Condition evaluation index system of distribution equipments

In this paper, the condition-based maintenance index system for distribution equipments made by State Grid is supplemented by adding the maintenance strategy evaluation indexes, which will be helpful for the maintenance staff to optimize the choice of maintenance strategies. A risk factor is introduced in the security and economy indexes for maintenance strategy evaluation by building function between the equipment failure rate and equipment health state. So the evaluation result of different maintenance strategy, especially for preventive maintenance and Breakdown Maintenance, will be great different, and thus the decision makers with different risk preference are assisted to make their choices. Besides, A service restoration optimization program is implemented during the evaluation, so the outage load caused by maintenance will be divided into two sets: one is the load can be restored with the outage time equals to the switch operation time; another is the load cannot be restored with the outage time equals to the maintenance time. This improvement will make the corresponding evaluation indexes more accurate and hence can distinguish the slight difference of different maintenance strategy. Mathematical analysis shows that the established indexes can be calculated and can provide richer information to assist decision makers, therefore the established index system is practical and effective.