184306471-CT-Sizing

DOC. NO. CU-47000-0202 REV. 0

PROJECT: PROJE CT: 765k V UNNAO SUBSTATION SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235

A.1

CT sizi sizing ng calc calcul ulat atio ion n for for 400k 400kV V Exi Exist stin ing g Bus Bus-B -Bar ar Prot Protec ecti tion on

A.1. .1.1

Appli pplic cable able CT an an core core !u" !u"ber bers#

A.1.$

A.1.%

A.1.4 .1.4

$##%#& D#'!()

CT R!'(*

CT N*

C*&#

R#+. D&!,(" N*.

400kV

2000

400-6-CT 400-7-CT



765400kV U!* 1/1'!'(* SLD:CU-47000000@R#<.00

+'ste" Para"eter =A1 #& S#(+(!'(*@V*)-II G##&!) T#(!) T#(!) R#(&##' 0706-47ES-0200 R#<.0 R#<.0 C).6.? V!&(!/)#

V!)#

U('

V

420

kV

I1#

40

kA

'



1

+ 

50

89

;R

30

-

D#1&('(* N*(!) V*)'!"# P&(!& S*&' C(&(' C&&#' M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#

CT Para"eter =A1 #& S#(+(!'(* @V*)-III I1'&#' T&!1+*&#& 0706-47ES-7230 R#<.0.C).2. R#<.0.C).2..2? .2? IPN

2000

A

ISN



A

R!'#% S#*%!& C&&#'

RCT

5

Ω

CT R#1(1'!# !' 75 *C

R!'#% P&(!& C&&#'

&ela &ela' ' Par Para" a"et eter er (A (As per per t)e t)e atta attac) c)e e Annex nnexur ure e 1* IR



A

S&

0

VA

M!( P&*'#'(<# &#)! B&%#=B&%# > CT &#(&##' *+ RADSS &#)!1?

'

5

1

B1/!& P&*'#'(* R#)! O#&!'(" '(#=A1 #& A#&#-I?

'CB

40

1

C(&(' B&#!k#& O#&!'(" '(#=A1 #& A#&#-I?

R!'#% I' C&&#' *+ R#)! 1#%

P!"# 

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235 A.1.,

+econar' e ea Pa Para"eter IL

00



AL

6

2



-

3.746

Ω/k

& L

A.1.

S(")# ,! )#"' *+ )#!%1 C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75*C

/etails of of &e &ela' Propose



R#)! T#

:

2

R!'#% C&&#'@IR

B1 D(++&#'(!) P&*'#'(* =ABB-RADSS?

: A

3

S*&' '(# &&#' !&&(" !!('@I !!('@I' =&#)!?

:

00 ; IR +*& 1

 00 ;  A +*& 1 1  00A

4

M!( &#)! (' &&#' %&(" '&*" +!)'@ I+



+*& 1#

IPSCIPN ; ISN  400002000 ;   20.0 20.00A 0A

A.1. .1.

00A I'=&#)!?F

or" or"u ula an an &e2 &e2u uire" ire"en entts-3e s-3ete terring ing T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&ate +'""etrical +)ort Circuit Current factor(6ssc* SSC

A1 #& IEC 44-6=C).3.5?  IPSCIPN  40 ; 0002 0002000 000  20. 20.00

+tanar Value of 6++C

2

 $0 $0

As per 5EC 44-(Cl.4.1*

Pri"ar' Ti"e Constant(TP* $*& '# S1'# C)*1# ( $!)'

;R 30 30 LR 30=2;3. 30=2;3.4;50? 4;50?

T#&#+*&# P&(!& T(# C*1'!'=T P? !' 11'# +!)'



0.061#

P!"# 2

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235 A.1.,

+econar' e ea Pa Para"eter IL

00



AL

6

2



-

3.746

Ω/k

& L

A.1.

S(")# ,! )#"' *+ )#!%1 C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75*C

/etails of of &e &ela' Propose



R#)! T#

:

2

R!'#% C&&#'@IR

B1 D(++&#'(!) P&*'#'(* =ABB-RADSS?

: A

3

S*&' '(# &&#' !&&(" !!('@I !!('@I' =&#)!?

:

00 ; IR +*& 1

 00 ;  A +*& 1 1  00A

4

M!( &#)! (' &&#' %&(" '&*" +!)'@ I+



+*& 1#

IPSCIPN ; ISN  400002000 ;   20.0 20.00A 0A

A.1. .1.

00A I'=&#)!?F

or" or"u ula an an &e2 &e2u uire" ire"en entts-3e s-3ete terring ing T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&ate +'""etrical +)ort Circuit Current factor(6ssc* SSC

A1 #& IEC 44-6=C).3.5?  IPSCIPN  40 ; 0002 0002000 000  20. 20.00


2

 $0 $0

As per 5EC 44-(Cl.4.1*

Pri"ar' Ti"e Constant(TP* $*& '# S1'# C)*1# ( $!)'

;R 30 30 LR 30=2;3. 30=2;3.4;50? 4;50?

T#&#+*&# P&(!& T(# C*1'!'=T P? !' 11'# +!)'



0.061#

P!"# 2

DOC. NO. CU-47000-0202 REV. 0

PROJECT: PROJE CT: 765kV 765 kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235

 5.54 5.541# 1# +tanar Value of T P

3

 1$ 1 $0

As per 5EC 44-(Cl.4.%*

/ut' C'cle(C-7* +ingle Energisation

 C-'H C-'H-O -O

,#&# 'H  D&!'(* *+ +(&1' &&#' +)*, 'H ''CB  551 +ele +elect cte e /ut' /ut' C'cl C'cle e

4



S! 0 S#

C-80 C-80"s "s-7 -7

&esisti9e Buren(External Buren* &5  ($ .5.5.r  :1000*

T,* ,! )#!% (1'!#

= IL00 M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'?  =2;00;3. =2;00;3.746 746000? 000? 

&r  +r:5r $

R#)! /&%# * CT

 0 02 2 

R/  RIR RIR& &  10.75Ω

P!"# 3

C*1(%#&#% (+*& +*& CT

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235

+tanar Value of &b

5



Vk; 0., x 5f x (& CT>&5*

6nee Point Voltage

K 0.520=50.75? K ,.4< V



&ate E2ui9alent &ate +econar' e.".f

Eal

 11  '%  =RCT  R/?  ISN

=-'HTP? ? 6t  6tf  2  (  +  TP  =  - #

2  3.4  50  =0.2?  =-#=-0.00.2??  

