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Schweitzer Engineering SEL-387-0 - Figure 3.37 IEC Short-Time Inverse Curve: C5

Schweitzer Engineering SEL-387-0
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3.76
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Differential, Restricted Earth Fault, Thermal, and Overcurrent Elements
Time-Overcurrent Curves
Figure 3.37 IEC Short-Time Inverse Curve: C5
10
20
30
40
50
60
70
80
90
100
1
2
3
4
5
6
7
8
9
.1
.2
.3
.4
.5
.6
.7
.8
.9
.01
.02
.03
.04
.05
.06
.07
.08
.09
100
123456789.5 .6 .7 .8 .9
90
80
70
60
50
40
30
20
10
Time in Seconds
Time in Cycles 60 Hz (50 Hz)
6000 (5000)
3000 (2500)
1500 (1250)
600 (500)
300 (250)
150 (125)
60 (50)
30 (25)
15 (12.5)
6 (5)
3 (2.5)
Multiples of Pickup
0.05
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00

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