Local Breaker Backup Protection LBB 50Z or 50BF: Local Breaker Backup Protection is used to protect the generator when the generator’s circuit breaker failed to trip the generator during the fault condition. It is a backup protection of a generator. Principle of LBB protection: Mostly any fault on the generator, the trip command is directly … Continue reading Local Breaker Backup Protection LBB 50Z or 50BF