6t  6tf  1<.%%4

Eal

 11 ; '% ; =R'  R/? ; I1

Eal

 8%.% V

20  .0 =5  2.75?  

As E2ui9alent &ate +econar' e.".f is greater t)an 6nee Point Voltage= CT is capable of suppl'ing Eal to t)e rela' circuit.

A.1.8

&esults ' ! ' # & & 0 C 5 & ! 4 ( & ? P N P % I # = ' ! 3 ! R T

5 & ! % * ? 2 N S # I = ' S % # & # ' & ! 0 R C

=A?

=A?

2000



' ( 0 2 & ( C ' & * 6 & S * ) ' ! 2 2 ! ( & $ ' # ' 4 # & 4 & 5 0 S C

' ! ' 1 * C # 4 ( T 5 & ! 4 ( & P

? 6 ' I # = ' 4 ( T # & & ' & 0 * 6 C ) S ! % 4 # & ' # ! 6 R T

# ? 4 ( 6 T ' I ' ' & = * 6 # & S & + 0 * C - ) * ! ( ' 4 & ! & # 0 6 D T

=89?

=kA?

=1#?

=kA?

=-?

=-?

=1?

=-?

50

40kA



00

TP;

20

20

C-01-O

? + = 5 2 # 0 : # & $ % # ' ! R

2 ( ? 4 ! 5 - % 5 I = ' D % # # & & ' ! 0 R C

P!"# 4

C E I & # 3 1 ! 1 1 ! ) C

# ) 2 5 C 5 ' 0 % % # ( + ( 2 # 3 S

# % & 0 B # < ( ' 1 ( 1 # R

+ . 4 . # . 2 # S " ( ' ( 4 ( L . ( 0 : E

=Ω?

=V?

12.8Ω

664V

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING

DOC. NO. CU-47000-0202 REV. 0

B.1

CT sizing calculation for 400kV Transfor"er /ifferential Protection(8TA*-o? 5"peace Protection

B.1.1

Applicable CT an core !u"bers# $##%#& D#'!()

B.1.$

B.1.%

B.1.4

B.1.,

CT R!'(*

CT N*

C*&# N*.

ICT-

600

400-6-CTT

2

ICT-2

600

400-7-CTT

2

R#+. D&!,(" N*. 765400kV U!* 1/1'!'(* SLD:CU-47000-000@R#<.00

+'ste" Para"eter =A1 #& S#(+(!'(*@V*)-II G##&!) T#(!) R#(&##' 0706-47ES-0200 R#<.0 C).6.? V!&(!/)#

V!)#

U('

V

420

kV

I1#

40

kA

'



1

+ 

50

89

;R

30

-

D#1&('(* N*(!) V*)'!"# P&(!& S*&' C(&(' C&&#' M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#

CT Para"eter =A1 #& S#(+(!'(* @V*)-III I1'&#' T&!1+*&#& 0706-47ES-7230 R#<.0.C).2..2? IPN

600

A

ISN



A

R!'#% S#*%!& C&&#'

RCT

5

Ω

CT R#1(1'!# !' 75 *C

R!'#% I' C&&#' *+ R#)! 1#%

R!'#% P&(!& C&&#'

&ela' Para"eter (As per t)e attac)e Annexure 1* IR



A

S&

0.

VA

M!( P&*'#'(<# &#)! B&%#=B&%# > CT &#(&##' *+ M(* &#)!1?

'

30

1

T&!1+*&#& D(++#&#'(!) R#)! O#&!'(" '(#=A1 #& A#&#-I?

IS

0.02

A

M(( S#''(" *+ R#)!

'CB

40

1

M(( S#''(" *+ R#)!

+econar' ea Para"eter IL

350



AL

6

2



-

& L

3.746

Ω/k

S(")# ,! )#"' *+ )#!%1 C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75 *C

P!"# 5

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING B.1.

B.1.

DOC. NO. CU-47000-0202 REV. 0

Transfor"er Para"eter --

000

MVA

VP

765

kV

T&!1+*&#& MVA R!'(" P&(!& V*)'!"# R!'("

VS

400

kV

S#*%!& V*)'!"# R!'("

--

4



P#&#'!"# I#%!#=A1 #& TS#(+( !'(*@V*)-III 0706-47ES-730 R#<.* C).2..@!"# 3 > GTP?

/etails of &ela' Propose



R#)! T#

: T&!1+*&#& %(++#&#'(!)@ M(* P633

2

R!'#% C&&#'@I R

: A

3

S*&' '(# &&#' !&&(" !!('@I' =&#)!?

: 00 ; IR +*& 1  00 ;  A +*& 1  00A

4

M!( &#)! (' &&#' %&(" '&*" +!)'@ I +:

+*& 1#

S*&# +##% *1(%#&#% +&* 765 V 1(%# !% +!)' &&#' '!k# !1 #& !))!'(*1 !' S). N*.. =/? /#)*,

IPSCIPN ; ISN  030600 ;  00A I'=&#)!? F

 6.44A

5

$)) )*!% C&&#'@I L

 MVA=-3  VP?  000 ; 000.732 ; 400  443A

B.1.8 

T)roug) ault Current T)roug) ault 3VA of Transfor"er

: MVA R!'(" I#%!#  000 ; 004  14$.83VA

2

T)roug) ault Current on +econar' sie of Transfor"er 5 P+C(3V*#

$!)'-MVA=-3 ;VP?  742.6=.732400?  10.%1kA

P!"# 6

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING B.1.<

DOC. NO. CU-47000-0202 REV. 0

or"ula an &e2uire"ents T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&ate +'""etrical +)ort Circuit Current factor(6 ssc*

A1 #& IEC 44-6=C).3.5?

SSC

 I1#IPN  40 ; 000600  25.00

+tanar Value of 6 ++C

2

 $,

A1 #& IEC 44-6=C).4.?

Pri"ar' Ti"e Constant(T P* $*& '# S1'# C)*1# ( $!)'

;R 30 LR 30=2;3.4;50?

T#&#+*&#@ P&(!& T(# C*1'!'=T P? !' 11'# +!)'



0.061#  5.541#

+tanar Value of T P

3

 1$0

A1 #& IEC 44-6=C).4.3?


 C-'H-O

,#&# 'H  D&!'(* *+ +(&1' &&#' +)*, 'H '  'CB  701 +electe /ut' C'cle

4



=1! 0 1?

