基于站间信息的电子式互感器故障协同诊断方法  

A collaborative diagnosis method of electronic transformer fault based on the inter-substation information

作　　者：熊小伏[1] 杨雪东[1] 刘年[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力系统保护与控制》2012年第21期80-83,89,共5页Power System Protection and Control

基　　金：重庆大学输配电装备及系统安全与新技术国家重点实验室资助项目(2007DA10512709202)

摘　　要：针对数字化变电站中的电子式互感器输出信号难以区分电子式互感器共性故障和电网故障的问题,提出了一种基于变电站站间信息的电子式互感器故障协同诊断方法及其判据。利用小波变换提取电子式互感器故障及电网故障时输电线路两端的异常信号,采用逻辑变量的方法对其进行分析,提出电子式互感器故障诊断方案及诊断判据,并对影响判据的两种因素进行分析并提出解决办法。针对两种典型的电子式互感器故障,采用Matlab进行仿真诊断,验证了该方法能够快速准确的诊断出电子式互感器故障并能区分电子式互感器共性故障及电网故障。Aiming at the problem that the output signal of electronic transformer is difficult to distinguish grid fault from common failure of electronic transformer in digital substation, this paper presents a new collaborative diagnosis method and criteria based on the inter-substation information. When the electronic transformer fault or grid fault happens, wavelet transform is used to extract the abnormal signals of transmission line ends, and logic variable method is adopted to analyze them. The diagnostic scheme and criterion of electronic transformer fault is proposed. The two factors influencing the criterion are analyzed and corresponding solutions are proposed. Matlab is used to simulate two typical electronic transformer faults. The result verifies that this method can diagnose electronic transformer fault accurately and distinguish grid fault from common failure of electronic transformer.

关 键 词：协同诊断 共性故障 信号奇异点 模极大值 逻辑变量 

分 类 号：TM45[电气工程—电器]