摘要
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^-1～10^2Hz范围内随水分含量增加明显增大；分别采用10^-1Hz、10^0Hz、10^1Hz及10^2Hz频率点处tan6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。
In order to better apply frequency-domain dielectric spectroscopy（FDS） in nondestructive diagnosis of transformer insulation status, the experiment of oil-paper insulation sample in different moisture contents were tested by FDS at 30℃ and 60℃. On the basis of further study of the influence of moisture content and test temperature on frequency-domain dielectric property of oil-paper insulation, the loss factors tanδ corresponding to different test frequency points were proposed as characteristics to assess moisture content, and the quantitative relationships between the characteristics and moisture content were initially proposed. The temperature impact on FDS results could be eliminated by introducing the ＂frequency temperature shift factor＂. It demonstrates that in the range of 10^-1Hz to 10^2Hz, tandsignificantly increases with the increases of moisture content. The loss factors tanδat 10^1Hz, 10^0Hz, 10^1Hz and 10^2Hz were utilized as characteristics to assess moisture content, and an exponential rule which could further be used for moisture content assessment was observed in the relation between the loss factors tan6 at different frequency points and moisture content. Using the master curve constructing by ＂frequency temperature shift factor＂ could eliminate the impact of test temperature on FDS results and improve accuracy of moisture content assessment.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第10期59-66,共8页
Transactions of China Electrotechnical Society
基金
国家创新研究群体基金(51021005)
国家自然科学基金(51277187)
中央高校基本科研业务费(CDJZR12110018)资助项目
关键词
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
Transformer, oil-paper insulation, moisture content, frequency-domain dielectric characteristic parameter, condition assessment, master curve
作者简介
杨丽君女，1980年生，博士，副教授，硕士生导师，从事电气设备绝缘在线监测与故障诊断研究。
齐超亮男，1989年生，硕士研究生，从事电气设备在线监测与绝缘诊断研究。
