Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY STABILITY
Bay no.: Contractor:
Record No.: Sheet: of ! Substation No :
Drawing ref.: ref.: Contract no.:
"ENERA "ENERAL L DAT DATA AND AND INFORM INFORMA ATION TION
Designation No. TRF anufacture anufacture Rating %inding #ector &roup ()pedance * No. of Taps Ratio
TR. Dierential Relay Type Type TR.R.!.F TR.R.!.F Relay Type "# CT Ratio '# CT Ratio "# BCT Ratio '# BCT Ratio ain Tap: $
+#
$
Class:
$
Class:
$ Class: $ Class: 'ast Tap: $ +#
# Transfor) Transfor)er er Stability and Sensiti,ity Test -rocedure -rocedure b/ecti,e: The ob/ecti,e of this test is con0r) con0r) that the dierential dierential relay or R!F R!F relay doesn1t operate at nor)al conditions e,en though load currents currents are high2 where where (t should operate when a fault occurs occurs in its 3one. # Source: Suitable 4 phase generator 5Separate6 7 489 ,olt 7 9 "3 or Suitable #oltage. S!C supply. $ -recautions: &ood earth of: ; The &enerator. &enerator. < The Transfor)er Transfor)er.. 4 The shield of the cables. # The correct correct si3e of connected testing cables. cables. $Deter)ine wor=ing 3ones and places and pre,enting any person to be in these 3ones. %Suitable CB for 4>phase supply. &CT ter)inal bloc=s )ust be chec=ed and tightness well. !?ll R!F 5Restricted !arth Fault6 relays )ust be re)o,ed or its CT ter)inal shorted. 'Chec= the -hase Se@uence of the 4>-hase Supply. ( Test Test e@uip)ents and tools: tools: − Calibrated )ulti>)eters. T e s t e dby : Si gnat ur e& Dat e :
EN")
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
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− Calibrated testers for )easure current and phase angle. % Calculation:
The following calculation is as a general eAa)ple.
Technical Data of -ower Transfor)er: * Two winding > three phase > nyn9d; transfor)er. * ;4<$;4.8 +#. * 9 #?. * Rated current <<.4 $ <;9.<< ?. * "# CTR E 499$;. * '# CTR E 4999$;. * -ercentage i)pedance: ?t Tap ' E <.;4 * ?t Tap N E <4.G * ?t Tap ;;R E <;.8 * Calculation: ?t nor)al tap.
*
".# side: 60 × 10
I 1 p =
3 × 132 × 10
IPCT =
*
6
1 0.875
3
= 262.43 A
= 1.14
'# Side: I 2 s =
i2 =
Si gnat ur e& Dat e :
EN")
6
3 × 13.8 × 10
2510.22 3000 1
IPCT =
T e s t e dby :
60 × 10
=
1 0.837
3
= 2510.22 A
0.837 A
= 1.2
Wi t ne s s e dby : Si g nat ur e& Dat e :
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Record No.: Sheet: $ of ! Substation No :
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( KV ) Z ( Ω ) = Z % × 2
MVA
(13.8 ) = 0.797848Ω Z ( Ω ) = 0.25137 2
60
?t Tap ' %hen we apply 489 # power supply at '# side 380
I 2( LV ) =
i2 =
3
0.797848
274.981 3000
=
=
274.981 A
91.7 mA
i 2′ = 91.7 ×
1.2 3
= 63.5mA
After IPCT I 1( HV ) =
i1 =
274.981 ×
28.74 300
=
13.8 132
=
28.74 A
95.8mA i1′ = 95.8 ×
1.14 3
= 77.44mA
After IPCT
?t Tap N
(13.8 ) = 0.748874Ω Z ( Ω ) = 0.23594 2
60
%hen we apply 489 # power supply at '# side I 2( LV ) =
i2 =
380
3
0.748874
292.96 3000
=
=
292.96 A
97.65mA
i 2′ = 97.65 ×
1.2 3
= 67.67 mA
After IPCT I 1( HV ) =
T e s t e dby : Si gnat ur e& Dat e :
EN")
292.96 ×
13.8 132
=
30.62 A
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor: 30.62 300
= 102.8mA
i1′ = 102.8 ×
1.14 3
After IPCT
Sheet: % of ! Substation No :
Drawing ref.: Contract no.: i1 =
Record No.:
=
67.19mA
?t Tap ;;R
(13.8 ) = 0.693456Ω Z ( Ω ) = 0.21848 2
60
%hen we apply 489 # power supply at '# side I 2( LV ) =
i2 =
380
3
0.693456
316.38 3000
= 316.38 A
= 105.49mA
i 2′ = 105.49 ×
1.2
After IPCT I 1( HV ) =
i1 =
33.08 300
316.08 ×
13.8 132
=
3
=
73.06mA
33.08 A
= 110.25mA
i1′ = 110.25 ×
1.14
After IPCT
3
=
72.57mA
& Final setting testing chec=: #
Chec= the 0nal setting of the dierential relay. Chec= the 0nal setting of the R!F relays.
