Interlocking system for switchgear automation in double busbar substation
05/09/2025
- The tripping of all circuit breakers (CBs) by protective relays is unrestricted.
- The opening command for all circuit breakers, except for the busbar coupler circuit breaker, is unrestricted.
- An opening command cannot be issued for the busbar coupler circuit breaker under the following circumstances:
- Both busbar disconnect switches (DSs) of any feeder are closed.
- Any busbar disconnect switch or sectionalizing disconnect switch is in the transition state.
- A closing command cannot be given for a circuit breaker when its associated line disconnect switch or busbar disconnect switch is in the transition state.
- A line disconnect switch can only be operated when its associated circuit breaker and feeder earthing switch (ES) are open.
- A feeder earthing switch can only be operated when its associated line disconnect switch (if applicable) and busbar disconnect switch are open.
- A busbar disconnect switch can be operated when its circuit breaker, busbar earthing switch, feeder earthing switch, and the other busbar disconnect switch are all open (except for item 8).
- If a busbar disconnect switch is closed, the second busbar disconnect switch can only be operated when the relevant busbar sections are connected through the busbar coupler circuit breaker.
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