Method, device and equipment for evaluating electrical life of contact of mechanical direct-current circuit breaker

Abstract

The invention discloses a method, a device and equipment for evaluating the electrical life of a contact of a mechanical direct-current circuit breaker, and the method comprises the steps: calculating the arc energy of the mechanical direct-current circuit breaker during opening and closing each time, and then calculating the arc energy accumulated value of the mechanical direct-current circuit breaker; and calculating the residual electric life percentage of the mechanical direct-current circuit breaker by using the electric arc energy accumulated value and the electric arc energy threshold value of the mechanical direct-current circuit breaker, comparing the residual electric life percentage with a preset judgment value, and judging the damage condition of the vacuum arc-extinguishing chamber of the mechanical direct-current circuit breaker. According to the method, the ablation factor of the contact in the opening and closing process is considered, and the evaluation accuracy of the electrical life of the contact of the mechanical direct-current circuit breaker is improved.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers; in particular, it relates to a method, device and equipment for evaluating the electrical life of contacts of mechanical DC circuit breakers. Background technique [0002] DC circuit breaker is one of the most important power equipment in the power system, which can effectively suppress the fault current and ensure the safe and stable operation of the power grid. Therefore, the quality of the DC circuit breaker's operating status has an important impact on the safety and stability of the power system. At present, DC circuit breakers mainly include three forms: mechanical DC circuit breakers based on manual zero crossing, power semiconductor DC circuit breakers and hybrid DC circuit breakers. The mechanical DC circuit breaker based on manual zero crossing has the advantages of low cost and low loss, and is an important development direction of DC circuit breakers in the future. The main...

AI Technical Summary

Problems solved by technology

At present, there are relatively few methods for evaluating the electrical life of mechanical DC circuit breaker contacts, most of which are aimed at the evaluation of the electrical life of AC circuit breaker contacts, and only consider the wear of the contacts during the opening process of the circuit breaker.

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