电工材料介电谱中的电极极化特性与分析

doi:10.19595/j.cnki.1000-6753.tces.L90516

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Abstract Movable charged carriers can accumulate at the electrode-sample interface, generate space charge and give rise to the macroscopic electrode polarization during the dielectric property test. Electrode polarization is often mistaken for the intrinsic electric polarization, or masks the intrinsic electric polarization, resulting in a false performance recognition to electrical materials. Consequently, a clear insight into the electrode polarization is of great importance to further understand dielectric relaxation and analyze the electrical property of electrical materials. In this work, the theory analysis and circuit model were proposed to describe the electrode polarization, which can be experimentally validated by several electrical materials such as organic crosslinked polyethylene (XLPE), inorganic energy storage ceramics and liquid cable oil. It was found that electrode polarization generally occurred at low frequency below 1Hz, resulting from a high leaky conductivity of the sample. Electrode polarization can result in an additional capacitance to the sample, which causes a sharp increase of permittivity at low frequency. Low-frequency dielectric loss deviates from inversely proportional variation with frequency as well as the imaginary part of complex conductivity drops firstly and then increases with the test frequency reducing.

Key words： Dielectric property electrode polarization electrical materials dielectric relaxation

Received: 12 July 2020

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TM21

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	Hou Shuai
	Zhou Fusheng
	Zhao Xuetong
	Li Yupeng
	Nie Yongjie

Cite this article:

Hou Shuai,Zhou Fusheng,Zhao Xuetong等. Analysis and Characteristics of Electrode Polarization in Dielectric Spectroscopy of Electrical Materials[J]. Transactions of China Electrotechnical Society, 2021, 36(zk2): 430-437.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90516 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/Izk2/430

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