Evaluation of Oil-paper Insulation Moisture State Based on Improved Fractional Poynting-Thomson Model

被引：0
|
作者：
Zhang T. [1 ]
Zhang N. [1 ]
Jiang S. [2 ]
Han J. [2 ]
Du Z. [2 ]
机构：
[1] College of Electrical Engineering and New Energy, China Three Gorges University, Yichang
[2] Hubei Provincial Engineering Technology Research Center for Power Transmission Line, China Three Gorges University, Yichang
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Fractional element; Frequency domain spectroscopy; Improved fractional Poynting-Thomson model; Moisture state; Oil-paper insulation;
D O I：
10.13336/j.1003-6520.hve.20210124
中图分类号：
学科分类号：
摘要：
In order to quantitatively evaluate the moisture state of oil-paper insulation equipment, an improved fractional Poynting-Thomson (P-T) model considering DC conductivity is established based on the concept of fractional element. Five groups of oil-paper insulation samples with different moisture content were prepared, and the frequency domain spectroscopy of the damped samples was measured. The improved fractional P-T model and the improved Cole-Cole model were used to fit the dielectric spectroscopy. The relationship between different damped samples and the parameters of the improved fractional P-T model was analyzed, and the influence of the model parameters on the frequency domain spectroscopy was studied by simulation. Finally, an example was given to verify the accuracy of the evaluation method. It is found that the improved fractional P-T model has better fitting accuracy for the frequency domain spectroscopy of oil-paper samples with different moisture degrees. With the increase of water content of oil-paper samples, the model parameters εb and DC conductivity increase, while the parameters εa and relaxation time constant decrease gradually. The model parameters εa, εb and DC conductivity have a power-law relationship with the water content, and the relaxation time constant has a linear relationship with the water content, so it can quantitatively characterize the moisture state of oil-paper insulation equipment. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：829 / 838
页数：9
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