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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF TRANSFORMER
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
Transformer BAY NO: EQUIPMENT IDENTIFICATION NO: DATE OF TESTING:
Transformer Type: 2 Winding ICT
Voltage level, kV 132/33 220/132 220/132/11 400/220/33
Current (HV side): Current (LV side): Current (Tertiary):
MVA RTING:
A. CHECK LIST OF ELECTRICAL TESTS CARRIED OUT FOR TRANSFORMER
Sl.No Name of Tests Performed (Yes/No)
Test Results OK/Not OK
1 Insulation resistance measurement 2 Vector group test & polarity check
3 Short circuit impedance test 4 Magnetic balance test 5 Floating neutral voltage measurement 6 Magnetisation current test 7 Voltage ratio test 8 Insulation resistance measurements of bushing CT
9 Continuity Test of Bushing CTs 10 Secondary winding resistance of bushing CT
11 Polarity Test of Bushing CTs
12 Current Ratio test 13 Magnetising curves performance 14 Contact Resistance measurement 15 TAN DELTA & CAPACITANCE Measurement of Bushings
16 TAN DELTA & CAPACITANCE Measurement of WINDINGS
17 Protection and alarm tests 18 Stability test of Differential and REF protection
19 Frequency Response Analysis 20 Measurement of Winding Resistance
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Signature: Signature: Signature: Signature Name: Name: Name: Name: Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
B. CHECKS AFTER RECEIPT OF TRANSFORMER AT SITE:
a. N2 PRESSURE & DEW POINT RECORD
Description N2 Pressure Dew Point Ambient Temp Remarks During Dispatch at factory After receipt at site
DURING STORAGE AT SITE BEFORECOMM.
NOTE: N2 pressure and dew point should be within permissible range as per graph provided by manufacturer. During storage at site, dew point has to be measured whenever any drop in N2 pressure is observed. During storage at site before commissioning, N2 pressure has to be measured daily and record to be maintained in a separate sheet.
b. IMPACT RECORER ANALYSIS
RECEIVED IN HEALTHY CONDITION AT SITE
STATUS BRIEF ANALYSIS Yes No
Analysis report Received from Manufacturer Before starting of erection
Yes No
Note: Impact Recorder should be detached from the Transformer/ Reactor preferably when the
main unit has been placed on its foundation.
c. CORE INSULATION CHECK
INSULATION VALUE Between CCG Between CLG Between CCCL (Recommended value > 10 M Ohms)'
Note: Shorting link between CC, CL & G to be removed and IR value to be taken between CCG, CLG
& CCCL.
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C. CHECKS/ PRECAUTIONS DURING ERECTION
i) Active part of transformer should minimum exposed to atmosphere
ii) During exposure of active part of transformer to atmosphere:
DRY AIR GENERATOR/ DRY AIR CYLINDERS USED :
Yes No Remarks
iii) WHILE ENTERING IN TRANSFORMER TANK, CHECK AVAILABILITY OF PROPER OXYGEN
TRANSFORMER KEPT SEALED WITH N2 IN BETWEEN DIFFERENT ERECTION ACTIVITIES
Yes No Remarks
D. PRECOMMISSIONING CHECKS:
Sl No
DESCRIPTION STATUS REMARKS Yes No RECORD DEFICIENCIES, IF ANY
1. Transformer and its auxiliaries are free from visible defects on physical inspection
2. All fittings as per out line general arrangement drawing.
3. Check main tank has been provided with double earthing
4. Check neutral is grounded through separate connections. Ensure metallic requirements as per specification in earthing strips used
5. Check that Marshalling box, OLTC driving gear, Diverter, Radiator bank, Pump & Fan motor etc has been earthed
6. All nuts and bolts are tightened correctly as per specified torque (as per manufacturers recommendation)
7. Check tightness of terminal connectors 8. Check levelling of transformer and its
accessories 9. Erection completion certificate along with
list of outstanding activities reviewed 10. Any paint removed / scratched in transit
has been touched up 11. Bushings are clean and free from physical
damages 12. Oil level is correct on all bushings
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13. Check hermetically sealing is intact in all bushings
14. Check oil leakage through any joints / valves etc.
15. Check oil drain valves are properly closed
and locked. 16. Check oil level in Main / OLTC
conservator tank 17. Check oil level at conservator matches
with oil temperature of transformer 18. Check gear box oil level in OLTC 19. Check OTI and WTI pockets and replenish
the oil , if required 20. check all valves for their opening &
closing sequence 21. Check the colour of breather silica gel (
blue when dry ) 22. Check availability of oil in the breather
cup 23. Check all rollers are locked and tack
welded with rails ( where ever applicable )
24. Check bushing test tap is grounded 25. Check no debris , loose T & P and oil
strains on and around the transformer 26. Check door seals of marshalling box is
intact and all cable gland plates unused holes are sealed
27. Check that pressure relief valve is correctly mounted
28. Ensure unused secondary cores of bushing CT's, if any, has been shorted
29. Check star point has been formed properly and grounded at one end only as per scheme
30. Check that permanent and adequate lightning arrangements are ready
31. Check that labelling and identification is permanent and satisfactory
32. Check that buchholz relay is correctly mounted with arrow pointing towards conservator
33. Check cables are properly fixed and ensure cable entry at the bottom
34. Ensure all power and control cable terminals are tightened
35. Check all cables and ferrules are provided with number as per cable schedule (cross feruling to be Checked)
36. Check that all cables are correctly glanded
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37. Check external cabling from junction box to relay / control panel completed
38. Check that air has been released from the radiators and their headers / OLTC buchholz relay /Main tank / tank/
bushing turrets etc. 39. Check fire protection system & is
adequate & ready 40. Check that CCCL& G are shorted 41. Check that all radiator bank valves on top
and bottom headers are open 42. Change over operation of ac supply from
Source i to Source ii checked 43. Check the flanges of bushing &
OLTC for any crack after fixing 44. Check various interlocks provided with
fire fighting as per the schematic ref. Drg no :__________
DESCRIPTION OF INTERLOCKS CHECKED
E. MEASUREMENT OF EARTH RESISTANCE OF ELECTRODE
LOCATION 1 2 3 4 VALUE (Before connection to grid) VALUE (After connection to grid)
NOTE: Value of Earth Resistance< 1.0 OHM
F. CALIBRATION OF OTI & WTI PERFORMED AS PER PROCEDURE: Yes No
G. DETAILS OF RELAYS/ CONTACTORS USED: SCHEMATIC DRAWING NO.: __________________
Circuit Reference
Make Serial No. Type Number of NO & NC contacts
Number of AI, BI & BO
NO NC AI BI+BO
H. EVACUATING AND OIL FILLING:
a) Before filling oil, each drum has been physically checked for free moisture and
appearance: Yes No
b) OIL FILTER MACHINE:
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i). Capacity : ii). Make : iii). Lubricating oil of vacuum pump changed or not : iv). Filter Packs cleaned or not : v). Whole filter machine flushed with fresh oil or not : vi). Vacuum obtained without load (milli bar) :
c) VACUUM PUMP FOR EVACUATION OF TRANSFORMER:
i). Lubricating Oil changed or not : ii). Vacuum obtained without load (milli bar) : iii). Diameter of vacuum hose (50 mm) : iv). Dry ice chamber employed or not :
d) OIL STORAGE TANK:
i). Inside painted or not : ii). Silica gel breather provided or not : iii). Any opening left uncovered : iv). Capacity of Storage tank (KL) : v). Cleanliness of inside of pipes/ hoses to the storage tank :
e) EXPOSURE DURING ERECTION:
i). Exposure hours during First day, Number of Hours: : a. N2 filled pressure (PSI or Bar) :
b. Number of Hours under N2 : c. Ambient temperature : d. Relative Humidity : e. Weather (sunny/cloudy/stormy/rainy) :
ii). Exposure hours during Second day, Number of Hours: : a. N2 filled pressure (PSI or Bar) : b. Number of Hours under N2 : c. Ambient temperature : d. Relative Humidity : e. Weather (sunny/cloudy/stormy/rainy) :
iii). Exposure hours during Third day, Number of Hours: : a. N2 filled pressure (PSI or Bar) : b. Number of Hours under N2 : c. Ambient temperature : d. Relative Humidity : e. Weather (sunny/cloudy/stormy/rainy) :
f) N2 SEALING IN CASE OF DELAY IN OIL FILLING:
a. No. of Cylinders used for displacing the air inside the tank: b. N2 admitted from bottom valve
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a. Valve at diametrically opposite end at top kept open: b. No. of Cylinders used for building up 2 PSI (0.14 kg/cm 2)
Inspection Item Date Time Checked Remarks 1. Tightness test a. Start evacuating on complete unit b. Stop evacuating at 3 mbar c. Pressure P1 in kPa, 1 hour after stop
evacuating d. Pressure P2 in kPa, 0.5 hrs after
reading P1 e. Leakage = (P2P1)X V= If >3.6, continue
evacuating, V is the volume of oil as per name plate.
