继电保护装置的一种新型评估方法

保护装置寿命的评估可为二次设备状态检修及变电站规划提供重要的决策依据,提高企业的竞争优势。以全生命周期管理为理论依据,提出了一种新型保护装置评估模型。首先引入健康指数的概念计算出装置的实际故障率,采用Weibull分布函数拟合出装置的故障率曲线;其次分析其其他要素,包括装置投资、运行维护、退役处置、检修和故障风险,以日平均消耗最低为判据建立了更为贴近实际运行情况的寿命评估模型。最后以某110 k V变电站保护装置作为实际算例,所得出的最佳退出运行时间与与厂家给出的役龄相比较为提前,考虑到实际运行环境及故障因素,预测结果较为合理,对保护等二次设备的状态检修策略制定及变电站规划改造具有实际意义。

A New Evaluation Method for Relay Protection Device

The evaluation of the economic life of the protection device can provide important decision basis for the secondary equipment condition maintenance and substation planning,which also can improve the competitive advantage of enterprises.Based on the theory of life cycle management,a new economic life evaluation model of protection device is proposed in this paper.Firstly,the concept of health index is introduced to calculate the actual failure rate of the device.The Weibull distribution function is used to fit the failure rate curve of the device.Secondly,it analyzes the other important factors,including the cost of the installation,the operation and maintenance,the decommissioning,the repair and failure risks.The life evaluation model is established with the daily average consumption as the criterion.Finally,taking an 110 kV substation protection device as a practical example,the optimal exit time is beforehand compared with that given by the factory.Considering the actual operating environment and the fault factors,the prediction result is reasonable,which also can be meaningful to the maintenance strategy of the secondary equipment and the planning of the substation.