基于根本原因法的数字化变电站故障诊断

A Root Cause Analysis Based Fault Diagnosis Approach for Digital Substations

根据数字化变电站的结构与特征及数据和信息流等的技术特点,引入根本原因分析(RCA)法,构建了基于原因型鱼骨图的数字化变电站输变电设备故障诊断模型。根据所建立的故障诊断模型中的父节点、变压器/断路器/输电线路等子节点及子原因、根原因之间的逻辑关系,采用Dempster-Shafer(D-S)证据理论中的合成法则融合多种故障特征信息,对输变电设备进行了层次化和结构化的综合诊断。通过对实际系统所发生的故障案例测试表明,所提出的故障诊断模型能够处理保护和断路器拒动和误动及警报信息出现遗漏和错误等情况。

With regard to the technical features of digital substations,such as the structure,data and information flows,a root cause analysis（RCA） based approach is presented to build the fault diagnosis model for digital substations with the fishbone diagram employed.Based on the logic relationship between the parent node and child node such as the transformer/circuit breaker/transmission line,as well as that between the child cause and root cause in the diagnosis model,the well-developed Dempster-Shafer（D-S） evidence theory is used to integrate different kinds of fault information so as to implement a hierarchical and structured comprehensive diagnosis.An actual fault scenario is served for demonstrating the developed approach for the fault diagnosis problem in digital substations with malfunctions of protective relays and/or circuit breakers,as well as missing and false alarms.