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COV-8 INVERSE TIME AND COV-9 VERY INVERSE TIME RELAYS
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
Continuous
Ampere
Rating
Range
Tap
(Amperes)
0.5
1.7
0.6
1.9
0.8
2.2
0.5/2.5
1.0
2.5
1.5
3.0
2.0
3.5
2.5
3.8
2.0
7.0
2.5
7.8
3.0
8.3
2/6
3.5
9.0
4.0
10.0
5.0
11.0
6.0
12.0
4.0
14
5.0
16
6.0
17
4/12
7.0
18
8.0
20
10.0
22
12.0
26
*
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
One Second
Power
Rating *
Factor
Tap Value
(Amperes)
Angle Ø
88
72
88
71
88
69
88
67
88
62
88
57
88
53
230
70
230
66
230
64
230
62
230
60
230
58
230
56
460
68
460
63
460
60
460
57
460
54
460
48
460
45
TYPE COV-11 RELAY
One Second
Power
Rating *
Factor
Tap Value
(Amperes)
Angle Ø
88
36
88
34
88
30
88
27
88
22
88
17
88
16
230
32
230
30
230
27
230
24
230
23
230
20
230
20
460
29
460
25
460
22
460
20
460
18
460
17
460
16
VOLT AMPERES * *
At
At 3 Times
At 10 Times
Tap Value
Current
Current
2.38
21
2.38
21
2.40
21.1
2.42
21.2
2.51
22
2.65
23.5
2.74
24.8
2.38
21
2.40
21.1
2.42
21.5
2.48
22
2.53
22.7
2.64
24
2.75
25.2
2.38
21.3
2.46
21.8
2.54
22.6
2.62
23.6
2.73
24.8
3.00
27.8
3.46
31.4
VOLT AMPERES * *
At
At 3 Times
At 10 Times
Tap Value
Current
Current
0.72
6.54
0.75
6.80
0.81
7.46
0.89
8.30
1.13
10.04
1.30
11.95
1.48
13.95
0.73
6.30
0.78
7.00
0.83
7.74
0.88
8.20
0.96
9.12
1.07
9.80
1.23
11.34
0.79
7.08
0.89
8.00
1.02
9.18
1.10
10.00
1.23
11.1
1.32
14.9
1.8
16.3
41-116.1A
At 20 Times
Tap Value
Tap Value
Current
Current
132
350
134
365
142
400
150
440
170
530
200
675
228
800
136
360
142
395
149
430
157
470
164
500
180
580
198
660
146
420
158
480
172
550
190
620
207
700
248
850
292
1020
At 20 Times
Tap Value
Tap Value
Current
Current
71.8
250
75.0
267
84.0
298
93.1
330
115.5
411
136.3
502
160.0
610
74.0
264
78.5
285
84.0
309
89.0
340
102.0
372
109.0
430
129.0
504
78.4
296
90.0
340
101.4
378
110.0
454
124.8
480
131.6
600
180.0
720
11
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