ct vt calculation al ain rev.2

7/24/2019 CT VT Calculation Al AIN Rev.2

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33/11kV S/S IN AL AIN AREAINDEX

CT / VT PARAMETER CALCULATION

Description Sheets

A. CT Parameter Calculation 3 TO 27

1 33kV Cable Feeder -Directional O er Current ! "art# Fault Protection $%7&%7'( 3 TO 4

2 33kV Cable Feeder -Pilot )ire Protection- $*+( + TO +

3 33kV Cable Feeder -,eterin % TO 7

4 33kV u/ ar Differential Protection 0ine Feeder $*7 ( * TO

+ 33kV u/ ar Differential Protection Tran/former Feeder $*7 ( 1 TO 1

% 33kV Tran/former Feeder -,eterin 11 TO 12

7 33 11kV Tran/former Differential Protection Calculation $*7T( 13 TO 1%

* 33kV Tran/former Feeder -Directional O er Current Protection $+1-+1'( 17 TO 1*

33 11kV Tran/former Feeder - e/tricted "art# Fault Protection- $%4 ( 1 TO 21

1 33 11kV Tran/former Feeder -5tand 6 "art# Fault Protection $5 "F( 22 TO 23

11 11kV Cable Ca acitor ank Feeder -Directional O er Current Protection $+1-+1'( 24 TO 2+

12 11kV Tran/former Feeder -Directional O er Current Protection $+1-+1'( 2% TO 27

. VT Parameter Calculation 2* TO 3+

1 33kV 08'" VT - ,"T" 8'9 2* TO 2

2 33kV 08'" VT- P OT"CT8O' 3 TO 31

3 33kV :5 VT 32 TO 33

4 11kV :5 VT 34 TO 3+

C. 5ummar6 5#eet 3% TO 37

D. 0i/t of catalo ue eference/ 3* TO 3*

LARSEN TOU!RO LIMITEDECC Di"ision # EDRC $E%ectric&%'


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LARSEN & TOUBRO LIMITEDECC Division - EDRC (Electrical)

P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A

P "P C=>D APP D DAT"T8T0" < CT Parameter Calculation/

A;8V 5>A A>5 > ; 7. 4.2 4

1 33kV C&(%e )ee*er #Direction&% O"er C+rrent E&rth )&+%t Protection $,-.,-N'

1 1 The CT *et&i%sCurrent Tran/former ? CT-F1& CO "-1

ated Primar6 Current 8 n ? % -4 1Aated 5econdar6 Current 8/n ? 1 A

CT Cla// ? + P 25econdar6 )indin e/i/tance ct ? 2 O#m/ at 4 A ta5elected Ta ? 4 A

1 0 Ass+ ptions D APP D DAT"T8T0" < CT Parameter Calculation/

A;8V 5>A A>5 > ; 7. 4.2 4

1 , !+r*en Det&i%s5.'o. De ice urden ,ake

a. Directional O er Current ela6 .1 5PA5 34* C& Ab. Directional "art# Fault ela6 .1 "; +27& Ac. 0ead urden .33

Tot&% !+r*en .+3

1 - Acc+r&c2 Li it )&ctor o4 the CT A / e uirement n E 8kma@ 8n

8kma@ ? =i #e/t Fault Current8n ? 'ominal Primar6 Current of t#e CT ? 4 A

=ence a/ Per A $n ( mu/t be reater t#an E 31+ 4E 7

eal accurac6 0imit Factor n ? n @

n ? CT rated Accurac6 0imit Factor ? 2

? ated CT Po er ? 1+ VA C#o/en Value

? ? 2 )att/

? urden at ated Current ? .+3n ? 2 @ $1+. 2. ( $ .+3 2. (

? 134

n ? 134 E 7 & /o t#e current tran/former /ati/fie/ t#e re uirement.

1 6 Conc%+sionCT atio 5elected ? ,77# 77/1A5elected Ta ? 77 ACT 5econdar6 e/i/tance ? 0 Oh s

ated VA of t#e CT core 5elected for Directional? 15 VA Accurac6 Cla// ? 5 P 07

ated Continuou/ T#ermal Current ? 157 8ated 5#ort Time T#ermal Current ? 31 5 kA 4or 3 Sec

$P' P " (

$P P " (

P 'P " CT 8nternal 0o//e/ 8 n

2 @ ct

P


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A

P "P C=>D APP D DAT"T8T0" < CT Parameter Calculation/A;8V 5>A A>5 > ; 7. 4.2 4

0 33kV C&(%e )ee*er #Pi%ot 9ire Protection# $65'

