Knkong Electric Co.,Ltd

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Five protective measures for medium and low voltage switchgear

MV switchgear

Medium and low voltage switchgear equipment is used as electrical equipment for power transmission, power distribution, and power conversion. Used for power generation, power transmission, power distribution, power conversion, and power consumption equipment control. The product has a simple and reliable "five-proof" interlocking function to prevent misoperation. It has a novel appearance, smooth, concise, uniform color, thick and heavy proportion coordination, and the secondary wiring duct in the medium-voltage room is fully metal-protected, making the operation safer and more reliable. It has more human-machine interface, explosion-proof operation, and other characteristics. medium-voltage switchgear equipment system three-phase AC 50Hz, rated voltage 120Kv, and indoor complete power distribution device. It is used for power plants, substations, and industrial and mining enterprises to receive and distribute electrical energy, and has the functions of controlling, protecting, and monitoring circuits.

In fact, the medium and low voltage switchgear equipment enters the main control switch of the cabinet from the outside, and then enters the sub-control switch, which is set according to the self-report. For example instrument, motor magnetic switch, AC contactor, etc. medium and low voltage switch cabinets are divided into two categories, medium voltage switchgear and low voltage switchgear, and each category has a separate installation and distribution room.

1. After the vacuum circuit breaker and grounding knife in the medium and low voltage switch cabinet are closed at the test position, the trolley circuit breaker cannot enter the working position. Its role is to prevent the switch with load from closing.
2. When the domestic vacuum circuit breaker and grounding knife of the medium and low voltage switchgear are closed, the closing knife cannot be closed. Its role is to prevent the closing of the grounding wire.
3. When the vacuum circuit breaker in the medium and low voltage switch cabinet is closed during working operation, it cannot withdraw from the working position of the trolley circuit breaker. The rear door of the cabinet is locked with the machine on the grounding knife and the cabinet door. Its role prevents accidental entry into the live interval.
4. When the vacuum circuit breaker in the medium and low voltage switch cabinet is closed, the grounding knife cannot be put in. The back door of the cabinet is locked with the machine on the grounding knife and the cabinet door. Its role is to prevent live grounding.
5. After the vacuum circuit breaker in the medium and low voltage switch cabinet is closed at the experimental position of the trolley, the trolley circuit breaker cannot enter the working position or cannot withdraw from the working position. Its role is to prevent the broaching brake with the load.

Date:2020-06-12 10:20

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