C-80"s-7

&esisti9e Buren(External Buren* &5  ($.5.r  :1000*

T,* ,! )#!% (1'!#

= IL350 M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'?  =23503.746000?  $.$@

&r  +r:5r $

R#)! /&%# * CT

 0.2  0.10@

P!"# 7


DOC. NO. CU-47000-0202 REV. 0 &b  RIR&  $.$$@


5

 ,.00@

Vk; 6  (&CT>&5*

6nee Point Voltage

Conition 1

Conition $

A1 #& IEC 44-6=C).4.5?

Applicable 5f x (:&*

 ,00 x 5+!

6.44 ; 30

 500 ; 

3.325

 500

!ot Applicable ,00 x 5+!

 5f x (:&*



1$00

500 ; 

 25 ; 30



200

 3.325



200

500

As Conition $ is satisfie 6= 6 0.14 x 5f x (:&* 0.4 ; 6.44 ; 30  $.0

Vk; 6 x (&CT>&5* K 27.06=52.62? ; $0.$V

Vk  $,0.00V

6

&ate E2ui9alent &ate + econar' e.".f

Eal

 11  '%  =RCT  R/?  ISN

=-'HTP? ? 6t  6tf  2  (  +  T P  =  - #

23.450=0.2?=-E;P=-0.00.2??

P!"# 


DOC. NO. CU-47000-0202 REV. 0 6t  6tf  1<.%%

Eal

 11 ; '% ; =R'  R/? ; I1

Eal

 48%%.1V

25.33=55?

As E2ui9alent &ate +econar' e.".f is greater t)an 6nee Point Voltage= CT is capable of suppl'ing Eal to t)e rela' circuit. B.$.10 &esults 5 & ! 4 ' ( & ! P ' ? - N P % # = & I # & ' ! 0 3 ! R C T

? N 5 & I S ! = % ' % - # & # * ' 2 & ! # 0 R S C

? + = 5 2 # % 0 # : ' ! # & R $

=A? 600

=A? 

=89? 50

) ! ' ? & 4 6 * & ' I 6 # = S 6 ' % T # # # & ' & 4 0 ! ( R T C

+ # ? 6 * ' I 4 ) = - ( ' * T ! ( ' ' 4 ! & & # & & * # & 0 6 6 0 D S T C

2 ( ? 4 ! 5 - % 5 I = ' D % # # & ' & ! 0 R C

& # 3 1 ! 1 1 ! C ) E C I

=1#? 

=kA? 00

=-? TP;

=kA? 40kA

P!"# 

& * ) ' ' 2 ! ( 2 0 ! ( 2 & ( & $ ' ' # C ' 4 & # & 4 * & 5 6 0 S S C

=-? 25

# 4 ( T ' 5 & ' ! ! 1 4 ( & * P C

=1? 20

5 ' 0 % % # ( + ( # 2 ) # 2 3 5

S C

=-? C-01-O

# < ( ' 1 # ( 1 % & # 0

R B

=Ω? 5Ω

" ( ' ( + . 4 4 ( . L # . . ( 0 2 : # E S =V? 434V

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B

B.$

CT sizing calculation for 400kV Transfor"er /ifferential Protection(8TB*-o? 5"peace Protection

B.$.1

Applicable CT an core !u"bers#

B.$.$

B.$.%

B.$.4

B.$.,

$##%#& D#'!()

CT R!'(*

CT N*

C*&#

ICT-

600

400-6-CT

4

ICT-2

600

400-7-CT

4

R#+. D&!,(" N*. 765400kV U!* 1/1'!'(* SLD:CU-47000-000@R#<.00


V!)#

U('

V

420

kV

I1#

40

kA

'



1

+ 

50

89

;R

30

-

D#1&('(* N*(!) V*)'!"# P&(!& S*&' C(&(' C&&#' M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#


600

A

ISN



A

R!'#% S#*%!& C&&#'

RCT

5

Ω

CT R#1(1'!# !' 75 *C

R!'#% I' C&&#' *+ BCU 1#%

R!'#% P&(!& C&&#'




A

S&

0.2

VA

M!( P&*'#'(<# &#)! B&%#=B&%# > CT &#(&##' *+ M(* &#)!1?

'

30

1

T&!1+*&#& D(++#&#'(!) R#)! O#&!'(" '(#=A1 #& A#&#-I?

IS

0.02

-

M(( S#''(" *+ R#)!

'CB

40

1

M(( S#''(" *+ R#)!


00



AL

6

2



-

& L

3.746

Ω/k

S(")# ,! )#"' *+ )#!%1 C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75 *C

P!"# 0

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B B.$.

B.$.


000

MVA

VP

765

kV

P&(!& V*)'!"# R!'("

T&!1+*&#& MVA R!'("

VS

400

kV

S#*%!& V*)'!"# R!'("

--

4



P#&#'!"# I#%!#=A1 #& TS#(+(!'(*@V*)-III 0706-47ES-730 R#<.* C).2..@!"# 3 > GTP?




R#)! T#

: T&!1+*&#& %(++#&#'(!)@ M(*P643

2

R!'#% C&&#'@IR

: A

3

S*&' '(# &&#' !&&(" !!('@I ' =&#)!?

: 00 ; IR +*& 1  00 ;  A +*& 1  100A

4

M!( &#)! (' &&#' %&(" '&*" +!)'@ I+:

+*& 1#

S*&# +##% *1(%#&#% +&* 765 V 1(%# !% +!)' &&#' '!k# !1 #& !))!'(*1 !' S). N*.. =/? /#)*,

IPSCIPN ; ISN  030600 ;   .44A

5

$)) )*!% C&&#'@I L

00A I'=&#)!? F

 MVA=-3  VP?  000 ; 000.732 ; 400  144%A

B.$.8 


: MVA R!'(" I#%!#  000 ; 004  14$.83VA

2

T)roug) ault Current on +econar' sie of Transfor"er 5P+C(3V*#

 $!)'-MVA=-3 ;VP?  742.6=.732400?  10.%1kA

P!"# 

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B B.$.<

or"ula an &e2uire"ents-3etering T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&ate +'""etrical +)ort Circuit Current factor(6 sec*

A1 #& IEC 44-6=C).3.5?

SSC

 I1#IPN  40 ; 000600  25.00

+tanar Value of 6 ++C

2

 $,


;R 30 LR 30=2;3.4;50?

T#&#+*&# P&(!& T(# C*1'!'=TP? !' 11'# +!)'



0.061#  5.541#

+tanar Value of T P

3

 1$0


 C-'H-O

,#&# 'H  D&!'(* *+ +(&1' &&#' +)*, 'H '  'CB  701 +electe /ut' C'cle

4



=1! 0 1?

