D-Distance Technique to Determine Failure Probability of Power Circuit Breaker

In this paper, a new D-distance factor is proposed to determine the failure probability and prioritize maintenance actions of power circuit breakers in high-voltage substations. The calculated by using condition index renovation breaker (HVCB). To facilitate effective decision-making on with simple method less computational effort, model incorporates weighting–scoring (WSM) analytical hierarchy process (AHP) various diagnostic methods for assessments as well operation requirements HVCBs assessments. Many significant parameters from testing, such insulation resistance, contact timing, SF6 gas measurements, leakage rate, visual inspection, etc., have been considered determination. addition these, other parameters, age breaker, interrupter mechanism, number fault current interruptions, actual load rated ratio, short interrupting ability, spare parts availability, expertise level, are also validate model, practical test data twenty 115 kV substations distribution utility Thailand were utilized tested. By analyzing requirement output, method, discussed HVCB experts adjust scores weights all criteria obtain most accurate reliable model. results show that technique measured risk matrix, which defined probability, can be used rank schedule urgent normal tasks. addition, probabilities matrix appropriate strategies each group. Finally, could help managers engineers manage planning effectively easily thousands grid, it further applied equipment both transmission systems activities according available costs human resources.