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41-133S
Ampere
Continuous
Tap Value
TAP
Range
(Amperes)
0.5
0.6
0.8
1.0
0.5/2.5
1.5
2.0
2.5
2
2.5
3
2/6
3.5
4
5
6
4
5
6
7
4/12
8
10
12
IRD TIME OVERCURRENT UNIT BURDEN DATA AT HIGH CURRENTS
AMPERE RANGE
TAP VALUE CURRENT
MULTIPLES OF TAP VALUE CURRENT
††
VA
φ
P.F. ANGLE
†
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.
φ
Degrees current lags voltage at tap value current.
‡
Voltages taken with high impedance type voltmeter
18
ENERGY REQUIREMENTS
TIME OVERCURRENT UNITS: IRD-11, IRC-11, IRP-11
One Second
†
Rating
Rating
(Amperes)
1.7
56
1.9
56
2.2
56
2.5
56
3.0
56
3.5
56
3.8
56
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
Directional Overcurrent Ground Relays
At
Power
3 Times
Factor
Tap Value
Tap Value
φ
Angle
Current
Current
36
0.72
34
0.75
30
0.81
27
1.89
22
1.13
10.04
17
1.30
11.95
16
1.48
13.95
32
0.73
30
0.78
27
0.83
24
0.88
23
0.96
20
1.07
20
1.23
11.34
29
0.79
25
0.89
22
1.02
20
1.10
10.00
18
1.23
11.1
17
1.32
14.9
16
1.8
16.3
.5 - 2.5
.5
40
80
20
790
2600
380
46.7°
42°
37°
Types IRP, IRC and IRD
‡
VOLT AMPERES
At
At
10 Times
Tap Value
Current
6.54
71.8
6.80
75.0
7.46
84.0
8.30
93.1
115.5
136.3
160.0
6.30
74.0
7.00
78.5
7.74
84.0
8.20
89.0
9.12
102.0
9.80
109.0
129.0
7.08
78.4
8.00
90.0
9.18
101.4
110.0
124.8
131.6
180.0
1.0
2.5
40
8
1280
60
280
26.5°
4.8°
4.3°
At
20 Times
Tap Value
Current
250
267
298
30
411
502
610
264
285
309
340
372
430
504
296
340
378
454
480
600
720
16
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