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Transforemer Stability Test Report

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40 MVA Power Transformer Stability Test

1. TRANSFORMER DETAILS: MAKE : ABB

SERIAL NO. :4359245110 FREQUENCY : 50Hz

TYPE OF COOLING : ONAN/ONAF VECTOR GROUP : YN yn0+d11 NO OF TAPS : 25 NOMINAL TAP : 13

Feeder name- Bay- E03 at 132kV side and Bay K09 at 11kV side RATING

WINDING RATED POWER(MVA) RATED VOLTAGE (KV) RATED CURRENTS (A) ONAN/ONAF HV 31.5/40 132 137.8/175.0 MV 31.5/40 11.5 1581/2008 SW 10.5/13.3 8 757.7/962 IMPEDANCE VOLTAGE IMPEDANCE VOLTAGE

WINDING POWER HV VOLTAGES(KV) %

HV-LV AT 40MVA Tap1—151.8 19.51

Tap13---132.0 17.69 Tap25---112.2 16.28

The CT T1 used For Differential protection (F87T)

CT ratio for 132kV Line side CT’s = 300/1A Relay- RET670- ABB CT ratio for 11kV Line side CT’s = 2500/1A

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CT ratio for 132kV Line side CT’s = 300/1A Relay- RET615- ABB CT ratio for HV neutral side= 300/1A

The CT5 used For REF protection at MV side (F64MV)

CT ratio for 11kV Line side CT’s = 2500/1A Relay- RET615- ABB CT ratio for MV neutral side= 2500/1A

The CT1 used For SBEF protection at HV Neutral side (F51NHV ) CT ratio for HV neutral side= 300/1A Relay- REF615- ABB

The CT4 used For SBEF protection at MV neutral side (F51NMV) CT ratio for MV neutral side= 2500/1A Relay- REF615- ABB

The CT9 used For SBEF protection at tertiary side (F51NT)

CT ratio for Tertiary neutral side= 300/1A Relay- REF615- ABB

The CT T1 used For O/C & E/F protection at HV Line side (F51/51NHV) CT ratio for 132kV Line side CT’s = 300/1A Relay- REF615- ABB

Relay used for Over Voltage protection (F59)

VT Ratio 11kV/√3/110V/√3 Relay- REF615- ABB

A. Transformer Stability Test( RET 670)

1a) STABLE CONDITION (132kV BB2 Earth Q25 Closed)

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PHASE Primary current (A) Relay Display Measurement (A) Diff. Display Measurement (A) CT Terminals Sec Current (A) 132kV 11kV 132kV 11kV Diff. Rest 132kV 11kV R 111 151 34.17 392 0 34.32 0.103 0.186 Y 112 150 34.55 392 0 0.107 0.192 B 109 151 33.98 387 0 0.104 0.187 N

1b) UNSTABLE CONDITION (132kV side CT Bypassed by closing the Earth switch Q8 ) a)Three phase voltage injected in 11kV side thru Bay K09(I/C-1)**and all CT’s are Normal

PHASE Primary current (A) Relay Display Measurement (A) Diff. Display Measurement (A) CT Terminals Sec Current (mA) 132kV 11kV 132kV 11kV Diff. Rest 132kV 11kV R 10 150 3.2 393 31.20 34 9.6 153 Y 8 152 3.1 390 31.8 9.2 152 B 10 151 3.0 385 31.2 9.0 149 N 1.6 5.1

1c) STABLE CONDITION (132kV BB2 Earth Q25 Closed)

Three phase voltage injected in 11kV side thru Bay K09(I/C-1)** and all CTs are normal PHASE Primary

current (A)

Test Plug (A) Diff. Display Measurement (A)

Relay Display (A)

132kV 11kV 132kV 11kV Diff. Rest 132kV 11kV

R 111 152 110 151 0 34.2 34.2 193

Y 111 150 111 153 0 34.2 389

B 110 151 110 151 0 33.0 388

N - - -

-REMARKS: 40 MVA Transformer diff Stability circuit found :- OK

B. 40 MVA TRANSFORMER HV REF PROTECTION STABILITY / SENSITIVITY TEST Phase CT Ratio : 300/1 A

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Neutral CT Ratio : 300/1 A Relay Setting (Is) :. A

Stabilizing resistor (final setting) : _ Ohm Stabilizing resistor set at : Ohm Transformer Tap position : 13

Primary current measured : A

(132kV Earth switch Q25 (BB2 ESW) Close (BUSBAR -2 under Shutdown)

B1

. HV REF STABILITY (Relay Type- RET615-ABB) Stable Condition (All CT’s are Normal)

Descript ion

Measured Current at Protection Panel E03+R (mA)

HV REF NCT (mA)

Voltage Measured Across Current RET615 F64HV 13&14 (mA) F64HV Relay Display (A) Resis. Current (mA) R Y B N

