With the introduction of reliability engineering, electrical power system reliability has become an important basis for decision-making in the power industry. Two operation cases of electrical power systems are considered in this article. When the system is in an ordinary way, the influence between two system components will affect the importance measure of one component. When some component is in maintenance, preventive maintenance for working components and corrective maintenance for failed components can be executed simultaneously to enhance electrical power system performance. In view of the above two cases, two importance measures are proposed to effectively guide the preventive maintenance, aiming to improve the system performance within a limited budget. Reliability analysis procedure and methods applied toward the two importance measures are then developed and illustrated with the analysis on a Dual Element Spot Network system with double power supplies and double loads. Finally, a strategy for preventive maintenance is proposed by ranking the importance of these components.

随着可靠性工程的引入，电力系统的可靠性已经成为电力行业决策的重要基础。本文考虑了电力系统的两种运行情况。当系统以常规方式运行时，两个系统组件之间的影响将影响一个组件的重要性度量。在维护某些组件时，可以同时执行对工作组件的预防性维护和对发生故障的组件的纠正性维护，以提高电力系统的性能。针对以上两种情况，提出了两种重要的措施来有效地指导预防性维护，以在有限的预算内提高系统性能。然后开发了针对这两个重要措施的可靠性分析程序和方法，并在双电源双负荷双元件点网系统上的分析中进行了说明。最后，通过对这些组件的重要性进行排名，提出了一种预防性维护策略。