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对电站保护装置可靠性指标体系引用拓扑理论进行了概要分析，其中针对平均寿命值的弊端提出了平均寿命当时值的概念及算法。
This paper gives a summary analysis of the topological theory of reliability index system of power station protection device, in which the concept and algorithm of the average life expectancy value is proposed according to the shortcoming of average life value.