ct vt calculation al ain rev.3(latest)

7/24/2019 CT VT Calculation Al AIN Rev.3(Latest)

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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 Oer 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 3311kV Tran/former Differential Protection Calculation $*7T( 13 TO 1%

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

3311kV Tran/former Feeder -e/tricted "art# Fault Protection- $%4( 1 TO 21

1 3311kV Tran/former Feeder -5tand 6 "art# Fault Protection $5"F( 22 TO 23

11 11kV CableCaacitor ank Feeder -Directional Oer Current Protection $+1-+1'( 24 TO 2+

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

. VT Parameter Calculation 2* TO 3+

1 33kV 0ine VT - ,eterin 2* TO 2

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

3 33kV u/ VT 32 TO 33

4 11kV u/ VT 34 TO 3+

C. 5ummar6 5#eet 3% TO 3*

D. 0i/t of cataloue eference/ 3 TO 3

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


3/43

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LARSEN & TOUBRO LIMITED

ECC Division - EDRC (Electrical)

PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C %-41A

ated 5econdar6 Current 8/n > 1 A

CT Cla// > + P 2

5econdar6 )indin e/i/tance ct > 2 O#m/ at 4 A ta

5elected Ta > 4 A

10 Ass+ptions :

T#e ,a?.3P#.5.C Current of 33kV u/ > 31.5 kA

13 Re%&2s Propose*

a ,ake > A

b Directional Oer Current ela6 > 5PA5 34* C

c Directional "art# Fault ela6 > "9 +27

d ated ela6 /econdar6 current 8r > 1 A

1 C&%c+%&tion o4 Le&* !+r*en RLCable con/idered for CT connection > 4 /@.mm Cu

AC e/i/tance of t#e cable 7de C > +.+2 O#m/km

0ent# betBeen CT and t#e ela6 > 3 ,tr/

5inle 0ead e/i/tance from CT to > .3 ? +.+2

ela6 0 > .1%% O#m/

20 > .33 O#m/

VA urden of t#e 0ead > $1?1( ? .33 VA

> .33 VA

15 !+r*en o4 Re%&2

Directional Oer Current ela6 $5PA5 34* C( > 1 mo#m

Directional "art# Fault ela6 $"9 +27( > 1 mo#m

VA urden of Oer Current ela6 $5PA5 34* C( > $1?1( ? 1. 1

> .1 VA

VA urden of Oer Current ela6 $"9 +27( > $1?1( ? 1. 1

> .1 VA

23.4.24


4/43

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PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 4 A

n ?

n > CT rated Accurac6 0imit Factor > 2

> ated CT PoBer > 1+ VA C#o/en Value

> > 2 )att/

> urden at ated Current > .+3

n > 2 ? $1+. E 2.( $.+3 E 2.(

> 134

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

16 Conc%+sion

CT atio 5elected > ,77#77/1A

5elected Ta > 77 A

CT 5econdar6 e/i/tance > 0 Ohsated VA of t#e CT core 5elected for Directional> 15 VA

Accurac6 Cla// > 5 P 07

ated Continuou/ T#ermal Current > 157 8

ated 5#ort Time T#ermal Current > 315 kA 4or 1 Sec

$P'E P

"(

$PE P

"(

P'

P"

CT 8nternal 0o//e/ 8n2? ct

P


5/43

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PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C ated current of 5O0=A f ela6

