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
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.
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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2022, Vol. 37 
