precommissioning test format

8/13/2019 Precommissioning Test Format

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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


COREI 1S11S2

COREII 2S12S2 COREIII 3S13S2 COREIV 4S14S2

iii). LV SIDE


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


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


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


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



1U1 N ____________A 1V1N _____________A 1W1 N ____________A

AT LOWEST TAP SUPPLY SHORT ALL 3 LV



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



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PRECOMMISSIONING OF ISOLATOR AND GROUND SWITCH


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



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PRECOMMISSIONING OF WAVE TRAP


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



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PRECOMMISSIONING OF SF6 CIRCUIT BREAKER


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:


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)


GENERAL LOCKOUT (OIL)


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


Pressure after Opening operation, BAR



Pressure after Close/Open operation, BAR

Pump running time, Sec 4 Pressure before operation, BAR

Pressure after Open Close Open operation, BAR


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



7 Give Tripping command to YPh only and check the operation of Pole Discrepancy Relay



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:



a)

SL No


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



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10 kV

b) TAN DELTA MEASUREMENT

VOLTAGE TAN DELTA (MEASURED VALUE) REMARKS



2 kV

10 kV

8.0 CURRENT RATIO TEST

Sl No. of Test Kit:

Make:

Primary Current Range: VA Burden:


Date of Testing: ______/______/______


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


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


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:


Date of Testing: ______/______/______


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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PRECOMMISSIONING OF CAPACITOR VOLTAGE TRANSFORMER


DOC NO: SUBSTATION:

BAY NAME / NO:


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:


Date of Testing: ______/______/______


a) CAPACITANCE MEASRUEMENT

VOLTAGE CAPACITANCE (MEASURED VALUE) REMARKS



2 kV

10 kV

a) TAN DELTA MEASUREMENT

VOLTAGE TAN DELTA (MEASURED VALUE) REMARKS



2 kV

10 kV


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



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PRECOMMISSIONING OF SURGE ARRESTER


DOC NO: SUBSTATION:

BAY NAME / NO:




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:


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:


Date of Testing: ______/______/______


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


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



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PRECOMMISSIONING OF 220 kV LINE RELAY & CONTROL PANEL


DOC NO: SUBSTATION:

BAY NAME / NO:




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


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


1 Checking of AC Supervision Relay2

d. DC DISTRIBUTION

e. VOLTAGE SELECTION RELAYS

Sl No


1 75 A2 75 B

3 Check VTSS (BPT-LPT)

Sl No


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


1 W Meter2 VAR Meter3 V Meter4 A Meter5 TVM Meter

g. SYNCHRONISING CIRCUIT

Sl

No


1 Bus PT Supply Circuit2 Line CVT Supply Circuit

h. CT CIRCUIT

Sl No


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


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


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


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


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


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


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


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


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


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


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


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


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


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