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The working principle of high voltage switchgear

2022-05-27 22:06

According to certain wiring methods, the manufacturer assembles the switchgear, busbars, measuring instruments, protective appliances and auxiliary equipment of the same circuit in a closed metal cabinet, and supplies the user as a complete set. High-voltage switches are generally suitable for power systems with AC 50 Hz and 3-35 kV voltages, and are used for on-off, monitoring and protection of electrical energy reception and distribution.

This kind of equipment has the characteristics of compact structure and convenient use, so it is widely used in equipment such as control and protection of transformers, high-voltage lines and high-voltage motors. The high-voltage switch manufacturing industry is an important part of the power transmission and transformation equipment manufacturing industry and occupies a very important position in the entire power industry.

Five defenses

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. (to prevent closing with load)

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

3. When the vacuum circuit breaker in the high-voltage switch cabinet is closed, the front and rear doors of the panel cabinet are locked with the machine on the grounding knife and the cabinet door. (To prevent entering the live interval by mistake).

4. The vacuum circuit breaker in the high-voltage switch cabinet is closed during operation, and the grounding knife cannot be closed and put into operation. (Prevent live and ground wire)

5. When the vacuum circuit breaker in the high-voltage switch cabinet is closed and running, it cannot exit the working position of the trolley circuit breaker. (To prevent the knife switch with load)

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