High voltage circuit breaker is the key equipment of substation. It is of great significance to evaluate the operation state of circuit breaker comprehensively and accurately to ensure the reliable operation of power grid. Based on the idea of variable weight

a fuzzy comprehensive evaluation method for circuit breaker state evaluation is presented in this paper. In this paper

the comprehensive state evaluation indexes are given

each index quantity is normalized

the variable weight coefficient of each state quantity is calculated

furthermore the fuzzy correlation between the indexes is given. The balance of multiple factors is considered

and an accurate comprehensive evaluation system of circuit breaker reflecting the actual operation demand is established. Based on expert experience and condition evaluation guidelines

the status of circuit breaker is divided

and finally the comprehensive condition evaluation results of circuit breaker are given. Finally

the practical analysis of a circuit breaker in a substation in Jiangsu Province show that the comprehensive evaluation method proposed in this paper has high accuracy and adaptability.