Technical Guide
Testing self-powered relays with SVERKER 900
Page 22(33)
Table below summarizes the test results:
Test Nr.
WIC-1 Operate Time
pre-fault 250 mA / 1 s
Fault 7 A
WIC-1 Operate Time
NO pre-fault (switch onto fault)
Fault 7 A
1
202 ms
216 ms
2
203 ms
215 ms
3
203 ms
216 ms
4
202 ms
215 ms
5
203 ms
215 ms
AVERAGE
202,6 ms
215,4 ms
We can conclude that the additional time required by WIC-1 to start-up (some 10
… 20 ms) is negligible
compared to the operate time when the load current is available.
Switch onto fault condition (or fault in unloaded feeders) does not create any noticeable extra time delay in the
relay operation.
