The operation of distribution system with the components in deteriorating\ncondition makes the system reliability worsen. It is important to find the solution\nfor balancing failure cost and maintenance benefits such as downtime\nand reliability. In this paper, time to replace the components in optimum\ncondition based on constant-interval replacement mode is investigated. The\noptimal replacement time is mainly depended on component�s reliability and\nthe cost ration of preventive replacement and failure replacement. In this paper,\nequipment inspection method and Weibull Analysis is applied to obtain\nthe accurate reliability estimation. Weibull Analysis is applied with constant-\ninterval replacement model to investigate the optimum replacement\ntime for each component considering the different cost ratios. According to\nthe quantitative results, the determination of the optimal replacement time\n(OPT) can minimize the total downtime and failure cost. Consequently, the\nreliability of the system is maximized and estimation also becomes more accurate\ndue to sufficient approach.
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