONOGRAM PLATE
SIDES 5 MM 4 PRISMATIC OIL LEVEL GAUGE WITH MIN MARK
A WINDING & INSU. 1050 A
BOTTOM 5 MM 2) CLEARANCES IN H.V. IN CABLE BOX 5 MAGNETIC OIL LEVEL GAUGE (WITH RAIN HOOD) (*)
TANK & FITTING 2280
TOP 6 MM
- PHASE TO PHASE 130 mm. 6 CONSERVATOR DRAIN VALVE (GUN METAL)
OIL IN kg 2210 - PHASE TO EARTH 80 mm. 7 CONSERVATOR CONNECTING PIPE (*)
TOTAL WEIGHT 7540 3) CLEARANCES IN L.V. CABLE BOX 8 CONSERVATOR SHUTOFF VALVE (GUN METAL)
OIL IN LITERS 2210 - PHASE TO PHASE 25 mm. 9 DOUBLE FLOAT BUCHHOLZ RELAY (WITH RAIN HOOD) (*)
- PHASE TO EARTH 20 mm. 10 (*)
SILICAGEL BREATHER
4) PAINT :- PU PAINT 631 IS-5 (THICKNESS-220 MICRON(MIN.)) 11 EARTHING TERMINAL (DIAGONALLY OPPOSITE)
2U 2V 2W
5) POSITION OF FITTING SHOWN INDICATIVE ITS 12 LIFTING LUGS
33 POSITION & SHAPE MAY CHANGE WHILE ACTUAL 13 JACKING LUGS
UNTANKING HEIGHT DESIGN & MANUFACTURING.
19 14 TRANSPORT OIL LEVEL GUAGE
B 6) TRANSPORT DIMENSION ARE MARKED BY 15 DRAIN CUM BOTTOM FILTER VALVE (GUN METAL) B
29 16 TOP FILTER VALVE (GUN METAL)
37 7) (*) MARKED ITEMS ARE REMOVED AT TIME OF DISPATCH.
17 (*)
22 8) EARTH LINK 10 sq.mm. CU BRAIDED CABLE PROVIDED FOR JOINTS. RADIATORS WITH AIR RELEASE & DRAIN PLUG
10 9) NITRILE/SRBC TYPE GASKET TO BE USED. 18 RADIATOR SHUTOFF VALVE (CAST IRON)

2 19 OTI,WTI POCKET
24

2930
20 THERMOMETER POCKET
3

3200
2100

1N
21 LV CABLE BOX WITH GROUND SUPPORT
22 PRESSURE RELIEF VALVE (WITH RAIN HOOD)
23 INSPECTION COVER WITH HANDLE
20
24 AIR RELEASE PLUG
18
R1 25 ON LOAD TAP CHANGER
C 17 C
26 RATING & DIAGRAM PLATE
27 OIL TEMPERATURE INDICATOR
1U 1V 1W 28 WINDING TEMPERATURE INDICATOR
PLAN VIEW 29 MARSHALLING BOX
30 SKID TYPE UNDERBASE
2 (*)
31
42 32 HV CABLE BOX
38 9 8 7 23 12
1 33 SHIELD EARTHING BUSHING WITH COPPER STRIP
34 N2 INJECTION VALVE (25 mm) FOR N2 FIRE FIGHTING SYSTEM (GM)
5
35 MOUNTING BRACKET FOR SIGNAL BOX
6 4
36 OIL DRAIN VALVE (50 mm) FOR N2 FIRE FIGHTING SYSTEM (GM)
43 16
37 MOUNTING BRACKET FOR FIRE DETECTOR
D D
36 21 38 DISTANCE PIECE FOR TCIV
14 39 ANTI EARTH QUAKE CLAMP
40 GAS COLLECTING FLEXIBLE PIPE (SS)

40 41 VALVE LOCATING PLATE

2700
32 42 CONSERVATOR AIR RELEASE PLUG
43 HV NEUTRAL BUSHING WITH GUARD
1900

26
41
28
35
R1 27
25
33
E 34

13 30
15
1000 GROUND LEVEL 1000 1000
39 11 31
3700 SIDE VIEW 3700 CUSTOMER GENSOL ENGINEERING LIMITED
3900 (WITH OUT RADIATOR) 3900
PO.NO. PO/23-24/182 DATED : 26.02.2024
HV ELEVATION VIEW LV ELEVATION VIEW
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 01.03.24 Sheet Scale

Chk. - A3 N.T.S.
F F
Rev Modification Date Drw.
01 Revised as per customer comment 16.03.24 ap This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408/01 1 of 1 01

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

A A

= =

= =
= = = =

B B

C C

D D

E = = = = E
= =

= = CUSTOMER GENSOL ENGINEERING LIMITED

PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 01.03.24 Sheet Scale

Chk. A3 N.T.S.
F F
Rev Modification Date Drw.
This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408/02 1 of 1 00

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

160.0000
150.0000
A A

NOTES:-
OIL COOLED COPPER WOUND TRANSFORMER (1) ALL DIMNS. ARE IN mm. UNLESS OTHERWISE STATED.
REF. I.S. 2026 IMP. VOLTAGE AT NORMAL TAP % (2) MAT. OF PLATE SHOULD BE 22 SWG STAINLESS STEEL 304 (ANODISED
B COOLING KNAN B
CORE & WINDING kg 3050 & ETCHED).
RATING kVA 2000
WEIGHT OF OIL kg 2210 (3) THE VALUE OF IMP. VOLTAGE, LOSSES & SR.NO. WILL BE PUNCHED
RATED

VOLTAGE
{ HV V

LV V
11000

800
OIL QTY Ltrs.

kg
2210 AFTER TRANSFORMER TESTING.
FULL LOAD
TOTAL WEIGHT 7540 (4) PLATE IS REQD. IN ORIGINAL METAL FINISHED BACK-GROUND
CURRENT { HV A