0 1 The CT *et&i%sCurrent Tran/former ? CT-F1 CO "-2


CT Accurac6 Cla// ? G5econdar6 )indin e/i/tance ct ? 2 O#m/ at 4 A ta5elected Ta ? 4 A

0 0 Ass+ ptions nee Point Volta e 5elected E? 77 V,a neti/in Current at Vk 2 H? 37 A

ated Continuou/ T#ermal Current ? 157 8


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A

P "P C=>D APP D DAT"T8T0" < CT Parameter Calculation/A;8V 5>A A>5 > ; 7. 4.2 4

ated 5#ort Time T#ermal Current ? 31 5 kA 4or 3 Sec


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

3 33kV C&(%e )ee*er #Meterin;

3 1 The CT *et&i%sCurrent Tran/former ? CT-F1 CO "-3


CT Cla// ? .+ 55econdar6 )indin e/i/tance ct ? 2 O#m/ at 4 A ta5elected Ta ? 4 A


A;8V 5>A A>5 > ; 7. 4.2 4

'ote D APP D DAT"T8T0" < CT Parameter Calculation/

A;8V 5>A A>5 > ; 7. 4.2 4

For 8kma@ 8n calculated abo e n ? $from A / ela6 Catalo ue($Fi ure-1 Pa e 3 3(

n ? 3 * E & /o t#e current tran/former /ati/fie/ t#e re uirement.

& 11kV Si*e A/ er ela6 manufacturer/ Catalo ue

n H? n @

)#eren ? "ffecti e accurac6 limit Factor

? Nominal current Related to Protected Ob ect !1+ / rt$3( 11.++ ? 7+ A

? Nominal current of "# ! *n ? CT rated Accurac6 0imit Factor ? 37 $Calculated elo (

? ated CT Po er ? 1 VA $5elected Value(

? ? 4 )att/

? urden at ated Current ? .43

? ,a@imum Primar6 t#rou # fault current? %. % kAFor a cla// G Current Tran/former& e ui alent alue of CT rated accurac6 cla// factor $n(

n ? :k @ 8n/ec @ 1.3

)#ere:k ? CT >nee oint Volta e ? 4 V $5elected Value(n ? CT rated Accurac6 0imit Factor ? 37.1 $Calculated elo (n ? $4 @ [email protected]( $1 4(

? 37=ence&n ? 37 @ $1 4( @ *

$ .43 4( @ 7+n ? 12+For t#e /6/tem under con/ideration ? 8kma@ 8n

? % +% 7+? *. *

For 8kma@ 8n calculated abo e n ? *.+ $from A / ela6 Catalo ue()#ere $Fi ure-1 Pa e 3 3(8kma@ ? =i #e/t t#rou # Fault Currentn ? 125 E *.+ & /o t#e current tran/former /ati/fie/ t#e re uirement.

$P' P " (@ 8' of CT$P P " (@8'

8'

8' of CT


2 @ ct

P

8kma@

P ' P "


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

- - Conc%+sionCT atio 5elected for 33kV 5ide ? ,77#377/1 ACT atio 5elected for 11kV 5ide ? 1777#677/1 A

ated VA of t#e CT on 33kV 5ide ? 17 VAated VA of t#e CT on 11kV 5ide ? 17 VA

5elected Ta on 33kV 5ide ? 377 A5elected Ta on 11kV 5ide ? 677 ACT 5econdar6 e/i/tance on 33kV /ide ? 1 5 Oh sCT 5econdar6 e/i/tance on 11kV /ide ? Oh s

Accurac6 Cla// ? X8 ma neti/in ? 37 A B Vk/0>nee oint Volta e on 33kV 5ide ? 77>nee oint Volta e on 11kV 5ide ? 77



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

6 33kV Tr&ns4or er )ee*er #Direction&% O"er C+rrent Protection $51#51N'

6 1 The CT *et&i%sCurrent Tran/former ? CT-T1-1&CO "-4


CT Cla// ? + P 25econdar6 )indin e/i/tance ct ? 1.+ O#m/ at 3 A ta5elected Ta ? 3 A


A;8V 5>A A>5 > ; 7. 4.2 4

For t#e 56/tem under Con/ideration


)#eren ? CT rated Accurac6 0imit Factor ? 2


? ? 1.+ )att/

? urden at ated Current ? .43n ? 2 @ $1 1.+( $ .43 1.+(

? 11

n ? 11 E 1 + & /o t#e current tran/former /ati/fie/ t#e re uirement.

