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Manual 37444F MSLC-2 - Master Synchronizer and Load Control

Deadbus Closure Mismatch Alarm

When a deadbus is detected and dead bus closing mode is activated by a Run or Permissive command, the

MSLC-2 is doing an additional security check before issuing a breaker closure command.

If there is a breaker (GCB and/or MCB) closed in the own segment and/or (own segment+1), then the alarm

“Deadbus closure mismatch” is set and the MSLC-2 will not close to a deadbus.

The alarm “Deadbus closure mismatch” (parameter 4620) shows the deadbus plausibility in ToolKit Menu 8. Addi-

tional, a Relay output: Alarm1, Alarm2 or Alarm3 can be assigned within ID 7598 in ToolKit Menu 0. Finally the

deadbus closure mismatch alarm is added internally to the “Centralized Alarm” and can be first detected therefore

in the ToolKit Homepage with the LED “Centralized Alarm”.

The Deadbus closure mismatch alarm is set with following detailed conditions:

Utility MSLC2:

 Precondition: Start Deadbus closure with energizing DI “Run” or DI “Permissive”

 A GCB in the own segment is closed and the busbar is dead

 Another MCB in the own segment is closed and the busbar is dead

Tie MSLC2:

 Precondition: Activate Deadbus closure by a Run or Permissive command

 GCB closed and busbar is dead on system A

 GCB closed and busbar is dead on system B

 MCB closed and busbar is dead on system A

 MCB closed and busbar is dead on system B

The deadbus closure mismatch alarm is reset (self-acknowledge) with following conditions:

 Still deadbus but no closed breaker in the same segment (via breaker open feedback received)

 Deadbus changes to “Voltage ok” on busbar in the detected segment with the closed breaker

 De energize DI “Run” or DI “Permissive”

Woodward MSLC-2 User Manual

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