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变压器油纸绝缘水分含量的频域介电特征参量及评估方法研究

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Keywords: 变压器,油纸绝缘,水分含量,频域介电特征参量,状态评估,主曲线

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Abstract:

为了更好地将频域介电谱技术(FDS)用于变压器油纸绝缘状态的无损诊断,本文对在实验室获得的不同水分含量的油纸绝缘样品分别在30℃及60℃下进行频域介电谱测量;在深入研究水分含量及测量温度对油纸绝缘复相对介电常数及介质损耗频域谱特性影响的基础上,提出采用不同频率点处tanδ值作为水分含量评估频域介电特征参量,并初步给出了特征参量与水分含量的定量拟合公式;引入“频温平移因子”以消除测量温度对油纸绝缘频域介电特性影响的方法。结果表明tanδ在10-1~102Hz范围内随水分含量增加明显增大;分别采用10-1Hz、100Hz、101Hz及102Hz频率点处tanδ值作为水分含量评估特征参量,并拟合得到可用于水分含量评估指数函数;引入“频温平移因子”绘制的主曲线可以消除测量温度对油纸绝缘频域介电特性的影响,以提高水分含量评估的准确度。

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