An Improved Evaluation Method for Protection Characteristics of Circuit Breaker with Oil Dashpot

An improved evaluation method based on normal distribution for the protection characteristics of circuit breaker with oil dashpot is proposed. Firstly, the protection characteristic of circuit breaker with oil dashpot is measured by test method, the action time under different current and the protection characteristic curve of circuit breaker with oil dashpot are obtained. Secondly, taking the measured action time as evaluation index factors, taking the mean value of the standard action time as the optimal value of the evaluation index, setting evaluation set with five levels. Then the protection characteristics of circuit breaker with oil dashpot are evaluated through the fuzzy comprehensive evaluation method with normal distribution. Finally, comparing the evaluated value under normal distribution with the value under triangular distribution before, the result of the fuzzy normal distribution comprehensive evaluation method is closer to the actual situation. Through test verification, this evaluation method of the protection characteristics of circuit breaker with oil dashpot is feasible, and it provides a research method for the evaluation of the protection characteristics of other similar products.