2. VACUUM a. Pressure 0.13 kPa (1.3 mbar) reached b. Vacuum kept for Upto 145 kV, 12 Hour 145 kV & upto 220 kV, 24 Hours 3. OIL FILLING a. Oil filling is made b. Oil Conservator with Air Cell c. OLTC 4. STANDING TIME Upto 145 kV, 12 Hours 145 kV & upto 220 kV, 48 Hours
G) RECORD OF DRYING OUT PROCESS:
Drying out started on: Date: Time: Ambient Temp:
(Hourly reading to be taken)
Date Time Vacuum reading in
Filtration machine
Vacuum reading In transformer
Tank
OTI OF TANK
Condensate Collected total
/Rate
Remarks & sign of supervising
Engineer
Record of filtration and Dry out shall be kept in a register and shall be made a part of the Pre commissioning document.
H) INSULATION RESISTANCE MEASUREMENT: (USING 500 V MEGGER):
Megger details:
Validity of Calibration:
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Ambient temperature:
Sl No Description Status Remarks, if any Yes No
A Control Wiring
B Tap Cganger Motor Control wiring
C Cooling System Fan Motor Pump Motor Control Wiring
NOTE: IR values should be > 50 M for cables
I) INSULATION RESISTANCE MEASUREMENT: (USING 5000 V MEGGER):
Megger details:
Validity of Calibration:
Ambient temperature: Temperature of OIL:
Main Winding IR Value (M) AI=60ss/15 s PI=600s/60 s Temp. 15 Sec 60 Sec 600 sec
Auto Transformer HV+IV to LV HV+IV to E
LV to E 2 Winding Transformer HV to E LV to E HV to LV
J) VECTOR GROUP TEST & POLARITY CKECKING
CONNECT NEUTRAL POINT WITH EARTH, JOIN 1RI AND 3 RI TERMINALS, APPLY 415V, 3PHASE SUPPLY TO HV TERMINALS
Terminal Voltage Measured Remarks 1R1 1Y1 1Y1 1B1 1B1 1R1 3B1 1B1 3B1 1Y1 3R1 N 3Y1 N 1R1 N 2R1 N
2 Y1 N 2 B1 N
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ENSURE 2R1 N = 2Y1 N = 2B1 N = CONSTANT
AS 3R1 N > 3B1 N > 3Y1 N, AND 3Y1 1B1 > 3B1 1B1
VECTOR GROUP Ynaod1 IS CONFIRMED AND POLARITY VERIFIED
K) MEASUREMENT OF WINDING RESISTANCE (IN OHM)
Winding Resistance meter detail:
Validity of calibration:
Ambient Temperature: OTI reading: WTI reading:
i). HV Side Measurement
Tap position
Wdg. Resistance, HVN Resistance at 75 0C Factory Value at 75 0C
Remarks
1R12R1 1Y12Y1 1B12B1 R Y B R Y B 1 2 3 4 5 6 7
8 9b 10 11 12 13 14 15 16 17
Factory Test Report Ref. NO:
ii). INTERMEDIATE VOLTAGE SIDE:
Between Winding Resistance At Site
Resistance at 75 0C Remarks Site Factory
2R1 N 2Y1 N 2B1 N
iii). LOW VOLTAGE SIDE:
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Between Winding Resistance At Site
Resistance at 75 0C Remarks Site Factory
3R1 N3B1 3Y1 3R1 3B1 3Y1
NOTE: LV WINDING RESISTANCE AT FACTORY MEASURED WITHOUT FORMATION OF DELTA. HOWEVER MEASUREMENTS CARRIED OUT AT SITE ARE AFTER FORMATION OF DELTA. HENCE A CORRECTION FACTOR OF 1.5 TIMES TO BE APPLIED IN SITE RESULTS.
L) MAGNETIC BALANCE TEST:
Apply single phase 230 V across one phase of HV winding terminal and neutral then measure voltage in other two HV terminals across neutral. Repeat the test for each of the three phases.
Apply 1ph, 230V AC across (1) Voltage measured in Volts Remarks Between (2) Between (3) 2R1 N 2Y1 N 2B1 N 2Y1 N 2R1 N 2B1 N 2B1 N 2Y1 N 2R1 N
M) FLOATING NEUTRAL VOLTAGE MEASUREMENT
Disconnect the transformer neutral from the ground
Apply 3 phase 415 volts to the high voltage winding and make the measurement in the IV winding
with respect to neutral and neutral point to ground.
Tap Position HV Winding Voltage Applied
IV Winding Voltage Measured
Remarks, if any
Normal ( ) 1R N 2R N Normal ( ) 1Y N 2Y N Normal ( ) 1B N 2B N
N Earth
Apply 3 phase 415 volts to the intermediate voltage winding and make the measurement in the
tertiary winding with respect to neutral and neutral point to ground.
IV Winding Voltage Applied LV Winding Voltage Measured
Remarks, if any
2R N 3R N 2Y N 3Y N 2B N 3B N
N Earth
Check: After the test, neutral reconnected to Ground : Yes / No
N) MAGNETISATION CURRENT TEST:
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Testing Instrument detail:
Testing Instrument Calibration valid or not:
Ambient temperature at the time of test:
Temperature of OIL:
i). APPLY 1PHASE AC SUPPLY ON HV TERMINALS AND KEEP IV & LV OPEN Tap Position Voltage
Applied (V) Current Measured (mA)
Factory test value
Remarks
Lowest ( ) R N R ph Y N Y ph B N B ph
Normal ( ) R N R ph Y N Y ph B N B ph
Highest ( ) R N R ph Y N Y ph B N B ph
ii). APPLY 1PHASE AC SUPPLY ON IV TERMINALS AND KEEP HV & LV OPEN Tap Position Voltage applied
(Volts) Current measured in LV side (mAmps)
Remarks
Normal ( ) 2R N 2Y N 2B N
P) VOLTAGE RATIO TEST:
Testing Instrument (TRM) detail: Testing Instrument Calibration valid or not: Ambient temperature at the time of test: Temperature of OIL:
i). Ratio HV / IV
Tap
Pos
Voltage applied Voltage measured Ratio Factory Ratio
1RN 1YN 1BN 2RN 2YN 2BN R Y B R Y B 1 2 3 4 5 6 7 8 9 10 11 12
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13 14 15 16 17
ii). RATIO : HV / LV
Tap Position
Voltage applied Voltage measured Ratio Factory Ratio 1RN 1YN 1BN 3RN 3YN 3BN R Y B R Y B
Lowest Normal Highest
iii). RATIO : IV / LV
Tap Position
Voltage applied Voltage measured Ratio Factory Ratio 2RN 2YN 2BN 3RN 3YN 3BN R Y B R Y B
Lowest
Q) OIL CHARACTERISTICS:
Date: Time: Ambient Temp:
OTI reading: WTI reading:
Sample to be collected before Charging & following value to be achieved:
BDV: Min 70 kV
Moisture in PPM: Min 10
Tan delta (90 0C): Max 0.1
Resistivity: Min 6 x 10 12 Ohm cm
Interfacial Tension at 27 0C: Min 0.035 N/m
OIL Sample BDV (kV) Moisture (PPM)
Tan delta Resistivity (Ohm cm)
Inter facial tension (N/m)
Remarks
Main Tank Top Bottom OLTC
R) DISSOLVE GAS ANALYSIS
DISOLVE OIL SAMPLE SCHEDULE
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GASES Before Charging
24 Hrs After Charging
7 Days After Charging
15 Days After Charging
01 Month After Charging
03 Month After Charging
Total Gas% H2
CH4 C2H4 C2H6 C2H2 CO CO2 O2 N2
S) Test on OLTC:
Sl No
Description Status Remarks OK Not OK
1 Visual inspection of equipment 2 Manual operation on all taps ( local ) with confirmation