C-80"s-7


T,* ,! )#!% (1'!#

= IL00 M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'?  =2;00;3.746000? 

&r  +r:5r $

R#)! /&%# * CT

 0.22 

P!"# 2

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B R/  RIR&  0.949Ω


5



As per 5EC 44-(Cl.4.,*

Vk; 6  (&CT>&5*

6nee Point Voltage

Conition 1 I+  5  ;R  40

  0.04  I+  =;R24.25?  0.06  =;R77?

Conition $ I+  5@ 40  ;R  20

  2  I+ 6

Conition % 5  I+  0@ 5 ;R  40

  0.4  I+  =-;R-5?  0.44  =;R202.5?

Conition 4 5  I+  0@ 40 ;R  20

  -7.3  I+  2

Conition , 5  I+  20@ 5 ;R  40

  0.06  I+  =;R-52.5?  .  =-;R74.?

Conition  0  I+  20@ 40  ;R  20

  -0.  I+  45

!o? 5f .44 an :&  %0= ence DConition , is consiereD= T)erefore#

  0.06   =;R-52.5?  .  =-;R74.? 57.3

Vk; 6  (&CT>&5* %$8.4,V

Vk  350.00V

6


P!"# 3

DOC. NO. CU-47000-0202 REV. 0


Eal

 11  '%  =RCT  R/?  ISN

=-'HTP? ? 6t  6tf  2  (  +  TP  =  - #

2  3.4  50  =0.2?  =-#=-0.00.2??  

6t  6tf  1<.%%4

Eal

 11 ; '% ; =R'  R/? ; I1 25  .334  =55?  

Eal

 48%%.10%81%

As E2ui9alent &ate +econar' e.".f is greater t)an 6nee Point Voltage= CT is capable of suppl'ing Eal to t)e rela' circuit. B.$.10

&esults 5 & ! ' 4 ( & ! ' ? P N P % I & = # # ' & ! 0 3 ! R C T

? N 5 & I S ! ' = % % * # & # 2 & ' ! # 0 R S C

? + = 5 2 # % 0 # : ' # ! & R $

=A? 600

=A? 

=89? 50

) ! ' ? & 4 6 * & ' 6 # I = 6 ' S T % # & # # ' & 4 0 ! ( R T C

=kA? 40kA

+ # ? 6 * ' 4 ) I = - ( ' * T ! ( ' ' 4 # & & ! * & & & # 0 6 6 0 D S T C

2 ( ? 4 ! 5 - % 5 I = ' D % & # # ' & ! 0 R C

& # 3 1 ! 1 1 ! C ) E C I

=1#? 

=kA? 00

=-? TP;

P!"# 4

& * ) ( ' ' ! 0 2 ! 2 ( 2 $ & & ' ( ' # C ' 4 & # & 4 * & 5 6 0 S S C

=-? 25

# 4 ( T ' 5 & ' ! ! 1 4 ( & * P C

=1? 20

5 ' 0 % % # ( + ( # 2 ) # 2 3 5 S C

=-? C-01-O

# < ( ' 1 # ( 1 % & # 0 R B

=Ω? 5Ω

" ( ' + ( . 4 4 ( . L # . . ( 0 2 : # E S

=V? 434V


DOC. NO. CU-47000-0202 REV. 0

C.1

CT sizing calculation for 400kV 3etering Core

C.1.1

Applicable CT an core !u"bers# $##%#& D#'!() CT R!'(* ICT- 600 ICT-2 600 ICT- 600 ICT-2

C.1.$

;R

C.1.4

C.1.,

C.1.

2

R#+. D&!,(" N*. 765400kV U!* 1/1'!'(* S LD:CU-47000000@R#<.00 T(1 (1 !1 #& %(111(* !% * 2' O'*/#& 200@ ,(' '# <(#, '* *#' '(1 *&# +*& C(&(' B&#!k#& C*'&*) S,('(" S##



1

50 30

89 -

M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#

CT Para"eter =A1 #& S#(+(!'(* @V*)-III I1'&#' T&!1+*&#& 0706-47ES-7230 R#<.0.C).2..2? IPN 600 A R!'#% P&(!& C&&#' ISN



A

R!'#% S#*%!& C&&#'

RCT

4



CT R#1(1'!# !' 75 *C

SN

0

VA

R!'#% B&%#

5nstru"ent Para"eter (As per t)e attac)e Annexure 1* IM  A S&

0.5

VA

R!'#% I' C&&#' *+ BCU 1#% M!( /&%# *+ B! C*'&*) U('=A1 #& A#&#-I?

$S

5

-

SM



VA

R!'#% B&%# *+ M#'#& -

SM2



VA

R!'#% B&%# *+ M#'#& -2

+econar' ea Para"eter IL 530 AL 6



I1'&#' S#&(' $!'*&

S(")# ,! )#"' *+ )#!%1



2 -

C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ !/)# *#'#% '* CT 1#*%!&

3.746

k

AC (1'!# *+ 6 S. C@ )#!% !' 75 *C

000

MVA

765

kV

P&(!& V*)'!"# R!'("

VS

400

kV

--

4



S#*%!& V*)'!"# R!'(" P#&#'!"# I#%!#=A1 #& S #(+(!'(*@V*)-III 070647ES-730 R#<.* C).2..@!"# 3?

& L C.1.

400-6-CT

C*&# N*. 3 3 2

+'ste" Para"eter =A1 #& S#(+(!'(*@V*)-II G##&!) T#(!) R#(&##' 0706-47ES-0200 R#<.0 C).6.? V!&(!/)# V!)# U(' D#1&('(* V 400 kV N*(!) V*)'!"# I1# 40 kA P&(!& S*&' C(&(' C&&#' ' + 

C.1.%

600

CT N* 400-3-CTT 400-6-CTT 400-3-CT

Transfor"er Para"eter -VP

T&!1+*&#& MVA R!'("

or"ula an &e2uire"ents-3etering

P!"# 5

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B 

DOC. NO. CU-47000-0202 REV. 0

&esiti9e Buren S lead

=

=2.IL.RL000?ISN2

S T

=

S lead +S r + S M1+ S M2

T,* ,! )#!% /&%# ( VA = IL530 M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'? %.<VA

.1$VA 2

5nstru"ent +ecuirt' actor +CT

RCT ISN2



 52  4.00VA +



$1;=SNSCT?=STSCT?  .<$ 20 ; ISN

&ate s)ort ti"e carr'ing capacti' of Ba' Control Fnit    ISN ; $SH



 ; 6.2  .<$

20 20A  $0A

ence= 5+ aopte is  , C.1.8

&esults 5 & ! ' 4 ( & ! ' ? P N - P % # I # & ' & = ! 0 3 ! R C T

? 5 N & S I ! = % ' % # & # * ' 2 & ! # 0 R S C

? + = 5 2 # % 0 # : ' # ! & R $

=A? 600

=A? 

