41-116.1C
12
COV Voltage Controlled Overcurrent Relay
Figure 3: Typical Tripping Characteristics of Type COV Relay
0
50
100
150
0
50
a 100
150
200
250
TRIP AREA
x
y
c
b
V
O
L
T
A
G
E
IN
P
E
R
C
E
N
T
O
F
N
O
R
M
A
L
CURRENT IN PERCENT OF FULL LOAD
The Trip Area May be Changed as Follows:
The line “bc” may be moved in the direction of arrow “y” by changing the voltage unit setting. The line
“ab” may be moved in the direction of arrow “x” by changing the CO unit tap setting. Tap value current
expressed in % Full Load defines line ab, and voltage unit setting expressed in % normal voltage de-
fines line bc.
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