8f > Primar6 current under ma?imum /tead6

/tate t#rou# fault condition/

' > Current Tran/former atioct > CT 5econdar6 )indin e/i/tance

0 > 5inle 0ead e/i/tance from CT to ela6

Vk > +1 E 31+ 4 ? $2 E 2?.1%%(

234 V

0, Conc%+sion


5elected Ta > 77 A

CT 5econdar6 e/i/tance > 0 Ohs

Cla// of Accurac6 > X

=nee Point Voltae 5elected > 77 V

,aneti/in Current at Vk2 G> 37 A



6/43

% of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 315 kA 4or 1 Sec


7/43

7 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C CT-F1 CO"-3

ated Primar6 Current 8n > %-41A


CT Cla// > .+ 5

5econdar6 )indin e/i/tance ct > 2 O#m/ at 4 A ta

5elected Ta > 4 A

30 Ass+ptions :


33 C&%c+%&tion o4 Le&* !+r*en RL

Cable con/idered for CT connection > 4 /@.mm Cu




ela6 0 > .1%% O#m/

20 > .33 O#m/VA urden of t#e 0ead > $1?1( ? .33 VA

> .33 VA

3 !+r*en Det&i%s

5.'o. Deice urden ,ake

a. a6 Control Hnit .1 A& "F +42

b. ,ultifunction ,eter .% C8CHTO& CV,=

c. Ammeter Tran/ducer 2.2 C"05A& C8

d. 0ead urden .33

Tot&% !+r*en 3.23

35 Conc%+sion


5elected Ta > 77 A


ated VA of t#e CT core 5elected for ,eterin > 17 VA

Accurac6 Cla// > 75 S

8n/trument 5ecurit6 Factor G> 5 &t &%% T&ps




8/43

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PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


9/43

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PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


10/43

1 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 12m/& or

for 12m/G>T'G> 3m/

8kma?

81'

T'

$P'E P

"(

$PE P

"(

P'

P"


P


11/43

11 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


12/43

12 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


13/43

13 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C CT-T1-1 CO"-2

ated Primar6 Current 8n > %-31 A


CT Cla// > .+ 5

5econdar6 )indin e/i/tance ct > 1.+ O#m/ at 3 A ta

5elected Ta > 3 A

,0 Ass+ptions :

T#e ,a?.3P#.5.C Current of 33kV u/ > 31.+ kA

Tran/former ,VA atin > 1+ ,VA

Tran/former kV atin > 33 11.++ kV

0oad Current on 33kV 5ide > 2%2.4 A

0oad Current on 11.++kV 5ide > 74.* A

,3 C&%c+%&tion o4 Le&* !+r*en RL


AC e/i/tance of t#e cable 7de C > +.+2 O#m/km0ent# betBeen CT and t#e ela6 > 3 ,tr/


ela6 0 > .1%% O#m/

20 > .33 O#m/


> .33 VA

, !+r*en Det&i%s


a. a6 Control Hnit .1 A& "F +42

b. ,ultifunction ,eter .% C8CHTO& CV,=c. Ammeter Tran/ducer 2.2 C"05A& C8

d. 0ead urden .33

Tot&% !+r*en 3.23

,5 Conc%+sion

CT atio 5elected > ,77#377/1 A

5elected Ta > 377 A



Accurac6 Cla// > 75 S

8n/trument 5ecurit6 Factor G> 5 &t &%% T&ps



14/43

14 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 315 kA 4or 1 Sec


15/43

1+ of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


16/43

1% of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


17/43

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PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 33 11.++ kV

,VA atin of t#e Tran/former > 1+ ,VA

Per Hnit 8medance > 1 I

8medance of t#e Tran/former on 33 kV 5ide > .1?$33 ? 33( 1+

> 7.2% o#m/

8medance of t#e Tran/former on 11.++ kV 5ide > .1?$11.++ ? 11.++( 1+

> .* o#m/

T#u/ t#rou# fault current on 33kV 5ide > 33 /@rt$3( $.%E7.2%(

> 2.42 kA

T#u/ t#rou# fault current on 11.++kV 5ide > 11.++ /@rt$3( $.21E.*(

> %.% kA

-, C+rrent Tr&ns4orer Re n ?

)#ere

n > "ffectie accurac6 limit Factor

> Nominal current Related to Protected Obect !

1+ /@rt$3( 33 > 2%2 A

> Nominal current of "# ! 3

n > CT rated Accurac6 0imit Factor > 43 $Calculated eloB(

> ated CT PoBer > 1 VA $5elected Value(

> > 2 )att/

> urden at ated Current > .43

> ,a?imum Primar6 t#rou# fault current> 2.42 kA

For a cla// Current Tran/former& e@uialent alue of CT rated accurac6 cla// factor $n(

n > Hk ? 8n/ec ? 1.3

)#ere

Hk > CT =nee oint Voltae > 4 V $5elected Value(

n > CT rated Accurac6 0imit Factor > 43.3 $Calculated eloB(

n > $4 ? 1?1.3( $1 E 2(

> 43

43 ? $1 E 2( ? 3

$.43 E 2( ? 2%2

n > 24+

For t#e /6/tem under con/ideration > 8kma?8n

8kma? > 2422 2%2> .23

$P'E P

"(? 8

' of CT

$PE P

"(?8

'

8'

8' of CT

P'

P"


P

8kma?

