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Date：11-05-2021
What is a switchgear？
The switchgear is a kind of electrical equipment. The external line enters the main control switch in the cabinet first, and then enters the sub-control switch, and each branch is set according to its needs. Such as instrumentation, automatic control, motor magnetic switch, various AC contactors, etc., some also have high-voltage room and low-voltage room switch cabinets, high-voltage busbars, such as power plants, etc., and some also have low-cycle protection for main equipment Load shedding.
“Five Preventions” of High Voltage Switchgear
1. Prevent closing under load: After the vacuum circuit breaker trolley in the high-voltage switch cabinet is closed at the test position, the trolley circuit breaker cannot enter the working position.
2. Prevent closing with grounding wire: When the grounding knife in the high-voltage switch cabinet is in the closed position, the trolley circuit breaker cannot be closed.
3. Prevent accidental entry of the live interval: When the vacuum circuit breaker in the high-voltage switch cabinet is closing, the back door of the panel is locked with the machine on the grounding knife and the cabinet door.
4. Prevent live grounding: The vacuum circuit breaker in the high-voltage switchgear is closed when it is working, and the grounding knife cannot be put in.
5. Prevent the load-carrying switch: the vacuum circuit breaker in the high-voltage switchgear cannot exit the working position of the trolley circuit breaker when it is in operation.
