TYPE COQ RELAY
(/)
Q
z
0
u
w
(/)
z
-
w
:i
100
90
80
70
60
50
40
30
'25
20
15
10
9
8
7
6
5
4
3
2.5
2
1.5
TIME
DIAL
SETTING
I
.5 .6 .7 .8 .9 1.0
1.5
2. '2.5 3
4
5 6 7 8 9 10
NEGATIVE
SEQUENCE CURRENT IN
PER
UNIT
(
1.0 PER U
NI
T
=
TAP VALUE CURRENT
)
Fig.
4-
Typical Operating Curves Of
The COO Relay.
27-D-5544
5
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