ABB SPAJ 140 C - Page 51

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Fig. 4. Very inverse-time characteristics of the overcurrent and earth-fault unit SPCJ 4D29.
12
3
4
5
678910
20 I/I>
0.05
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
k
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
5
6
7
8
9
10
20
70
60
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40
30
t/s