''Five Preventions'' Of High-Voltage Switchgear

1. After the vacuum circuit breaker trolley in the high-voltage switchgear is closed in the test position, the trolley circuit breaker cannot enter the working position. (Prevent closing with load)
2. When the grounding knife in the high-voltage switchgear is in the closed position, the trolley circuit breaker cannot enter the closed position. (Prevent closing with grounding wire)
3. When the vacuum circuit breaker in the high-voltage switchgear is closed, the rear door of the panel cabinet is locked with the cabinet door by the mechanical on the grounding knife. (Prevent entering the live interval by mistake)
4. When the vacuum circuit breaker in the high-voltage switchgear is closed during operation, the closed grounding knife cannot be put into operation. (Prevent hanging the grounding wire with power)
5. When the vacuum circuit breaker in the high-voltage switchgear is closed during operation, the trolley circuit breaker cannot be withdrawn from the working position. (Prevent pulling the knife switch with load)