High Speed DC Circuit Breaker - G E Power Controls

4.3.7 Zero voltage release control unit
-S2
-X2 -X2
:7 :6
- X13
3 4
5
-K2
A1
Emergency STOP
signal
-K1
Emergency STOP
signal
A2
6
-
7
2
-X2
24 V
+
8
-S2
A1
A2
-K1 -K2
1
-X2
-D1
9 10
U<
36/ _ _ _ X _ _ _
• The EM-STOP signal is provided for resetting K2 on the SU-control circuit. It effects with priority in switching OFF (by ST or
UVR) before switching ON. Once switching ON and OFF signals are simultaneous, switching OFF command will stay
longer than switching ON. It means, that OFF command is master command.
• -S2 (-X2 :6/:7) is NO contact, predicted for indirect releasing of the UVR by relay -K2
• -S2 (-X2 :8/:9) is NC contact predicted for direct releasing of the UVR. If it’s not used, please short this connection permanently.
Fig. 28 UVR control circuit
Key position - 5
Key number – 00: Without shunt trip or zero voltage release.
Key number – 20: With zero voltage release.
22 Design and specifications are subject to change without notice 01/2008