Method and device for evaluating residual electrical life of circuit breaker based on charge quantity

The invention provides a circuit breaker residual electric life evaluation method and device based on charge quantity, and the method comprises the steps: determining the charge quantity passing through a breaking arcing period and a pre-breakdown arcing period in the consumed opening and closing times of a first circuit breaker, calculating the charge quantity passing through the first circuit breaker before the first breaking failure, and evaluating the residual electric life of a second circuit breaker. Wherein the electric charge quantity passing before the first breaking failure of the first circuit breaker provides an actual basis for the overall evaluation method, and the evaluation of the residual electrical life of the circuit breaker is realized by combining the electric charge quantity passing during the breaking arcing period and the pre-breakdown arcing period in the consumed opening and closing times of the first circuit breaker, so that the evaluation reliability is greatly improved. According