Injection Station A

PRE-COMMISSIONING TESTS REPORT

FOR

A PROPOSED 1 X 15MVA, 33/11KV INJECTION SUBSTATION A IN LAGOS, NIGERIA

BY ENGR . C. ENEH

PRE-COMMISSIONING TEST REPORT ON 1X15MVA,33/11KV INJECTION SUBSTATION A. 1.0 POWER TRANSFORMER REPORT1.1Transformer ParticularLocation: Lagos injection substation ASerial No: 12 35 206Make: Power system technology ltdRating: 15MVA Ratio: 33000/11000 VImpedance: 10.12%Vector: Dyn 1Primary current (Ip): 262.4AmpsSecondary current (Is): 787.3Amps Year: 12 - 5

1.2INSPECTION, CHECKS AND OPERATIONSS/NDescriptionOk

Not okNot Applicable

1Oil Sample from bottom of main tankOk

2Oil Sample from top of main tankOk

3Oil Sample from OLTCOk

4Oil Level in the Conservator TankOk

5Oil Level in the On Load Tap Changer Ok

6Buchholz Relay/OSR valves are openOk

7Transport Lock in Buchholtz Relay removedOk

8Colour of Silica Gels in Main Tank Breather Ok

9Colour of Silica Gels in OLTC Breather Ok

10Oil cup of Main Tank Breather is filled and up to level markOk

11Oil cup of OLTC Breather is filled and up to level markOk

12Sealing Cap of Main Tank Breather is removedOk

13Sealing Cap of OLTC Breather is removedOk

14All Radiator shut off valves (Top and Bottom) are openOk

15All sampling, drain and filtration valves are closedOk

16There is no oil leakage from any gasket/weld jointOk

17Explosion vent diaphragms are intact and there is no oil explosion vent Ok

18Oil is filled in OTI/WTI pocketsOk

19Air Released from:1. All Bushings1. All Bushing Pockets1. Buchholz Relay and OSR1. Main Tank Cover1. All Radiators1. Main Tank1. OLTC1. ConservatorOkOkOkOkOkOkOkOk

20OLTC/ Off Circuit Tap Switch is in the desired positionOk

21Tank Earthing is firmly connectedOk

22Neutral Bushing Earthing is connectedOk

23CT secondary terminals if not used are shorted and earthedOk

24Alarm and Trip contacts of all instruments are setOk

25Cable Glands as appropriate are used and securedOk

2633kV and 11kV line connections are duly tightenedOk

27Remote and Local Operation of the Tap ChangerOk

1.3LIST OF VALVES & SERVICE POSITIONS/NDescriptionService position

1Drain valve for Main Tank (Top & Bottom)Shut

2Filter Valve for Main Tank (Top & Bottom)Shut

3Sampling Valve for Main Tank (Top & Bottom)Shut

4Drain Valve for OLTCShut

5Conservator Drain ValveShut

6OLTC conservator drain valveShut

7Radiator ValveOpen

8Buchholz Relay ValveOpen

9Oil Surge Relay ValveOpen

10Breathing ValveOpen

1.4TRANSFORMER INSULATION TEST5KV MEGGERSIDEMeasured valueDurationRemark

HV - E3.34G60secso.k

LV E3.8G60secso.k

HV - LV4.23G60secso.k

REMARKS: okay.

1.5RATIO TEST THREE PHASE RATIOMETERTAPTRatVRatI (mA)P () (%)

15.45353.14862.3-0.03-0.04

5.45393.14881.8-0.02-0.04

5.45533.14963.4-0.03-0.01

35.19542.99952.5-0.02-0.02

5.19572.99972.0-0.03-0.01

5.19693.00043.7-0.030.01

54.93822.85112.7-0.022.60

4.93842.85122.2-0.022.61

4.93952.85184.1-0.022.63

REMARKS: okay.1.6SINGLE PHASE RATIO TEST

RYYBBRryybbrrnynbn

RY227.5115.199.466.664.30.622.743.721.2

YB178.4226.141.629.881.250.67.135.843.8

BR180.139.0225.279.529.150.743.534.87.9

REMARKS: okay.1.7CONTINUITY AND WINDING RESISTANCE TESTHigh voltage sideLow voltage side

PhasesResistance ()phasesResistance ()phasesResistance ()

R - Y0.04r y0.04r N0.04

Y B0.04y b0.04y N0.04

B - R0.04b - r0.04b - N0.04

REMARKS: okay.

1.8SINGLE PHASE SHORT CIRCUIT TEST

RYBrYBn

14.323.948.124.10.1

14.324.223.948.20.2

14.248.024.424.10.2

REMARKS: okay.1.9FUNCTIONING TEST ON TRANSFORMER PROTECTION1.9.1BUCCHOLZALARM-O.KTRIP-O.K1.9.2OIL TEMPERATUREALARM-O.KTRIP-O.K1.9.3WINDING TEMPERATUREALARM-O.KTRIP-O.K

1.9.4PRVTRIP-O.KREMARKS: okay.