=89? 50

) ! ' ? & 4 6 * & ' I 6 # = 6 ' S % T # # & # ' & 4 0 ! ( R T C

=kA? 40kA

+ # ? 6 * ' I 4 ) = - ( * T ! ' ( ' ' 4 # & & ! & * # & & 0 6 6 0 D S T C

=1#? 

2 ( ? 4 ! 5 - % 5 I = ' D % # # & ' & ! 0 R C

=kA? 00

P!"# 6

# % & 0 B % # ' ! R

=VA? 0

& * ' 2 ' ! - $ # 5 ' ( 4 & 0 & 0 ' 1 2 # - S I

=-? 5

+ 5 * 2 ! 1 & 1 0 ! 2 ) 2 C !

R

=-? 0.2

=? 5

T C


DOC. NO. CU-47000-0202 REV. 0

/.1

CT sizing calculation for 400kV 79er Current an Eart) ault Protection

/.1.1

Applicable CT an core !u"bers# $##%#& D#'!()

/.1.$

/.1.%

/.1.4

/.1.,

CT R!'(*

CT N*

C*&#

R#+. D&!,(" N*. 765400kV U!* 1/1'!'(* SLD:CU-47000000@R#<.00

ICT-

600

400-6-CTT

4

ICT-2

6002

400-7-CTT

4


V!)#

U('

V

420

kV

I1#

40

kA

'



1

+ 

50

89

;R

30

-

D#1&('(* N*(!) V*)'!"# P&(!& S*&' C(&(' C&&#' M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#


600

A

ISN



A

R!'#% S#*%!& C&&#'

RCT

5

Ω

CT R#1(1'!# !' 75 *C

R!'#% I' C&&#' *+ R#)! 1#%

R!'#% P&(!& C&&#'




A

S&

0.04

VA

O<#& C&&#' P&*'#'(* R#)! B&%#=B&%# > CT R#(&##' *+ M(* R#)!1?


530



AL

6

2



-

& L

3.746

Ω/ k

S(")# ,! )#"' *+ )#!%1 C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75 *C

P!"# 7

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B /.1.

/.1.

DOC. NO. CU-47000-0202 REV. 0

Transfor"er P ara"eter --

000

MVA

VP

T&!1+*&#& MVA R!'("

765

kV

P&(!& V*)'!"# R!'("

VS

400

kV

S#*%!& V*)'!"# R!'("

--

4



P#&#'!"# I#%!#=A1 #& S#(+( !'(*@V*)-III 0706-47ES-730 R#<.* C).2..@!"# 3?




R#)! T#

2

R!'#% C&&#'@I R

3

=&#)!?

: B!k *<#& &&#' E!&' +!)' P&*'#'(* M(*-P4 @

: A 

: 00 ; I R +*& 1  00 ;  A +*& 1  00A

4

M!( &#)! S#*%!& I' C&&#' %&(" '&*" +!)'@ I + :

+*& 1#

IPSCIPN ; ISN  40000600 ;   $,.00A

/.1.8 

00A I'=&#)!?F

T )roug) ault Cu rrent T)roug) ault 3VA of Transfor"er

: MVA R!'(" I#%!#  000 ; 004  14$.83VA

2

$!)'-MVA=-3 ;VP?

T)roug) ault Current on +econar' sie of Transfor"er 5 P+C(V*#

 742.6=.732400?  10.%1kA

/.1.<

or"ula an &e2uire"ents-Backup o9er current Eart) fault Protection T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&esisti9e Buren &5  ($.5.r  :1000*

T,* ,! )#!% (1'!#

= IL530 M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'?  =2 ; 530 ; 3.746  000?

P!"# 

PROJECT: 765k V UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B

DOC. NO. CU-47000-0202 REV. 0 

&r  +r:5r $

R#)! /&%# * CT

 0.042 

2

VA Buren an Accurac' class of CT in VA +cal  5+!$G(&l > &r * 

+re2 ; +cal

+CT  5+!$G&CT 

Protection Class of CT Protection Class

,P$0

=T# 5P20 )!11 CT 1!)) *) ,('( **1('# #&&*& *+ =-? 5 +*& 20 '(#1 '# &!'#% CT &&#' +)*, !' &!'#% /&%#.? A&! L((' !' R!'#% B&%#@ AL$&

 20

R!'#% B&%# *+ CT@ VA&

 30.00VA

A'!) B%#

 4.0VA

A&! L((' !' R!'#% B&%#@ AL$&

 AL$&  =VA&  SCT?=S&#  SCT? 8

O

A&! L((' C&&#' &#+#&&#% '* '# 1#*%!& *+ '# CT +*& 5P20

 A&! L((' !' R!'#% B&%#@ AL$&  I& 8A

P!"# 


DOC. NO. CU-47000-0202 REV. 0

T# CT 1#*%!& &&#' %&("  I1IP ; I1

! 11'# +!)' *%('(*

 =0.3 ; 000?600 ;   .44A

S(# '# !( +!)'  &&#' 1## / '# CT (1 ) #11 '! '# A&! L((' C&&#' # (+#& '!' '# **1('# #&&*& ,()) /# ,('( '# )(('. 8## 5P20 )!11@ 30VA CT (1 !%#!'#. /.1.10

&esults 5 & ! 4 ' ( & ! P ' ? - N P % # I # & ' & = ! 0 3 ! R C T

? N 5 & I S ! = % ' % # # * ' & 2 & ! # 0 R S C

? + = 5 2 # % 0 # ' : ! # & R $

=A? 600

=A? 

=89? 50

) ! ' ? & 4 6 * & ' I 6 # = S 6 ' % T # # & # ' & 4 0 ! ( R T C

=kA? 40kA

+ # ? 6 * ' I ) = 4 - ( ' * T ! ( ' ' 4 # & & & ! & * # & 0 6 6 0 D S T C

2 ( ? 4 ! 5 - % 5 I = ' D % # # & & ' ! 0 R C

& # 3 1 ! 1 1 ! C ) E C I

=1#? 

