Abstract: For the development of domestic power industry, substation is always the most important component, because substation can properly handle all aspects of power transmission, so as to optimize the quality level of power transmission. From the detailed analysis, in the operation process of the substation, the circuit breaker is an important component that determines the operation quality of the substation, and we need to pay high attention to it. However, the problem that cannot be ignored is that the control circuit of the circuit breaker often has the problem of disconnection fault, which will affect the operation quality of the circuit breaker, so targeted countermeasures need to be taken to deal with it。