Schweitzer Engineering Laboratories SEL-587Z - Figure 3.26 I.E.C. Short-Time Inverse Curve: C5

3.28
SEL-587Z Instruction Manual Date Code 20020903
Relay Elements
Overcurrent Protection
Figure 3.26 I.E.C. 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
9
0
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