Technical Guide
Testing self-powered relays with SVERKER 900
Page 24(33)
I>>= 5 A
characteristic Definite Time
Time Delay t = 100 ms
The relay settings are entered in secondary values. The associated primary values depend on the ratio of the
main CTs connected to the relay.
The earth fault relay was not used in this application.
The relay settings have been entered manually from the local HMI into the relay with this procedure [4]:
Press
push ones on plus, now you are in ”Protection Setting”
Press
push plus or minus to change value then press
.
Enter password if necessary (“++++” is the default password) then press “Enter” again until selected value
comes up.
When I> value is set press
again to to set “Characteristic” repeate above to select. If password is
still valid only press “Enter” until selected choise comes up.
Repeate point 2 and 3 above to change the other parameters.
6.2.2. Connecting SVERKER 900 to WIP-1 relay.
SVERKER 900 is connected to the protection relay according to Figure 28, where the three phase currents and
the operate (trip) contact are shown.
The operate contact is an auxiliary contact usually available in the terminal block of the protection cubicle, which
“mirrors” the operate signal to the circuit breaker. The functionality of this last signal, connected instead to the
trip coil of the circuit breaker, is tested with the self-check of the tripping circuit shown in Figure 27.
