Prioritization approach for circuit breakers to equip with condition monitoring devices

摘要

Circuit Breakers (CBs) play an important role in ensuring the safe operation ofprotection systems. Condition Monitoring (CM) devices are widely implemented to extendlifetime, and to improve the maintenance quality. The present paper proposes a cost-basedprioritizationapproachforCBsinanetworkequippedwithCMdevices.Tothisend,amath-ematicalformulationisdevelopedforthecategorizationandmodelingofequipmentfailuresbased on their severity. This formulation quantifies the effect of the CM devices on the out-age rate of the equipment. The reliability parameters of the substations 400/132/20 KV,including the failure rate, λ, average repair time, r, average outage time, U, substations, intwo status of without CM and with CM of the CBs are calculated. These parameters arecalculated implementing a minimal cut-set method. The outage rate of equipment with andwithout the CM devices is used to determine the effect of the CM devices on the reliabilityofthenetwork.Finally,theprioritizationofsubstationstoinstalltheCMdevicesontheCBshas been investigated in terms of the Expected Energy Not Supplied (EENS) and costs ofCM. To verify the effectiveness and applicability of the method, the proposed approach isapplied to the CBs in the power transmission network in the Khorasan Regional ElectricityCompany (KREC) in Iran.