100 Percent SEF Settings

TITLE : RELAY SETTING CALCULATIONS FOR GENERATOR RELAY PANEL FOR KOTHAGUDEM TPP

DOCUMENT NO. PE-DC-274-510-E014 REV NO. : 0 DATE : 04.09.2010 SHEET : 10 OF 16

GENERATOR VT VOLTAGE SUPPLY SUPERVISION RELAY (60VT1, 60VT2 & 60VT3) DEVICE NO. TYPE OF RELAY RATED VOLTAGE NO SETTING IS REQUIRED ON THE RELAY

: : :

60VT1, 60VT2 & 60VT3 MVAPM32 110V

: :

64G/R REG316

GENERATOR PROTECTION RELAY (64G/ 64R) DEVICE NO. TYPE OF RELAY

A) 100% GENERATOR STATOR EARTH FAULT PROTECTION (64G) NGT ratio, N1/N2 = 21kV / 220 V CONDITION 1: MAX. STAR POINT CURRENT, IEmax ./ / !"# R’Es + R’Ps ,& - 1 .0 $%&'&()*+,

=

7.8 A

/0222

$%&'&345

&, -

//2

/

1 & /0222

170.6 m!

CONDITION 2: INJECTION VOLTAGE, Uis = 1.7 V /

/

043 04 /&'& 23.12 m! and 082 0324= " " 31.01 m! R’Ps " 848 848 ASSUMING RPs = 25 m! R’Ps

67 04 /&'& 082 9:;7