P'E P

"


18/43

1* of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C $from A/ ela6 Cataloue(

$Fiure-1 Pae 33(

n > 24+ & /o t#e current tran/former /ati/fie/ t#e re@uirement.

& 11kV Si*e

A/ er ela6 manufacturer/ Cataloue

n G> n ?

)#eren > "ffectie accurac6 limit Factor

> Nominal current Related to Protected Obect !

1+ /@rt$3( 11.++ > 7+ A

> Nominal current of "# ! *

n > CT rated Accurac6 0imit Factor > 37 $Calculated eloB(


> > 4 )att/


> ,a?imum Primar6 t#rou# fault current> %.% kA

For a cla// Current Tran/former& e@uialent alue of CT rated accurac6 cla// factor $n(

n > Hk ? 8n/ec ? 1.3

)#ere

Hk > CT =nee oint Voltae > 4 V $5elected Value(

n > CT rated Accurac6 0imit Factor > 37.1 $Calculated eloB(

n > $4 ? 1?1.3( $1 E 4(

> 37

37 ? $1 E 4( ? *

$.43 E 4( ? 7+

n > 12+

For t#e /6/tem under con/ideration > 8kma?8n

> %+% 7+

> *.*

For 8kma?8n calculated aboe n > *.+ $from A/ ela6 Cataloue(

)#ere $Fiure-1 Pae 33(

8kma? > 125 *.+ & /o t#e current tran/former /ati/fie/ t#e re@uirement.

$P'E P

"(? 8

' of CT

$PE P

"(?8

'

8'

8' of CT

P'

P"


P

8kma?

P'E P

"


19/43

1 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C ,77#377/1 A

CT atio 5elected for 11kV 5ide > 1777#677/1 A

ated VA of t#e CT on 33kV 5ide > 17 VA

ated VA of t#e CT on 11kV 5ide > 17 VA

5elected Ta on 33kV 5ide > 377 A

5elected Ta on 11kV 5ide > 677 A

CT 5econdar6 e/i/tance on 33kV /ide > 0 Ohs

CT 5econdar6 e/i/tance on 11kV /ide > Ohs

Accurac6 Cla// > X

8 maneti/in > 37 A B Vk/0

=nee oint Voltae on 33kV 5ide > 77

=nee oint Voltae on 11kV 5ide > 77




20/43

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PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C %-31A


CT Cla// > + P 2


5elected Ta > 3 A

60 Ass+ptions :






63 Re%&2s Propose*

a ,ake > A

b Directional Oer Current and "art# fault ela6 > 5PA9 14Cc ated ela6 /econdar6 current 8r > 1 A






ela6 0 > .17 O#m/

20 > .33 O#m/


> .33 VA

65 !+r*en Det&i%s5.'o. Deice urden ,ake

a. Directional Oer Current ela6 .1 5PA9 14C

c. 0ead urden .33

Tot&% !+r*en .43

6, Acc+r&c2 Liit )&ctor o4 the CT

A/ e@uirement n > 8kma?8n

> 31+ 3

1+

23.4.24


21/43

21 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C n ?

)#ere



> > 1.+ )att/


n > 2 ? $1 E 1.+( $.43 E 1.+(

> 11

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

6- Conc%+sion


5elected Ta > 377 A

CT 5econdar6 e/i/tance > 15 Ohsated VA of t#e CT core > 17 VA




$P'E P

"(

$PE P

"(

P'

P"


P


22/43

22 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 5PA9 11+C


C&%c+%&tion o4 Le&* !+r*en RLCable con/idered for CT connection > 4 /@.mm Cu




ela6 0 > .17 O#m/

20 > .33 O#m/

5 Thro+;h 4&+%t c+rrent c&%c+%&tion

=V atin of t#e Tran/former > 33 11.++ kV

,VA ratin of t#e tran/former > 1+ ,VA

Tran/former Per unit imedance > 1 .u

5#ort Circuit ,VA > 1+ .1> 1+ ,VA

1+ $/@rt$3( ? 11.++(

t#e /econdar6 /ide > 74*.% A

8kma? > 7.+ kA

, :nee point "o%t&;e c&%c+%&tion

T#e =nee Point Voltae Vk > 2 H/

)#ere H/ i/ t#e Voltae /ettin of t#e ela6

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

23.4.24


23/43

23 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C ,a?imum t#rou# fault current for B#ic# rela6

mu/t not oerate

n > Current Tran/former turn/ ratio

ct > 5econdar6 e/itance $ O#m/(

0 > Total re/i/tance of t#e lone/t mea/urin circuit

H/ > 74*.1 *$7 E .33(

H/ > %*.7

5et alue of H/ > 7+

2H/

> 2 ? 7+> 1+

=nee oint Voltae /elected Hk > 1+aro?.

