Five preventions of high voltage switchgear

1. After the vacuum circuit breaker trolley in the high voltage switchgear is closed at 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 closed, the trolley circuit breaker cannot be closed. (Prevent closing with ground wire)

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

4. The vacuum circuit breaker of high voltage switchgear is closed when it is working, and the grounding knife cannot be put into operation. (Prevent live connection to ground wire)

5. The vacuum circuit breaker in the high voltage switchgear cannot exit the working position of the trolley circuit breaker when it is working and closed. (Prevent load broach)