=kA? 00

=-? 5P20

P!"# 20

# % & 0 B % # ' ! R

=VA? 30

T C

R

=Ω? 5

DOC. NO. CU-47000-0202 REV. 0


/.$

CT sizing calculation for 400kV BB= 79er current an Eart) ault Protection

/.$.1


/.$.$

/.$.%

/.$.4

$##%#& D#'!()

CT R!'(*

CT N*

C*&#

ICT-

600

400-6-CT

3

ICT-2

6002

400-7-CT

3

R#+. D&!,(" N*. 765400kV U!* 1/1'!'(* SLD:CU-47000-000@R#<.00


V!)#

U('

D#1&('(*

V

420

kV

N*(!) V*)'!"#

I1#

40

kA

P&(!& S*&' C(&(' C&&#'

'



1

+ 

50

89

;R

30

-

M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#


600

A

R!'#% P&(!& C&&#'

ISN



A

R!'#% S#*%!& C&&#'

RCT

5

Ω

CT R#1(1'!# !' 75 *C




A

S&

0.04

VA

R!'#% I' C&&#' *+ BCU 1#% O<#& C&&#' P&*'#'(* R#)! B&%#=B&%# > CT R#(&##' *+ M(* R#)!1?

P!"# 2

DOC. NO. CU-47000-0202 REV. 0


/.$.,


00



AL

6

2



-

3.746

Ω/k

--

000

MVA

VP

765

kV

P&(!& V*)'!"# R!'("

VS

400

kV

S#*%!& V*)'!"# R!'("

--

4



P#&#'!"# I#%!#=A1 #& S#(+(!'(*@V*)-III 0706-47ES-730 R#<.* C).2..@!"# 3?

& L

/.$.

/.$.

C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75 *C

Transfor"er Para"eter T&!1+*&#& MVA R!'("




R#)! T#

2

R!'#% C&&#'@I R

3

S(")# ,! )#"' *+ )#!%1

B&#!k#& $!()&#@ B!k O<#& C&&#' > E!&' +!)' P&*'#'(* M(*: P24 @

: A 

: 00 ; IR +*& 1

=&#)!?

 00 ;  A +*& 1  00A

4

M!( &#)! (' &&#' %&(" '&*" +!)'@ I +



+*& 1#

IPSCIPN ; ISN  40000600 ;   25.00A

P!"# 22

00A I'=&#)!?F

DOC. NO. CU-47000-0202 REV. 0


/.$.8 


: MVA R!'(" I#%!#  000 ; 004  14$.83VA

2

T)roug) ault Current on +econar' sie of Transfor"er 5f(3V*#

$!)' MVA=-3 ;VP?  742.6=.732400? 

/.$.<

10.%1kA

or"ula an &e2uire"ents-Backup o9er current Eart) fault Protection T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&esisti9e Buren &5  ($.5.r  :1000*

T,* ,! )#!% (1'!#

= IL530 M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'?  =2;350;3.746000? 

&r  +r:5r $  0.042 

2

VA Buren an Accurac' class of CT in VA

P!"# 23

R#)! /&%# * CT

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B +cal  5+!$G(&l > &r * 

+re2 ; +cal

+CT  5+!$G&CT 

Protection Class of CT Protection Class

,P$0

A&! L((' !' R!'#% B&%#@ AL$&



20

R!'#% B&%# *+ CT@ VA&



30.00VA

A'!) B%#



0.7VA

A&! L((' !' R!'#% B&%#@ AL$&



AL$&  =VA&  SCT?=S&#  SCT? 14 VA

A&! L((' C&&#' &#+#&&#% '* '# 1#*%!& *+ '# CT +*& 5P20



A&! L((' !' R!'#% B&%#@ AL$&  I& 14A

T# CT 1#*%!& &&#' %&(" ! 11'# +!)' *%('(*



I1IP ; I1

P!"# 24

DOC. NO. CU-47000-0202 REV. 0

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B 

=0.3 ; 000?600 ; 



.44A

B!1#% * T&*" $!)' C&&#' !' D.2.-=2?

S(# '# !( +!)' &&#' 1## / '# CT (1 )#11 '! '# A&! L((' C&&#' # (+#& '!' '# **1('# #&&*& ,()) /# ,('( '# )(('. 8## 5P20 )!11@ 30VA CT (1 !%#!'#.

/.$.10

&esults ' ! ' # & & 0 C 5 & ! 4 ( & P ? N P % I # = ' ! 3 ! R T

5 & ! % - ? * N 2 S I # = S ' % # # & & ' ! 0 R C

=A?

=A?

600



? 6 ' = # I ' 4 ( # T & & ' & 0 * C 6 ) S ! % 4 # & ' # ! 6 R T

# ? 4 ( ' T 6 I ' ' & = * # 6 & S & + 0 * C - ) * ! ( ' 4 & ! & # 0 6 D T

=89?

=kA?

50

40kA

? + = 5 2 # 0 : # & $ % # ' ! R

P!"# 25

2 ( ? 4 ! 5 - % 5 I = ' D % # # & ' & ! 0 R C

C E I & # 3 1 ! 1 1 ! ) C

# % & 0 B % # ' ! R

R

=1#?

=kA?

=-?

=VA?

=Ω?



00

5P20

30

5

T C


DOC. NO. CU-47000-0202 REV. 0

E.1

CT sizing calculation for 400kV TEE-Protection

E.1.1


E.1.$

E.1.%

$##%#& D#'!()

CT R!'(*

CT N*

ICT-

3000

400-6-CTT

ICT-2

3000

400-7-CTT

ICT-

3000

400-6-CT

ICT-2

3000

400-7-CT

R#+. D&!,(" N*.

5

765400k V U!* 1/1 '!'(* SLD: CU-47000- 000@R#<.00


V!)#

U('

V

420

kV

N*(!) V*)'!"#

I1#

40

kA

P&(!& S*&' C(&(' C&&#'

'



1

+ 

50

89

;R

30

-

D#1&('(*

M!( %&!'(* *+ 1*&' (&(' &&#' S1'# 1) $&## ;R &!'(* *+ 11'#


3000

A

ISN



A

R!'#% S#*%!& C&&#'

6.

Ω

CT R#1(1'!# !' 75 *C

RCT

E.1.4

C*&#

R!'#% P&(!& C&&#'




S&

0.025

VA

M!( P&*'#'(<# &#)! B&%#=B&%# > CT &#(&##' *+ M(* &#)!1?

'

30

1

T&!1+*&#& D(++#&#'(!) R#)! O#&!'(" '(#=A1 #& A#&#-I?

IS

0.

