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For the same operat i ng cond i t i ons, the relay w i ll operate repeatedly w i th i n one or
two percent of t he same t i me.
The t i me curves for the d i rect i onally controlled IOC un i t s are s hown i n F i g.
15.
The t i me-current character i st i c of the H i -Se i sm i c non-di rect i onally controlled
IOC un i t i s s hown by F i g.
F i g.
17.
BURDENS
The burden of the potent i al polar i z i ng c i rcu i t at
The capac i t i ve burden of the potent i al polar i z i ng c i rcu i t of t he d i rect i onal
un i t at
cycle s and
60
g i ve s the current c i rcui t burdens of t he d i rect i onal uni t.
Table
10
g i ves
i nstantaneous overcurrent un i t.
controlled i nstantaneous overcurrent un i t.
the open corner of broken delta potent i al transformers and the current c i rcu i ts are
i n t h e res i dual c i rcui t s of current transformers.
i mposed for the durat i on of the ground fault and need be cons i dered only for t h i s
br i ef per i od.
DIRECTIONAL UNIT CURRENT CIRCUIT BURDEN AT
CIRCUIT
Operat i ng
Polar i z i ng
DIRECTIONAL UNIT CURRENT CIRCUIT BURDEN AT
CIRCUIT
Operat i ng
Polar i z i ng
GE K-49849
16
and i ts trans i ent overreach character i s t i c i s s hown by
=
VA
=
P.F.
volts i s
volt-amperes at
120
10
the
total
burden
Table
11
TABLE
Z { OHMS}
0.423
0.236
Z ( OHMS)
0.46
0.24
hertz i s:
50
7.04
0.851
0.86
of
the
t i me
overcurrent
g i ves the burden of the non-d i rect i on ally
Ord i nar i ly, the potent i al c i rcu i t i s i n
The burden is, t h erefore, only
9
50
HERTZ AND FIVE AMPERES
VA
P.F.
10.57
0.588
5.90
0.964
CYCLES AND FIVE AMPERES
60
VA
P.F.
12.0
0.52
6.0
0.95
10
power factor.
Table
un i t
plus
WATTS
6.22
5.70
WATTS
6.24
5.7
9
the
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