LARSEN & TOUBRO LIMITED

ECC Division - EDRC

2 X 600 MW SINGHITARAI THERMAL POWER PROJECT, DOCUMENT NO DATE
PROJECT SINGHITARAI - CHHATTISGARH
O12020-E-TP-GE-DC-3022 05-06-2012
NEUTRAL GROUNDING RESISTOR SIZING PREPARED CHECKED APPROVED SHEET
TITLE
CALCULATION FOR 11.5 kV SYSTEM MAG MVMR SKW 2 of 9
2 of 8

NEUTRAL GROUNDING RESISTOR SIZING

CALCULATION FOR 11.5 kV SYSTEM

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 LARSEN & TOUBRO LIMITED
ECC Division - EDRC
2 X 600 MW SINGHITARAI THERMAL POWER PROJECT, DOCUMENT NO DATE
PROJECT SINGHITARAI - CHHATTISGARH
O12020-E-TP-GE-DC-3022 05-06-2012
NEUTRAL GROUNDING RESISTOR SIZING PREPARED CHECKED APPROVED SHEET
TITLE
CALCULATION FOR 11.5 kV SYSTEM MAG MVMR SKW 3 of 9
3 of 8

INDEX
0.0.0 PURPOSE AND SCOPE 3

1.0.0 SYMBOLS AND UNITS 3

2.0.0 REFERENCE STANDARDS 3

3.0.0 ASSUMPTIONS 3

4.0.0 INPUT 4

5.0.0 CALCULATION 4

6.0.0 RESULT 4
 LARSEN & TOUBRO LIMITED
ECC Division - EDRC
2 X 600 MW SINGHITARAI THERMAL POWER PROJECT, DOCUMENT NO DATE
PROJECT SINGHITARAI - CHHATTISGARH
O12020-E-TP-GE-DC-3022 05-06-2012
NEUTRAL GROUNDING RESISTOR SIZING PREPARED CHECKED APPROVED SHEET
TITLE
CALCULATION FOR 11.5 kV SYSTEM MAG MVMR SKW 4 of 9
4 of 8

0.0.0 PURPOSE AND SCOPE

The purpose of this document is to select optimum size of Neutral Grounding Resistor

1.0.0 SYMBOLS AND UNITS

!
" # $ % & ' " ( ) * + , '

kV

-
" # $ % & ' " ( . * + , '

kV

/ - 0 1 1 3 3
# # . " % , 2 ' 4 $ " ( . " 5 6 " # $ % & ' * + , '

Amp

1 3
4 " # $ % & ' % 6 % + # % 7 # ' % $ $ 8 ' 9 ' $ % # : " + 4 $

kV

R Resistance ;

1 3 0 1 1 3 3 3
% $ + " 4 " ( % # $ = ' 4 $ = " 4 * + , ' ' ,

t < sec

2.0.0 REFERENCE STANDARDS

NA

3.0.0. ASSUMPTIONS

NA
 LARSEN & TOUBRO LIMITED
ECC Division - EDRC
2 X 600 MW SINGHITARAI THERMAL POWER PROJECT, DOCUMENT NO DATE
PROJECT SINGHITARAI - CHHATTISGARH
O12020-E-TP-GE-DC-3022 05-06-2012
NEUTRAL GROUNDING RESISTOR SIZING PREPARED CHECKED APPROVED SHEET
TITLE
CALCULATION FOR 11.5 kV SYSTEM MAG MVMR SKW 5 of 9
5 of 8

4.0.0 ! " # $

% 1 2 3 3 4
% & ' ( ) * + & , - % . / 0 + %

% 6 2 7 7 8 9 4
% & ' ( ) * + & , 5 % . / 0 + %

2 7 @
: ; < ) ( / & = & , > ) ; ' ( ? ; < < + = ( ? & = . / 0 + < + 0 ( . + A

? B 5 ? 5 B

5.0.0 # $ C ! D

@ @
E ) F / G ; G A ; < < + = ( ( H ) ( A ) = , ' & I ( H < & I B G N O N + A / , / A ) ( / & = < + P ; / < + G + = ( Q

! J K L M D

% & ' ( ) * + ) R ) / ' ) S ' + ) ( ( H + + ; ( < ) ' & / = ( % = + A & = 0 ) < T H ) . + % & ' ( ) * +

! " L D "

Ö
% 6 U

M
L

8 4
%

L V V W

- + = A + X + . / . ( ) = A + < + P ; / < + 0 ( & ' / G / ( ( H + > ) ; ' ( ? ; < < + = (

% =

K L

L Y Y Z [ \ ]

L Y Y Z [ \ ]

6.0.0 RESULTS

& X ) ( / = * . H ) ' ' S +

D ! J K K

2 7 7 4
) ( + 0 R & ' ( ) * + %

2 @ @
) ( + 0 ? ; < < + = ( B G N

K M

2
+ . / . ( ) = A +

K Y Y Z [ \ ]

2 7 @
> ) ; ' ( ? ; < < + = ( : ; < ) ( / & = + A

^ 2
; ) = ( / ( T & _ .

W !