2.0PRESSURE TEST RESULT ON 11KV CABLE TO INCOMER PANELTERMINALINJECTED VOLTAGELEAKAGE CURRENTREMARK

R - E25KV0.05mAo.k

Y - E25KV0.02mAo.k

B - E25KV0.04mAo.k

3.0PRESSURE TEST RESULT ON 33KV CONDUCTOR WITH THE ISOLATORS AND OUTDOOR BREAKER IN CLOSED POSITION

R-55KV= 0.06mAfor120secsY-55KV= 0.03mAfor120secsB-55KV= 0.04mAfor120secsREMARKS: okay.

4.0EARTH RESISTANCE MEASUREMENTi) Transformer Body=4.3ii) Lightning Arrester=0.7iii) Transformer Isolator=36.5iv) Transformer Current Transformer=0.7v) Transformer Circuit Breaker=36.6 vi) Bus Isolator 1=0.26 vii) Bus bar=0.35viii) Bus bar Circuit Breaker=overloadix) Bus Isolator 2=0.23 x) Bus Current Transformer=0.96xi) Line Current Transformer=0.96xii) Line Circuit Breaker=30.3xiii) Line Circuit Breaker Isolator=26.5xiv) Voltage Transformer=overloadAverage =9.88Earth resistance value of the station transformer =0.34REMARKS: fail.5.033KV TRANSFORMER VACUUM CIRCUIT BREAKER TEST REPORT5.1INSPECTION, CHECKS AND OPERATIONS

S/No.DescriptionRemark

1Manual Opening of Transformer Breaker from Local PositionOk

2Manual Closing of Transformer Breaker from Local Position Ok

3Auto opening of Transformer Breaker from Remote PositionOk

4Auto Closing of Transformer Breaker from Remote PositionOk

5Pressure of SF6 Gas in Transformer BreakerOk

6Spring Charging Mechanism of Transformer BreakerOk

POLARITY TEST -O.K CB FUNCTION TEST -O.K CLOSE & TRIP FUNCTION TEST-O.K CONDITION OF THE INDICATION-O.K LOCAL & REMOTE MODE TEST-O.K CONDITION OF THE SPRING CHARGING MOTOR-O.KREMARKS: okay.

6.033KV CURRENT TRANSFORMERS TEST REPORT 6.133KV TRANSFORMER SIDE: CT1 - RATIO TEST ( 400/200-1A) used 400A(A)INSPECTION RESULTSS/No.DescriptionRemark

1Oil Level in Transformer Current TransformersOK

2No oil Leakage from Transformer Current TransformersYES

(B)PRIMARY INJECTION TEST RESULTS

PHASEPRIMARY INJECTED CURRENT (A)SECONDARY MEASURED CURRENT (A)

R1000.24

Y1000.25

B1000.24

REMARKS: okay.

6.233KV BUS COUPLER SIDE: CT2 : RATIO TEST ( 400/200 - 1A) - used 400A(A)INSPECTION RESULTSS/No.DescriptionRemark

1Oil Level in Bus Coupler Current Transformers OK

2No oil Leakage from Bus Coupler Current TransformerYES

(B)PRIMARY INJECTION TEST RESULTSPHASEPRIMARY INJECTED CURRENT (A)SECONDARY MEASURED CURRENT (A)

R1000.24

Y1000.25

B1000.24

REMARKS: okay.

7.033KV COUPLER VACUUM CIRCUIT BREAKER TEST REPORT7.1INSPECTION AND FUNCTIONAL TEST RESULTS


1Manual Opening of Bus Coupler Breaker from Local PositionOK

2Manual Closing of Bus Coupler Breaker from Local Position Ok

3Auto opening of Bus Coupler Breaker from Remote PositionOk

4Auto Closing of Bus Coupler Breaker from Remote PositionOk

9Pressure of SF6 Gas in Bus Coupler BreakerOk

11Spring Charging Mechanism of Bus Coupler BreakerOk

POLARITY TEST -O.K CB FUNCTION TEST -O.K CLOSE & TRIP FUNCTION TEST-O.K CONDITION OF THE INDICATION-O.K LOCAL & REMOTE MODE TEST-O.K CONDITION OF THE SPRING CHARGING MOTOR-O.KREMARKS: okay.8.011KV CURRENT TRANSFORMERS TEST REPORT

8.1INCOMER : RATIO TEST (800/400 - 5A) used 800APHASEPRIMARY INJECTED CURRENT (A)SECONDARY MEASURED CURRENT (A)

R1000.625

Y1000.622

B1000.621

REMARKS: okay. 8.1RATIO TEST (400/200 - 5A) used 400APHASEPRIMARY INJECTED CURRENT (A)SECONDARY MEASURED CURRENT (A)

R1001.25

Y1001.25

B1001.25

REMARKS: okay.

9.0PROTECTION TRIP TEST REPORTLOCATION: 11KV OUTGOINGS POLARITY TEST -O.K VCB FUNCTION TEST -O.K MANUAL CLOSE & TRIP FUNCTION TEST-O.K REMOTE CLOSE & TRIP FUNCTION TEST-O.K CONDITION OF THE INDICATIONS-O.K RACK-IN & RACK-OUT TEST-O.K METERING DISPLAY - O.K CONDITION OF THE SPRING CHARGING MOTOR-O.KREMARKS: okay.

