ABB REF 610 Technical Reference Manual page 25

Feeder protection relay
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1MRS 755310
Feeder Protection Relay
Technical Reference Manual
t/s
100000
10000
1000
100
10
1
1.05
0
1
Fig. 4.1.4.4.-3 Trip curves at prior load 1 x I
t[min]
90
60
40
25
15
10
5
1
I/I
10
q
n
REF 610
25

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