6 - Conc%+sionCT atio 5elected ? ,77#377/1A5elected Ta ? 377 A

CT 5econdar6 e/i/tance ? 1 5 Oh sated VA of t#e CT core ? 17 VA

Accurac6 Cla// ? 5 P 07ated Continuou/ T#ermal Current ? 157 8ated 5#ort Time T#ermal Current ? 31 5 kA 4or 3 Sec

$P' P " (

$P P " (


2 @ ct

P


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

33/11kV Tr&ns4or er )ee*er #Restricte* E&rth )&+%t Protection# $, R'

1 The CT *et&i%sCurrent Tran/former ? CT-T1-' CO "-1

ated Primar6 Current 8 n ? 1 -* 1Aated 5econdar6 Current 8/n ? 1 A

CT Cla// ? G5econdar6 )indin e/i/tance ct ? 4 O#m/ at * A ta5elected Ta ? * A8 ma neti/in ? 3 mA B Vk 2

0 Ass+ ptions nee Point Volta e Vk ? 2 :/

)#ere :/ i/ t#e Volta e /ettin of t#e ela6

T#e /ettin Volta e Us > Ik &@/n @ $ Rct ? 0 RL'


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

8kma@ ? ,a@imum t#rou # fault current for #ic# rela6mu/t not o erate

n ? Current Tran/former turn/ ratioct ? 5econdar6 e/itance $ O#m/(0 ? Total re/i/tance of t#e lon e/t mea/urin circuit

:/ ? 74 *.1 * $4 .33(:/ ? 4 .%

5et alue of :/ ? +=ence >nee oint olta e E? 2:/

E? 2 @ +E? 1

>nee oint Volta e /elected :k E? 1a ro@.

Ado ted Value of :k ? 4 V

- Sensiti"it2 CheckT#e Primar6 o eratin Current 8o ? n @ $ 8r m J 8e 8u(

n ? CT tran/formation ratio? 677

8r ? ela6 O eratin Current E? mJ8e? 37 A8e ? Current Tran/former ,a . Current at

/ettin olta e? $3 @+ ( $4 2(? - 5 A

m ? 'umber of CT / in t#e differential current circuit? Nos

8u ? Current t#rou # ari/tor at :/? 17 A $%s &er Relay "atalogue for SP%' 115"(

$)igure*+, O&erating "-aracterstic of t-e oltage de&endant Resistor($ Voltage /e&endant Resistor #y&e 50+ 31*"(

=ence& t#e rimar6 o eratin Current ? 677 $ 7 737 ? @7 776 ? 7 717'? +%

6 V&%+e o4 st&(i%isin; Resistor $Rs',a@imum Po//ible alue of :/ ? + V,inimum alue of /tart Current 8r ? 3 mA $8t i/ m @ 8e a/ recommended in

t#e catalo ue for 5PA; 11+C(Value of /tabili/in e/i/tor $ /( ? :/ 8r

? 1%%%.7 O#m/ T6 e - $+24* *31-C(


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

T#e in ut 8m edance of t#e 5PA;11+C rela6 ? .1 O#m/5ince t#e in ut im edance of t#e rela6 i/ ne li ible in com ari/on to t#e alue of /tabili/in re/i/tor& t#e /ame i/ not /ub/tracted from t#e calculated alue of / abo e.

Conc%+sionCT atio 5elected ? 1777#677/1A5elected Ta ? 677 ACT 5econdar6 e/i/tance ? Oh s

ated VA of t#e CT core 5elected for e/tricted? 17 VA"art# fault rotection,inimum >nee oint Volta e e uirement ? 77 V

Accurac6 Cla// ? X8 ma neti/in ? 37 A B Vk/0



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

17 33/11kV Tr&ns4or er )ee*er #St&n* !2 E&rth )&+%t Protection $S!E)'

17 1 The CT *et&i%sCurrent Tran/former ? CT-T1-' CO "-2


CT Cla// ? + P 25econdar6 )indin e/i/tance ct ? 4 O#m/ at * A ta5elected Ta ? * A


A;8V 5>A A>5 > ; 7. 4.2 4

? urden at ated Current ? .43P


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

n ? 2 @ $1+. 4. ( $ .43 4. (? *%

n ? *% E 3 & /o t#e current tran/former /ati/fie/ t#e re uirement.17 , Conc%+sion