of the no. of revolutions and Locking at extreme taps 3 Over load device of driving motor 4 Local operation (Electrical) 5 Remote operation (Electrical) 6 Tap position indicator 7 Check operation with Master Follower scheme ( parallel
operation ) 8 Out of step relay 9 Step by Step Contactor 10 Limit Switch 11 Winding resistance at all taps 12 Continuity test of winding during one Complete cycle of
operation
T) OPERATIONAL TEST OF OTHER EQUIPMENTS
i). CHECKING OF COOLING EQUIPMENTS a) Rotation Direction of Pumps: OK Not Ok b) Rotation Direction of Fans: OK Not Ok
ii). PROTECTION CHECKS Eqpt. Fan No
Setting Value Pickup Value Single Phasing Prevention check
1 2 3 4
5 6
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7 8 9 10 11
12 Pump No 1 2 3 4
U) INSULATION RESISTANCE MEASUREMENT OF BUSHING CTs: (USING 500V MEGGER)
Between HV IV Neutral LV
Rph Yph Bph Rph Yph Bph Rph Yph Bph Earth Core I Earth Core II Earth Core III Earth Core IV Core I Core II Core I Core III Core I Core IV Core II Core III Core II Core IV Core III Core IV
V) CONTINUITY TEST OF BUSHING CT's
Core Between Terminal
HV IV Neutral LV Rph Yph Bph Rph Yph Bph Rph Yph Bph
Core I 1S11S2 Core II 2S12S2 Core III 3S13S2 Core IV 4S14S2
W) SECONDARY WINDING RESISTANCE OF BUSHING CT's (IN OHM)
i). HV SIDE
Core Between RPhase () YPhase( ) BPhase( ) Terminal Factory Site Factory Site Factory Site
COREI 1S11S2 COREII 2S12S2 COREIII 3S13S2 COREIV 4S14S2
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ii). IV SIDE
Core Between RPhase () YPhase( ) BPhase( ) Terminal Factory Site Factory Site Factory Site
COREI 1S11S2
COREII 2S12S2 COREIII 3S13S2 COREIV 4S14S2
iii). LV SIDE
Core Between RPhase () YPhase( ) BPhase( ) Terminal Factory Site Factory Site Factory Site
COREI 1S11S2 COREII 2S12S2 COREIII 3S13S2
COREIV 4S14S2
iv). NEUTRAL SIDE
Core Between NEUTRAL () Terminal Factory Site
COREI 1S11S2
X) POLARITY TEST OF BUSHING CT's : (With 1.5 V DC Supply)
i). POLARITY OF HV & IV BCT
CORE Between HV IV RPH YPH BPH RPH YPH BPH
COREI 1S1(+ve) 1S2(ve) COREII 2S1(+ve) 2S2(ve) COREIII 3S1(+ve) 3S2(ve) COREIV 4S1(+ve) 4S2(ve)
ii). POLARITY OF LV & Neutral BCT
CORE Between LV Neutral RPH YPH BPH
COREI 1S1(+ve) 1S2(ve) COREII 2S1(+ve) 2S2(ve) COREIII 3S1(+ve) 3S2(ve) COREIV 4S1(+ve) 4S2(ve)
Y) CURRENT RATIO TEST: Measure current on secondary terminals
i). R PHASE: HV SIDE
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iv). R PHASE: IV SIDE
CORE
S1 S2
Primary
%
Current
Actual
Secondary
Current
Theoretical
Ratio
Actual
Ratio
%
Error COREI (1S11S2)
20% 40% 80%
COREII (2S12S2)
20% 40% 80%
COREIII (3S13S2)
20% 40% 80%
COREIV
(4S14S2)
20%
40% 80%
v). Y PHASE: IV SIDE
CORE S1 S2
Primary %
Current Actual
Secondary Current
Theoretical Ratio
Actual Ratio
% Error
COREI (1S11S2)
20% 40% 80%
COREII (2S12S2)
20% 40% 80%
COREIII (3S13S2)
20% 40% 80%
COREIV (4S14S2)
20% 40% 80%
vi). B PHASE: IV SIDE
CORE S1 S2
Primary %
Current Actual
Secondary Current
Theoretical Ratio
Actual Ratio
% Error
COREI (1S11S2)
20% 40% 80%
COREII (2S12S2)
20% 40% 80%
COREIII (3S13S2)
20% 40% 80%
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COREIV (4S14S2)
20% 40% 80%
Z) MAGNETISING CURVES PERFORMANCE:
(NOT TO BE DONE FOR METERING CORE)
KNEE POINT VOLTAGE (KVP) =
i). R PHASE: HV SIDE VOLTAGE CURRENT MEASUREMENT (mA) To be applied Actual
Value COREI COREII COREIII COREIV 1S11S2 2S12S2 3S13S2 4S14S2
0.25 x KVP 0.50 x KVP 0.75 x KVP
1.00 x KVP 1.10 x KVP
ii). Y PHASE: HV SIDE VOLTAGE CURRENT MEASUREMENT (mA) To be applied Actual
Value COREI COREII COREIII COREIV 1S11S2 2S12S2 3S13S2 4S14S2
0.25 x KVP 0.50 x KVP 0.75 x KVP 1.00 x K
VP 1.10 x KVP
iii). B PHASE: HV SIDE VOLTAGE CURRENT MEASUREMENT (mA) To be applied Actual
Value COREI COREII COREIII COREIV 1S11S2 2S12S2 3S13S2 4S14S2
0.25 x KVP 0.50 x KVP 0.75 x KVP
1.00 x KVP 1.10 x KVP
iv). R PHASE: IV SIDE VOLTAGE CURRENT MEASUREMENT (mA) To be applied Actual
Value COREI COREII COREIII COREIV 1S11S2 2S12S2 3S13S2 4S14S2
0.25 x KVP 0.50 x KVP 0.75 x KVP 1.00 x KVP 1.10 x KVP
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2 kV HVIV/LV+G GST 10 kV 2 kV HVIV/LV
with Guard GSTg
10 kV 2 kV LV/HVIV+G GST
10 kV 2 kV LV/HVIV
with Guard GSTG
10 kV
AD) SHORT CIRCUIT IMPEDANCE TEST
Testing Instrument detail:____________________________________________________
Testing Instrument Calibration valid or not: ___________________
Ambient temperature at the time of test: _______________
Temperature of OIL: __________________
i). HV TO IV
Tap No.
1U1 (R) 1V1 (Y) 1W1 (B) (IV OF R AND N SHORTED, LV OPEN)
(IV OF Y AND N SHORTED, LV OPEN)
(IV OF B AND N SHORTED, LV OPEN)
Voltage (V) Current (A) Voltage (V) Current (A) Voltage(V) Current(A) LOWEST NORMAL HIGHEST
ii). IV TO LV (NORMAL TAP) SUPPLY SHORT ALL 3 LV
BUSHINGS, HV OPEN SHORT ALL 3 LV BUSHINGS, HV OPEN
SHORT ALL 3 LV BUSHINGS, HV OPEN
2U1 N ____________A 2V1N _____________A 2W1 N ____________A
iii). HV TO LV (NORMAL TAP) SUPPLY SHORT ALL 3 LV
BUSHINGS, HV OPEN SHORT ALL 3 LV BUSHINGS, HV OPEN
SHORT ALL 3 LV BUSHINGS, HV OPEN
1U1 N ____________A 1V1N _____________A 1W1 N ____________A
AT LOWEST TAP SUPPLY SHORT ALL 3 LV
BUSHINGS, HV OPEN SHORT ALL 3 LV BUSHINGS, HV OPEN
SHORT ALL 3 LV BUSHINGS, HV OPEN
1U1 N ____________A 1V1N _____________A 1W1 N ____________A
AT HIGHEST TAP
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b. Source
c. Pickup
d. Slope
e. Pickup Delay
f. Reset Delay
iii). OVER FLUXING PROTECTION:
OVER FLUXING SETTINGS:
a. Function Enabled
b. Source
c. Pickup
d. Curves
e. TD Multiplier
f. T Reset
iv). BACK UP PROTECTION:
LV Side:
a. Over current Settings:
PS TMS HS
__________ ______ _________
b. Earth Fault Settings: PS TMS HS
__________ ______ _________
HV SIDE:
c. Over current Settings:
PS TMS HS
__________ ______ _________
d. Earth Fault Settings:
PS TMS HS
__________ ______ _________
AG) STABILITY TEST OF DIFFERENTIAL & REF PROTECTION: OK/ Not OK
NOTE : Prove the tripping of associated breakers by actual operation of the various devices and relays as per the schemes.
