Vacuum circuit breaker state evaluation method and system based on radiation electromagnetic wave detection

Abstract

The invention discloses a vacuum circuit breaker state evaluation method and system based on radiation electromagnetic wave detection. The method comprises the following steps: acquiring a radiation electromagnetic wave signal generated by a vacuum circuit breaker to be subjected to state evaluation in a switching-on and switching-off process; acquiring the pulse number or pulse decay time of the radiation electromagnetic wave signal; and comparing the acquired pulse number or pulse decay time with a preset pulse number threshold value or pulse decay time threshold value to complete state evaluation of the vacuum circuit breaker. The method achieves the evaluation of the internal state of the arc extinguish chamber of the vacuum circuit breaker based on the pulse number or pulse decay time of the radiation electromagnetic wave signal through an electrical detection means, and has the advantages of being visual, simple, rapid, efficient and the like.

Description

technical field [0001] The invention belongs to the technical field of defect detection of electrical equipment in power systems, relates to the field of vacuum circuit breaker state evaluation, and in particular to a vacuum circuit breaker state evaluation method and system based on radiation electromagnetic wave detection. Background technique [0002] The closing, breaking, protection, regulation and control of high-voltage lines in the power system are all realized by switching devices; The safety of lines and major equipment, so as to realize the safe operation of the power grid. [0003] Vacuum circuit breaker is a new type of switchgear developed in the past 20 to 30 years. It has been widely used in 10kV~35kV power distribution system, and its rated breaking current can reach 50kA~100kA; it uses vacuum as insulation and extinguishing Compared with other types of circuit breakers, arc medium has its own characteristics in operation, including: (1) suitable for freque...

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Problems solved by technology

[0005] Due to the complex structure of the vacuum circuit breaker itself, the indicators reflecting its operating status are complicated, and at the same time, the data of some indicators is scarce and the information is vague and incomplete. Therefore, the status evaluation has a lot of gray fuzzy, random and other factors, which leads to complex and inaccurate results. sex

Although scholars at home and abroad have done some research on the state evaluation of vacuum circuit breakers, and have successively proposed fuzzy-evidence theory, cloud matter-element analysis method, radar map method, gray fuzzy comprehensive evaluation method, gray correlation degree and approaching ideal solution, etc. , but the above methods either fail to comprehensively consider the gray fuzzy and random factors of the evaluation information, or mostly use a single-sided weighting method to determine the weight of multiple indicators, so it is difficult to objectively and accurately evaluate the overall operating status of the vacuum circuit breaker

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