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电网技术  2011 

应用频域介电谱法的变压器油纸绝缘老化状态评估

, PP. 187-193

Keywords: 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

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Abstract:

通过频域介电谱法(frequencydomaindielectricspectroscopy,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(??r)和介质损耗因数(tan??),提出利用油纸绝缘试品在特征频率处的??r、tan??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???r、tan??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???r和tan??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。

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