Main circuit breaking method of circuit breaker and soft starting circuit breaker

Abstract

The invention relates to a main circuit breaking method of a circuit breaker and a soft starting circuit breaker. The soft starting circuit breaker comprises an incoming and outgoing line power connection bar, a breaking chamber, a support device and a control device and is characterized in that a static contact and a movable contact are arranged in the breaking chamber, each of the two contacts or one of the contacts comprises a main conductive post and a non-main conductive post, the main conductive post is used for bearing circuit voltage / current transmission operation after the circuit breaker is completely switched off, the non-main conductive post is half-wrapped by the main conductive post and protrudes out of a breaking surface of the main conductive post, the non-main conductive post is provided with an elastic or telescopic structure, a non-linear volt-ampere resistance material is arranged or generated on at least one position on the non-main conductive post, the non-main conductive post at least comprises a connection buffer post, the non-main conductive post is in contact with an opposite contact and then the main conductive post is in contact with the opposite contactwhen the movable contact and the static contact are nearly contacted and closed, and the main conductive post is separated from the opposite contact and then the non-main conductive post is separatedfrom the opposite contact during the separation process of the movable contact and the static contact.

Description

technical field [0001] The invention belongs to the field of electrical technology, and in particular relates to a breaking method for a main circuit of a circuit breaker and a soft-start circuit breaker thereof. Background technique [0002] The circuit breaker is an important switching device in the power system. In the operating grid, it is used to control the input and withdrawal of power lines or equipment, and to protect the normal operation of the lines. Among all grid operation accidents, accidents caused by high-voltage circuit breakers account for a considerable proportion in both the number of times and the power outage time caused by the accidents. [0003] Among the fault causes of high-voltage circuit breakers, the damage of the arc extinguishing chamber accounts for 90% of the main reasons. Arc extinguishing often leads to explosion accidents, which bring huge losses to people's property. [0004] In order to avoid these accidents, circuit breakers are becom...

AI Technical Summary

Problems solved by technology

[0003] Among the fault causes of high-voltage circuit breakers, the damage of the arc extinguishing chamber accounts for 90% of the main reasons. Arc extinguishing often leads to explosion accidents, causing huge losses to people’s property

[0004] In order to avoid these accidents, circuit breakers are becoming more and more complicated, and the cost of arc extinguishing is getting higher and higher, especially the generator outlet circuit breaker GCB, which breaks high voltage and high current, is equipped with contact wear detection system and air tightness detection system. , Infrared temperature detection system, voltage zero-crossing detection system, voltage equalization anti-reignition device, the cost of a single unit often exceeds one million yuan, and a new power plant alone invests more than ten million yuan, and requires major repairs and maintenance

[0005] The arc extinguishing methods of existing circuit breakers are mainly: using vacuum (pressure below 0.013Pa), sulfur hexafluoride (SF6) gas, dielectric arc extinguishing method of insulating oil, using gas or oil arc blowing method, and using slits to extinguish the arc. Arc extinguishing method, using multi-fracture arc extinguishing method, these arc extinguishing methods are either complicated in structure and easy to damage, or high in cost or imperfect in arc extinguishing. The purpose of the present invention is to provide a method and device with simple structure, low cost, and perfect arc extinguishing , to provide a comprehensive technical upgrade for all high-current and high-voltage switching equipment in the power system, and contribute to a more reliable, safe and stable operation of the power system

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