Switchgear is a kind of electrical equipment, switchgear outside line first into the cabinet main control switch, and then into the sub-control switch, each sub-circuit according to its needs set. The main role of the switchgear is in the power system for power generation, transmission, distribution and electrical energy conversion process, to open and close, control and protect the use of electrical equipment.

Such as instrumentation, automatic control, motor magnetic switch, a variety of AC contactors, etc., some also have high-voltage room and low-voltage room switchgear, with high-voltage busbar, such as power plants, etc., some also have to protect the main equipment of the low week load shedding. Switchgear is mainly used in power plants, substations, petrochemical, metallurgical rolling steel, light industry and textile, factories and mining enterprises and residential communities, high-rise buildings and other different occasions.

High-voltage switchgear requires special attention to the "five preventions": 1.

1, high-voltage switchgear vacuum circuit breaker in the closing work, the back door of the panel cabinet with grounding knife on the mechanical and cabinet door latch. (To prevent accidental entry into the charged interval).

2, the vacuum circuit breaker in the high-voltage switchgear cabinet in the work of the closure, combined with the grounding knife can not be put into. (Preventing charged hanging ground wire)

3, the vacuum circuit breaker trolley in the high-voltage switchgear cabinet in the test position after closing, the trolley breaker can not enter the working position. (Prevent closing with load) 2. High-voltage switchgear cabinet within the grounding knife in the closing position, the trolley circuit breaker can not enter the closing. (Prevent closing with grounding wire)

4. The vacuum circuit breaker inside the high-voltage switchgear cabinet cannot exit the trolley breaker in the working closed position when it is operating. (To prevent pulling the switch with load)

5, high-voltage switchgear cabinet in the grounding knife in the closed position, the trolley circuit breaker can not enter the closed. (Prevent closing with grounding wire)