-

'/

40

1

A

R!'#% I' C&&#' *+ BCU 1#%

M(( S#''(" *+ R#)! C(&(' B&#!k#& O#&!'(" T(#

P!"# 26

PROJECT: 765kV UNNAO SUBSTATION TITLE: 400kV CT SIZING ITEM CODE 7235-B2B E.1.,


530



AL

6

2



-

3.746

Ω/k

& L

E.1.

E.1.

DOC. NO. CU-47000-0202 REV. 0

S(")# ,! )#"' *+ )#!%1 C&*11 1#'(*!) !&#! *+ )#!%1 N* *+ &1 *+ !/)# *#'#% '* CT 1#*%!& AC (1'!# *+ 6 S. C@ )#!% !' 75*C


000

MVA

VP

T&!1+*&#& MVA R!'("

765

kV

P&(!& V*)'!"# R!'("

VS

400

kV

S#*%!& V*)'!"# R!'("

--

4



P#&#'!"# I#%!#=A1 #& S#(+(!'(*@V*)-III 0706-47ES-730 R#<.* C).2..@!"# 3?




&ela' T'pe

# Connection /iffrential= 3ico" P1$$

2

&ate Current=5&

# 1A

3

(rela'*

=

)

# 100  5& for 1s  00 ;  A +*& 1  00A

4

3axi"u" rea' input current uring t)roug) fault= 5 f

5

:5

+*& 1#

 5+!

 P+C P!

 400003000 ;   1%.%%A

5

ull loa Current=5 

00A I'=&#)!?F

 3VA:(-:% x VP*  000 ; 000.732 ; 400  144%A

E.1.<

or"ula an &e2uire"ents-3etering T# +*))*,(" +*&)!# !% &#(&##'1 !&# !)(#%



&ate +'""etrical +)ort Circuit Current factor(6 sec* SSC

A1 #& IEC 44-6=C).3.5?  IPSCIPN

P!"# 27


DOC. NO. CU-47000-0202 REV. 0  40000 ; 0003000  3.33


2

 1.,

A1 #& IEC 44-6=C).4.?


;R 30 LR 30=2;3.4;50?

T#&#+*&# P&(!& T(# C*1'!'=T P? !' 11'# +!)'



0.061#  5.541#

+tanar Value of TP

3

 1$0

As per 5EC 44-(Cl.4.%*


 C-'H-O

,#&# 'H  D&!'(* *+ +(&1' &&#' +)*, 'H '  '/  701 +electe /ut' C'cle

4

=S! 0 1?

 C-80"s-7


T,* ,! )#!% (1'!#

= IL530. M'& L*"#1' %(1'!# *+ CT !/)(" !1 #& L!*'?  =2;530;3.746000? 

&r  +r:5r $

R#)! /&%# * CT

 0..0252 

&b  RIR& 

P!"# 2


DOC. NO. CU-47000-0202 REV. 0


5



As per 5EC 44-(Cl.4.,*

+tabilising Voltage ; I+  =R)  RCT?  ==0.007  ;R?  .05?

Vs

K 3.33 ; =3.7  6.? ; ==0.007 ; 30?  .05? ; 180.<,V

6

6nee Point Voltage

Vk

; 4  Vs

K 4 ; 5 K 604

Aopte Vk

7

 %0V

Calculation of stabilizing resistor

R#)! 1#''(" V*)'!"#

V1

 0.5V

R#)! 1#''(" C&&#'

I1

 0.

R#)! B&%#

S&

 0.025

R#)! R#1(1'!#

R&#)!

 2.5

S'!/()(1(" R#1(1'*&

 =V1I1? - R&#)!  180 o)"s




E!) '%  '+ 

 11  '%  =RCT  R/?  ISN 2  (  +  TP  =  - #=-'HTP??  

2  3.4  50  =20000?  =-#=-0.00.2??  

P!"# 2


DOC. NO. CU-47000-0202 REV. 0 '%  '+ 

3.632

E!)

 5  3.632  =6.  5?  

E!)



<8V

As E2ui9alent &ate +econar' e.".f is greater t)an 6nee Point Voltage= CT is capable of suppl'ing Eal to t)e rela' circuit. E.1.10 &esults 5 & ! 4 ' ( & ! ' ? P N P % # = I # & ' & ! 0 3 ! R C T

? N 5 & I S ! = % ' % - # # * ' & 2 & ! # 0 R S C

? + = 5 2 # % 0 # ' : # ! & R $

=A? 3000

=A? 

=89? 50

) ! ' ? & 4 6 * & ' I 6 # = S 6 ' % T # # & # ' & 4 0 ! ( R T C

=kA? 40kA

+ # ? 6 * ' I 4 ) = - ( ' * T ! ( ' ' 4 # & & ! & & * # & 0 6 6 0 D S T C

2 ( ? 4 ! 5 - % 5 I = ' D % # # & & ' ! 0 R C

& # 3 1 ! 1 1 ! C ) E C I

=1#? 

=kA? 00

=-? TP;

P!"# 30

& * ) ( ' ' ! 0 2 2 2 ! ( & ( & $ ' ' # C ' 4 # & & 4 * & 5 6 0 S S C

=-? 7.5

# 4 ( T ' 5 & ' ! ! 1 4 ( & * P C

=1? 20

5 ' 0 % % # ( + ( # 2 ) # 2 3 5 S C

=-? C-01-O

# < ( ' # 1 ( 1 % & # 0 R B

=Ω? 5Ω

" ( ' + ( . 4 4 ( . L # . . ( 0 2 : # E S =V? 77V


DOC. NO. CU-47000-0202 REV. 0

4006V CT PA&A3ETE&+ 7& ,6V F!!A7 +FB+TAT57! /E+C&5PT57! $%,-1B-400kV Bus Protection T'pe R#)! T# R!'(* A&! )!11 B&%#=* +*& TP; > VA +*& 5P20@ M#'#&("? P&(!& T(# C*1'!' =1? 11 D' C)# RCT =*? E(
C7&E 1

C7&E $

C7&E %

C7&E 4

Bus-Bar Protection

3eteringG

ABB-RADSS 2000: TP;

C7&E ,

BCU 600: 0.2

BB= 7:C an E: Protection M(*-P42 600: 5P20

Transfor"er /iffrential Protection M(*-P643 600: TP;

5

0

30

5

5

20 20 C - 0.01# - O

NA NA NA

NA NA NA

20 25 C - 0.01# - O

20 7.5 C - 0.01# - O

5.5 542 30

5 NA NA

5 NA NA

5 30 30

6. 3645 20

TEE Protection M(*-P22 3000: TP;

!7TE G # T)is is as per iscussion )a on 1$t) 7ctober $010= ?it) t)e 9ie? to connect t)is core for Circuit Breaker Control +?itc)ing +c)e"e $%,-$B-400kV 5CT Protection T'pe

+pare

R#)! T# R!'(* A&! )!11 B&%#=* +*& TP; > VA +*& 5P20@ M#'#&("? P&(!& T(# C*1'!' =1? 11 D' C)# RCT =*?