LV A
104.97

1443.38
YEAR OF MANUFACTURE
LI VOLTAGE (HV/LV) KVp
2024
75 / 20
WITH LETTERS & FIGURES ETCHED AND PAINTED BLACK.
PHASE 3
PF VOLTAGE (HV/LV) KVrms 28 / 10
FREQUENCY 50 Hz
MAX. AMB. TEMP. °C 50
230.0000
220.0000

C C
MAX. TEMP. RISE 40/45
OIL/WDG °C
SERIAL NO. 1001408

TAP
POSN. IN EACH VOLTAGE VOLTAGE
2WS2
LV WTI NO. PHASE
CT
2WS1 1 12 - 11 11825
2U 2V 2W 2 12 - 10 11550
1N 1U 1V 1W 3 12 - 9 11275
1 1 1 4 12 - 8 11000
800
3 3 3 5 12 - 7 10725
4 4 4
6 12 - 6 10450
5 5 5
D 7 12 - 5 10175 D
6 6 6
TO OLTC

TO OLTC

TO OLTC

7 7 7
8 12 - 4 9900
8 8 8 9 12 - 3 9625
9 9 9

10 10 10

11 11 11
2U 1U

12 12 12

2 2 2 2V
1N
1W 1V

+7.5% TO -12.5% IN STEP OF 2.5%. 2W

VECTOR GROUP : YNd11
LV WTICT : 1732/5 A, 10 VA, ACC CLASS 1
Manufactured By.:- TMC Transformers (INDIA) Private Limited
E 26 1/2 , VILLAGE KHANDIWADA (ASOJ), NEXT TO NARMADA CANAL, E
Ø6.0000WAGHODIA, VADODARA-HALOL ROAD, VADODARA-391510. (INDIA)
CUSTOMER GENSOL ENGINEERING LIMITED
PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 01.03.24 Sheet Scale
A3 N.T.S.
F F
Rev Modification Date Drw.
01 Revised as per customer comments 16.03.24 AP This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408-03 1 of 1 01

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

A A

B B

C C

D D

E E

CUSTOMER GENSOL ENGINEERING LIMITED

PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 1.03.24 Sheet Scale

Chk. A3 N.T.S.
F
HV BUSHING F
Rev Modification Date Drw.
This document is property of TMC ASSEMBLY DETAIL
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408/14 1 of 1 00

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

A A

B B

C C

D D

E E

CUSTOMER GENSOL ENGINEERING LIMITED

PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 1.03.24 Sheet Scale

Chk. A3 N.T.S.
F F
Rev Modification Date Drw.
This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1.03.24/04 1 of 1 00

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

ELECTRICAL SPECIFICATION IS:2099-1986

A

1) Rated Voltage ......................................................................3.6 kV.

2) Rated current...............................................................2000 AMPS
3) Dry Power Frequency Withstand Voltage Test (one minute)....21 kV.
4) Minimum Creepage Distance ............................................... 90 MM

NOTE :
B
1) End Copper Palm will be electrotinned 12 to 15 microns.
2) Electrolytic Copper with high Electrical Conductivity.
3) Colour brick red.
4) All dimensions are in mm.
5) Bushing MAKE - UNITED INSULATION
6) FUALT LEVEL - 50 kA FOR 2 SEC.
C
375

130
80 85 25 85 100
47.5 47.5

70
=

135

175
35

35

60
=

70
E
15 40
40 15 25

55

CUSTOMER GENSOL ENGINEERING LIMITED Drw. RAKESH 01.03.24 Sheet Scale

Chk. - A3 N.T.S.
F PO.NO. PO/23-24/182 DATED : 26.02.2024 F
Rev Modification Date Drw.
WO.NO. 1001408 This document is property of TMC
Transformers (INDIA) Private
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
CLIENT/ Drawing No. Sheet Rev.
parties without our authorization. Private Limited
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL) 1001408/15 1 of 1 00

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

A A

190 190
1

150 3
B B
4

6
HOLE
7

550 8

650 (INSIDE) 9
C
450 75 C

(INSIDE) 10

100
390 390 100Px3=300

D
110 110 D

E E
3
CUSTOMER GENSOL ENGINEERING LIMITED
PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408

4 PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH

CLIENT/
5 END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 01.03.24 Sheet Scale
6
Chk. A3 N.T.S.
F LV CABLE BOX F
7 Rev Modification Date Drw.
This document is property of TMC ASSEMBLY DETAIL
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408/05 1 of 1 00

1 2 3 4 5 6 7 8
 1 2 3 4 5 6

NOTES:-
1) MARSHALLING BOX SHALL BE WEATHER PROOF AND SUITABLE FOR OUTDOOR
APPLICATION.
215
2) DEGREE OF PROTECTION SHALL BE IP 65.
165 50 3) 2.0 mm CRCA SHALL BE USED FOR CONSTRUCTION OF MARSHALLING BOX.
A 4) MARSHALLING BOX TO BE DISPATCHED ALONG WITH TRANSFORMER. A
5) BUBBLE GASKETS SHALL BE PROVIDED.

40

40
MARSHALLING BOX
6) ACTUAL MOUNTING POSITIONS OF ACCESSORIES IN MARSHALLING BOX MAY VARY.
DS 7) DRILLED DETACHABLE BOTTOM GLAND PLATE SHALL BE PROVIDED 3 MM THICK.

120
WTI OTI
8) A POCKET FOR MINIMUM A4 SIZE PAPER SHALL BE PROVIDED ON THE DOOR
(INSIDE) OF MARSHALLING BOX.
9) MAXIMUM DOOR OPENING ANGLE SHALL BE 150 DEG.
4HOLES 10) BRAIDED COPPER SHALL BE USED FOR DOOR EARTHING.
11) ALL HARDWARE SHALL BE OF SS.
12) TINNED COPPER EARTHING BUS OF APPROPRIATE SIZE SHALL BE USED .
MCB 1 MCB 2 MCB 3 MCB 4
13) RECOMMENDED MAXIMUM TEMPERATURE SETTING OF OTI & WTI.