AH) FREQUENCY RESPONSE ANALYSIS (FRA)
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iii). DOCUMENTS REGARDING SPARES, EQUIPMENT, O & M MANNUALS ETC AVAILABLE AT SITE FOR O & M PURPOSE: YES / NO
iv). AFTER MODIFICATION, IF ANY, "AS BUILT DRAWINGS" ARE AVAILABLE AT SITE: YES / NO
Signature: Signature: Signature: Signature Name: Name: Name: Name: Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF ISOLATOR AND GROUND SWITCH
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
BAY NO: DATE OF TESTING:
EQUIPMENT SERIAL NO : RPhase___________ YPHASE____________B PHASE______________
Type: MAKE:
Voltage level, kV 33 132 220 400
Current Carrying Capacity: ___________A
Type of Operating Mechanism:
Control Voltage:______________Volt DC
1) DETAILS:
SL
No
DESCRIPTION STATUS REMARKS, IF
ANY
YES NO
1. Equipment is free from dirt/dust Foreign materials
etc.
2. Equipment is free from all visible defects on physical
inspection
3. Support structures, marshalling box Has been
provided with two earthing Pads / points
4. All nuts and bolts are tightened correctly as per
specified torque
5. Equipment erection is complete in all respect as per
instruction manual (attach remaining activities, if
any)
6. Permanent isolator levelling and identification is
done
7. Levelling and alignment of structure and base frame
is checked
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8. Control box / marshalling kiosk is free from any
physical defects
9. Tightness of nuts bolts of terminal connectors are
checked
10. Auxiliary contacts and relays have been cleaned and
free from rust / damage
11. Corona rings are provided and properly fixed
12. Cable termination and tightness checked and unused
holes sealed
13. External cabling is completed in all respect
14. All the cable identification tags provided and all
cores are provided with identification ferrules at
M.B.
15. All moving parts are lubricated
16. Alignment of isolator already made and locking bolt
provided, if any
17. Freeness of manual operation is OK
18. Greasing has been made on the main contacts
according to the manufacturers instruction
19. Functional checking of auxiliary Contacts for
indications and interlocks
20. Erection completion certificate along with list of
outstanding activities reviewed
21. All spare wires to be kept with ferrules but not
terminated at the terminal blocks
22. Earth switch connected to earth through braided wires
23. Interlocks checked as per approved scheme with all
combinations
24. Check that earth switch blade alignment In condition
is at sufficient distant from Isolator
25. Check that operation and positioning of the limit
switch & the auxiliary contacts assembly are ok
26. Check that all three phase isolators are Closing &
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ACROSS PHASE
RPhase ( ) YPhase( ) BPhase( )
MAIN CONTACT (MALE & FEMALE)
(GROUND SWITCH)
c) Resistance of Operating Coil ____________________
d) Resistance of Interlocking Coil ____________________
6) FINAL DOCUMENTATION REVIEW:
a) FINAL DOCUMENT OF PRECOMMISSIONING CHECKS
REVIEWED AND APPROVED: YES / NO
b) DOCUMENTS REGARDING SPARES, EQUIPMENT, O & M
MANNUALS ETC AVAILABLE AT SITE FOR O & M PURPOSE: YES / NO
c) AFTER MODIFICATION, IF ANY, "AS BUILT DRAWINGS"
ARE AVAILABLE AT SITE: YES / NO
Signature: Signature: Signature: Signature Name: Name: Name: Name: Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF WAVE TRAP
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
BAY NO: DATE OF TESTING:
EQUIPMENT SERIAL NO: RPhase___________ YPHASE____________B PHASE______________
Type: MAKE:
Voltage level, kV 132 220 400
Current rating: ___________A
mH Rating: BAND WIDTH:
1. DETAILS : CHECKLIST / TESTING
SL
No
DESCRIPTION STATUS REMARKS, IF
ANY
YES NO
1. Equipment is free from dirt/dust Foreign materials etc.
2. Equipment is free from all visible defects on physical
inspection
3. Support structures, has been provided with two
earthing Pads / points
4. All nuts and bolts are tightened correctly as per
specified torque
5. Permanent isolator levelling and identification is
done
6. Levelling and alignment of structure and base frame
is checked
7. All insulators & line matching unit are free from any
physical defects
8. Tightness of nuts / bolts of terminal connectors are
checked
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9. Erection completion certificate along with list of
outstanding activities reviewed
10. Check that the tuning unit and Arrestor are properly
tightened And free from any damage
2. INSULATION RESISTANCE MEASUREMENT:
SL
NO
BETWEEN MEGGER PHASE Permissive
Value RPHASE YPHASE BPHASE
Upper Terminal
& Earth
5000 V 1000 M
LA of the Wave Trap
500 V 1 M
3. CONTACT RESISTANCE MEASUREMENT:
THE VALUE SHOULD NOT MORE THAN 5 PER CONNECTOR / JOINT
SL
No ACROSS
PHASE
RPhase ( ) YPhase ( ) BPhase ( )
1 Upper Terminal
2 Bottom Terminal
4. FINAL DOCUMENTATION REVIEW :
a) Final document of pre commissioning checks Reviewed and Approved: YES / NO
b) Documents regarding spares, equipment, O& M Manuals etc. available at site for o & m purpose: YES / NO
c) After modification, if any, "as built drawings" are available at site: YES / NO
Signature: Signature: Signature: Signature Name: Name: Name: Name: Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF SF6 CIRCUIT BREAKER
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
BAY NAME / NO:
DATE OF ERECTION: DATE OF ENERZIZATION:
EQUIPMENT SERIAL NO: RPhase___________ YPHASE____________B PHASE______________
SERIAL NO (FOR GO TYPE):
Type: MAKE:
Voltage level, kV 33 132 220 400
Current rating: ___________A RATED BREAKING CAPACITY:
CONTROL VOLTAGE:
DETAILS : CHECKLIST / TESTING
SL No DESCRIPTION STATUS REMARKS,RECORD DEFICIENCIES, IF ANY
YES NO
1. Equipment is free from dirt/dust Foreign materials etc.
2. Equipment is free from all visible defects on physical inspection
3. Support structures, has been provided with two earthing Pads / points
4. All nuts and bolts are tightened correctly as per specified torque
5. Equipment erection is complete in all respect & erection completion Certificate along with list of Outstanding activities reviewed. (ATTACH REMAINING ACTIVITIES,IF ANY)
6. Permanent pole levelling and Identification is done
7. Levelling and alignment of structure and base frame is checked
8. Control box / marshalling kiosk is free from any
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physical defects
9. Tightness of nuts bolts of terminal connectors are checked
10. i) Auxiliary contacts and relays have been cleaned and free from rust /damage ii) All spare wires to be kept with ferrules but not terminated at the terminal blocks iii) Check all the valves in the SF6 pipe line are tightened, dilo coupling are tightened.
11. Slow and power closing operation and opening done. (wherever applicable)
12. Operating System
a) Closing
i). Hydraulic ii).