Adoted Value of Hk > 4 V

- Sensiti"it2 Check

T#e Primar6 oeratin Current 8o > n ? $ 8r E m J 8e E 8u(

n > CT tran/formation ratio

> 677

8r > ela6 Oeratin Current > mJ8e> 5 A

8e > Current Tran/former ,a. Current at

/ettin oltae

> $3?7+( $42(

> 1105 A

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

> Nos

8u > Current t#rou# ari/tor at H/

> 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*"(

677 $ 775 ? @7711 ? 7717'> *

6 V&%+e o4 st&(i%isin; Resistor $Rs'

,a?imum Po//ible alue of H/ > 7+ V,inimum alue of /tart Current 8r > 4+ mA $8t i/ m ? 8e a/ recommended in

t#e cataloue for 5PA9 11+C(

Value of /tabili/in e/i/tor $/( > H/8r> 1%%%.7 O#m/ T6e - $+24* *31-C(


24/43

24 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C .1 O#m/5ince t#e inut imedance of t#e rela6 i/ neliible in comari/on to t#e alue of /tabili/in re/i/tor&

t#e /ame i/ not /ub/tracted from t#e calculated alue of / aboe.

Conc%+sion

CT atio 5elected > 1777#677/1A

5elected Ta > 677 A

CT 5econdar6 e/i/tance > - Ohs

ated VA of t#e CT core 5elected for e/tricted> 17 VA

"art# fault rotection

,inimum =nee oint Voltae e@uirement > 77 V

Accurac6 Cla// > X

8 maneti/in > 37 A B Vk/0




25/43

2+ of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


26/43

2% of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C urden at ated Current > .43P


27/43

27 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 2 ? $1+. E 4.( $.43 E 4.(

> *%

n > *% 3 & /o t#e current tran/former /ati/fie/ t#e re@uirement.

17, Conc%+sion


5elected Ta > 677 A

CT 5econdar6 e/i/tance > Ohs






28/43

2* of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C %-31A


CT Cla// > + P 2


5elected Ta > 3 A

110 Ass+ptions :

T#e ,a?.3P#.5.C Current of 33kV u/ > 31.5 kA 33 kV

113 Re%&2s Propose*

a ,ake > A

b Directional Oer Current ela6 > "F +42 Plu/

c Directional "art# Fault ela6 > "F +42 Plu/


11 C&%c+%&tion o4 Le&* !+r*en RLCable con/idered for CT connection > 4 /@.mm Cu




ela6 0 > .17 O#m/

20 > .33 O#m/


> .33 VA

115 !+r*en Det&i%s


a. Directional Oer Current ela6 .1 "F +42 Plu/

c. 0ead urden .33Tot&% !+r*en .43


A/ e@uirement > 8kma?8n

> 31+ 3

1+

23.4.24


29/43

2 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C n ?

)#ere



> > 1.+ )att/


n > 2 ? $1. E 1.+( $.43 E 1.+(

> 11

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

11- Conc%+sion


5elected Ta > 377 A

CT 5econdar6 e/i/tance > 15 Ohsated VA of t#e CT core 5elected for Directional> 17 VA

Oercurrent "art# fault rotection



$P'E P

"(

$PE P

"(

P'

P"


P


30/43

3 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 1-*1A


CT Cla// > + P 2

5econdar6 )indin e/i/tance ct > 4 O#m/ at * A ta

5elected Ta > * A

100 Ass+ptions :

T#e ,a?.3P#.5.C Current of 33kV u/ > 31.5 kA 33 kV





103 Re%&2s Propose*

a ,ake > A

b Directional Oer Current and "art# fault ela6 > 5PA9 14Cc ated ela6 /econdar6 current 8r > 1 A






ela6 0 > .% O#m/

20 > .11 O#m/


> .11 VA

105 !+r*en Det&i%s5.'o. Deice urden ,ake

a. Directional Oer Current ela6 .1 5PA9 14C

c. 0ead urden .11

Tot&% !+r*en .21


A/ e@uirement > 8kma?8n

> 31+ *

3

23.4.24


31/43

31 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C n ?

