中文摘要：

针对我国供电企业的实际情况，将电力设备费用分为一次投资费用和运行维护费用两部分，建立了电力设备全寿命周期费用定量模型。针对一次投资费用的特点，建立了基于时间分摊的一次投资费用模型；针对运行维护费用长期发生的特点，建立了基于灰色关联度确定分布类型的运行维护费用模型。同时，将两个费用模型综合考虑，建立了供电企业电力设备全寿命周期费用模型，据此可计算电力设备全寿命周期最小费用和最佳使用寿命。最后，以某变电站综合自动化项目为例，验证了该模型的有效性。

英文摘要：

The life cycle cost is divided into the one-off investment cost and the operation-maintenance cost according to the actual situation of power supply enterprises in China, and the quantitative model on lift cycle cost of electrical equipment is proposed. According to the characteristics of one off investment cost, the one off investment cost model based on time-proportion is established. Similarly, the operation-maintenance cost model based on the grey relational analysis is established too. By comprehensive consideration of these two models,the life cycle cost can be achieved,and the method to calculate the minimum cost and the optimal service life is discussed. Finally,the effectiveness of this method is verified by analyzing the practical example of one integrated automation system of some substation.