10.0ISOLATORS TEST REPORT

10.1INSPECTION, CHECKS AND OPERATIONS


1Opening of Bus Isolators OK

2Closing of Bus Isolators OK

3Opening of Transformer Isolators OK

4Closing of Transformer Isolators 0K

ISOLATOR BEFORE TRANSFORMER VCB

OPEN AND CLOSE CONDITION -OKAY BUS ISOLATOR

OPEN AND CLOSE CONDITION -OKAY ISOLATOR AFTER BUS-COUPLER VCB

OPEN AND CLOSE CONDITION -OKAY ISOLATOR BEFORE BUS-COUPLER VCB

OPEN AND CLOSE CONDITION -OKAYREMARKS: okay.

11.0TRANSFORMER OIL TEST REPORT1 (KV)2 (KV)3 (KV)4 (KV)5 (KV)6 (KV)Total (KV)Average (KV)

60606060606036060

REMARKS: okay.

12.0OPERATIONAL AND RELAY TEST REPORTS12.1TRANSFORMER VACUUM CIRCUIT BREAKERS/No.DescriptionRemark

1Manual Closing Ok

2Remote Closing Ok

3Manual Tripping Ok

4Remote TrippingOk

5Tripping Through RelayOk

6Inter-lockingOk

7Remarks / observation Annunciation Alarm Ok or Not Ok

REMARKS: okay.12.211KV INCOMER CIRCUIT BREAKER


1Manual Closing Ok

2Remote Closing Ok

3Manual Tripping Ok

4Remote TrippingOk


6Inter-lockingOk


REMARKS: okay.

12.311KV OUTGOING 1 CIRCUIT BREAKERS/No.DescriptionRemark

1Manual Closing Ok

2Remote Closing Ok

3Manual Tripping Ok

4Remote TrippingOk


6Inter-lockingOk


REMARKS: okay.

12.411KV OUTGOING 2 CIRCUIT BREAKERS/No.DescriptionRemark

1Manual Closing Ok

2Remote Closing Ok

3Manual Tripping Ok

4Remote TrippingOk


6Inter-lockingOk


REMARKS: okay.

12.511KV PANELS FINAL RELAY SETTINGSS/No.NAME OF FEEDERSPHASESETTING (%)TIME SETTING (seconds)

1INCOMER RYB6060600.10.10.1

2OUTGOING 1 RYB7575750.050.050.05

3OUTGOING 2 RYB7575750.050.050.05

REMARKS: okay.12.611KV PANELS SECONDARY INJECTION TEST (RELAY CHARACTERISTIC CHECKS)

S/No.NAME OF FEEDERSTYPE OF RELAYPHASEPICK UPCURRENT(A)INJECTEDCURRENT(A)FLAG OPERATIONOBSERVATION: whether breaker tripped or not alarm indication

1INCOMER ABBRedYellowBlue4.24.14.2555OkOkOkTrippedTrippedTripped

2OUTGOING 1 RedYellowBlue4.14.24.1555OkOkOkTrippedTrippedTripped

3OUTGOING 2 RedYellowBlue4.24.24.2555OkOkOkTrippedTrippedTripped

REMARKS: okay.

13.0STATION SUPPLY TRANSFORMER TEST REPORT 13.1TRANSFORMER PARTICULAR

Serial No: S 700/33Make: NIPPRating: 200KVARatio: 33000/415KVImpedance: 4.21%Vector: Dyn 11Ip: 3.49AmpsIs: 278.2AmpsYear: 2008

13.2INSULATION TEST

HV G=2.0GLV G=689.5MHV LV=389.9M

13.3SINGLE PHASE RATIO TEST

RYYBBRryybbrrnynbn

RY234.557.119.52.50.72.11.41.20.4

YB39.7236.351.41.91.70.10.41.40.9

BR17.560.5235.80.82.31.20.51.21.5

13.4SHORT CIRCUIT TESTRYBrybn

0.235.516.416.40.7

0.216.433.616.40.3

0.216.816.032.50.3

13.5EXCITATIONr n =3.9Ay n =1.7Ab n=3.8A

REMARKS: The transformer was tested okay.

14.0 ADDITIONAL REMARKS

(a) Wiring checks were carried out on the panels and confirmed okay.(b) All fuses and MCBS in the panels were checked okay.(c) 110VDC and 230VAC were supplied to the panels to confirm the indications and alarms on the panels e.g spring charging, breaker off etc. The motor was also spring charging electrically.(d) Close and open operation of the breaker was carried out both electrically and mechanically.(e) The protection relays on all the circuits checked okay. 15.0CONCLUSION: The results of all various tests carried out on the equipment stated therein, are clearly in conformity with the acceptable international standards and therefore recommend for the tie-in of the substation to the national grid.

THANK YOU.

Documents

Injection Station A