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

doi:10.19595/j.cnki.1000-6753.tces.191398

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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.

Key words： Oil-paper insulation time-frequency domain conversion nonlinearity moisture H-W model

Received: 23 October 2019

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TM855

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	Deng Yingxin
	Yang Lijun
	Yan Feidong
	Qin Zhen
	Li Wei

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Deng Yingxin,Yang Lijun,Yan Feidong等. Nonlinear Dielectric Response Characteristics of Damp Oil-Impregnated Pressboard Insulation and Application of H-W Model in Time-Frequency Conversion[J]. Transactions of China Electrotechnical Society, 2020, 35(21): 4609-4619.

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