变压器油纸绝缘含水量定量评估的频域介电特征参量研究

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摘要水分是影响电力变压器油纸绝缘性能的一个重要因素。为了更好地将频域介电谱法（Frequency Domain Spectroscopy,FDS）应用于变压器油纸绝缘含水量的无损定量评估,从而对变压器的绝缘状态及剩余寿命进行可靠预测,本文在实验室内制备了不同水分含量的油纸绝缘样品,并在30℃及50℃下对样品进行频域介电谱测试;为了在有限的测量频段内尽可能获得复相对介电常数（ε^*_r）所携带的绝缘信息,本文在深入研究水分及温度对油纸绝缘ε^*_r影响规律的基础上,提出在特征频段内采用复相对介电常数的实部积分（S_RP）和虚部积分（S_IP）作为绝缘纸板水分含量评估的特征参量,并给出了特征参量与绝缘纸板水分含量的拟合关系。最后,引入了“FDS曲线频率平移法”以消除温度对油纸绝缘频域介电特性的影响。结果表明：S_RP在10^-3~10^-1Hz的特征频段内随绝缘纸板水分含量的增加而显著增大;而S_IP 在10^-1~10¹Hz特征频段内也存在类似规律,通过“FDS曲线频率平移法”绘制的ε^*_r主曲线可以消除温度对油纸绝缘频域介电特性的影响,从而提高绝缘纸板水分评估结果的可靠性。

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关键词 ：变压器, 油纸绝缘, 水分含量, 特征参量, 定量评估

Abstract：The insulating property of transformer oil-paper insulation is greatly influenced by moisture. In order to better apply frequency domain spectroscopy (FDS) to nondestructive quantitative assessment of moisture content in transformers, and reliably forecast its insulation state and remaining life, the oil-paper insulation samples with different moisture contents are first prepared, and then the frequency dielectric properties of these samples are tested at 30°C and 50°C. To obtain the insulation information contained in relative permittivity(ε^*_r), the integral of real part (S_RP) and the integral of imaginary part (S_IP) of relative permittivity in their respective frequency ranges are proposed as characteristic parameters for assessing the moisture content in cellulose insulation based on analysis about the influence of moisture and temperature on ε^*_r. The quantitative relationships between moisture content and characteristic parameters are initially presented. Finally, the impacts of temperature on FDS results are eliminated by introducing the “frequency shift of FDS”. Results show that in 10^-3~10^-1Hz, the S_RP obviously increases with the increasing of moisture content in pressboards, while S_IP present the similar tendency in 10^-1~10¹Hz. Master curve formed by “frequency shift of FDS” could eliminate the temperature effect on FDS and therefore improve the reliability of moisture content assessment.

Key words： Power transformer oil-paper insulation moisture content characteristic parameters quantitative assessment

收稿日期: 2013-09-05 出版日期: 2015-03-23

PACS:

TM855

基金资助:国家自然科学基金资助项目(51277187)

作者简介: 廖瑞金男,1963年生,教授,博士生导师,研究方向为电气设备绝缘在线监测与故障诊断。刘捷丰男,1985年生,博士研究生,研究方向为大型油浸式电力变压器绝缘状态评估与寿命预测。

引用本文:

廖瑞金, 刘捷丰, 吕彦冬, 杨丽君, 高竣. 变压器油纸绝缘含水量定量评估的频域介电特征参量研究[J]. 电工技术学报, 2015, 30(1): 204-211. Liao Ruijin, Liu Jiefeng, Lü Yandong, Yang Lijun, Gao Jun. Frequency Domain Dielectric Characteristic Parameters for Quantitative Assessment of Moisture Content of Oil-Paper Insulation in Power Transformers. Transactions of China Electrotechnical Society, 2015, 30(1): 204-211.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I1/204

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