375
14) SCHEMATIC DIAGRAM WILL BE MOUNTED ON MARSHALLING DOOR.
DS 15) CANOPY WILL BE WELDED TYPE.

PVC CHANNEL
DS TH
T

B B

100
165
580
630

DEVICE ALARM TRIP

OTI
C
WTI
C
FINISH PAINT SHADE :-

INTERNAL : GLOSSY WHITE

EXTERNAL : PU 631 OF IS 5

CUSTOMER GENSOL ENGINEERING LIMITED

PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
LEGEND DESCRIPTION
CLIENT/
BRASS DOUBLE COMPRESSION GLAND SUITABLE FOR 2.5 END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
D GLAND-1 sq.mm, Drw. NISHANT 1.03.24 D
1.1KV GRADE, 4-CORE CABLE USED FOR BUCHHOLZ RELAY Chk. A3 N.T.S.
NISHANT 1.03.24
DOUBLE COMPRESSION GLAND SUITABLE FOR 2.5 sq.mm, Rev Modification Date Drw.
GLAND-2 & 3 1.1KV GRADE, 2-CORE CABLE USED FOR PRV & MOLG This document is property of TMC
Transformers (INDIA) Private
BRASS DOUBLE COMPRESSION GLAND SUITABLE FOR 2.5 Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Sheet Drawing No. Rev.
GLAND-4 sq.mm, parties without our authorization. Private Limited
01 1001408-06 00
1.1KV GRADE, 2-CORE CABLE USED FOR WTI CT
1 2 3 4 5 6
 1 2 3 4 5 6

BUCHHOLZ RELAY MOLG PRV OIL TEMP IND(OTI) WINDING TEMP IND(WTI)
PLSW 2 4 2 2 2 4 2 4

E
1 3 1 1 1 3 1 3

N
P
A T A A A T A T
A 2 H76 1
A
1 A H75 2
HS TH H 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 2WS1 2WS2

1 2 H74 1 2
DS
TL
G1 G2 G3

H72

H73
G1 G2 G3
MCB

H70 H71 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 2WS1 2WS2

SPARE 22-27
21
01

11
02

20
03
04
05
06
07
08
09

12
10

13
14
15
16
17
18
19
B B

**
NOTE:-
* = METALIC LINK 2WS1 2WS2

** = WIRE LINK

G4
MARSHALLING BOX BOUNDARY
CUSTOMER'S CABLE G4
FOR 230V AC, 50 Hz.,1-PH

2WS1 2WS2

C C

CUSTOMER GENSOL ENGINEERING LIMITED

PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
D Drw. NISHANT 1.03.24 Sheet Scale D
CHKD A3 N.T.S.
NISHANT 1.03.24
Rev Modification Date Drw.
This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Sheet Drawing No. Rev.
parties without our authorization. Private Limited
01 1001408-06 00

1 2 3 4 5 6
 1 2 3 4 5 6
SR LEGEND DESCRIPTION TYPE & RATING MAKE LOCATION QTY
NO.

MAGNETIC OIL LEVEL GAUGE WITH 1 NO. LOLA

1 MOLG 5A,240VAC/0.5A,240VDC 1
CONTACT
A A

2 PRD PRESSURE RELIEF DEVICE WITH 1 TRIP CONTACT 10A,240VAC/0.4A,250VDC VIAT/Sukrut 1

TRANSFORMER
BUCHHOLZ RELAY WITH (DOUBLE FLOAT),1 Alarm+1
3 BR 5A,250VAC/2A,250VDC 1
Trip CONTACTS

WINDING TEMPERATURE INDICATOR CURRENT

4 WTI CT 2150/5 A 10 VA,CL-5 MANTHAN ELEC 1
TRANSFORMER

OIL TEMPERATURE INDICATOR WITH 2-SETS OF

5 OTI 5A, 250VAC/0.5A, 220VDC 1
CONTACTS: 1-2 FOR ALARM,3-4 FOR TRIP
MODEL NO : 1031 PRECIMEASURE
WINDING TEMPERATURE INDICATOR WITH 2-SETS OF CAPILLARY LENGTH: 3m
6 WTI 1
B CONTACTS: 1-2 FOR ALARM,3-4 FOR TRIP B

7 DS DOOR LIMIT SWITCH 2A, 240VAC SURAJ/EQ 1

9 H SPACE HEATER 40W, 240V AC 1

GIRISH & EGO
10 TH 240V AC 1
MARSHALLING
11 IL LAMP 5W,240V.AC. LED TYPE PHILIPS/ORPAT BOX 1

12 PLSW THREE PIN PLUG SOCKET INDUSTRIAL YPE 10A, 240V AC SCHNEIDER/EQ 1

MINIATURE CIRCUIT BREAKER FOR HEATER &

13 MCB 6A, 240V AC SIEMENS/L&T/HAGER/EQ 1
LIGHTING CIRCUIT FOR LAMP,HEATER & 3 PIN SOCKET

CONTROL TERMINAL BLOCKS SUITABLE FOR 800 V & 32

A
C 14 T - ELMEX/CONNECTWELL 1 SET C
CT TERMINAL BLOCK SUITABLE FOR 800 V & 32 A

CUSTOMER GENSOL ENGINEERING LIMITED

PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
D Drw. NISHANT 1.03.24 Sheet Scale D
CHKD A3 N.T.S.
NISHANT 1.03.24
Rev Modification Date Drw.
This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Sheet Drawing No. Rev.
parties without our authorization. Private Limited
02 1001408-06 00