CT atio 5elected ? 1777#677/1A5elected Ta ? 677 ACT 5econdar6 e/i/tance ? Oh s

ated VA of t#e CT core 5elected for ,eterin ? 17 VA Accurac6 Cla// ? 5 P 07



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

11 11kV C&(%e/C&p&citor !&nk )ee*er #Direction&% O"er C+rrent Protection $51#51N'

11 1 The CT *et&i%sCurrent Tran/former ? CT-2& 4 CO "-1


CT Cla// ? + P 25econdar6 )indin e/i/tance ct ? 1.+ O#m/ at 3 A ta5elected Ta ? 3 A


A;8V 5>A A>5 > ; 7. 4.2 4

10 11kV Tr&ns4or er )ee*er #Direction&% O"er C+rrent Protection $51#51N'

10 1 The CT *et&i%sCurrent Tran/former ? CT-T1-2& CO "-4


CT Cla// ? + P 25econdar6 )indin e/i/tance ct ? 4 O#m/ at * A ta5elected Ta ? * A


A;8V 5>A A>5 > ; 7. 4.2 4

For t#e 56/tem under Con/ideration


)#eren ? CT rated Accurac6 0imit Factor ? 2


? ? 4 )att/

? urden at ated Current ? .21n ? 2 @ $1 4. ( $ .21 4. (

? %7

n ? %7 E 3 & /o t#e current tran/former /ati/fie/ t#e re uirement.

10 - Conc%+sionCT atio 5elected ? 1777#677/1A5elected Ta ? 677 A

CT 5econdar6 e/i/tance ? Oh sated VA of t#e CT core 5elected for Directional? 17 VA

O ercurrent "art# fault rotection Accurac6 Cla// ? 5 P 07


$P' P " (

$P P " (


2 @ ct

P


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A

P "P C=>D APP D DAT"T8T0" < VT Parameter Calculation/

A;8V 5>A A>5 > ; 7. 4.2 4

1 33kV LINE VT # METERIN

1 1 VT Det&i%sVT > PT-F1& CO "-1Volta e atin > 33/3 / 110/3

VA atin > 100 VACore-1 > Cl


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

1 3 Conc%+sion Actual urden of t#e 0ine-1 VT Core-1 < 1 - VA5elected Parameter/VA ratin 5elected < 177 7 VA

Accurac6 Cla// of Core-1 < C% 1


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

0 33kV LINE VT# PROTECTION

0 1 VT Det&i%sVT > PT-F1& CO "-2Volta e atin > 33/3 / 110/3



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

0 3 Conc%+sion Actual urden of t#e 0ine-1 VT Core-2 < 7 63 VA5elected Parameter/VA ratin 5elected < 57 7 VA

Accurac6 Cla// of Core-2 < C% 3P


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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

3 33kV !US VT

3 1 VT Det&i%sVT > PT- :5-1& CO "-1Volta e atin > 33/3 / 110/3



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

3 3 Conc%+sion Actual urden of t#e 0ine-1 VT Core-1 < 1 - VA5elected Parameter/VA ratin 5elected < 177 7 VA



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

11kV !US VT

1 VT Det&i%sVolta e atin > 11/3 / 110/3



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P O;"CT < 33 11kV 5 5 8' A0 A8' A "A ef < 914 -- 0744 ;3+3 A


A;8V 5>A A>5 > ; 7. 4.2 4

3 Conc%+sion Actual urden of t#e 11kV Feeder VT Core-1 < 1 - VA5elected Parameter/VA ratin 5elected < 177 7 VA



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Re"ision A D&te - 7

S No Description CT No C%&ss !+r*en Ukp Rct Re%&2$A/A' $VA' $V' $Oh '

1. CT-F1& CO "-1 % -4 1A + P 2 1+ - 2 5PA5 34

2. CT-F1 CO "-2 % -4 1A G - 4 2 5olkar

3. 33kV Cable Feeder -,eterin CT-F1 CO "-3 % -4 1A .+ 5 1 - 2 -

4. CT-F1 CO "-4 12 1A + P 2 1 - % A & "

+. CT-T1-1 CO "-1 12 1 A + P 2 1 - % A & "

