Switchgear vacuum circuit breaker life evaluation method

Abstract

The invention discloses a switchgear vacuum circuit breaker life evaluation method, and relates to a vacuum circuit breaker life evaluation method based on counting of a discharge amount of a circuit breaker during failure. According to the method, through counting discharge amount data of a vacuum circuit breaker of a certain model during discharge failure, a vacuum circuit breaker life evaluation model based on Weibull distribution is established, unknown parameters in a Weibull function are solved by use of a maximum likelihood function, iteration solving is performed on the maximum likelihood function by means of MATLAB, finally, a solution is substituted to the Weibull distribution, a life evaluation curve of the vacuum circuit breaker is obtained, and according to discharge amount monitoring information, the life of the vacuum circuit breaker is timely evaluated. Through performing statistics on the Weibull distribution function under a discharge amount, insulation state information of the circuit breaker can be timely reflected. The method is simple and effective, and can also timely reflect the operation state of the switchgear vacuum circuit breaker.

Description

technical field [0001] The invention relates to a method for evaluating and calculating the life of a circuit breaker, in particular to a method for evaluating the life of a vacuum circuit breaker based on a switchgear. Background technique [0002] The switchgear vacuum circuit breaker uses vacuum as the arc extinguishing and insulating medium. It has the characteristics of no pollution and environmental protection to the environment, and because of its compact structure, large breaking current, convenient maintenance and high reliability, it is used in medium and low voltage power distribution. The network has been widely used. According to the structure, the vacuum circuit breaker can be divided into: ① switch body; ② conductive and arc extinguishing parts; ③ operating mechanism; ④ control unit. The realization of the function of the vacuum circuit breaker depends on the effective cooperation of each component, so the overall reliability of the vacuum circuit breaker dep...

AI Technical Summary

Problems solved by technology

However, due to the impact of breaking large currents and overvoltages during long-term operation, the insulation performance of the switchgear vacuum circuit breaker begins to decline, and the stability of the circuit breaker decreases. When the insulation performance decreases to a certain level, it cannot be broken normally. , resulting in damage to the switchgear, causing huge economic losses to the power supply company and users

Therefore, it is urgent to carry out research on the life evaluation method of vacuum circuit breakers, so as to replace the equipment in time and avoid huge economic losses.

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