1 2 3 4 5 6
 1 2 3 4 5 6 7 8

A A
OIL FILLING PROCEDURE FOR A CONSERVATOR
EQUIPPED WITH FLEXIBLE SEPARATOR
1. ACTIVITIES TO BE PERFORMED BEFORE ERECTING CONSERVATOR:
a) ENSURE TIGHTNESS OF ALL CLAMPING HARDWARE ON ALL FLANGES OF CONSERVATOR, OIL LEVEL GAUGE &
CONFIRM THAT THE OIL LEVEL GAUGE GLASSES ARE IN TACT.
b) FIT 3 Nos. GM VALVES & 1 No. DRAIN VALVE ENSURING THAT THE DIRECTION OF ARROW ON THE VALVE'S NOTES TO PLATE MANUFACTURER
BODY, POINT AWAY FROM CONSERVATOR.
B B
c) INSTALL M.O.L.G. WITH THE POSITION OF FLOAT & ARM AS SHOWN. 1. AIR RELEASE VALVES. FOR STAINLESS STEEL
2. FLEXIBLE SEPARATOR.
3. INSPECTION COVER. 1. MATL.:- 1.2 THK. STAINLESS STEEL.
4. M.O.L.G. 2. BACKGROUND TO BE NATURAL FINISH.
5. CONSERVATOR DRAIN VALVE. 3. ALL LETTERS AND FIGURES TO BE BLACK.
6. BREATHER PIPE. 4. PLATE TO BE MANUFACTURED BY
7. AIR FILLING ADAPTER. ETCHING PROCESS.
8. PRESSURE GAUGE.
9. AIR FILLING VALVE.
10. AIR HOSE.
11. BUCHHOLZ RELAY PIPE.
C 12. AIR RELEASE PLUGS. C
2. REMOVE THE BLANKING PLATE OF DRAIN VALVE & KEEPING THE VALVE OPEN, INFLATE THE FLEXIBLE SEPARATOR
AT AN AIR PRESSURE AS SHOWN IN THE FOLLOWING TABLE.
DIAMETER OF CONSERVATOR FILLING PRESSURE
500 & 700 mm 0.1 kg/sq. cm ( 1.4 psi )
800 & 900 mm 0.075 kg/sq. cm ( 1.0 psi )
1000 ~ 1500 mm 0.05 kg/sq. cm ( 0.7 psi )

3. CLOSE THE DRAIN VALVE, FIX THE BLANKING PLATE AND OPEN AIR RELEASE VALVES.
4. START FILLING OIL SLOWLY THROUGH THE BOTTOM FILTER VALVE ON TRANSFORMER.
D D
5. AS SOON AS OIL STARTS OVERFLOWING THROUGH EACH VALVE, CLOSE THE VALVES ONE BY ONE.
6. STOP OIL FILLING AFTER ENSURING OVERFLOW THROUGH ALL THE THREE VALVES AND REPLACE AIR FILLING
ADAPTER WITH SILICA GEL BREATHER ALLOWING THE FLEXIBLE SEPARATOR TO DEFLATE.
7. CONTINUE OIL FILLING AND OBSERVE THE M.O.L.G. STOP FILLING OIL WHEN THE POINTER OF
M.O.L.G. REACHES THE LEVEL CORRESPONDING TO AMBIENT TEMPERATURE.
CAUTION
ONCE THE OIL FILLING IS COMPLETED, DO NOT OPEN ANY OF THE AIR RELEASE VALVES ON THE TOP OF THE
CONSERVATOR. IF AIR RELEASE VALVE IS OPENED, AIR WILL ENTER THE CONSERVATOR AND OIL LEVEL IN
PRISMATIC OIL LEVEL GAUGE WILL FALL.
E E
GAUGE GLASSES ARE TO BE OBSERVED PERIODICALLY TO ENSURE THAT THEY INDICATE FULL OIL LEVEL ALWAYS.
CUSTOMER GENSOL ENGINEERING LIMITED
PO.NO. PO/23-24/182 DATED : 26.02.2024
WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 01.03.24 Sheet Scale

Chk. A3 N.T.S.
F G.A OF INSTRUCTION PLATE FOR F
Rev Modification Date Drw.
This document is property of TMC FLEXIBLE SEPARATOR
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408/34 1 of 1 00

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

200

A 6 188 6

POSITION OF VALVES ON TRANSFORMER NOTES TO PLATE MANUFACTURER

4 HOLES 6 DIA
LV SIDE 1. MATL.-1.2 THK ALUMINIUM
2. BACK GROUND TO BE SATIN SILVER
B
3. ALL LETTERS AND FIGURES TO BE BLACK.
4. PLATE TO BE MANUFACTURED BY ETCHING PROCESS.

250
HV SIDE

238
SR.NO. DESCRIPTION TYPE MATERIAL
1 DRAIN CUM BOTTOM FILTER VALVE GLOBE GUN METAL
2 TOP FILTER VALVE GLOBE GUN METAL
D 3 RADIATOR SHUT OFF VALVE BUTTERFLY CAST IRON
4 CONSERVATOR SHUT OFF VALVE GLOBE GUN METAL
5 N2 INJECTION VALVE FOR FIRE FIGHTING SYSTEM GLOBE GUN METAL
6 OIL DRAIN VALVE FOR FIRE FIGHTING SYSTEM GLOBE GUN METAL
7 CONSERVATOR DRAIN VALVE GLOBE GUN METAL
8 PRESSURE RELIEF VALVE - -
9 CONSERVATOR OIL FILLING VALVE GLOBE GUN METAL
10 CONSERVATOR AIR RELEASE PLUG - -

CUSTOMER GENSOL ENGINEERING LIMITED

WO. NO.- 1001408 PO.NO. PO/23-24/182 DATED : 26.02.2024

WO.NO. 1001408
PROJECT 2MW RETROFITTING PROJECT CHHATTISGARH
CLIENT/
END CUSTOMER CHHATTISGARH INVESTMENT LIMITED (CIL)
Drw. RAKESH 01.03.24 Sheet Scale

