GEK-49861
Fo r a phas e t o phase fau l t whe r e IA - - I s,
o r
BURDENS
IA - Is
=
2 IA
=
0 . 27 ampe r e s
o r IA
=
0 . 1 3 ampe r e s
S i m i l a r l y f o r a t h r e e pha s e fau l t:
I A - I B
=
l/3 IA
=
0 . 27 ampe r e s
IA
=
0 . 15 ampe r e s
The po t en t i a l c i r cu i t bu rden pe r pha s e a t 120 vol t s RMS i s 0 . 4
vol t -ampe r e s , 0 . 2 wa t t s, 0 . 35 va r s .
The cu r r e nt c i r cu i t i mpedance pe r
c i r cu i t mea su r ed
a t
r a t ed
cu r r e nt i s g i ven i n Table V below .
TABLE V
CURRENT C IRCUI T BURDENS
RELAY CURRENT RATING
CURRENT CIRCUIT
Impedance, Z, in ohms
0.030
0.210
Resistance, R, in ohms
0.027
0.200
Reactance, X, in ohms
0.013
0.065
The c u r r e n t r equ i r emen t s a t the DC cont rol powe r i npu t ( s t uds 1 9
and 2 0 ) a r e g i ven i n Tabl e V I be low .
TABLE VI
DC CONTROL C IRCUI T BURDENS
RELAY RATED
DC VOLTAGE
CONDITION OF
CONTROL CIRCUIT
OUTPUT RELAY K2
BURDEN IN MILLIAMPERES
48
Dropped Out
48
Picked Up
1 10
Dropped out
110
Picked Up
125
Dropped Out
125
Picked Up
250
Dropped Out
250
Picked Up
t Input to Studs A and C of external
10
200
315
90
175
80
155
250t
250t
pre-regulator
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