! Transfor)er dierential stability and sensiti,ity test for tap no >>>>>>
stability test ;
T e s t e dby :
-ri)ary )easure)ents
B>REN") >B
Si gnat ur e& Dat e :
R>
Source N
#H( Bessedby: Wi t n
Si g nat ur e& Dat e :
EN")R
# 5#6 ( 5?6
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
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< Di. relay 5'# side6
Di. relay 5"# side6
( T.B. 5)?6
( 5)?6
'# Side T.B.
( sec. 5)?6
T.B.
Secondary )easure)ents -has e
"# Side ( pri. 5?6
( sec. T.B. 5)?6
( pri. 5?6
R B N
T e s t e dby : Si gnat ur e& Dat e :
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Sheet: ! of ! Substation No :
Drawing ref.: Contract no.:
4
Dierential Relay Current easure)ent 5for Digital relays6
D(FF Relay easure)ent "# side current ?
-has e
Record No.:
D(FF Relay easure)ent '# side current ?
D(FF Current (d )?
Restrain Current (R )?
R B #
Sensiti,ity Test by swapping CT Ter)inals : ;
Di. relay 5'# side6
Di. relay 5"# side6
( 5)?6
( 5)?6
T.B.
'# Side
T.B .
( T.B sec. . 5)?6
Secondary )easure)ents -has e
"# Side ( pri. 5?6
( sec. T.B. 5)?6
( pri. 5?6
R B N <
-hase
Dierential Relay Current easure)ent 5for Digital relays6
D(FF Relay easure)ent "# side current ?
D(FF Relay easure)ent '# side current ?
D(FF Current (d )?
R B
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Restrain Current (R )?
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
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' Transfor)er dierential stability and sensiti,ity test for tap no >>>>>> stability test
;-ri)ary )easure)ents
B>R
>B
Source N
R>
B
#H(
R
# 5#6 ( 5?6
T.B.
Di. relay 5"# side6 ( 5)?6
T.B.
'# Side ( sec. 5)? 6
T.B.
-has e
"# Side ( sec. T.B 5)? . 6
( pri. 5?6
( pri. 5?6
R B N 4Dierential Relay Current easure)ent5for Digital relays6
-has e
D(FF Relay easure)ent "# side current ?
D(FF Relay easure)ent '# side current ?
D(FF Current (d )?
Restrain Current (R )?
R B
#Sensiti,ity Test by swapping CT Ter)inals : T e s t e dby : Si gnat ur e& Dat e :
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Wi t ne s s e dby : Si g nat ur e& Dat e :
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Record No.: Sheet: ( of ! Substation No :
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;Secondary )easure)ents
Di. relay 5'# side6 ( 5)?6
T.B.
Di. relay 5"# side6 T.B ( 5)?6 .
'# Side ( sec. T.B. 5)?6
-has e
"# Side ( pri. 5?6
( sec. T.B. 5)?6
( pri. 5?6
R B N
-has e
D(FF Relay easure)ent "# side current ?
D(FF Relay easure)ent '# side current ?
D(FF Current (d )?
Restrain Current (R )?
R B
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
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( Transfor)er dierential stability and sensiti,ity test for tap no >>>>>>
stability test
;-ri)ary )easure)ents : B>R
>B
Source R> N
#H( B
R # 5#6 ( 5?6
T.B.
Di. relay 5"# side6 ( 5)?6
'# Side
T.B.
( T.B sec. . 5)?6
-has e
"# Side ( pri. 5?6
( T.B sec. . 5)?6
( pri. 5?6
R B N 4Dierential Relay Current easure)ent 5for Digital relays6
-has e
D(FF Relay easure)ent "# side current ?
D(FF Relay easure)ent '# side current ?
D(FF Current (d )?
R B
T e s t e dby : Si gnat ur e& Dat e :
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Restrain Current (R )?
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Sheet: , of ! Substation No :
Drawing ref.: Contract no.:
#
Di. relay 5'# side6 ( 5)?6
Sensiti,ity Test by swapping CT Ter)inals :
Di. relay 5"# side6
T.B.
( 5)?6
Record No.:
;Secondary )easure)ents -has "# Side e
'# Side ( sec. T.B. 5)?6
T.B.
( sec. 5)? 6
( pri. 5?6
T.B .
( pri. 5?6
R B N
-hase
D(FF Relay easure)ent "# side current ?
D(FF Relay easure)ent '# side current ?
D(FF Current (d )?
Restrain Current (R )?