Chk. - A3 N.T.S.
F F
Rev Modification Date Drw.
This document is property of TMC
Transformers (INDIA) Private
Limited and its contents must not
be copied or imparted to third TMC Transformers (INDIA)
Drawing No. Sheet Rev.
parties without our authorization. Private Limited
1001408/18 1 of 1 00

1 2 3 4 5 6 7 8
 ANNEXURE - A

Technical Parameters - 2-CCA, Al Wound ONAN Inverter Duty Transformer

S.No Description GEL REQUIREMENT Vendor Reply

1. Rated 2 MVA 2 MVA

2. Make As per GEL Approved Vendor List TMC TRANSFORMERS (INDIA) PVT. LTD.

3. Standards to be Referred IS 2026, IEC 60076 and CBIP Guide lines IS 2026, IEC 60076 and CBIP Guide lines

4. Service & Duty Outdoor / Continuous operation Outdoor / Continuous operation

5. Type of cooling ONAN KNAN

6. Rating in (MVA) HV LV HV LV

7. With ONAN cooling 2.0 2 2 2

8. Rated voltage

HV (KV) 11 11

LV (KV) 0.800(LV-1) 0.800(LV-1)

9. System Voltage variation ±10% ±10%

10. Rated frequency (Hz) 50 Hz 50 Hz

11. Frequency variation ±5% ±5%

12. Number of phases 3 3

13. Current at rated load and voltage on

principal tap
HV amps. Details to be Provided by Supplier 104.97 A

LV amps. Details to be Provided by Supplier 1443.37 A

14. Connections

HV Star Star

LV Delta Delta

15. Connection Symbol ( Vector Group ) Ynd11 Ynd11

16. Temperature rise of Oil

At full ONAN rating 40 °C 40 °C

17. Temperature rise of Winding

At full ONAN rating 45 °C 45 °C

18. Temperature gradient between winding Details to be Provided by Supplier 18 DEG C

and oil (°C)
19. Limit of hot spot temperature for Details to be Provided by Supplier 98 DEG C
which the Transformer is designed
(°C)
Time in minutes for which the Details to be Provided by Supplier 110% - CONTINIOUS
Transformer can berun at full load
without exceeding the max.
Permissible temperature at
reference ambienttemperature when
Supply of Cooling fans are cut off
21. Ambient peak temperature specified 50°C 50°C

22. Tappings on windings on HV side Off Circuit Tap Changer On load Tap Changer
 Number of steps 4 steps ( 5 Positions) 8 steps ( 9 Positions)

Range of tapping for variation Plus 7.5% to minus 12.5% @ 2.5 Plus 7.5% to minus 12.5% @ 2.5

23. Losses (KW-MAX)

No load losses at rated voltage and Losses based on maximum 2 KW (MAX)

frequency at principal tap flux density of 1.9 wb/m2 at rated
MVA, voltage & frequency
and maximum current
density of 2.5 A/mm2 at all
taps -2kW (max)

Load losses at rated output , rated 18 kW (max,no possitive tolerance) 18 KW (MAX)

frequency and corrected for 75°C
Auxiliary losses at rated output, 0 KW (Max.) N/A
normal ratio, rated voltage, rated
frequency and ambient temperature
(KW)
Total losses at normal ratio inclusive 20kW (max,no possitive tolerance) 20kW (max,no possitive tolerance)
of auxiliary equipment losses (KW)
corrected to 75°C
24. Resistance per phase (Ohms) at 75°C

H.V. winding Details to be Provided by Supplier 0.279 Ω

L.V. winding Details to be Provided by Supplier 0.003755 Ω

25 Positive sequence impedance on rated

MVA base at rated current and
frequency at 75°C winding
temperature
a. At Principal tap(H.V TO L.V) 6% (-15% to + 10%) at 12MVA Base 6 % (IS TOL)

b. At Principal tap(L.V TO L.V) Details to be Provided by Supplier 6 % (IS TOL)

26. Zero sequence impedance

at reference temperature of 75°C NA 80-110% OF Positive Sequence Impedence
at principal tap percent

27. Noise level in decibels when As per NEMA TR-1 ≤ 68 dB

energized at normal voltage and
normal frequency at No-load

28. % Reactance at rated MVA base at Details to be Provided by Supplier 5.83%

rated current and frequency percent
29. % Regulation at full load and
75°C winding temperature expressed
as a percentage of normal voltage
At unity power factor Details to be Provided by Supplier 1.08%

At 0.8 pf (lagging) Details to be Provided by Supplier 4.37%

30. % Efficiency at 75°C winding

temperature as derived from
guaranteed loss figures and at UPF

Full load Details to be Provided by Supplier 99.01%

¾ load Details to be Provided by Supplier 99.20%

½ load Details to be Provided by Supplier 99.35%

¼ load Details to be Provided by Supplier 99.38%

31. Short Circuit rating for 2 seconds

 HV winding Details to be Provided by Supplier 3.86 kA

LV winding Details to be Provided by Supplier 53.16 kA

32. Permissible over loading

HV winding As per IS: 2026-7 (Detailed Value to be 110%

provided by Supplier)
LV winding 110%

33. Over load capacity of Transformer

duration for the following over loads
starting with Transformer unexcited
(ambient temperature 50°C)

10% As per IS: 2026-7 (Detailed Value to be Continious

provided by Supplier)
20% Continious

30% Continious

50% Continious

75% Continious

100% Continious

34. Overload capacity of Transformer

duration for the following over loads,
starting with Transformer
after continuous running on open
circuit (ambient temperature 50°C)
10% As per IS: 2026-7 (Detailed Value to be Continious
provided by Supplier)
20% 1 Minite

