电工技术学报  2022, Vol. 37 Issue (9): 2355-2365    DOI: 10.19595/j.cnki.1000-6753.tces.210416
高电压与放电 |
基于时频域介电响应的绝缘油弛豫过程分析
徐晴川, 王圣康, 林福昌, 李化
强电磁工程与新技术国家重点实验室 脉冲功率技术教育部重点实验室(华中科技大学)华中科技大学电气与电子工程学院 武汉 430074
Analysis of Relaxation Process of Insulating Oil Based on Dielectric Response in Time and Frequency Domain
Xu Qingchuan, Wang Shengkang, Lin Fuchang, Li Hua
State Key Laboratory of Advanced Electromagnetic Engineering and Technology Key Laboratory of Pulsed Power Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
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摘要 该文测量并分析了不同水分和老化程度绝缘油的时频域介电响应,通过频域介电谱分析绝缘油弛豫时间较小的弛豫过程,通过极化电流分析绝缘油弛豫时间较大的弛豫过程和直流电导过程,并研究水分含量和老化程度对弛豫过程特征参数的影响。研究表明,绝缘油频域介电谱可以分为直流电导频段、弛豫极化频段和高频极化频段三个频段。直流电导频段和高频极化频段的实部恒定,虚部与频率成反比,表现为电阻特性。但两个频段的损耗机制不同,前者以电导损耗为主,由直流电导率决定;后者以极化损耗为主,由高频电导率决定。绝缘油的水分含量对直流电导率影响较大,老化程度对高频电导率影响较大。绝缘油频谱在弛豫极化频段的实部和虚部斜率随频率发生变化,表现为明显的弛豫过程。水分含量会减小绝缘油的弛豫时间,老化程度对弛豫时间影响较小。
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徐晴川
王圣康
林福昌
李化
关键词 绝缘油弛豫过程频域介电谱极化电流电导损耗极化损耗    
Abstract:The dielectric response in time and frequency domain of insulation oil with different water content and aging status is measured and analyzed in this paper. Analyze the relaxation process of insulating oil with shorter relaxation time based on the frequency domain dielectric spectroscopy. Analyze the relaxation process of insulating oil with longer relaxation time and DC conductance process based on the polarization current. And analyze the influence on relaxation process parameters by different water moisture and aging status. As the research shows, there are three characteristic frequency band of insulating oil: DC conductance band, relaxation polarization band and high frequency polarization band. The real part of frequency spectrum at DC conductance band and high frequency polarization band is constant, and the imaginary part is inversely proportional to the frequency, which shows the resistance characteristic. However, the insulation loss of DC conductance band is dominated by conductance loss, and is decided by DC conductivity. The insulation loss of high frequency polarization band is dominated by polarization loss, and is decided by high frequency conductivity. Moisture content has greater impact on DC conductivity of insulating oil. Aging status has greater impact on high frequency conductivity of insulating oil. The real and the gradient of imaginary part of relaxation polarization band change with frequency, which shows the typical relaxation characteristics. Moisture content reduces the relaxation time and shifts the relaxation polarization band to higher frequency. Aging status has less impact on the relaxation time of insulating oil.
Key wordsInsulating oil    relaxation process    frequency domain dielectric spectroscopy    polarization current    conductance loss    polarization loss   
收稿日期: 2021-03-26     
PACS: TM855  
通讯作者: 林福昌 男,1969年生,教授,博士生导师,研究方向为高电压与绝缘技术和脉冲功率技术。E-mail:fclin@mail.hust.edu.cn   
作者简介: 徐晴川 男,1995年生,博士研究生,研究方向为变压器油纸绝缘检测。E-mail:xqc@hust.edu.cn
引用本文:   
徐晴川, 王圣康, 林福昌, 李化. 基于时频域介电响应的绝缘油弛豫过程分析[J]. 电工技术学报, 2022, 37(9): 2355-2365. Xu Qingchuan, Wang Shengkang, Lin Fuchang, Li Hua. Analysis of Relaxation Process of Insulating Oil Based on Dielectric Response in Time and Frequency Domain. Transactions of China Electrotechnical Society, 2022, 37(9): 2355-2365.
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