Evaluation Method for Moisture Content and Aging Degree of Transformer Oil-paper Insulation Based on Frequency Dielectric Spectroscopy and Compensation Factor

WU Guangning; XIA Guoqiang; SU Mao; ZHU Hang; YANG Feibao; GAO Bo

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Evaluation Method for Moisture Content and Aging Degree of Transformer Oil-paper Insulation Based on Frequency Dielectric Spectroscopy and Compensation Factor

更新时间：2025-12-08

- Evaluation Method for Moisture Content and Aging Degree of Transformer Oil-paper Insulation Based on Frequency Dielectric Spectroscopy and Compensation Factor
- Vol. 45, Issue 3, Pages: 691-700(2019)
- 作者机构：
  
  1. 西南交通大学电气工程学院
  2. 南京南瑞继保电气有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：14 March 2019，
  
  Published：2019
- 稿件说明：
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WU Guangning, XIA Guoqiang, SU Mao, et al. Evaluation Method for Moisture Content and Aging Degree of Transformer Oil-paper Insulation Based on Frequency Dielectric Spectroscopy and Compensation Factor[J]. 2019, 45(3): 691-700.
DOI：

WU Guangning, XIA Guoqiang, SU Mao, et al. Evaluation Method for Moisture Content and Aging Degree of Transformer Oil-paper Insulation Based on Frequency Dielectric Spectroscopy and Compensation Factor[J]. 2019, 45(3): 691-700. DOI：

摘要

为了消除油纸绝缘老化程度和水分对频域介电谱（FDS）的相互影响

提高变压器油纸绝缘老化程度和水分含量评估的精度

研究了基于频域介电谱和补偿因子的评估方法。该方法首先采用频域介电谱方法对实验室制备的老化程度和含水量均不相同的多组油纸绝缘试样开展测试;然后根据测得的频谱曲线

提出了表征油纸绝缘含水量和老化程度的特征量

并首次引入了老化和水分补偿因子对特征量进行补偿;最后

基于补偿因子提出了一种新的油纸绝缘状态评估方法

并进行现场测试验证。实验结果表明:低频区（10-3～10-1 Hz）的曲线受到水分和老化的共同影响

高频区（101～103 Hz）的曲线在含水量较低时主要受水分的影响

而在含水量较高时老化在该频段的影响也十分明显;提出的特征量SDP和Sm分别与老化程度和含水量具有高度指数拟合优度关系

通过补偿因子可以反映并消除特征量中老化或水分的影响;用该方法评估现役变压器中油纸绝缘的水分含量和聚合度

均与实测值接近

初步验证了该方法的有效性。因此

论文提出的油纸绝缘水分含量和老化程度评估方法可为实际变压器状态评估提供一种有效的途径。

Abstract

In order to distinguish the influence of aging state and moisture on frequency domain spectroscopy（FDS） and improve accuracy of assessing aging state and moisture content of oil-paper insulation

we put forward an evaluation method based on frequency domain dielectric spectroscopy and compensation factor. In the proposed method the frequency domain dielectric spectroscopy method was firstly used to test sets of oil-paper insulation samples which were prepared in the laboratory with different degree of aging and water content. Then

based on the measured spectrum curves

the feature quantities of aging degree and moisture content were proposed

and the aging factor and moistore compensate factor were first introduced to compensate the influences of them respectively. Finally

a new method was proposed to evaluate the condition of oil-paper based on compensation factor

and field tests were carried out to verify the validity.The experimental results show that the FDS at the low frequency range（10-3～10-1 Hz） is affected by both water and aging; at the high frequency range（101～103 Hz） the FDS is mainly affected by moisture when the moisture content is on a low level; however

when the moisture content reaches a high level

the effect of aging degree on this band will become obvious. Sm and SDP are extracted as characteristic parameters of moisture content and aging degree

respectively

and compensation factors can reflect and eliminate the effects of aging or moisture in the feature. By employing this method to evaluate the moisture content and polymerization degree of active transformers

the results are similar to the measured values

and the effectiveness of the method is preliminarily verified. Therefore

the proposed method which is based on the compensation factor algorithm can provide an effective way for the status assessment of actual transformer.

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