What are the five protections of high-voltage switchgear?
Jul 05, 2022
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 in the closing position, the trolley circuit breaker cannot be closed. (Prevent closing with ground wire)
3. When the vacuum circuit breaker in the high-voltage switchgear is closed, the back door of the panel is locked with the machine on the grounding knife. (To prevent entering the live interval by mistake)
4. The vacuum circuit breaker in the high-voltage switchgear is closed during operation, and the closing ground knife cannot be put into operation. (Prevent live hanging of ground wire)
5. When the vacuum circuit breaker in the high-voltage switchgear is closed, it cannot exit the working position of the trolley circuit breaker. (To prevent the knife switch with load)