Spring
iii). Pneumatic b) Opening
i). Hydraulic ii). Spring iii). Pneumatic
12.1. HYDRAULIC SYSTEM
12.1.1. ACCUMULATOR
a) Make
b) Serial No: Rph: YPh BPh
c) Type
d) Year of Manufacture
12.1.2. PUMP DETAILS
a) Make b) Type c) Sl. No d) Volt e) Ampere f) HP/KW g) Year of Manufacture
12.1.3. DETAILS OF RELAYS/CONTACTORS USED: SCHEMATIC DRAWING NO :____________
CIRCUIT REFERENCE MAKE Serial No. TYPE NO + NC
Oil Pressure monitor
Closing lockout
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Auto reclosing lockout
General lockout
AntiPumping contactor
Pole discrepancy timer
Auxiliary
Power contactor
Others
12.1.4. OPERATION CHECK:
Date of filling hydraulic oil: ____________________
Type of hydraulic oil: _____________________
Venting of Hydraulic System is done:
a) Pump ___________________
b) Pilot Valve ___________________
c) Accumulator ___________________
d) Hydraulic Mechanism ___________________
PREFILLING PRESSURE OF N2 FACTORY TEST SITE TEST
IN ACCUMULATOR ( BAR at Deg.C) _______at 0
C ______at 0
C
Pump running time for charging
Hydraulic system from initial pressure _________ MIN ________
to working pressure
CHECKING SAFETY VALVE (OPEN/CLOSE) _________ BAR ________
HYDRAULIC PRESSURE DROP FOR 1 HR
BREAKER ON POSITION _________ BAR _______
BREAKER OFF POSITION _________ BAR _______
OIL PRESSURE MONITOR
PUMP ON / OFF BAR _________ BAR _______
PUMP RUNNING TIME _________ SEC _______
AUTO RECLOSING LOCKOUT (OIL)
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FACTORY TEST SITE TEST
PRESSURE CONTACT __________MAKE/BREAK _________ BAR _______
CLOSING LOCKOUT (OIL)
PRESSURE CONTACT __________MAKE/BREAK _________ BAR _______
GENERAL LOCKOUT (OIL)
PRESSURE CONTACT __________MAKE/BREAK _________ BAR _______
CHECKING ANTI PUMPING CONTACTOR
PRESSURE CONTACT __________MAKE/BREAK OK / NOT OK
CHECKING LOSS OF NITROGEN
PRESSURE CONTACT __________MAKE/BREAK OK / NOT OK
12.1.5. OIL PRESSURE DROP DURING OPERATIONS AND PUMP RUNNING TIME IN SECONDS
Sl
No
Description Factory Test
Value
Site Test
Value
1 Pressure before operation, BAR
Pressure after Closing operation, BAR
Pump running time, Sec
2 Pressure before operation, BAR
Pressure after Opening operation, BAR
Pump running time, Sec
3 Pressure before operation, BAR
Pressure after Close/Open operation, BAR
Pump running time, Sec 4 Pressure before operation, BAR
Pressure after Open Close Open operation, BAR
Pump running time, Sec
12.2. SPRING OPERATING SYSTEM
12.2.1. MOTOR DETAILS:
Make: Type: Serial No:
Volt: Ampere: HP/KW:
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Thermal Overload Setting:
DC current taken by Motor for charging the Spring _______________Amp
12.2.2. DETAILS OF RELAYS/CONTACTORS USED: SCHEMATIC DRAWING NO :____________
CIRCUIT REFERENCE MAKE Serial No. TYPE NO + NC
Oil Pressure monitor
Closing lockout
Auto reclosing lockout
General lockout
AntiPumping contactor
Pole discrepancy timer
Auxiliary
Power contactor
Others
12.2.3. SPRING OPERATING TIME:
TIME TAKEN BY THE SPRING TO CHARGE FULLY AFTER CLOSING OF BREAKER
DETAILS R PHASE YPHASE BPHASE
Factory Site Factory Site Factory Site Charging time
13. SF6 DENSITY MONITOR DETAILS
Quantity of SF6 Gas Filled
Make ACTUAL AS PER SPEC Remark
Model RPh YPh BPh RPh YPh BPh
Serial No Rph:
Yph:
BPh:
13.1. SF6 DENSITY MONITOR SETTINGS
PHASE DETAILS BLOCKING DEBLOCKING SF6 GAS FILLED AT
__________BAR
AT _________ 0C ON
____/_____/_____
Factory Site Factory Site
RPH Refill Alarm
Operation Block
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YPH Refill Alarm
Operation Block
BPH Refill Alarm
Operation Block
13.2. MEASUREMENT OF DEW POINT OF SF6 GAS :
SL NO Description Measured Value
Minimum value of Dew Point as
per SF6 Gas supplier/Manufacturer
of CB
NOTE: Dew point measurement of SF6 gas needs to be done pole wise in close loop method without any wastage of sf6 gas.
13.3. LEAKAGE CHECK:
Sl No Description PHASE
RPhase YPhase BPhase
A Initial filling of SF6 Gas at _____0C
(AS per Temp. correction chart) _____BAR _____BAR _____BAR
B Drop in SF6 Gas Pressure in 24 Hrs _____BAR _____BAR _____BAR
C Filling pressure at ________ 0C (After all testing)
_____BAR _____BAR _____BAR
D Additional leakage test by covering Individual joint with Polythene
Yes / No Yes / No Yes / No
14. COIL RESISTANCE MEASUREMENT:
SL NO PHASE COIL MEASURED VALUE ()
SERIES RESISTOR ()
TOTAL ()
A RPhase TRIP COIL I TRIP COIL II CLOSE COIL
B Y Phase TRIP COIL I TRIP COIL II CLOSE COIL
C BPhase TRIP COIL I TRIP COIL II CLOSE COIL
15. CIRCUITARY / OPEARTIONAL CHECKS:
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SL NO CIRCUIT REFERENCE CIRCUITRY CHECK OPERATIONAL CHECK LOCAL REMOTE LOCAL REMOTE
A Tripping through TCI B Tripping through TCII C Closing circuit
D ANTI PUMPING OPERATION (Close Open operation)
E POLE Discrepancy feature F Breaker Position Indication G Heater in Switch Cubicle H Heater in Control Cubicle I Illumination in Switch Cubicle J Illumination in Control Cubicle
NOTE : In case wiring for remote operation is not ready, please indicate terminal number along
with wire ferrule number in switch cubicle where remote cables shall be terminated. Remote operation can be checked from these terminals.
16. OPERATING TIME ( IN MILLISECONDS ):
PHASE BREAK CLOSE OPEN CLOSE OPEN USING TRIPI TRIPII TRIPI TRIPII
RPH Main Contact BREAKI RPH PIR
AUXILIARY Contact RPH Main Contact
BREAKII RPH PIR AUXILIARY Contact YPH Main Contact
BREAKI YPH PIR AUXILIARY Contact YPH Main Contact
BREAKII YPH PIR AUXILIARY Contact BPH Main Contact
BREAKI BPH PIR AUXILIARY Contact
BPH Main Contact BREAKII BPH PIR AUXILIARY Contact
17. IR VALUE OF CONTROL CIRCUIT: (Use 500 V Megger)
Before Meggering isolate DC for Trip Coil I & II and Closing Coil
COIL DETAIL MEASURED VALUE (M)
RPhase Trip Coil I
RPhase Trip Coil II
RPhase Closing Coil II
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YPhase Trip Coil I
YPhase Trip Coil II
YPhase Closing Coil II
BPhase Trip Coil I
BPhase Trip Coil II
BPhase Closing Coil II
18. IR VALUE WITH BREAKER OPEN: (Using 5000 V Megger)
ACROSS OPEN CONTACT MEASUREMENT VALUE (M) RPhase Break I RPhase Break II YPhase Break I YPhase Break II BPhase Break I BPhase Break II
19. IR VALUE WITH RESPECT TO EARTH WITH BREAKER CLOSED, EARTH SWITCH AND ISOLATOR
OPEN : (USING 5000 VOLT MEGGER)
BETWEEN MEASUREMENT VALUE (M)
RPHASE and EARTH
YPHASE and EARTH BPHASE and EARTH
20. MINIMUM PICKUP VOLTAGE OF COILS:
COIL DETAILS MEASUREMENT VALUE (V) RPhase Trip Coil I RPhase Trip Coil II
RPhase Closing Coil
YPhase Trip Coil I YPhase Trip Coil II
YPhase Closing Coil BPhase Trip Coil I
BPhase Trip Coil II
BPhase Closing Coil
21. GRADING CAPACITOR:
21.1. DETAILS
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DETAILS INTERRUPTER 1 INTERRUPTER 2
R Y B R Y B
MAKE
Serial No.
Capacitance value
Year of Manufacture
21.2. CAPACITANCE AND TAN DELTA MEASUREMENT: (To be done on UST mode)
DESCRIPTION INTERRUPTER 1 INTERRUPTER 2
R Y B R Y B
CAPACITANCE:
SITE
FACTORY
TAN DELTA:
FACTORY
SITE
22. CONTACT RESISTANCE MEASUREMENT:
SL
NO
PHASE ACROSS EACH POLE INTERRUPTER 1 INTERRUPTER 2
FACTORY SITE FACTORY SITE FACTORY SITE
1 RPhase
2 YPhase
3 BPhase
23. BREAKER OPERATION COUNTER READING:
Sl No
PHASE COUNTER TYPE
READING DATE
ELECTRICAL MECHANICAL1 RPhase 2 YPhase 3 BPhase
24. CHECK FOR ANNUNCIATION IN CONTROL ROOM:
(As per the following formats and record the reading)
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Sl NO
DESCRIPTION OF TEST
SOURCE OF INITIATION
WINDOW/HMI DESCRIPTION
RESULT REMARKS OK NOT
OK 1 Switch off the DC
source in control
cubicle
Control cubicle DC
Switch ON/OFF
Source I/II DC Fail, AC Fail
2 Switch off the AC source in control cubicle
Control cubicle AC Switch ON/OFF
Source I/II DC Fail, AC Fail
3 Short the ALARM contacts of SF6 GAS Density Monitor R Phase DENSITY
MONITOR SF6 GAS DENSITY LOW
YPhase DENSITY MONITOR
SF6 GAS DENSITY LOW
BPhase DENSITY MONITOR
SF6 GAS DENSITY LOW
4 Remove the cable connected to Density Monitor RPhase DENSITY
MONITOR OPERATION/CLOSING LOCKOUT
YPhase DENSITY MONITOR
OPERATION/CLOSING LOCKOUT
BPhase DENSITY MONITOR
OPERATION/CLOSING LOCKOUT
5 Give Tripping command to RPh only and check the operation of Pole Discrepancy Relay
PD Relay at CB Cubicle
Breaker Pole Discrepancy
6 Give Tripping command to YPh only and check the operation of Pole Discrepancy Relay
PD Relay at CB Cubicle
Breaker Pole Discrepancy
7 Give Tripping command to YPh only and check the operation of Pole Discrepancy Relay
PD Relay at CB Cubicle
Breaker Pole Discrepancy
8 Close the breaker and Trip through Protection which are applicable
Protection relay as per scheme
Breaker Auto Trip
NOTE: The tripping details are to be checked as per the Scheme approved by design.
