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Type COV Voltage
Controlled Overcurrent Relay
Frequency
60
50
+ Volt-Ampere burden is average for the various settings
Continuous
Ampere
Rating
Range
Tap
(Amperes)
0.5
2.7
0.6
3.1
0.8
3.7
0.5/2.5
1.0
4.1
1.5
5.7
2.0
6.8
2.5
7.7
2
8
2.5
8.8
3
9.7
2/6
3.5
10.4
4
11.2
5
12.5
6
13.7
4
16
5
18.8
6
19.3
4/12
7
20.8
8
22.5
10
25
12
28
*
Thermal capacities for short times other than one second may be calculated on the basis of time being inversely proportional to
the square of the current.
Ø Degrees current lags voltage at tap value current.
**
Voltages taken with Rectox type voltmeter
ENERGY REQUIREMENTS
VOLTAGE UNIT
Drop-Out
Adjustment
Volts
80-100
80-100
COV-6 OVERCURRENT UNITS
One
Second
Power
Rating*
Factor
(Amperes)
Angle Ø
88
88
88
88
88
88
88
230
230
230
230
230
230
230
460
460
460
460
460
460
460
Maximum
Volts
Continuous
132
132
60 HZ VOLT AMPERES ** (x
At Tap
Value
Current (∆ = .86)
69
3.92
68
3.96
67
3.96
66
4.07
62
4.19
60
4.30
58
4.37
67
3.88
66
3.90
64
3.93
63
4.09
62
4.12
59
4.20
57
4.38
65
4.00
63
4.15
61
4.32
59
4.37
56
4.40
53
4.60
47
4.92
Volt-Ampere +
Burden
Drop-Out
at 120 Volts
Ratio
8.0
7.2
∆
FOR 50 Hz)
At 20
At 3
At 10
Times
Times
Times Tap
Tap Value
Value
Value
Current
Current
Current
(∆ = .88)
(∆ = .90)
(∆= .91)
20.6
103
20.7
106
21
114
21.4
122
23.2
147
24.9
168
26.2
180
21
110
21.6
118
22.1
126
23.1
136
23.5
144
24.8
162
26.5
183
22.4
126
23.7
143
25.3
162
26.4
183
27.8
204
30.1
247
35.6
288
1056
41-116K
98%
98%
Tap
270
288
325
360
462
548
630
308
342
381
417
448
540
624
376
450
531
611
699
880
9
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