ABB SPAC 315 C User Manual And Technical Description page 103

t/s
700
600
500
400
300
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100
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
2
1
0.9
0.8
0.7
0.6
0.5
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1
Fig. 6. Long-time inverse-time characteristics of the overcurrent and earth-fault unit SPCJ 4D29.
2 3 4 5 6 7 8 9
k
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.05
I/I>
10 20
23