Circuit Breaker; Figure 55: Blocking Conditions Of The Circuit Breaker In Pcm600; Figure 56: Single Line Diagram, The Circuit Breaker Is Closed And In The Test Position - ABB UniGear Digital Commissioning And Testing Manual

AP PAR ATU S CO NTR O L T E S TI NG
5.1.2

Circuit breaker

The circuit breaker can only be closed when the circuit breaker truck is in the test or
service position, not in the intermediate position.
The dedicated protection function for supervision of the circuit breaker operation is CBXCBR.
The circuit breaker can only be closed in the service position if the blocking coil RL1 is
energized.
Usually closing operation of the circuit breaker in the service position is supervised by the
protection relay (CBXCBR function). Protection relay controls blocking coil RL1.
In the test position the circuit breaker can be closed at any time. Blocking coil RL1 is not con-
trolled by the protection relay.

Figure 55: Blocking conditions of the circuit breaker in PCM600

Step 1/7
Move the circuit breaker into the test position and close it. Check the circuit breaker status
on the protection relay LHMI.

Figure 56: Single line diagram, the circuit breaker is closed and in the test position

1 VLG 500 0 17 C
PA N E L I NT ER N A L I NT ER LO C KI NG
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