宋斌;刘志雄;李恩文;王国利;

• 1:武汉大学电气工程学院
• 2:特高压工程技术(昆明、广州)国家工程实验室

摘要(Abstract)：

三比值法是电力变压器进行潜伏性故障诊断的有效方法之一,但该方法存在缺码问题,并且对位于比值边界附近的数据易造成误判。在对大量溶解气体分析(dissolved gas analysis,DGA)数据整理分析的基础上,发现同种故障类型的数据之间,H2、CH4、C2H6、C2H4、C2H2这5种故障气体变化折线具有较强的相似性,即对同种故障的2条数据,从一条数据到另一条数,5种故障气体之间倾向于同时增加或者同时减小,而不同故障类型的数据之间,折线容易出现相反的变化,相似性差。以此规律为基础,对已有的斜率关联度进行分析探讨,对其所能刻画的斜率区间过窄的问题进行了改进,构建了负关联度计算方法,采用该方法定量分析故障气体折线的相似性,并进行故障诊断。该方法摒除了比值法的思想,保留了DGA的全部信息,能对变压器故障进行判断识别,在一定程度上克服了三比值法的缺码问题,以及在边界附近误判的问题。该方法为DGA分析提供了新的思路。实例验证了该方法的有效性。

关键词(KeyWords)： 溶解气体分析;三比值法;关联度;故障诊断

Abstract:

Keywords:

基金项目(Foundation): 特高压工程技术(昆明、广州)国家工程实验室开放基金资助(NEL 201412)~~

作者(Author): 宋斌;刘志雄;李恩文;王国利;

Email:

DOI: 10.13335/j.1000-3673.pst.2015.09.038

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