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How to Properly Operate the High Voltage Switch Cabinet to Avoid Burnout?

Mar. 09, 2020

High Voltage Switch Cabinet and other parts of the cabinet should be surface electrostatic sprayed. Proper operation can prevent burning out of high-voltage switchgear equipment. The creepage distance of the insulator is greater than 230mm, and the air gap between the baffle and the live part should be greater than 30mm. Handcart room (only for center cabinet) Handcart is made of cold-rolled steel plate after welding. The handcart shall be provided with "working" and "test" positions, and each position setting mechanism. The transmission mechanism of the handcart should make the handcart flexible and light when pushing and pulling. Similar handcarts should have good interchangeability. When the handcart is withdrawn or tested, an isolation baffle shall be used to isolate the static contact once, and it will open automatically when entering the working position.

High Voltage Switch Cabinet

High Voltage Switch Cabinet

There are many classification methods for switchgear. For example, they can be divided into removable switchgear and fixed switchgear through the installation of circuit breakers; or according to the structure of the cabinet, they can be divided into open switchgear, metal-enclosed switchgear, and metal Closed armored switchgear; according to different voltage levels, it can be divided into high-voltage switchgear, medium-voltage switchgear and low-voltage switchgear. It is mainly suitable for various occasions such as power plants, substations, petrochemicals, metallurgical steel rolling, light industrial textiles, factories and mining enterprises and residential quarters, and high-rise buildings.

High voltage switch cabinets must be safe when in use. For example, some models of AC contactors could not be operated because the contactor closing coils burned out shortly after the distribution box was put into operation. Failure caused by improper selection of electrical appliances in the distribution box. Due to improper selection of AC contactor capacity during manufacturing, install AC contactors of the same capacity for different outgoing circuits, without taking into account the imbalance of three-phase loads. It can increase the current level selection of part of the contactors based on the normal selection of the model, thus causing the AC contactor to burn out during high-temperature summer operation.

High-voltage switches such as high-voltage load switches, High Voltage Circuit Breakers, and high-voltage grounding switches are often installed in high- and low-voltage switch cabinets. Now China's high-voltage switch cabinets are developing in an intelligent direction. At present, some manufacturers of high-voltage switchgear have added overcurrent relays, current transformers for detection, and various sensors to the original vacuum circuit breaker, so that the circuit breaker has a self-diagnostic function and a transmission function. The control and protection are integrated into an intelligent unit, which strengthens the function of the circuit breaker and improves reliability. However, while the electrical components are intelligent, the high-voltage switchgear is also continuously advancing toward intelligence.

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