2000: 5P20

E(
Transfor"er /iffrential Protection M(*-P633 600: TP;

3etering

7:C an E: Protection

TEE Protection

BCUE#&" M#'#& 600: 0.2

M(*-P4 600: 5P20

M(*-P22 3000: TP;

30

5

0

30

5

NA NA NA

20 25 C - 0.01# - O

NA NA NA

NA NA NA

20 7.5 C - 0.01# - O

5 NA NA

5 30 30

5 NA NA

5 NA NA

6. 3645 20


DOC. NO. CU-47000-0202 REV. 0 C&73PT7! H&EAVE+ T/ E!H5!EE&5!H P&7IECT /5V5+57!-HF&HA7!

ProJect Client Consultant Title +l. !o C1. 

2

3 4 5 6 7 

C$.

,6V +ubstation at F!!A7 Fttar Praes) Po?er Trans"ission Corporation i"ite +!C-a9alin Co"pliance +tate"ent for 400kV CT-+izing ?it) reference to +!C "ail ate ,:10:$010 K Conference call on :10:$010. /escription CH &epl' +ubJect# Heneral T# !"#1 *+ '# %*#' !&# *' /#&#% ## (' (1 *' *11(/)# '* *#' ,(' N*'#% > C*)(#% !"# &#+#&##.T# 1!# ! /# /#&#%. CT S(9(" !))!'(* +*&!' *+ 765k< CT1 +*& U!* 11 ! /# +*))*9#% '* !('!( 1(()!&) *+ '# CT1 1(9(" %*#'.$*& !))!'(* &#+#& '* 765k< CT !))!'(* &#+#& '* 765k< CT CALCULATION AND $OLLO (# 44-6 &#*#%!'(* +*& !))!'(* *+ E!).P)#!1# (%(!'# )# =M!? !' '(1 <*)'!"#. $*& LBB &*'#'(* 40kA 1' /# *1(%#&#% =I' 1' *<#& /1(" +!)'1 '**?.C!))!'(* ! /# &#<(1#% !*&%(") P)#!1# *+(& '!' #(1'(" BB P&*'#'(* CT1 !<# 2000 CTR. T* *<#& B1(" +!)'1@%#1(" CT /!1#% * 40kA@SSC40kA60025 R#!))!'# %' )# ,(' &#)! *#&!'(" '(# *+ 01 !% CB *#&!'(" '(# *+ 401 .T# %' )# ,()) /# C-0 O. $*& *<#& &&#' &*'#'(* 40kA 1' /# *1(%#&#% !% &#!))!'# !*&%("). A * *+ !"# &#"!&%(" 765kV CT 1!& *+ U!* 11 (1 !''!#%.$*& 400kV CT 1(()!& 1!& 1##' ! /# &#!&#% !+'#& !&&(<(" !' '# +(!) !&!#'#& / %*(" !))!'(*1 +*))*,(" '# 765kV CT !))!'(* +*&!'.

N*'#% > C*)(#%

N*'#% > C*)(#% N*'#% > C*)(#% N*'#% > C*)(#% N*'#% > C*)(#% N*'#% > C*)(#% N*'#% > C*)(#%

+ubJect# 400kV 5CT CT= $%,-$B= 400--CTT K 400--CTT Core1# M*%(+ *&# *=1!&# *&#? '* 5P20 ,(' 40VA *,#&-5P C)!11@30VA@AL$20 Core$# T# %(++#&#' !&!#'#&1 1!)) /# !1 +*))*,1 .S#'&(!) SC &&#' +!'*& 1*)% /# '!k# 25 (1'#!% *+ 7.5 .P&(!& '(# *1'!'-201 (1'#!% *+ 001. .S#(+(#% %' )#-C-0-O (1'#!% *+ 001

N*'#% > C*)(#%

N*'#% > C*)(#%


DOC. NO. CU-47000-0202 REV. 0 C&73PT7! H&EAVE+ T/ E!H5!EE&5!H P&7IECT /5V5+57!-HF&HA7!

ProJect Client Consultant Title +l. !o

C%.

,6V +ubstation at F!!A7 Fttar Praes) Po?er Trans"ission Corporation i"ite +!C-a9alin Co"pliance +tate"ent for 400kV CT-+izing ?it) reference to +!C "ail ate ,:10:$010 K Conference call on :10:$010. /escription Core%# M##'(" *&# 1*)% /# *+ 600 CTR .T# &!'#% /&%# 1*)% /# 0 (1'#!% *+ 30. .S#!&!'# *) '* /# !%%#% +*& R'

CH &epl' N*'#% > C*)(#%

Core4# S#!&!'# *) '* /# !%%#% +*&R'

N*'#% > C*)(#%

Core,# CTR *' #'(*#% @ (' 1*)% /# 3000 .R!'#% 1#*%!& &&#' ,&(''# !1 420A 1*)% /# *&&#'#% !1 A. .S#'&(!) S.C &&#' +!'*& 1*)% /# 7.5 (1'#!% *+ 5 .P&(!& '(# *1'!' 1*)% 201 (1'#!% *+ 001 .S#(+(#% %' )#-C-0-O S8OULD BE TACEN.

N*'#% > C*)(#%

+ubJect# 400kV Bus CT= $%,-1B= 400--CT K 400--CT Core1# 1*)% /# 1#% +*& TEE &*'#'(*

A1 #& PSLD-CU-47000-005@ C*&#  (1 1#% +*& BB P&*'#'(* C*&# 5 (1 1#% +*& TEE-P&*'#'(*

.CTR *' #'(*#% 1*)% /# 3000 !% 1#*%!& !#&# 1*)% /# A (1'#!% *+ 420A .S#'&(!) S.C &&#' +!'*& 1*)% /# 7.5 (1'#!% *+ 5 .P&(!& '(# *1'!' 1*)% 201 (1'#!% *+ 001 .S#(+(#% %' )#-C-0-O (1'#!% *+ C-00-O. .B&#!k *#&!'(" '(# '/ 1*)% /# '!k# * 401 ( )!# *+ 451.

N*'#% !% C*)(#% +*& C*&# 5

184306471-CT-Sizing

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