构造了元件故障向量、维修向量、故障频率序列和修复序列，并利用其运算描述了元件的工作、故障、维修和修复过程，从而计算出在事后维修方式和维修时间分布影响下的元件动态可靠性指标：故障频率，有效度。

With them the process of units work, failure, repair and renovation is described, sequentially the dynamic failure and availability of the units can be computed under the influence of the repair time.

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长期以来，继电保护设备的维修方式是按以定期性检验为主，事后维修为辅的原则而进行的。

For a long time, the maintenance mode of relay protection equipments is based on the principle of mainly periodical inspection, supplemented by break maintenance.

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早期的设备管理主要是设备故障维修，是一种被动的事后维修的设备管理方式。

The early equipment management, which is chiefly the breakdown maintenance, is a passive equipment management style.

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