Investigation on the defect data of circuit breaker above 110kV

Recently, Operation and Asset Management Department pays more and more attention to the accumulation and analysis of operation data. To support the OAMD with decision making and lead the asset management transit from “experience dependence” to “data support”, this paper analyzes the defect data of circuit-breaker with voltage level above 110kV from the perspective of voltage level, operation department, manufacturer, service time, mechanism type. Through data visualization, the distribution of defect rate of circuit-breakers is obtained firstly. After that, the common defect types of different manufacturers are summarized and a statistical analysis of replaced components of circuit breaker has been made to provide assistance to the Operation and Asset Management Department on spare parts. In the end, a replacement strategy of circuit-breakers is studied and it is suggested that the most efficient scheme is to replace 1% of circuit breakers older than 17 years.