The role of high voltage switchgear

High voltage switchgear refers to the role of on-off, control or protection in the power generation, transmission, distribution, power conversion and consumption of the power system. High-voltage switch cabinets are used as electrical products with voltage levels ranging from 3.6kV to 550kV, high-voltage isolation switches and grounding switches, high-voltage load switches, high-voltage automatic reclosers and sectioners, high-voltage operating mechanisms, high-voltage explosion-proof power distribution devices, and high-voltage switch cabinets. Big category.

So what are the specific functions of the high-voltage switchgear?

High-voltage switchgear is a common name for metal-enclosed switchgear. It is a complete set of power distribution devices in which electrical equipment is assembled in a closed metal shell according to a certain circuit scheme.

High-voltage switch cabinets are widely used in power distribution systems for receiving and distributing electrical energy. Part of the power equipment or lines can be put into or out of operation according to the grid operation needs, and the faulty part can be quickly removed from the grid when the power equipment or line fails, so as to ensure the normal operation of the fault-free part of the grid, as well as equipment and Safety of operation and maintenance personnel. Therefore, the high-voltage switchgear is a very important power distribution equipment, and its safe and reliable operation is of great significance to the power system.

What are the five defenses of high-voltage switchgear?

1. 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. (Prevent closing with load)

2. When the grounding knife in the high-voltage switch cabinet is in the closed position, the trolley circuit breaker cannot enter the working position and close. (Prevent closing with ground wire)

3. When the vacuum circuit breaker in the high-voltage switchgear is closing, the front and rear doors of the panel are locked with the machine on the grounding knife. (Prevent the charging interval by mistake).

4. The vacuum circuit breaker in the high-voltage switchgear is closed during operation, and the grounding knife cannot be closed and 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 closed. (Prevent load broach)