Status Assessment of Aging Condition of Transformer Oil-paper Insulation Based on Time Domain Dielectric Spectroscopy and Wavelet Analysis

WU Guangning; XIA Guoqiang; SONG Zhenjie; GAO Tianshan; GAO Bo

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Status Assessment of Aging Condition of Transformer Oil-paper Insulation Based on Time Domain Dielectric Spectroscopy and Wavelet Analysis

更新时间：2025-12-08

- Status Assessment of Aging Condition of Transformer Oil-paper Insulation Based on Time Domain Dielectric Spectroscopy and Wavelet Analysis
- Vol. 44, Issue 1, Pages: 226-233(2018)
- 作者机构：
  
  西南交通大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 January 2018，
  
  Published：2018
- 稿件说明：
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WU Guangning, XIA Guoqiang, SONG Zhenjie, et al. Status Assessment of Aging Condition of Transformer Oil-paper Insulation Based on Time Domain Dielectric Spectroscopy and Wavelet Analysis[J]. 2018, 44(1): 226-233.
DOI：

WU Guangning, XIA Guoqiang, SONG Zhenjie, et al. Status Assessment of Aging Condition of Transformer Oil-paper Insulation Based on Time Domain Dielectric Spectroscopy and Wavelet Analysis[J]. 2018, 44(1): 226-233. DOI：

摘要

为了研究变压器油纸绝缘老化特性

从而为变压器寿命评估作出指导

在实验室进行加速热老化实验

利用时域介电谱图对不同老化时间油纸试样的极化/去极化电流开展研究

结合小波分析理论对时域介电谱提出改进算法

并提取表征油纸各部分老化时间的特征量。结果表明:二次微分时域介电谱可以反映油纸绝缘的整体极化强度

测量时间1 000 s后介电谱出现峰值

且峰值随着老化时间的增加而增大;小波改进算法处理后的时域介电谱图的不同谱峰对应油纸绝缘3种主要极化类型

分别为油、油纸界面和绝缘纸内部极化;改进时域介电谱的不同峰值和峰值时间表征不同极化过程的强度和响应速度

且不同峰值与油、纸和油纸界面具有拟合优度很高的指数关系

可以考虑将改进时域介电谱不同谱峰作为表征油纸不同部分的老化特征量。

Abstract

In order to study the aging characteristics of oil-paper insulation

we prepared oil-paper samples at different aging time and studied the time-domain spectroscopy of samples by the polarization/depolarization current method.Moreover

we proposed an algorithm for improving time-domain spectroscopy based on wavelet transform theory.Then

the aging characteristic parameters of oil-paper insulation were extracted from the improved time-domain spectroscopy.Results show that time-domain spectroscopy can reflect the overall polarization of oil-paper insulation

and the spectrum peak will appear when measurement time exceeds 1 000 s.Then

after wavelet algorithm processing

the time domain dielectric spectrum can reflect three main polarization processes of oil-paper insulation（oil

paper and interface of oil-paper）.Peaks’ values and times of improved time-domain spectroscopy correspond to the intensity and responding speed of different polarization processes

respectively.Finally

the values of spectrum peaks have a good exponential relationship with aging times of oil-paper insulation which can be used as an aging characteristic parameters of different parts of oil-paper insulation.

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