Voltage distribution cabinet products should achieve the following "five protections"

1. After the vacuum circuit breaker car in the high-voltage distribution cabinet is closed in the test position, the car circuit breaker cannot enter the working position. (To prevent accidental opening and closing of circuit breakers)

2. When the grounding knife in the high-voltage distribution cabinet is in the closed position, the car circuit breaker cannot be closed. (Prevent closing with grounding wire)

3. When the vacuum circuit breaker inside the high-voltage distribution cabinet is closed, the back door of the cabinet is locked with the mechanical device on the grounding knife. (To prevent accidental entry into charged intervals)

4. The vacuum circuit breaker inside the high-voltage distribution cabinet is closed during operation, and the grounding knife cannot be put into operation. (Prevent live hanging of grounding wires)

5. The vacuum circuit breaker inside the high-voltage distribution cabinet cannot exit the working position of the car circuit breaker when it is in operation and closed. (Prevent loaded knife switch)