Principle of high voltage switchgear

1. After the vacuum circuit breaker trolley in the high voltage switch cabinet 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 switch cabinet is in the closed position, the trolley circuit breaker cannot be turned on or off. (Prevent closing with ground wire).

3. When the vacuum circuit breaker in the high-voltage switch cabinet is closed, the back door of the switch cabinet is locked with the grounding knife and the machine on the cabinet door. (Prevent the charging interval by mistake).