%. CT-T1-1 CO "-2 % -3 1 A .+ 5 1 - 1.+ -

7.% -3 1 A

G1 4 1.+

A &

1 -* 1 A 1 4 4

*. CT-T1-1&CO "-4 % -3 1A + P 2 1 - 1.+ 5PA; 14

. CT-T1-' CO "-1 1 -* 1A G 1 4 4 5PA; 11+

1 . CT-T1-' CO "-2 1 -* 1A + P 2 1 - 4 A & "; +

11. 12 1A + P 2 1 - % A &

R&tio

33kV Cable Feeder -DirectionalO er Current ! "art# Fault

Protection $%7&%7'(

33kV Cable Feeder -Pilot )ireProtection- $*+(

33kV u/ ar DifferentialProtection 0ine Feeder $*7 (

33kV u/ ar DifferentialProtection Tran/former Feeder

$*7 (33kV Tran/former Feeder

-,eterin

33 11kV Tran/former DifferentialProtection Calculation $*7T(

CT-T1-1 CO "-3 CT-T1-2 CO "-1

33kV Tran/former Feeder-Directional O er CurrentProtection $+1-+1'(

33 11kV Tran/former Feeder- e/tricted "art# Fault Protection-

$%4 (

33 11kV Tran/former Feeder-5tand 6 "art# Fault Protection

$5 "F(

33kV u/ ar DifferentialProtection - u/ 5ection Feeder

$*7 (

CT- C1-1 CO "-3 CT-C1-2 CO "-1


41/43


Re"ision A D&te - 7

S No Description CT No C%&ss !+r*en Ukp Rct Re%&2$A/A' $VA' $V' $Oh 'R&tio

12. CT- C1-1 CO "-2 12 1A .+ 5 1 - % -

13. CT- C1-1 CO "-1 12 1A + P 2 1 - % 5PA; 14

14. CT-T1-2& CO "-4 1 -* 1A + P 2 1 - 4 5PA; 14

1+. CT-T1-2& CO "-3 1 -* 1A .+ 5 1 - 4 -

1%. CT-2& 4 CO "-1 % -3 1A + P 2 1 - 1.+ "F +42

17. CT-2& 4 CO "-2 % -3 1A .+ 5 1 - 1.+ -

1*. CT-3 CO "-1 3 1A + P 2 1 - "F +42 Pl

1 . CT-3 CO "-2 3 1A .+ 5 1 - -

2 . CT-1 CO "-1 1% 1A + P 2 1 - * "F +42 P

33kV u/ 5ection Feeder -,eterin

33kV u/ 5ection Feeder -Directional O ercurrent Protection

$+1-+1'(

11kV Tran/former Feeder-Directional O er Current

Protection $+1-+1'(

11kV Tran/former Feeder-,eterin

11kV Cable Ca acitor ankFeeder -Directional O er Current

Protection $+1-+1'(

11kV Cable Ca acitor ankFeeder - ,eterin

11kV Au@. Tran/former Feeder-O er Current Protection

11kV Au@. Tran/former Feeder-,eterin

11kV u/ 5ection Feeder- O erCurrent Protection


42/43


Re"ision A D&te - 7

S No Description CT No C%&ss !+r*en Ukp Rct Re%&2$A/A' $VA' $V' $Oh 'R&tio

21. CT-1 CO "-2 1% 1A .+ 5 1 - * -

S No VT D&t& VT No R&tio !+r*en Se%ecte* C%&ss$V/V' $VA' $VA'

1. 33kV 08'" VT - ,"T" 8'9 PT-F1& CO "-1 33/3 / 110/3 1 . 7 1 Cl


43/43

RE)ERENCESCT / VT PARAMETER CALCULATION

S No Description

a.

b. 5PA5 34*C ela6 Catalo ue for ela6 urden 8nformation

c. "; +27 ela6 Catalo ue for ela6 urden 8nformation

d. 5olkar f ela6 Catalo ue for Current Tran/former e uirement

e. Circuitor CV>m ,ultifunction ,eter Catalo ue

f. C"05A C 8 Ammeter Tran/ducer

e. " + ela6 Catalo ue for urden 8nformation

. A / e uirement on Current Tran/former/ for " +

#. "T 31%J4 ela6 Catalo ue for urden 8nformation

8. A / e uirement on Current Tran/former/ for "T 31% "T 31%J4

L. 5PA; 14 C ela6 Catalo ue for urden 8nformation

k. 5PA; 11+ C ela6 Catalo ue

l. A / e uirement on Current Tran/former/ for 5PA; 11+C

m. "; +21 ela6 Catalo ue for urden 8nformation

n. "F +42 Plu/ ela6 Catalo ue for urden 8nformation

LARSEN TOU!RO LIMITEDECC Di"ision # EDRC $E%ectric&%'

A / A lication uide to O ercurrent ,odule/ and function/ of 5PACO, and"M 5erie/

ct vt calculation al ain rev.2

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