25. Operation time measurement of pole discrepancy relay:
26.
Mechanical close interlock checked (wherever applicable): Yes / No
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vii). All fittings as per Out line General Arrangement drawing.
viii). Levelling and alignment of structure and base frame is checked
ix). Erection completion certificate along
with list of outstanding activities Reviewed
x). Any paint removed / scratched in transit has been touched up
xi). Check primary polarity of CT,s erected as per relevant drawing.
xii). Check hermetically sealing is intact
xiii). Check the oil level and leakage through any joints / Sec. Terminals
xiv). Check oil drain valve is properly
Closed and locked. xv). Oil Level & Oil sampling
xvi). N2 pressure checked (wherever applicable)
xvii). Oil level on top chamber gauge glass
xviii). BDV of oil sample taken from tank bottom drain valve ( only if Nitrogen Pressure is measured zero )
xix). All the cable identification tags provided and all cores are provided with identification ferrules at M.B.
xx). Check secondary cable end box is properly fixed and ensure cable entry at the bottom and unused holes sealed
xxi). Ensure interpole cabling is completed And check the continuity.
xxii). Check the IR value of secondary cable
xxiii). Check external cabling from junction box to relay / control panel completed
xxiv). Ensure unused secondary cores, if any, has been shorted
xxv). Check star point has been formed properly and grounded at one end only
xxvi). Check spark gap setting in P1 terminal (wherever provided/ possible) Permanent pole levelling and identification markings made
xxvii). Check TAN DELTA test tap is properly earthed
xxviii). Check that lugs used in secondary circuit are of ring type
xxix). Check direction of PRIMARY (P1/ P2) w.r.t.
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BUS/LINE on erection xxx). Provision of bimetallic strips (Cu +AL)
ensured wherever applicable
2.0 INSULATION RESISTANCE MEASUREMENT: ( USING 5KV MEGGER)
Sl No. of Megger:
Make:
Calibration valid up to: _____/______/______
Ambient temperature:_______ 0C
Relative Humidity:
NOTE: A) Remove the connected earthing to system involving CT under test
B) Disconnect the connected terminals of CT M.Box
C) Permissible values is 1000 M.
SL No
CORE PHASE RPhase (M) YPhase (M) BPhase (M)
1 PRIMARY CORE I 2 PRIMARY CORE II 3 PRIMARY CORE III 4 PRIMARY CORE IV 5 PRIMARY CORE V 6 PRIMARY EARTH
3.0 INSULATION RESISTANCE MEASUREMENT: (Using 500 V Megger)
Sl No. of Megger:
Make:
Calibration valid up to: _____/______/______
Ambient temperature:_______ 0C
a)
SL No
CORE PHASE RPhase (M) YPhase (M) BPhase (M)
1 CORE I Earth 2 CORE II Earth 3 CORE III Earth 4 CORE IV Earth 5 CORE V Earth 6 EARTH Earth
b)
SL No
CORE PHASE RPhase (M) YPhase (M) BPhase (M)
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10 kV
b) TAN DELTA MEASUREMENT
VOLTAGE TAN DELTA (MEASURED VALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2 kV
10 kV
8.0 CURRENT RATIO TEST
Sl No. of Test Kit:
Make:
Primary Current Range: VA Burden:
Calibration valid up to: _____/______/______
Date of Testing: ______/______/______
Ambient temperature:_______ 0C
a) R PHASE
CORE PRIMARY CURRENT SECONDARYCURRENT
THERITICALRATIO
ACTUAL RATIO
% OF ERROR% ACTUAL
COREI (1S11S2)
20% 40% 80%
COREII (2S1 2S2)
20% 40% 80%
COREIII (3S13S2)
20% 40% 80%
COREIV
(4S14S2)
20%
40% 80%
COREV (5S15S2)
20% 40% 80%
COREI (1S11S3)
20% 40% 80%
COREII (2S1 2S3)
20% 40% 80%
COREIII (3S13S3)
20% 40%
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80% COREIV (4S14S3)
20% 40% 80%
COREV
(5S15S3)
20%
40% 80%
COREI (1S11S4)
20% 40% 80%
COREII (2S1 2S4)
20% 40% 80%
COREIII (3S13S4)
20% 40% 80%
COREIV (4S14S4)
20% 40% 80%
COREV (5S15S4)
20% 40% 80%
b) Y PHASE
CORE PRIMARY CURRENT SECONDARYCURRENT
THERITICALRATIO
ACTUAL RATIO
% OF ERROR
% ACTUAL COREI (1S11S2)
20% 40% 80%
COREII (2S1 2S2)
20% 40% 80%
COREIII (3S13S2)
20% 40% 80%
COREIV
(4S14S2)
20%
40% 80%
COREV (5S15S2)
20% 40% 80%
COREI (1S11S3)
20% 40% 80%
COREII (2S1 2S3)
20% 40% 80%
COREIII (3S13S3)
20% 40%
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80% COREIV (4S14S3)
20% 40% 80%
COREV
(5S15S3)
20%
40% 80%
COREI (1S11S4)
20% 40% 80%
COREII (2S1 2S4)
20% 40% 80%
COREIII (3S13S4)
20% 40% 80%
COREIV (4S14S4)
20% 40% 80%
COREV (5S15S4)
20% 40% 80%
c) BPHASE
CORE PRIMARY CURRENT SECONDARYCURRENT
THERITICALRATIO
ACTUAL RATIO
% OF ERROR
% ACTUAL COREI (1S11S2)
20% 40% 80%
COREII (2S1 2S2)
20% 40% 80%
COREIII (3S13S2)
20% 40% 80%
COREIV
(4S14S2)
20%
40% 80%
COREV (5S15S2)
20% 40% 80%
COREI (1S11S3)
20% 40% 80%
COREII (2S1 2S3)
20% 40% 80%
COREIII (3S13S3)
20% 40%
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80% COREIV (4S14S3)
20% 40% 80%
COREV
(5S15S3)
20%
40% 80%
COREI (1S11S4)
20% 40% 80%
COREII (2S1 2S4)
20% 40% 80%
COREIII (3S13S4)
20% 40% 80%
COREIV (4S14S4)
20% 40% 80%
COREV (5S15S4)
20% 40% 80%
9.0 MAGNETISING CURVES PERFORMANCE
KNEE POINT VOLTAGE ( KVp ) _______________ VOLT
Sl No. of Test Kit:
Make:
Calibration valid up to: _____/______/______
Date of Testing: ______/______/______
Ambient temperature:_______ 0C
a) R PHASE
VOLTAGE CURRENT MEASUREMENT (mA) To be
applied
Actual
Value
COREI COREII COREIII COREIV COREV
1S11S2 2S1 2S2 3S13S2 4S14S2 5S15S2 0.25xKVP Not to
apply for Metering Core
0.5xKVP 0.75xKVP 1.00xKVP 1.10xKVP
b) Y PHASE
VOLTAGE CURRENT MEASUREMENT (mA) To be applied
Actual Value
COREI COREII COREIII COREIV COREV 1S11S2 2S1 2S2 3S13S2 4S14S2 5S15S2
0.25xKVP Not to
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0.5xKVP apply for Metering Core
0.75xKVP 1.00xKVP 1.10xKVP
c) B PHASE
VOLTAGE CURRENT MEASUREMENT (mA) To be applied
Actual Value
COREI COREII COREIII COREIV COREV 1S11S2 2S1 2S2 3S13S2 4S14S2 5S15S2
0.25xKVP Not to apply for Metering Core
0.5xKVP 0.75xKVP 1.00xKVP 1.10xKVP
NOTE :
1.0 CT should not saturate at 110 % of knee point voltage ( KVp )
2.0 If knee point voltage is not mentioned then knee point current may be taken into
consideration
10.0 CONTACT RESISTANCE MEASUREMENT
Details of Test Kit:
CONTACT RESISTANCE RPhase ( ) YPhase( ) BPhase( )
Across terminal P1
Across terminal P2
NOTE : The value of contact resistance should not be more than 10 PER JOINT /
CONNECTOR.