XA:21 XA:22 XA:23 XA:24 XA: 11&12 Relay RET615 F64HV (V) Metrosil RMHV (mV) Stabilize Resistor RSHV (mV) R Ph & Neut. Normal 100 31.0 29.0 37.5/ 37.2 0 0 0 0 0 0 0 Y Ph & Neut. Normal 31.2 104.1 31.2 28.8 39.2/ 40.0 0 47.8 47.3 0 0 0 B Ph & Neut. Normal 30.2 31.1 99.1 37.2 37.6/ 37.7 0 43 44.2 0 0 0 RYB 110 102 109 0 0 0 18.9 18.9 0 0 0

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Descript ion

Measured Current at Protection Panel E03+R (mA)

HV REF NCT (mA)

Voltage Measured Across Current RET615 F64HV 13&14 (mA) F64HV Relay Display (A) Resis. Current (mA) R Y B N

XA:21 XA:22 XA:23 XA:24 XA: 11&12 Relay RET615 F64HV (V) Metrosil RMHV (V) Stabilize Resistor RSHV (V) R ph Normal 93.7 38.4 37.9 18.9 29.9/ 29.6 0 30.2 30.1 48.2 15.0 48.1 Y ph Normal 37.7 96.7 38.9 20.5 31.8/ 31.8 0 32.5 32.5 51.3 16.2 51.9 B ph Normal 37.8 37.9 92.5 19 28.7/ 29.6 0 30.3 30.3 48.4 14.9 48.4

B3. HV REF Stable condition Descript

ion

Measured Current at Protection Panel E03+R (mA)

HV REF NCT (mA)

Voltage Measured Across Current RET615 F64HV 13&14 (mA) F64HV Relay Display (A) Resis. Current (mA) R Y B N

XA:21 XA:22 XA:23 XA:24 XA: 11&12 Relay RET615 F64HV (V) Metrosil RMHV (mV) Stabilize Resistor RSHV (mV) R Ph & Neut. Normal 100 31.4 31.3 37.8 37.6/ 37.5 0 19 90 0 0 0 Y Ph & Neut. Normal 31.2 104.3 31.2 39.8 40.1/ 40.1 0 44 44 0 0 0

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B Ph & Neut. Normal 30.7 30.5 100.2 36.9 37.3 / 37.6 0 42.5 42.5 0 0 0

REMARKS: 40MVA Transformer HV REF circuit found -:- OK

C. 40 MVA TRANSFORMER MV REF PROTECTION STABILITY / SENSITIVITY TEST Phase CT Ratio : 2500/1 A

Neutral CT Ratio : 2500/1 A Relay Setting (Is) : A

Stabilizing resistor (final setting) : _ Ohm Stabilizing resistor set at : Ohm Transformer Tap position : 13

Primary current measured : A

(132kV Earth switch Q25 (BB2 ESW) Close (BUSBAR -2 under Shutdown)

C1

. MV REF STABILITY (Relay Type- RET615-ABB) Descript

ion

Measured Current at Protection Panel E03+R (mA)

MV REF NCT (mA)

Voltage Measured Across Current RET615 F64MV 13&14 (mA) F64MV Relay Display (A) Resis. Current (A) R Y B N

XA:14 XA:15 XA:16 XA:17 XA: 18&19 Relay RET615 F64MV (mV) Metrosil RMMV (mV) Stabilize Resistor RSMV (mV) R Ph & Neut. Normal 183 0 0 183.5 183/ 181.7 0 35.5 0 0 0 0 Y Ph & Neut. Normal 0 187 0 187 187.9/ 187.8 0 105 105 0 0 0 B Ph & 0 0 181 179.8 178.9 / 0 23 22 0 0 0

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Neut. Normal

178.2

RYB 152 152 149 0 0 0 24.5 25.5 0 0 0

C2.

MV REF Sensitivity Test (Neutral side CT reversed) Descript

ion

Measured Current at Protection Panel E03+R (mA))

MV REF NCT (mA)

Voltage Measured Across Current RET615 F64MV 13&14 (A) F64MV Relay Display (A) Resis. Current (A) R Y B N

XA:14 XA:15 XA:16 XA:17 XA: 18&19 Relay RET615 F64MV (mV) Metrosil RMMV (V) Stabilize Resistor RSMV (V) R Ph 179 5.1 2.9 171.3 177.8/ 179 0 145 145 349 903 351 Y Ph 0 184 0 176 184/ 181.4 0 150.1 149.9 352 923 358 B Ph 0 0 178 169.7 175.1/ 178.2 0 145.9 145.2 346 898 349

C3

. MV REF Stable condition Descript

ion

Measured Current at Protection Panel E03+R (mA))

MV REF NCT (mA)

Voltage Measured Across Current RET615 F64MV 13&14 (A) F64MV Relay Display (A) Resis. Current (A) R Y B N

XA:14 XA:15 XA:16 XA:17 XA: 18&19 Relay RET615 F64MV (mV) Metrosil RMMV (V) Stabilize Resistor RSMV (V)

