ABB COV-8 Selebaran Instruksi - Halaman 9

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Halaman Cetak
ABB COV-8 Selebaran Instruksi
COV Voltage Controlled Overcurrent Relay
COV-8 INVERSE TIME AND COV-9 VERY INVERSE TIME RELAYS
Continuous
Ampere
Rating
Range
Tap
(Amperes)
0.5
0.6
0.8
0.5/2.5
1.0
1.5
2.0
2.5
2
2.5
3
2/6
3.5
4
5
6
4
5
6
4/12
7
8
10
12
Continuous
Ampere
Rating
Range
Tap
(Amperes)
0.5
0.6
0.8
0.5/2.5
1.0
1.5
2.0
2.5
2.0
2.5
3.0
2/6
3.5
4.0
5.0
6.0
4.0
5.0
6.0
4/12
7.0
8.0
10.0
12.0
*
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 high impedance type voltmeter.
ENERGY REQUIREMENTS
One Second
Rating *
(Amperes)
2.7
88
3.1
88
3.7
88
4.1
88
5.7
88
6.8
88
7.7
88
8
230
8.8
230
9.7
230
10.4
230
11.2
230
12.5
230
13.7
230
16
460
18.8
460
19.3
460
20.8
460
22.5
460
25
460
28
460
TYPE COV-11 RELAY
One Second
Rating *
(Amperes)
1.7
88
1.9
88
2.2
88
2.5
88
3.0
88
3.5
88
3.8
88
7.0
230
7.8
230
8.3
230
9.0
230
10.0
230
11.0
230
12.0
230
14
460
16
460
17
460
18
460
20
460
22
460
26
460
Power
At
At 3 Times
Factor
Tap Value
Tap Value
Angle Ø
Current
Current
72
2.38
71
2.38
69
2.40
67
2.42
62
2.51
57
2.65
53
2.74
70
2.38
66
2.40
64
2.42
62
2.48
60
2.53
58
2.64
56
2.75
68
2.38
63
2.46
60
2.54
57
2.62
54
2.73
48
3.00
45
3.46
Power
At
At 3 Times
Factor
Tap Value
Tap Value
Angle Ø
Current
Current
36
0.72
34
0.75
30
0.81
27
0.89
22
1.13
17
1.30
16
1.48
32
0.73
30
0.78
27
0.83
24
0.88
23
0.96
20
1.07
20
1.23
29
0.79
25
0.89
22
1.02
20
1.10
18
1.23
17
1.32
16
1.8
VOLT AMPERES * *
At 10 Times
At 20 Times
Tap Value
Current
21
132
21
134
21.1
142
21.2
150
22
170
23.5
200
24.8
228
21
136
21.1
142
21.5
149
22
157
22.7
164
24
180
25.2
198
21.3
146
21.8
158
22.6
172
23.6
190
24.8
207
27.8
248
31.4
292
VOLT AMPERES * *
At 10 Times
At 20 Times
Tap Value
Current
6.54
71.8
6.80
75.0
7.46
84.0
8.30
93.1
10.04
115.5
11.95
136.3
13.95
160.0
6.30
74.0
7.00
78.5
84.0
7.74
8.20
89.0
9.12
102.0
9.80
109.0
11.34
129.0
7.08
78.4
8.00
90.0
9.18
101.4
10.00
110.0
11.1
124.8
14.9
131.6
16.3
180.0
41-116.1C
Tap Value
Current
350
365
400
440
530
675
800
360
395
430
470
500
580
660
420
480
550
620
700
850
1020
Tap Value
Current
250
267
298
330
411
502
610
264
285
309
340
372
430
504
296
340
378
454
480
600
720
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