11.0 DGA TEST OF CT OIL (AFTER ONE MONTH OF COMMISSIONING)
(Sample to be taken at 250 ml bottle)
DISOLVE GAS RPHASE YPHASE BPHASE REMARKS Total Gas% H2 CH4 C2H4 C2H6 C2H2 CO CO2 O2 N2
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12.0 FINAL DOCUMENTATION REVIEW :
a) Final document of pre commissioning checks Reviewed and Approved: YES / NO
b) Documents regarding spares, equipment, O& M Manuals etc. available at site for o & m purpose: YES / NO
c) After modification, if any, "as built drawings" are available at site: YES / NO
Signature: Signature: Signature: Signature Name: Name: Name: Name:
Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF CAPACITOR VOLTAGE TRANSFORMER
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
BAY NAME / NO:
DATE OF ERECTION: DATE OF ENERZIZATION:
Voltage level, kV 132 220 400
DETAILS OF EQUIPMENT:
DESCRIPTION RPHASE YPHASE BPHASE PURCHASE ORDER NO MAKE TYPE SERIAL NO CAPACITANCE (pF)
SECONDARY DETAILS:
DESCRIPTION WINDINGI WINDINGII WINDINGIII VOLTAGE (V) VA BURDEN (VA) CLASS PURPOSE
1.0 DETAILS OF CHECK LIST:
SL No
DESCRIPTION STATUS REMARKS RECORD DEFICENCIES, IF ANY
YES NO
i). Equipment is cleaned and free from Dust / Dirt foreign materials etc.
ii). Equipment is free from all visible defects on physical inspection
iii). Check CVT tank has been provided With double earthing
iv). Check that CVT Marshalling Box is earthed v). All nuts and bolts are tightened
correctly as per specified torque vi). Check tightness of terminal connector vii). All fittings as per Out line
General Arrangement drawing.
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viii). Levelling and Identification marking is carried out.
ix). Levelling and alignment of structure and base frame is checked
x). Erection completion certificate along
with list of outstanding activities Reviewed
xi). Any paint removed / scratched in transit has been touched up
xii). Sl. No of HV CAPACITOR identical to the Sl.no mentioned on RATING & DIG. PLATE
xiii). Ensure brass vent plug between stacks of CVT's is removed
xiv). Check the oil level and leakage through any joints / Sec. Terminals
xv). Check oil drain valve is properly
Closed and locked. xvi). Oil Level on tank Gauge Glass xvii). BDV of oil sample taken from tank
bottom drain valve xviii). Check secondary cable end box is
properly fixed and ensure cable entry at the bottom and unused holes sealed
xix). Ensure H.F terminal of unused phases has been earthed and no load on H.F terminal bushing
xx). Check RATING / HEALTHINESS of Fuses at CVT M.B and CVT terminal box.
xxi). Check that the neutral point is earthed xxii). Ensure interpole cabling is completed
and check the continuity xxiii). Check the IR value of secondary cable xxiv). Check external cabling from junction box to
relay / control panel completed xxv). All the cable identification tags provided and
all cores are provided with identification ferrules at M.B.
2.0 CONTINUITY OF WINDING: (After removing Earth Link 1, 2 & 3)
Sl No BETWEEN TERMINAL OK NOT OK A 1a 1n B 2a 2n C 3a 3n
3.0 INSULATION RESISTANCE MEASUREMENT: (Using 5 kV Megger)
Details of Megger:
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SL No: Type: Make:
Ambient Temperature: __________ 0C
Sl No BETWEEN MEASURED VALUE (M) R Phase Y Phase B Phase
i) Primary Secondary CORE 1 ii) Primary Secondary CORE 2 iii) Primary Secondary CORE 3 iv) Primary Earth
4.0 INSULATION RESISTANCE MEASUREMENT: (Using 500 V Megger)
Details of Megger:
Sl No BETWEEN MEASURED VALUE (M) R Phase Y Phase B Phase
i) Secondary CORE 1 Earth ii) Secondary CORE 2 Earth iii) Secondary CORE 3 Earth iv) CORE 1 CORE 2 v) CORE 1 CORE 3 vi) CORE 2 CORE 3
5.0 VOLTAGE RATIO TEST:
Details of Testing Instruments:
PHASE PRIMARY SECONDARY VOLTAGE THEORITICALRATIO
ACTUAL RATIO % ERROR Between Value FACTORY SITE
R 1a 1n
2a 2n
3a 3n
Y 1a 1n 2a 2n 3a 3n
B
1a 1n
2a 2n 3a 3n
NOTE : 1. Apply voltage of the order of 500 V or more across line capacitor ( top flange ) to earth link 2. Ensure all earth links connected
6.0 TAN DELTA AND CAPACITANCE MEASUREMENT
Sl No. of Test Kit:
Make:
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Serial No:
Calibration valid up to: _____/______/______
Date of Testing: ______/______/______
Ambient temperature:_______ 0C
a) CAPACITANCE MEASRUEMENT
VOLTAGE CAPACITANCE (MEASURED VALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2 kV
10 kV
a) TAN DELTA MEASUREMENT
VOLTAGE TAN DELTA (MEASURED VALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2 kV
10 kV
7.0 FINAL DOCUMENTATION REVIEW :
d) Final document of pre commissioning checks Reviewed and Approved: YES / NO
e) Documents regarding spares, equipment, O& M Manuals etc. available at site for o & m purpose: YES / NO
f) After modification, if any, "as built drawings" are available at site: YES / NO
Signature: Signature: Signature: Signature Name: Name: Name: Name: Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF SURGE ARRESTER
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
BAY NAME / NO:
DATE OF ERECTION: DATE OF ENERZIZATION:
Voltage level, kV 33 132 220 400
DETAILS OF EQUIPMENT:
DESCRIPTION RPHASE YPHASE BPHASE PURCHASE ORDER NO MAKE TYPE SERIAL NO RATING
1.0 DETAILS: CHECK LIST / TESTING
SL No
DESCRIPTION STATUS REMARKS RECORD DEFICENCIES, IF ANY
YES NO
i). Equipment is cleaned and free from Dust / Dirt foreign materials etc.
ii). Equipment is free from all visible defects on physical inspection
iii). Support structures have been provided with double earth
iv). All nuts and bolts are tightened correctly as per specified torque
v). Equipment erection is complete in all respect (ATTACH REMAINING ACTIVITIES,IF ANY)
vi). Levelling and Identification marking is carried out.
vii). Levelling and alignment of structure and base frame is checked
viii). All insulators & Surge counter are free from any physical defects
ix). Check tightness of all nuts & bolts and terminal connector
x). Erection completion certificate along with list of outstanding activities
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reviewed xi). Check one end of surge counter is connected
to the bottom of la stack and one end of surge counter has been earth
xii). The direction of the exhaust vent ports away
from the protected equipment and other arrester poles
xiii). Clearance from the arrester to earthed objects and from the arrester pole to another arrester pole maintained as per Outline drawing and all erection has been done as per approved drawing.