)#ere



> > 4 )att/


n > 2 ? $1 E 4.( $.21 E 4.(

> %7

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

10- Conc%+sion


5elected Ta > 677 A

CT 5econdar6 e/i/tance > Ohsated VA of t#e CT core 5elected for Directional> 17 VA

Oercurrent "art# fault rotection




$P'E P

"(

$PE P

"(

P'

P"


P


32/43

32 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C PT-F1& CO"-1

Voltae atin > 33/3 / 110/3

VA atin > 100 VA

Core-1 > Cl :1

10 VT !+r*en C&%c+%&tion

!+r*en on Core#1

Voltae atin of t#e VT > 11 V

VA atin of t#e VT > 1 VA

Current 5ulied b6 VT at ma?imum VA atin > $1 ? /@rt$3( ( $11(

1.+7+ A

$a( 0ead urden on Core-1

Cable

From To

1 VT 56nc#roni/in Circuit 4C ? 2.+ *.*7 2 ? 3 1.32

Cu. Conductor %

$b( Ot#er urden/ on Core-1

5.'o. Deice urden $VA( ,ake T6e

1 T&rri4 Meterin;

'ot Alicable

0 !&ck+p Meterin;

Voltmeter + - -

3 Protection Re%&2s'ot Alicable

S2nchronis&tion

a. C#eck 56nc#roni/ation ela6 .2+ A 5PAH14 C

b. 56nc#ro/coe % A

c. Double Fre@uenc6 ,eter 1.2 A

d. Double Volt ,eter + A

e. 'o Voltae ela6 1.2 A

5 Le&* !+r*en

a. 0ead urden under 5.'o-1 aboe 1.32

Tot&% !+r*en 1-

8VT

5.'o

Cable 5iKein [email protected](

Cablee/i/tance

$( in$O#m/km(

2 )a6Cable0ent#

$0( in $m(

Total 0ead0o// $VA(>$8

VT2??01(


33/43

33 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


34/43

34 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C PT-F1& CO"-2

Voltae atin > 33/3 / 110/3

VA atin > 50 VA

Core-2 > Cl :3P


!+r*en on Core#0

Voltae atin of T#e VT > 11 V

VA atin of t#e VT > + VA

Current 5ulied b6 VT at ma?imum VA atin > $+ ? /@rt$3( ( $11(

.7*7 A


Cable

From To

1 VT 5PA5 34*C ela6 4C ? 2.+ *.*7 2 ? 3 .33

Cu. Conductor %



1 T&rri4 Meterin;

'ot Alicable

0 !&ck+p Meterin;

'ot Alicable

3 Protection Re%&2s/irectional O2" and art- )ault Relay .+ A 5PA5 34* C

S2nchronis&tion

'ot Alicable

5 Le&* !+r*en

a. 0ead urden under 5.'o-1 aboe .33

Tot&% !+r*en 763

8VT

5.'o


Cablee/i/tance

$( in$O#m/km(

2 )a6Cable0ent#

$0( in $m(


VT2??01(


35/43

3+ of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


36/43

3% of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C PT-H5-1& CO"-1

Voltae atin > 33/3 / 110/3

VA atin > 100 VA

Core-1 > Cl :1


!+r*en on Core#1




1.+7+ A


Cable

From To


Cu. Conductor %



1 T&rri4 Meterin;

'ot Alicable

0 !&ck+p Meterin;

'ot Alicable

3 Protection Re%&2s'ot Alicable

S2nchronis&tion


b. 56nc#ro/coe % A




5 Le&* !+r*en


Tot&% !+r*en 1-

8VT

5.'o


Cablee/i/tance

$( in$O#m/km(

2 )a6Cable0ent#

$0( in $m(


VT2??01(


37/43

37 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


38/43

3* of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C 11/3 / 110/3

VA atin > 100 VA

Core-1 > Cl :1


!+r*en on Core#1




1.+7+ A


Cable

From To


Cu. Conductor %



1 T&rri4 Meterin;

'ot Alicable

0 !&ck+p Meterin;

