To overcome the disadvantages of current operation and maintenance mode of integrated disconnecting circuit breakers

this paper proposes an operation and maintenance strategy based on risk assessment at three levels such as equipment

substation and grid. At the equipment level

the outage probability model for the integrated disconnecting circuit breakers is established by the health index theory

and the fault set is obtained. At the substation level

considering the connection form of the substation

a grid risk analysis model is formulated with the integrated disconnecting circuit breakers. At the grid level

the risks of all integrated disconnecting circuit breakers are assessed

and the risk tracking method is applied to determine the operation and maintenance order of each substation. According to the system risk of the whole operation and maintenance period

and combined the operation and maintenance costs

the operation and maintenance method of the integrated disconnecting circuit breakers is proposed to optimize the maintenance time and order of the integrated disconnecting circuit breakers in each substation. The analysis of example illustrates that

compared with current regular maintenance and condition-based maintenance

the proposed method satisfies maintenance requirements

and reduces the grid risk by 19.67% and 13.21%. The method achieves the refined operation and maintenance of the integrated disconnecting circuit breakers

and obtains better maintenance benefits.