T1 Transforemer Stability Test Report

SITE TEST REPORT

Replacement of 132/11kV Transformers, Transformer Protection Panels and 110 V Batteries at W13 Substation

(CONTRACT No. N6399)

Consultant ENERGO Name of the Equipment 40MVA Power Transformer-T201Name of the Feeder E03 / K09 Transformer Feeder

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Manufacturer ABBDate 20.02.2013 – 10

40 MVA Power Transformer Stability Test1. 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

WINDIN

G

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

Tested by Witnessed by Approved byABB Transmission &

Distribution ENERGODate 20.02.2013 20.02.2013Name R.Krishna Murthy Mohammad Rasheed

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CT ratio for 11kV Line side CT’s = 2500/1A

The CT T3 used For REF protection at HV side (F64HV)


CT ratio for HV neutral side= 300/1A

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


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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Three phase voltage injected in 11kV side thru Bay K09(I/C-1), K11 and all CTs are normal

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)


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)


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



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Phase CT Ratio : 300/1 A

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.

Norma

l

100 31.0 29.037.5/

37.20 0 0 0 0 0 0

Y Ph &

Neut.

Norma

l

31.2 104.1 31.2 28.839.2/

40.00 47.8 47.3 0 0 0

B Ph &

Neut.

Norma

30.2 31.1 99.1 37.2 37.6/

37.7

0 43 44.2 0 0 0



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l

RYB 110 102 109 0 0 0 18.9 18.9 0 0 0

B2. HV REF Sensitivity Test (Neutral side CT reversed)

Descript

ion

Measured Current at


HV

REF

NCT

(mA)


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

Normal93.7 38.4 37.9 18.9

29.9/

29.60 30.2 30.1 48.2 15.0 48.1

Y ph

Normal37.7 96.7 38.9 20.5

31.8/

31.80 32.5 32.5 51.3 16.2 51.9

B ph

Normal37.8 37.9 92.5 19

28.7/

29.60 30.3 30.3 48.4 14.9 48.4

B3. HV REF Stable condition

Descript

ion

Measured Current at


HV

REF

NCT

(mA)


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.

100 31.4 31.3 37.8 37.6/

37.5

0 19 90 0 0 0



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Norma

l

Y Ph &

Neut.

Norma

l

31.2 104.3 31.2 39.840.1/

40.10 44 44 0 0 0

B Ph &

Neut.

Norma

l

30.7 30.5 100.2 36.937.3 /

37.60 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


MV REF

NCT

(mA)


RET615

F64MV

13&14

(mA)

F64MV

Relay

Display

(A)

Resis.

Current

(A)

R Y B N

XA:14 XA:15 XA:16 XA:17XA:

18&19

Relay

RET615

F64MV

(mV)

Metrosil

RMMV

(mV)

Stabilize

Resistor

RSMV

(mV)



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R Ph &

Neut.

Norma

l

183 0 0 183.5183/

181.70 35.5 0 0 0 0

Y Ph &

Neut.

Norma

l

0 187 0 187187.9/

187.80 105 105 0 0 0

B Ph &

Neut.

Norma

l

0 0 181 179.8178.9 /

178.20 23 22 0 0 0

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)


RET615

F64MV

13&14

(A)

F64MV

Relay

Display

(A)

Resis.

Current

(A)

R Y B N

XA:14 XA:15 XA:16 XA:17XA:

18&19

Relay

RET615

F64MV

(mV)

Metrosil

RMMV

(V)

Stabilize

Resistor

RSMV

(V)

R Ph 179 5.1 2.9 171.3177.8/

1790 145 145 349 903 351

Y Ph 0 184 0 176184/

181.40 150.1 149.9 352 923 358

B Ph 0 0 178 169.7175.1/

178.20 145.9 145.2 346 898 349



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C3. MV REF Stable condition

Descript

ion

Measured Current at

Protection Panel E03+R (mA))

MV REF

NCT

(mA)


RET615

F64MV

13&14

(A)

F64MV

Relay

Display

(A)

Resis.

Current

(A)

R Y B N

XA:14 XA:15 XA:16 XA:17XA:

18&19

Relay

RET615

F64MV

(mV)

Metrosil

RMMV

(V)

Stabilize

Resistor

RSMV

(V)

R Ph 183 0.1 2.2 182.4181.2/

180.40 0 0 0 0 0

Y Ph 0.1 187 5.1 187.6188.1/

187.80 42.8 42.5 0 0 0

B Ph 0 0 182.4 180179.8/

1800 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

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



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300/1A 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 IL431.8 9.9 9.9 11.9

9.9 32.6 9.9 12.6

9.8 9.8 31.5 11.9

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)


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)


E03+R1, TB XC=

132kV Relay Panel

Test plug X51NHV

(RTXP18)

+F51NHV (REF615)

(TB X120)

+F51NHV

Display



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CT1

Tr. HV

SBEF

Tr (202) MK boxN(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

D4. Transformer Tertiary Wdg CT for SBEF protection Core:- CT Ratio 300/1A

CT Details

Phase

Injected

Pri

Current

(A)


E03+R1, TB XC=

132kV Relay Panel

Test plug X51NT

(RTXP18)

+F51NT (REF615)

(TB X120)+F51NT Display

CT9

Tr. Tertiary

SBEF

Tr(202) MK box3N(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



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AVR Panel & BCU Measurement:

PhasesAVR

(A)

BCU

(A)

R 0 0

Y 0.2 482

B 0 0

RYB 0.2 393

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 -



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Phases HV Temp Sec.Current MV Temp Sec. CurrentR 0 0Y 245 462B 0 0

RYB 270 370.9

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

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



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T1 Transforemer Stability Test Report

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