'ot Alicable

3 Protection Re%&2s

Voltmeter + - - S2nchronis&tion


b. 56nc#ro/coe % A




5 Le&* !+r*en


Tot&% !+r*en 1-

8VT

5.'o


Cablee/i/tance

$( in$O#m/km(

2 )a6Cable0ent#

$0( in $m(


VT2??01(


39/43

3 of 43



PO9"CT : 3311kV 55 8' A0 A8' A"A ef : ;14--074493+3 A

P"P C


40/43



Re"ision A D&te 03

SNo Description CT No C%&ss !+r*en Ukp Rct Re%&2

$A/A' $VA' $V' $Oh'

1. CT-F1& CO"-1 %-41A + P 2 1+ - 2 5PA

2. CT-F1 CO"-2 %-41A - 4 2 5o

3. 33kV Cable Feeder -,eterin CT-F1 CO"-3 %-41A .+ 5 1 - 2

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

+. CT-T1-1 CO"-1 121 A + P 2 1 - % A&

%. CT-T1-1 CO"-2 %-31 A .+ 5 1 - 1.+

7.

%-31 A

1 4 2

A&

1-*1 A 1 4 4

*. CT-T1-1&CO"-4 %-31A + P 2 1 - 1.+ 5PA

. CT-T1-' CO"-1 1-*1A 1 4 7 5PA

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

11. 121A + P 2 1 - % A&

R&tio

33kV Cable Feeder -DirectionalOer 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

3311kV Tran/former DifferentialProtection Calculation $*7T(

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

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

3311kV Tran/former Feeder-e/tricted "art# Fault Protection-

$%4(

3311kV 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 03


$A/A' $VA' $V' $Oh'

R&tio

12. CT-C1-1 CO"-2 121A .+ 5 1 - 4.+

13. CT-C1-1 CO"-1 121A + P 2 1 - % 5PA

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

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

1%. CT-2& 4 CO"-1 %-31A + P 2 1 - 1.+ "F +

17. CT-2& 4 CO"-2 %-31A .+ 5 1 - 1.+

1*. CT-3 CO"-1 31A + P 2 % - "F +

1. CT-3 CO"-2 31A .+ 5 7.+ -

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

33kV u/ 5ection Feeder -,eterin

33kV u/ 5ection Feeder -Directional Oercurrent Protection

$+1-+1'(

11kV Tran/former Feeder-Directional Oer Current

Protection $+1-+1'(

11kV Tran/former Feeder-,eterin

11kV CableCaacitor ankFeeder -Directional Oer Current

Protection $+1-+1'(

11kV CableCaacitor ankFeeder - ,eterin

11kV Au?. Tran/former Feeder-Oer Current Protection

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

11kV u/ 5ection Feeder- OerCurrent Protection


42/43



Re"ision A D&te 037


$A/A' $VA' $V' $Oh'

R&tio

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

SNo VT D&t& VT No R&tio !+r*en Se%ecte* C%&ss

$V/V' $VA' $VA'

1. 33kV 0ine VT - ,eterin PT-F1& CO"-1 33/3 / 110/3 1.7 1 Cl :1

2. 33kV 08'" VT- POT"CT8O' PT-F1& CO"-2 33/3 / 110/3 .*3 + Cl :3P

3. 33kV u/ VT PT-H5-1& CO"-1 33/3 / 110/3 14.7 1 Cl :1

4. 11kV u/ VT Core-1 11/3 / 110/3 1.7 1 Cl :1

Technic&% D&t& 33kV Si*e Technic&% D&t& 11kV Si*e

1. ated Voltae 3% kV ated Voltae 12 kV

2. 5erice Voltae 33 kV 5erice Voltae 11 kV

3. Fre@uenc6 +


43/43

RE)ERENCES

CT / VT PARAMETER CALCULATION

SNo Description

a.

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

c. "9 +27 ela6 Cataloue for ela6 urden 8nformation

d. 5olkar f ela6 Cataloue for Current Tran/former e@uirement

e. Circuitor CV=m ,ultifunction ,eter Cataloue

f. C"05A C8 Ammeter Tran/ducer

e. " + ela6 Cataloue for urden 8nformation

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

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

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

L. 5PA9 14 C ela6 Cataloue for urden 8nformation

k. 5PA9 11+ C ela6 Cataloue

l. A/ e@uirement on Current Tran/former/ for 5PA9 11+C

m. "9 +21 ela6 Cataloue for urden 8nformation

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

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

A/ Alication uide to Oercurrent ,odule/ and function/ of 5PACO, and"M 5erie/

ct vt calculation al ain rev.3(latest)

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