Circuit Breaker Replacement Strategy Based on the Substation Risk Assessment

Using statistical data of 427 circuit breakers gathered in past 10 years, Weibull probability distribution of contact resistance for breakers on both overhead and underground feeders is determined. Substations reliability is calculated using minimal path and minimal cuts method. With this methodology influence of CB’s condition on substations reliability can be observed by using real field data. In this paper influence of CB removal on substations reliability is presented, together with cost justification of such investment. Example of calculation will be shown on 35/10kV substation.

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