Discussion of Characteristics and Difficulties on Reliability Research of High-voltage SF_6 Circuit-breaker

The high-voltage SF6 circuit breaker is an important equipment in the grid, which has an important impact on the reliability of the power grid operation. This paper focuses on the reliability of high-voltage SF6 circuit breakers, and discusses the objective of reliability analysis for the high-voltage SF6 circuit breakers and the current development of the reliability study. Based on the technical characteristics of the high-voltage SF6 circuit breakers,the features of the reliability study for high-voltage SF6 circuit breakers have been discussed in this paper. The main function of high voltage SF6 circuit breaker has been divided into six major functional modules as opening and closing, insulation, carrier, static structure, mechanism and drive, auxiliary and control circuit. At the mean time,the difficulties of the reliability study for each functional module has been analyzed. In the end the possible means and methods of the reliability evaluation for the sealing elements has been summed up.