30% 05 Seconds

50% ---

75% ---

100% ---

35. Permissible emergency short As per IS: 2026-7 (Detailed Value to be

time, loading of the Transformer provided by Supplier
immediately following full load run
(ambient temperature 50°C)

2 seconds 2 Seconds

5 seconds ---

10 seconds ---

30 seconds ---

1 minute ---'

5 minutes ---

36. Terminal arrangement

High voltage (HV) Bare Bushing(Detachable Cable Box suitable Bare Bushing(Detachable Cable Box suitable
for 6.35/11 kV, 1Rx3Cx300MM), Al. ARMOURED, for 6.35/11 kV, 1Rx3Cx300MM), Al. ARMOURED,
XLPE, CABLE XLPE, CABLE
 Low voltage (LV) & Neutral
LV Cable Box shall be suitable for termination of LV Cable Box shall be suitable for termination of
8 Runs of 3Cx300Sq.mm AL XLPE Cable. LV 8 Runs of 3Cx300Sq.mm AL XLPE Cable. LV
Bushing shall be Tinned Copper followed by Bushing shall be Tinned Copper followed by
Flexible Jumper of Tinned Copper and Rigid Bus Flexible Jumper of Tinned Copper and Rigid Bus
bar(Tinned Copper). Bushing shall be 3.3KV. bar(Tinned Copper). Bushing shall be 3.3KV.
Approximate Support for Rigid Bus Bar and Approximate Support for Rigid Bus Bar and
Cables shall be provided.Additional hole in two Cables shall be provided.Additional hole in two
LV termination shall be provided in each phase LV termination shall be provided in each phase
for Auxiliary Transformer connection. for Auxiliary Transformer connection.

37. Insulating and cooling medium Synthetic Ester Oil Synthetic Ester Oil

38. Insulation level for Winding HV LV

1.2/50 Micro second impulse 170 20 70 KVP 20 KVP

withstand voltage
(KVp)
Power frequency withstand test voltage 70 10 28 KVRMS 10 KVRMS
on live end
(kV rms)
Power frequency withstand test voltage 70 10 28 KVRMS
on neutral end (kV rms)

39. Over flux withstand capacity of the

transformer in
Percentage

Continuous Details to be Provided by Supplier 110%

1 Minute Details to be Provided by Supplier 125%

0.5 Minutes Details to be Provided by Supplier 140%

40. Neutral Floating Neutral Floating Neutral

41. Tank

A. Type of tank Conventional Conventional

B. Approximate thickness of sheet

Sides (mm) 6 6

Bottom (mm) 10 6

Cover (mm) 10 8

Conservator Tank (mm) 3 3

Cooling Tubes / Radiators (mm) 1 1

C. Materials of tank and construction Mild steel, Welded Construction Mild steel, Welded Construction

D. Vacuum to be maintained during Details to be Provided by Supplier Apply Vacuum should be lessthen Atmosphiric pressure
oil filling in Transformer tank (torr)

E. Vacuum to which the tank can Details to be Provided by Supplier Apply Vacuum should be lessthen Atmosphiric
be subjected without distortion (torr) pressure (Less 25 mm/Hg Approx)

F. No. of bi-directional wheels provided Four 4

G. Type and quantity of pressure Details to be Provided by Supplier 1

relief device and pressure at which it
42. Conservator

Total volume (Litres) Details to be Provided by Supplier 6 TO 8% OF TOAL OIL VOLUME

Volume between the highest & Details to be Provided by Supplier 5% of total oil volume
lowest visible oil
43. Core :-

A. Type of core construction Core Type Core Type

 B. Type of core joints Mitered Interleaved Mitered Interleaved

C. Flux density at rated voltage and

frequency and at principal tap Tesla

At rated voltage Not Exceed 1.9 wb/m2 Not Exceed 1.7 wb/m2

At 110% rated voltage Details to be Provided by Supplier Not Exceed 1.85 wb/m2

At 90% rated voltage Details to be Provided by Supplier Not Exceed 1.65 wb/m2

D. Magnetizing current on HV side at 0.35

normal ratio at and frequency and at

85% of rated voltage Details to be Provided by Supplier < 0.5 %

100% of rated voltage Details to be Provided by Supplier < 1.0%

110% of rated voltage Details to be Provided by Supplier < 2.0%

E. Power factor of magnetizing Details to be Provided by Supplier 0.35

current at normal voltage ratio and
frequency
F. Material of core laminations (CRGO) M4 or Better M4 or Better

G. Thickness of core laminations (mm) Details to be Provided by Supplier 0.27 MM

H. Specific loss of the core material Details to be Provided by Supplier 1.2

watts per kg at working flux density
I. Whether core construction is without Details to be Provided by Supplier YES
core bolts
J. Insulation of core bolt Details to be Provided by Supplier N/A

K. Insulation of core bolt washers Details to be Provided by Supplier N/A

L. Insulation between core lamination Details to be Provided by Supplier Varnish Coating

M. Core bolt insulation withstand Details to be Provided by Supplier YES

voltage for 1
N. Insulation of clamping plate Details to be Provided by Supplier PBD between Core & Frame

O. Describe location / Method of core Core to core clamping structure at top through TOP YOKE/ FOIL TYPE
grounding copper link
44. Winding :- HV LV HV LV

A. Type of HV & LV winding Layer/Continuous Foil with DDE Layer Spiral

Disc Paper

B. Material of winding conductor Electrolytic Grade Copper Electrolytic Grade Copper

L. Method of making joints carrying Brazing Brazing

current

C. Maximum current density

of windings (at rated current)
H.V. <300 (A/cm²) 3.195 A/sq.mm

L.V. <300 (A/cm²) 3.447 A/sq.mm

D. Whether HV windings are interleaved Details to be Provided by Supplier No.

E. Whether windings are preshrunk Details to be Provided by Supplier YES

F. Whether adjustable coil clamps are Details to be Provided by Supplier N/A

provided for HV and LV windings
G. Whether steel rings used for the Details to be Provided by Supplier No
windings if so, whether they are split

