应用频域介电谱法的变压器油纸绝缘老化状态评估  

Aging Status Assessment of Power Transformer Oil-Paper Insulation by Frequency-Domain Dielectric Spectroscopy

作　　者：郝建[1] 廖瑞金[1] 杨丽君[1] 马志钦[1] 

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

出　　处：《电网技术》2011年第7期187-193,共7页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB-724505-1)~~

摘　　要：通过频域介电谱法(frequency domain dielectric spectroscopy,FDS)测试分别在110和130℃下老化不同程度的变压器油纸绝缘试品的相对介电常数(εr)和介质损耗因数(tanδ),提出利用油纸绝缘试品在特征频率处的εr、tanδ值评估油纸绝缘老化状态的新方法,建立油纸绝缘试品在特征频率处的εr、tanδ与绝缘纸老化状态的量化关系。结果表明FDS低频段对油纸绝缘老化状态反应敏感,不同老化程度油纸绝缘试品在特征频率处的εr和tanδ值与绝缘纸聚合度满足指数函数关系;研究成果为将FDS用于无损诊断变压器老化状态提供参考。The relative dielectric constant εr and dielectric dissipation factor tanδ of test specimens of power transformer oil-paper insulation with different degrees of aging under 110℃ and 130℃ are tested by frequency domain dielectric spectroscopy （FDS） respectively. A new method to assess the aging status of oil-paper insulation by values of εr and tandof oil-paper insulation test specimens at characteristic frequency is proposed, and the quantitative relation of ,εr and tand of oil-paper insulation test specimens at characteristic frequency with aging status of insulation paper is built. Test results show that at low frequency range the FDS is sensitive to aging status of insulation paper; the values of εr and tan6 of oil-paper insulation test specimens with different aging statuses at characteristic frequency to the polymerization degree of insulation paper present the relationship of exponential function. The research results are available for reference to apply FDS to noninvasive diagnosis of transformer insulation aging status.

关 键 词：相对介电常数 介质损耗因数 频域介电谱 油纸绝缘 特征频率 

分 类 号：TM855[电气工程—高电压与绝缘技术]