基于等效电路的油纸绝缘系统受潮状态分析

doi:10.19595/j.cnki.1000-6753.tces.191612

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Abstract Starting from the equivalent model of the dielectric response of oil-paper insulation — extended Debye model, the dielectric characteristic parameters are extracted by analyzing the variation patterns of the model parameters, so as to achieve the quantitative evaluation of the insulation dampness state. Firstly, oil-paper model bushings were used for the test with their condenser bodies absorbing different levels of moisture, and they were tested by frequency-domain dielectric spectroscopy (FDS) under different controlled temperatures. Using the obtained FDS spectrum and the combinational optimization algorithm GA-LMA, the branch parameters of the extended Debye model were identified. Then the characteristic parameters which characterize the moisture level of the oil-paper insulation system was proposed-the polarization resistance and the time constant of the branch that dominates the low-frequency properties of the model. Finally, the formulaic relationship between the above parameters and moisture content of insulation was established, which can be used to quantificationally determine the moisture content of oil-paper insulation.

Key words： Oil-paper insulation system frequency-domain dielectric spectroscopy extended Debye model moisture state characteristic parameters

Received: 22 November 2019

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TM855

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	Yang Feng
	Tang Chao
	Zhou Qu
	Du Lin
	Ran Liman

Cite this article:

Yang Feng,Tang Chao,Zhou Qu等. Analyzing the Moisture State of Oil-Paper Insulation System Using an Equivalent Circuital Model[J]. Transactions of China Electrotechnical Society, 2020, 35(21): 4586-4596.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191612 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I21/4586

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