H. Whether electro-static shields are Details to be Provided by Supplier YES

provided to obtain uniform voltage
 I. Insulating material used for

HV winding Kraft Paper, Class A Kraft Paper, Class A

LV winding

Regulating winding

H. Insulating material used between

HV winding & LV winding Press Board, Oil, Spacers, Ducts Press Board, Oil, Spacers, Ducts

LV winding & core

Regulating winding and earth

I. Type of axial coil supports

HV winding Axial support of Press Board Axial support of Press Board

LV winding

J. Type of radial coil supports

HV winding Radial support of Press Board Radial support of Press Board

LV winding

45. Bushings: HV & HV Neutral LV

A. Make and type CJI/WS/JAYSHREE CJI/WS/JAYSHREE CJI/WS/JAYSHREE CJI/WS/JAYSHREE

B. Rated voltage class kV 12(HV) 3.6KV 12(HV) 3.6

C. Rated current (Amps.) Vendor shall be furnished 4000A 250 A 2000

D. Lightning impulse withstand test Vendor shall be furnished 20 75 KVP 20 KVP

voltage

E. Power frequency withstand test 28 KVRMS 10 KV RMS

voltage
Wet for 1 minute (kV rms) Vendor shall be furnished 10 10

Dry for 1 minute (kV rms) Vendor shall be furnished 10 10

K. Whether test tap is provided N.A.

L. Quantity of oil in bushing and Details to be Provided by Supplier N/A

specification of oil
used (Ltrs)
M. Weight of assembled bushing (kg) Details to be Provided by Supplier 5 kg

N. Free space required at top for Details to be Provided by Supplier 320 mm

removal of bushing
46. Minimum clearance (mm) In Oil HV LV

Phase to Phase Adequate for the test voltages 28 mm

Phase to Ground Adequate for the test voltages 28 mm

47. Minimum clearance (mm) in Air HV LV

Phase to Phase Vendor shall be furnished Vendor shall be furnished 130 25

Phase to Ground Vendor shall be furnished Vendor shall be furnished 80 20

48. Approximate weight

A. Core steel in Kg Details to be Provided by Supplier 2000

B. Coil with insulation in Kg Details to be Provided by Supplier 1050

 C. Core and winding in Kg Details to be Provided by Supplier 3050

D. Weight of Copper used for above Details to be Provided by Supplier 910

Trafo. In Kg
E. Oil required for first filling in Kg Details to be Provided by Supplier 2210

F. Fittings & accessories in Kg Details to be Provided by Supplier 700

G. Tank and fittings with accessories Details to be Provided by Supplier 2100

in Kg
H. Un tanking weight in Kg Details to be Provided by Supplier 4400

I. Total weight with oil and fittings Details to be Provided by Supplier 7540
in Kg
49. Oil Synthetic Ester Oil Synthetic Ester Oil

A.Governing standard Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

B. Specific resistance at Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

27°C (Ohms-cms) Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

90°C (Ohms-cms) Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

C. Tan delta Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

D. Water content Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

E.Dielectric strength (Break down Details to be Provided by Supplier AS PER STANDARD & As per supplier TC
voltage) (KV)
F. Characteristic of oil after ageing test Details to be Provided by Supplier AS PER STANDARD & As per supplier TC
as per ASTM
Specific resistance at 27°C Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

Tan delta Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

Sludge content Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

Neutralisation number Details to be Provided by Supplier AS PER STANDARD & As per supplier TC

50. G. Details oil preserving equipment Silica Gel Breather Silica Gel Breather
offered
51. Radiator

No. of banks attached whether attached Details to be Provided by Supplier 4 Set /Attached seperately
/ separate
Overall dimensions of radiator bank Details to be Provided by Supplier 1200 X 520
(lxbxh) (mm)
Total weight with oil required for Details to be Provided by Supplier 586
Radiator (kg)
Total weight without oil (kg) Details to be Provided by Supplier 396

Thickness of radiator tube (mm) 1 1 mm

Type of mounting Details to be Provided by Supplier Tank Mounted

Vacuum withstand capability Full Vacuum DDE

Whether Radiator bank is suitable for 2 Details to be Provided by Supplier 110 % Loading
x 100% Capacity
52. Gas and oil operated relay make and Atvus / I&C / Press-N- forge or Equiv, Doublefloat type Atvus / I&C / Press-N- forge or Equiv, Doublefloat type
type
53. Magnetic oil level gauge make and type I & C / Sukrut or Equiv. I & C / Sukrut or Equiv.

54. Temperature controllers

Make and type Precimeasure / Perfect Control or Equivalent Precimeasure / Perfect Control or Equivalent

Permissible setting ranges for alarm o

0-150 C 0-150 C
o

and trip
Number of contacts Two for OTI & Four for WTI Two for OTI & Four for WTI
 Current rating of each contact 5A AC/DC 5A AC/DC

Diameter of the dial 150 mm 150 mm

55. Minimum clearance height for Details to be Provided by Supplier 3200 mm

lifting core and winding from tank
cover : mm
56. Minimum clearance height for lifting Details to be Provided by Supplier 1100 mm
tank cover: mm

57. Shipping details

Approximate weight of heaviest Details to be Provided by Supplier 6700

package : kg
Approximate dimension of largest Details to be Provided by Supplier 3700 X 2100 X 1900
package : l x b x h
Transformer will be transported with oil/ Details to be Provided by Supplier OIL
N2 Gas
58. Quantity of Transformer oil to be Details to be Provided by Supplier 250 Ltrs
used (K.litres) (including cooling
system, OLTC and conservator)
59. Overall dimensions Details to be Provided by Supplier

