In order to evaluate the energy-storing state of circuit breaker actuator’s breaking spring and closing spring（hereinafter referred to as spring）

the fuzzy comprehensive evaluation is applied to state assessment of high voltage（HV） circuit breaker’s spring. The factors set is established by selecting representative characteristic parameters which reflect the energy-storing state of breaker’s spring. The establishment of evaluation grades set is based on spring’s working condition. The evaluation weight set is established by using expert evaluation method and AHP（the analytic hierarchy process）. Fuzzy relationship between factors and evaluation grades is constructed

fuzzy operator and result processing method are set

so the whole evaluation model is completed and can be used to evaluate the state of circuit breaker’s spring. The practical calculation example of LW25-126 circuit breaker shows that the model can objectively and effectively assess the energy-storing state of HV circuit breaker’s spring.