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R Ph 183 0.1 2.2 182.4 181.2/ 180.4 0 0 0 0 0 0 Y Ph 0.1 187 5.1 187.6 188.1/ 187.8 0 42.8 42.5 0 0 0 B Ph 0 0 182.4 180 179.8/ 180 0 20.7 20.9 0 0 0

REMARKS: 40MVA Transformer MV REF circuit found -:-

D1.Transformer O/C & E/F protection Core:- CT Ratio 300/1A

CT Details Phase Injected

Secondary Current [mA] – Monitored at: SWGR E03+S (mA) E03+R1, TB XC=

132kV Relay Panel (mA)

F51/51NHV-TB:X120 (mA) T1 1S1-1S2 O/C,E/F 300/1A R Y B N R Y B N R Y B N 502 505 508 514 01 02 03 04 3A 5A 7A 9A RN 101 31.5 31.5 37.7 101 31.2 31.8 37.8 YN 31.2 104 31.0 40 31 105 31 40 BN 31 30.3 101 37.9 31 31 101 37 RYB 110 105 110 0 110 111 110 0 F51/51NHV Display (A) R Y B N

IL1 IL2 IL3 IL4 31.8 9.9 9.9 11.9

9.9 32.6 9.9 12.6 9.8 9.8 31.5 11.9

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34.5 34.9 34.5 0

D2. Transformer MV NCT for SBEF protection Core: - CT Ratio 2500/1A

CT Details Phase Injected

Pri Current

(A)

Secondary Current [mA] – Monitored at: E03+R1, TB XC= 132kV Relay Panel Test plug X51NMV (RTXP18) +F51NMV (REF615) +F51NMV Display (A) CT4 Tr. MV SBEF 224, 225 @MK (TB X120) Relay 10 11 9A 10A 13,14 Io RN 183 179.9 183 183.4 183 183 476.0 YN 187 188 187 187 187 186 485 BN 182 182 181 183 181 182 471.3 RYB 0 0 0 0 0 0 0

D3. Transformer HV NCT for SBEF protection Core: - CT Ratio 300/1A

CT Details Phase Injected

Pri Current

(A)

Secondary Current [mA] – Monitored at: E03+R1, TB XC= 132kV Relay Panel Test plug X51NHV (RTXP18) +F51NHV (REF615) (TB X120) +F51NHV Display CT1 Tr. HV SBEF Tr (202) MK box N(220,221) S1 S2 A 6 7 9A 10A 13 14 Io RN 37.8 37.3 37 37.5 37.2 37.2 11.7 YN 39.0 39.5 39 39.6 39.9 39.9 12.5 BN 37.3 36.6 36.9 37.6 37.0 37.8 11.7 RYB 0 0 0 0 0 0 0

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CT Details Phase Injected

Pri Current

(A)

Secondary Current [mA] – Monitored at: E03+R1, TB XC= 132kV Relay Panel Test plug X51NT (RTXP18) +F51NT (REF615) (TB X120) +F51NT Display CT9 Tr. Tertiary SBEF Tr(202) MK box 3N(228,229) S1 S2 Io 13 14 9A 10A 13 14 A RN 0 0 0 0 0 0 0 YN 0 0 0 0 0 0 0 BN 0 0 0 0 0 0 0 RYB 0 0 0 0 0 0 0

11KV Panel side Display

results-:-A21-Siemens BCPU Relay 7SJ63

7SJ63Display R Y B N RYB

IL1 0.47 0 0 0.47 0.4 KA

IL2 0 0.47 0 0.47 0.4 KA

IL3 0 0 0.48 0.47 0.4 KA

IN 0.47 0.47 0.47 0 0 KA

AVR Panel & BCU Measurement:

Phases AVR (A) BCU (A) R 0 0 Y 0.2 482 B 0 0 RYB 0.2 393

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Winding Temperature CT Measurements:

HV Temp CT Ratio: 250/2A

MV Temp CT Ratio: 2050/2A

Injection LCC RCC Main Tariff Check Tariff

R Y B N R Y B N R Y B R Y B R 30/154 0/48 0/47 - 30/150 0/47 0/47 - 0.5 0 0 0.5 0 0 Y 0/48 30/157 0/48.2 - 0/46 30/153 0/48 - 0 0.5 0 0 0.5 0 B 0/47 0/47 30/152 - 0/47 0/47 30/151 - 0 0 0.5 0 0 0.5 RYB 30/165 30/167 30/166 - 30/162 30/164 30/163 - 0.4 0.4 0.4 0.4 0.4 0.4 RTU R Y B N R 153 47 47 Y 47 157 48 -B 47 47 152 -RYB 164 168 165

-Remarks -:- CT circuits for Tr Diff.Stability, HV & MV REF stable confirmed.

** Three phase generator voltage injected through K11 spare bay at 11kV side

Phases HV Temp Sec.Current MV Temp Sec. Current

R 0 0

Y 245 462

B 0 0

References

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