60. Length (mm) Details to be Provided by Supplier 3900 mm

61. Breadth (mm) Details to be Provided by Supplier 3150 mm

62. Height (mm) from Plinth level to Top of Details to be Provided by Supplier 2800 mm
bushings
63. STC Rating of Transformer 40KA for 1 Sec 25KA for 2 Sec

64. Creepage Distance 31mm/kv 31mm/kv

65. Corrosion Category C4 Environment (Painting coating thickness shall C4 Environment (Painting coating thickness shall
be 220 Microns) be 220 Microns)
One coat of Zinc Rich Primer(60 Microns), One One coat of Zinc Rich Primer(60 Microns), One
Coat of MIO(100 Microns) and Final PU Paint(60 Coat of MIO(100 Microns) and Final PU Paint(60
Microns). Coating of Main tank & Microns). Coating of Main tank &
Radiator shall be 220 Microns Radiator shall be 220 Microns
66. CCA NA NA

67. BCTs NA NA

68. Accessories

Oil conservator with filler cap and aircell. Yes Yes

Drain plug and plain and dial type oil level
gauge.
Cobalt free Silica gel breather with
Yes Yes
connecting pipe and oil seal. (Height of the
same shall be 500 mm. from centre of
roller).
Yes Yes
Air release devices.

100 mm dial magnetic oil level gauge with Yes Yes

low level alarm contacts.

Also, Prismatic oil level gauge for Yes Yes

conservator of diverter switch compartment
150 mm dial Oil Temperature Indicator Yes Yes
(OTI) with maximum reading pointer and
electrically separate contacts for trip and
alarm. OTI shall have accuracy class of ±2
deg.
150 mm dial Winding Temperature Indicator Yes Yes
(WTI) with maximum reading pointer and
resetting device & electrically separate sets
of contacts for trip and alarm for HV and LV
Winding temperature transducer repeater
for remote indication to plant control &
monitoring system.
WTI shall have accuracy class of ±2 deg.

Thermometer pockets (for Oil & Winding Yes Yes

temperature).
Double float Buchholz relay (Reed type) with Yes Yes
gas release cock, shut‐off valve on either
side and separate sets of contacts for trip
and alarm and having provision for
collecting gas at ground level
Pad lock for each manually operated Yes Yes
tapping switch & valves.
Drain valve/sludge removal valve at the Yes Yes
bottom most point of the tank, shut off
valves, bottom oil sampling valves and top
and bottom filter valves.
Anti-Earth quack clamp Jacking pads and Yes Yes
haulage lugs, handling and lifting lugs.

Yes Yes
Cover lifting eyes

Under-carriage fitted with Flat Bi directional Yes Yes

rollers and skids with padlocking facility.

Hand hole of sufficient size for access to Yes Yes

interior of the tank and Inspection covers at
suitable accessible location.

Four Earthing terminals. Yes Yes

Weather-proof marshalling box for housing Yes Yes

control equipment and terminal connections
with padlocking facility.

Rating, diagram and tap connection plate Yes Yes

(Material – SS)

Terminal Marking plate.

Yes Yes
Pressure Relief Valve (PRV) with an Trip Yes Yes
contact and with suitable discharge
arrangement for oil. (Minimum 2Nos.)
Yes Yes
Valve Schedule plates (Material - SS).
 Retention tank in case of oil leakage.
Yes Yes

Internal protection relay for gas, high Yes Yes

pressure & high temp.

Bolts & nuts (exposed to atmosphere) shall Yes Yes

be hot dip galvanized steel/SS.

Rain hoods to be provided on Buchholz, Yes Yes

MOG & PRD. Entry points of wires shall be
suitably sealed.
Radiator bank complete with air release Yes Yes
plug, drain plug and isolating valves at
points of connection with tank. Radiator
thickness shall not be less than 1.2 mm.

Additional Bushing for grounding harmonic Yes Yes

shield outside tank.
Yes Yes
Bushings for HV, LV terminals including
Neutral & Shield Bushings. Shield Bushings
shall be provided with 50X6 GI Bus Bar with
1.1 KV grade support insulators (3 Nos.)
etc. up to below 300 from roller level.

Valves for interconnection with NIFPS Yes Yes

arrangement shall be in bidder’s scope. The
location and size of valve shall be subject to
SW approval.
Yes Yes
Required No. cable supports for HV & LV
cable boxes and Radiators.

69.
Fittings

1. MOG Yes Yes

Yes Yes
2. Buchholz Relay

3. OTI/ WTI (with digital signals for Yes Yes

monitoring through SCADA)
Yes Yes
4. Oil Temperature -Analog signals for
monitoring through SCADA

Yes Yes
5. Winding Temperature -Analog signals
for monitoring through SCADA

Yes Yes
6. PRV (digital signals for monitoring
through SCADA)

70 Routine Tests as per IEC60076 /IS 2026

Tank Pressure Test As per CBIP As per CBIP

As per CBIP As per CBIP

Tank Vaccum Test

Test to be conducted on each of the

Transformer as per agreed QAP/ITP as per
IEC/IS
Type Test reports of similar rating /type (same NOTED
voltage & impedance) transformer shall be
71. Type Test
submitted.
Note: Any type test/special test mutually agreed
Special Test Report for Dynamic Short Circuit NOTED
72. Special Test Withstand Capacity of similar rating/type (same
kVA, voltage & impedance) transformer shall be
submitted
Painting shall be suitable for corrosion category NOTED
C4 and shall be done as per ISO 12994.
All external surfaces shall be given three coats of
73. Paint paints except for nuts, bolts and washers which
may be given one coat after erection. The final
coat shall be a glossy oil and weatherproof, non-
fading paints of shade 631 of IS: 5
Note: a) Type Test Report of Similar rating or higher rating to be provided
b) QAP with Stage Inspection(Core Assembly, Winding Assembly, Core Coil Assembly, PTVT
Test and