ABB REF 610 Technical Reference Manual page 31

1MRS755310
Feeder Protection Relay
Technical Reference Manual
t/s
100000
10000
1000
100
10
1
1.05
0
1
Fig. 5.1.4.4.-2 Trip curves at prior load 0.7 x I
REF 610 REF 610
t[min]
90
60
40
25
15
10
5
1
I/I
10
q
θ
A040314
31