Nonlinear Dielectric Response Characteristics of Damp Oil-Impregnated Pressboard Insulation and Application of H-W Model in Time-Frequency Conversion
Deng Yingxin1, Yang Lijun1, Yan Feidong2, Qin Zhen1, Li Wei1
1. State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China; 2. Shandong Power Equipment Company Jinan 250000 China
Abstract：In order to improve the low-frequency data acquisition efficiency of frequency-domain dielectric spectrum (FDS) for oil-paper insulation, the measured insulation is usually equivalent to a linear system, and the extended Debye model or Fourier transform is used to convert the time-domain data to low-frequency dielectric spectrum. However, when oil-paper insulation exhibits nonlinearity, the existing time-frequency domain conversion methods will cause large errors. In this paper, the influence of moisture on the nonlinear characteristics of the insulation is studied, and the time-frequency domain conversion effects of the extended Debye model and Fourier transform are verified. The results show that moisture will cause the nonlinear characteristic of oil-paper insulation. The two formal methods cannot be equivalent to non-linear insulation, and the conversion results have errors. Thus, Hammerstein-Wiener equivalent mathematical model is proposed. The results show that the model can well characterize the nonlinear characteristics of the dielectric response of oil-paper insulation, and its time-frequency domain conversion results also have higher precision.
邓映鑫, 杨丽君, 燕飞东, 秦榛, 李威. 受潮油纸绝缘的非线性介电响应特性及H-W模型在时-频转换中的应用[J]. 电工技术学报, 2020, 35(21): 4609-4619.
Deng Yingxin, Yang Lijun, Yan Feidong, Qin Zhen, Li Wei. Nonlinear Dielectric Response Characteristics of Damp Oil-Impregnated Pressboard Insulation and Application of H-W Model in Time-Frequency Conversion. Transactions of China Electrotechnical Society, 2020, 35(21): 4609-4619.
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2020, Vol. 35 