xiv). Check the serial no. and sequence of LA parts for erection in multi stack LA
xv). Check the alignment of Corona Ring xvi). Check on charging, the Surge Counter
pointer is in green zone
2.0 INSULATION RESISTANCE MEASUREMENT: (Using 5 kV Megger)
Sl No. of Test Kit:
Make:
Calibration valid up to: _____/______/______
Date of Testing: ______/______/______
Ambient temperature:_______0C
Sl No BETWEEN PHASE RPhase (M) YPhase (M) BPhase (M)
a 1st Stack Earth b 2nd Stack Earth c 3 rd Stack Earth d 4 th Stack Earth e 5 th Stack Earth
f 6th
Stack Earth
3.0 SURGE COUNTER READING:
Sl No READING PHASE RPhase YPhase BPhase
a Counter Serial No. b Counter Make c Counter Reading
4.0 CAPACITANCE & TAN DELTA MEASUREMENT:
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Sl No. of Test Kit:
Make:
Calibration valid up to: _____/______/______
Date of Testing: ______/______/______
Ambient temperature:_______ 0C
VOLTAGE STACK CAPACITANCE TAN DELTA REMARKS 2 kV TOP
MIDDLE 1 MIDDLE 2 BOTTOM
10 kV TOP MIDDLE 1 MIDDLE 2 BOTTOM
5.0 CHECKING OF HEALTHINESS OF SURGE MONITOR : OK / NOT OK
6.0 FINAL DOCUMENTATION REVIEW :
g) Final document of pre commissioning checks Reviewed and Approved: YES / NO
h) Documents regarding spares, equipment, O& M Manuals etc. available at site for o & m purpose: YES / NO
i) After modification, if any, "as built drawings" are available at site: YES / NO
Signature: Signature: Signature: Signature Name: Name: Name: Name: Designation: Designation: Designation: Designation: (Supplier Rep) Erection Agency: Site I/C, AEGCL T & C, AEGCL
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ASSAM ELECTRICITY GRID CORPORATION LIMITED
PRECOMMISSIONING OF 220 kV LINE RELAY & CONTROL PANEL
COMMISSIONING FORMATS
DOC NO: SUBSTATION:
BAY NAME / NO:
DATE OF ERECTION: DATE OF ENERZIZATION:
Voltage level, kV 33 132 220 400
DETAILS OF EQUIPMENT:
Make: Year of Manufacture:
Purchase Order No:
Type of Panel: Swing Simplex/Simplex/Duplex DC Auxiliary Voltage:
Panel Overall Dimensions:
Relay Specifications Details:
Sl No
Relay Type Make Relay Ordering Code
Relay Compatibility
Type & Nos. of Communication Ports
No. of Analogue Channel
Nos. of BI & BO
IEC 61850
Modbus RJ 45 Serial BI BO
1 Main 1 2 Main 2 3 Line
Differential
1.0 DETAILS: CHECK LIST / TESTING
a. Wiring
Sl No
As per norms Yes No Remarks
1 Wiring done using PVC insulated 650 grade single-core multi strands annealed copper conductor flexiblewire.
2 2.5 Sqmm Red, Yellow, Blue & Black for CT Circuit3 2.5 Sqmm Red, Yellow, Blue & Black for PT Circuit4 2.5 Sqmm for 240V AC circuits5 1.5 Sqmm Grey for DC circuits
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6 1.5 Sqmm Black for AC circuits7 2.5 Sqmm Green for Earthing Circuit
b. EARTHING:
Sl No
As per norms Yes No Remarks
1 1 no. Copper Bar of size 25 x 6 mm will be runthroughout the board
2 Earthing between equipments will be looped &finally terminated in Earth bar
3 Earth bar coupling link of copper will be provided between adjacent panels
c. AC DISTRIBUTION:
Sl No
As per norms Yes No Remarks
1 Checking of AC Supervision Relay2
d. DC DISTRIBUTION
e. VOLTAGE SELECTION RELAYS
Sl No
As per norms Yes No Remarks
1 75 A2 75 B
3 Check VTSS (BPT-LPT)
Sl No
As per norms Yes No Remarks
1 Checking of DC Supervision Relay2 Source-13 Source-24 Changeover between Sources
a) Electro Mechanical switch b) Through changeover relays
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f. METERING CIRCUIT
Sl No
As per norms Yes No Remarks
1 W Meter2 VAR Meter3 V Meter4 A Meter5 TVM Meter
g. SYNCHRONISING CIRCUIT
Sl
No
As per norms Yes No Remarks
1 Bus PT Supply Circuit2 Line CVT Supply Circuit
h. CT CIRCUIT
Sl No
As per norms Yes No Remarks
1 Metering CircuitStar PointContinuityEarthing should be either at CT JB or at Panel end
2 Main Protection CircuitStar PointContinuityEarthing should be either at CT JB or at Panel end
3 B/U Protection CircuitStar PointContinuityEarthing should be either at CT JB or at Panel end
4 BBP Protection CircuitStar PointContinuityEarthing should be either at CT JB or at Panel end
i. Input Circuit
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Sl No
As per norms Yes No Remarks
1 Main/TBC CB R phase Open2 Main/TBC CB Y phase Open3 Main/TBC CB B phase Open4 Main/TBC CB Ready for A/R5 Carrier Out of Service
Sl No
As per norms Yes No Remarks
6 External LBB/ A/R InitiationR phaseY phaseB phase
7 A/R Switch ON8 Carrier Channel I Healthy
Carrier Channel II Healthy9 Carrier Channel I Received10 SOTF Initiation11 A/R Block12 Main CB Open Status
R phaseY phase
B phase13 TBC CB Open StatusR phaseY phaseB phase
14 Main CB Ready for A/R15 TBC CB Ready for A/R
j. Carrier circuit
Sl No
As per norms Yes No Remarks
1 Carrier Channel I Received2 Carrier Channel I Healthy3 Carrier Channel I Send
Carrier Channel II Send4 Carrier Channel II Received5 Carrier Channel II Healthy6 Carrier Channel I Send
Carrier Channel II Send7 Direct Trip Received
Channel I
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Channel II8 Direct Trip Send
Channel IChannel II
910
k. Single Phase/ Three Phase Initiation Circuit
Sl No
As per norms Yes No Remarks
1 1 Trip R- : 86 R11 Trip Y- : 86 Y11 Trip B- : 86 B1
2 1 Trip R- : 86 R21 Trip Y- : 86 Y21 Trip B- : 86 B2
3 Master Trip Relay : 86 A OptdDistance Prot Optd.B/U Protection Optd.DT Received Ch-IDT Received Ch-II
Master Trip Relay : 86 B OptdDistance Prot Optd.B/U Protection Optd.DT Received Ch-IDT Received Ch-II
4 Auxiliary Trip Relay: 86 X (RL-1) Optd.Auxiliary Trip Relay: 86 X (RL-2) Optd.
l. LBB Trip Relay Circuit
Sl No
As per norms Yes No Remarks
1 LBB -96 Realy Optd.2 Check all the Trip Extensions as per scheme
i)ii)iii)iv)
v)vi)
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vii)
m. CB Closing & Manual Trip Circuit
Sl No
As per norms Yes No Remarks
1 DC Supply-1 to CBDC Supply-2 to CB
2 Auto Reclose/ Remote Close3 Manual Trip-1 (TC-1)/ (TC-2)
n. CB TC-1 / TC 2 Circuit (Protection Trip/Post Close Supn) & Pre CloseSupervision
Sl No
As per norms Yes No Remarks
1 1- Optd. From Main Prot. Relay
2 Group A Trip Optd.
Group B Trip Optd.
3 LBB/ BB Optd.
4 195 R
195 Y
195 B
o. TTX Contact Multiplication Circuit (Related to TTS)
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Sl No
As per norms Yes No Remarks
1 TTX 1
TTX 2
TTX3
2
p. TBC TRIPPING CIRCUITSl
NoAs per norms Yes No Remarks
1 86 A Extension
86 B extension
1- Trip Optd. From Main Protection RelayR
Y
B
2 To LBB Initiation TBC
86 R1
86 Y1
86 B1
86 R2
86 Y2
86 B2
q. ISOLATOR CONTROL CIRCUIT
Sl No
As per norms Yes No Remarks
1 89 A Close
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89 A Open
89 B Close
89 B Open
89 C Close
89 C Open
89 D Close
89 D Open
r. INDICATION CIRCUITSl
NoAs per norms Yes No Remarks
1 CB OpenCB CloseCB Auto TripCB Spring Charged89 A Open89 B Close89 B Open89 BE Close
89 BE Open89 C Close89 C Open89 D Close89 D Open89 DE1 Close89 DE1 Open89 DE2 Close89 DE2 Open
2 Line Hot R- Healthy
Line Hot Y- HealthyLine Hot B- Healthy
s. ANNUNCIATION CIRCUITSl
NoAs per norms Yes No Remarks
1 DC Fail2 AC Fail3 Main Dist Prot. Optd.4 O/C & E/F Optd.5 DEF/ SOTF Optd.
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6 Carrier CH-I & II Fail7 A/R Optd.8 Power Swing Detected9 Panel AC Supply Fail10 LBB/BB Optd.11 Numerical Relay Faulty12 DT Received Ch-I & II13 CB TC-1 faulty14 CB TC-2 faulty15 SF6 Low Alarm16 SF6 Lock Out
t. Main Distance Protection Relay
Sl No
As per norms Yes No Remarks
1 Check CT Circuit (If any Mismatch)
2 Check PT Circuit (If any Mismatch)
3 Zone Reach Test
4 LBB
5 SOTF Optd.
6 Carrier Send
7 A/Ri) AR Optd
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20 High Set
v. ISOLATOR INTERLOCK CIRCUIT
Sl No
As per norms Yes No Remarks
1 89 A Interlock
2 89 B Interlock
3 89 BE Interlock
4 89 DE1 Interlock
5 89 DE2 Interlock
6 89 D Interlock
7 89 C Interlock