R B + Stability ?nd Sensiti,ity f R!F "# Side ?t Tap No >>>>
#RNE IIIIIII Connected Supply to -hase
( pri)ary 5?6
#NE IIIIIII
#BNE IIIIIII
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) ( 5)?6
(5)?6
T.B. No T e s t e dby : Si gnat ur e& Dat e :
EN")
Stability test
Wi t ne s s e dby : Si g nat ur e& Dat e :
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R!F relay ( 5)?6
# 5#6
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Record No.: Sheet: of ! Substation No :
Drawing ref.: Contract no.:
R>N >N B>N #
Connected Supply to -hase
( pri)ar y 5?6
Sensiti,ity Test by Swapping CT Ter)inals :
easured ( secondary %ire Fro) neutral %ire Fro) CT1s CT su) ( 5)?6
R!F relay # ( 5)?6 5#6
( 5)?6
T.B. No R>N >N B>N , Stability and sensiti,ity of R!F "# Side at Tap No >>>>
Stability and sensiti,ity of R!F "# Side at Tap No >>>>
#RNE IIIIIII Connected Supply to -hase
( pri)ary 5?6
#NE IIIIIII
#BNE IIIIIII
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) (5)?6
R!F relay ( 5)?6
# 5#6
(5)?6
T.B. No R>N >N B>N #
Connected Supply to -hase
( pri)ary 5?6
Sensiti,ity Test by Swapping CT Ter)inals :
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) (5)?6
R!F relay ( 5)?6
(5)?6
T.B. No R>N T e s t e dby : Si gnat ur e& Dat e :
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Wi t ne s s e dby : Si g nat ur e& Dat e :
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# 5#6
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Record No.: Sheet: # of ! Substation No :
Drawing ref.: Contract no.:
>N B>N
Stability and sensiti,ity of R!F "# Side at Tap No >>>>
#RNE IIIIIII Connected Supply to -hase
( pri)ary 5?6
Stability and sensiti,ity of R!F "# Side at Tap No >>>> #NE IIIIIII
#BNE IIIIIII
easured ( secondary %ire Fro) neutral %ire Fro) CT1s su) CT (5)?6
R!F relay ( 5)?6
# 5#6
(5)?6
T.B. No R>N >N B>N #
Connected Supply to -hase
( pri)ary 5?6
Sensiti,ity Test by Swabing CT Ter)inals :
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) (5)?6
R!F relay ( 5)?6
(5)?6
T.B. No R>N >N B>N
T e s t e dby : Si gnat ur e& Dat e :
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# 5#6
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Record No.: Sheet: $ of ! Substation No :
Drawing ref.: Contract no.:
# Stability and sensiti,ity of R!F '# Side at Tap No >>>>
#RNE IIIIIII Connected Supply to -hase
( pri)ary 5?6
Stability and sensiti,ity of R!F "# Side at Tap No >>>> #NE IIIIIII
#BNE IIIIIII
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) (5)?6
R!F relay ( 5)?6
# 5#6
(5)?6
T.B. No R>N >N B>N #
Connected Supply to -hase
( pri)ary 5?6
Sensiti,ity Test by Swapping CT Ter)inals :
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) (5)?6
R!F relay ( 5)?6
(5)?6
T.B. No R>N >N B>N
T e s t e dby : Si gnat ur e& Dat e :
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# 5#6
Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Drawing ref.: Contract no.:
Record No.: Sheet: % of ! Substation No :
$ Stability and sensiti,ity of R!F '# Side at Tap No >>>>
Stability and sensiti,ity of R!F "# Side at Tap No >>>>
#RNE IIIIIII Connected Supply to -hase
#NE IIIIIII
#BNE IIIIIII
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su)
( pri)ary 5?6
(5)?6
R!F relay ( 5)?6
# 5#6
(5)?6
T.B. No R>N >N B>N #
Connect ed Supply to -hase
( pri)ary 5?6
Sensiti,ity Test by Swapping CT Ter)inals : easured ( secondary %ire Fro) %ire Fro) neutral CT CT1s su) (5)?6
R!F relay ( # 5#6 5)?6
(5)?6
T.B. No R>N >N B>N
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
Record No.: Sheet: & of ! Substation No :
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% Stability and sensiti,ity of R!F '# Side at Tap No >>>>
Stability and sensiti,ity of R!F "# Side at Tap No >>>>
#RNE IIIIIII Connect ed Supply to -hase
( pri)ar y 5?6
#NE IIIIIII
#BNE IIIIIII
easured ( secondary %ire Fro) %ire Fro) neutral CT CT1s su) (5)?6
R!F relay ( 5)?6
# 5#6
(5)?6
T.B. No R>N >N B>N #
Connected Supply to -hase
( pri)ary 5?6
Sensiti,ity Test by Swapping CT Ter)inals :
easured ( secondary %ire Fro) %ire Fro) CT1s neutral CT su) (5)?6
R!F relay ( 5)?6
# 5#6
(5)?6
T.B. No R>N >N B>N
AL*BABTAIN
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Commissioning Service Department Commissioning Standard Test Formats Description: TEST
TRANSFORMER STABILITY
Bay no.: Contractor:
T e s t e dby : Si gnat ur e& Dat e :
Drawing ref.: Contract no.:
EN")
Record No.: Sheet: ! of ! Substation No :
Wi t ne s s e dby : Si g nat ur e& Dat e :
EN")
