41-133S
12
Directional Overcurrent Ground Relays
Types IRP, IRC and IRD
ENERGY REQUIREMENTS
INSTANTANEOUS OVERCURRENT UNIT OPERATING CIRCUIT- 60 HERTZ
AMPERE RANGE
TAP
VA AT TAP VALUE
P.F. ANGLE
VA AT 5 AMPS
P.F. ANGLE
φ
φ
.5−2
1−4
2−8
4−16
10−40
20−80
.5
.75
1.
1.25
1.5
2.
1.
1.5
2.
2.5
3.
4.
2.
3.
4.
5.
6.
8.
4.
6.
8.
9.
12.
16.
10.
15.
20.
24.
30.
40.
20.
30.
40.
48.
60.
80.
.37
.38
.39
.41
.43
.45
.41
.44
.47
.50
.53
.59
1.1
1.2
1.3
1.4
1.5
1.8
1.5
1.7
1.8
1.9
2.2
2.5
1.7
2.4
3.1
3.6
4.2
4.9
6.6
9.3
12.0
13.5
15.9
19.2
39
36
35
34
32
30
36
32
30
28
26
24
49
43
38
35
33
29
51
45
40
38
34
30
28
21
16
15
12
11
31
24
20
18
16
15
24.
13.
8.5
6.0
4.6
2.9
9.0
5.0
3.0
2.1
1.5
0.93
6.5
3.3
2.1
1.4
1.1
0.7
2.4
1.2
0.7
0.6
0.37
0.24
0.43
0.27
0.20
0.15
0.11
0.08
0.40
0.25
0.18
0.14
0.10
0.07
46
37
34
32
31
28
36
32
29
27
26
24
48
42
37
35
33
29
51
45
40
38
34
31
28
21
17
15
13
12
31
24
20
18
16
15
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.
Degrees current lags voltages.
†
φ
RANGE
CONTINUOUS RATING
ONE SECOND RATING
(AMPERES)
(AMPERES)
†
.5-2
1-4
2-8
4-16
10-40
20-80
5
8
8
10
10
10
100
140
140
200
200
200
RATINGS OF OVERCURRENT UNIT
