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The
nominal
sensitivities
relay ar e as follows:
1.
Polar izing Sensitivity:
Sensitivity is one percent (1%) of r ated voltage.
2.
Overcurrent Supervision Sensitivity:
Sensitivity is adjustable over the r ange shown in Table IV.
3 .
Oper ate Circuit Sensitivity:
See Figur e 11 for sensitivity in terms of VLL
The current sensitivity for
relationship:
wher e:
For example, if X
GEK-49861
for
TABLE IV
OVERCURRENT ADJUSTMENT RANGE
BASE REACH TAP
IN OHMS
0.1
0. 2
0. 4
0. 75
1. 5
3.0
0. 5
1. 0
2.0
3. 75
7.5
15. 0
I ) Z
(I
_
A
B
=
X
Actual Relay Reach
Nominal Relay Reach
I
- I
=
3(1-0.8)
0. 8 and ZR1
=
A
B
the
signal
quantities
0-0
ADJUSTMENT RANGE IN
AMPERES RMS
4
-
2
-
1
-
0.52
-
0.26
-
0. 13
-
0. 8
-
0. 4
-
0. 2
-
0.11
-
0.052
-
0.026
-
0.032 (1 rated )
phase pair
Rl
1-
=
X
0·16
0.27 amperes
3
=
ohms, then:
=
9
in
the
10
10
10
10
10
10
2
2
2
2
2
2
x
1!!1
100
A - B is given by the
SLY81
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