变压器油纸绝缘老化与水分含量评估频域介电特征量

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摘要

为区分水分以及老化状态对油纸绝缘频域介电响应的影响,更好地推动频域介电谱技术（FDS）应用于现场电力变压器绝缘状态的无损评估,首先在实验室制备了不同含水量、不同热老化状态的油纸绝缘样品,然后在深入分析老化和水分对频域介电响应影响规律的基础上,提出一种利用介质损耗因数tanδ 区分油纸绝缘水分和老化状态对频域介电响应影响的方法,并提取了能够量化绝缘纸水分含量及聚合度的频域介电特征量。研究结果表明：提取的油纸绝缘样品的频域介电特征量在10^-1~10Hz的频域范围内对水分反映灵敏,而老化仅仅在10^-3~10^-1Hz的测试频段内对该特征量的影响较大,该特征量在两频段范围内的最大值分别与绝缘纸水分含量、聚合度均存在拟合优度较高的指数函数关系。提取的特征量可进一步应用于变压器油纸绝缘状态的无损评估。

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	王有元
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	马志钦

关键词 ：电力变压器, 油纸绝缘, 老化状态, 水分含量, 特征参量, FDS, 介质损耗因数

Abstract：

In order to distinguish the influences of the two factors (moisture content and aging state) on the frequency domain dielectric response of oil-paper insulation samples and better apply frequency domain spectroscopy (FDS) to assess the insulation condition of on-site power transformer, oil-paper insulation samples with different moisture contents and aging states were first prepared in the laboratory, then on the basis of further study of the influences of the two factors, a new method which can distinguish the influences of moisture content and aging state by the dielectric loss factor tanδ is proposed. Moreover, new characteristic were extracted to respectively quantify these two factors. The research results show that the characteristic parameters are sensitive to the moisture content in 10^-1~10Hz, while only affected significantly by aging states in 10^-3~10^-1Hz. Meanwhile, the maximum values of characteristic parameters in above two frequency ranges have the obvious exponential relationship with the degree of polymerization (DP) and moisture content, respectively, which are used to assess the conditions of oil-paper insulation. The characteristic parameters extracted in this paper can be applied to realize the non-destructive condition diagnosis of oil-paper insulation of transformer.

Key words： Power transformer oil-paper insulation aging state moisture content characteristic parameters frequency domain spectroscopy dielectric loss factor

收稿日期: 2013-10-18 出版日期: 2015-11-30

PACS:

TM835

基金资助:

国家自然科学基金资助项目（51277187）

作者简介: 王有元男,1971年生,教授,博士生导师,研究方向为高电压与绝缘技术、电气设备绝缘在线智能监测和故障诊断技术等。高竣男,1989年生,博士研究生,研究方向为电气设备绝缘在线监测与故障诊断。

引用本文:

王有元, 高竣, 刘捷丰, 张镱议, 郝建, 马志钦. 变压器油纸绝缘老化与水分含量评估频域介电特征量[J]. 电工技术学报, 2015, 30(22): 215-221. Wang Youyuan, Gao Jun, Liu Jiefeng, Zhang Yiyi, Hao Jian, Ma Zhiqin. Aging and Moisture Evaluation Characteristic Parameters for Oil-Paper Insulation of Transformer Using Frequency Dielectric Spectroscopy. Transactions of China Electrotechnical Society, 2015, 30(22): 215-221.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I22/215

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