高频正弦电应力下气-固绝缘沿面放电现象及特征分析

doi:10.19595/j.cnki.1000-6753.tces.L80636

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Abstract Surface discharge in gas-solid insulation is a common defect in high frequency transformer. In order to study the phenomenon and characteristics of gas-solid insulation surface discharge under highfrequency sinusoidal electrical stress, a needle-plateelectrode high frequency surface discharge experimental platform was established. The experiment was carried out by the constant sinusoidal voltage value, and the discharge development morphology, discharge characteristic parameters, discharge spectrum and surface damage of different stages were obtained. The results show that the surface discharge shows a strong polarity effect, the discharge times and discharge amplitude of positive half cycle are both greater than the negative half cycle. The development of polyimide surfacedischarge under highfrequency electrical stress passes through corona discharge-streamer discharge-flashover, no spark discharge phenomenon, and the damage of the film by surface flashover is much greater than the power frequency electrical stress. With the formation of protrusion and "crystalline solids" on the insulating surface, the electric field structure is distorted to affect the discharge development. As a result, the discharge amplitude, times and phase distribution present specific changes in different stages of discharge.

Key words： High frequency power transformer highfrequency sinusoidal electrical stress surface discharge surface topography discharge spectrum

Received: 06 July 2018 Published: 13 August 2019

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TM433

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	Zhang Kaifang
	Zhang Li
	Li Zongwei
	Zhao Tong
	Zou Liang

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Zhang Kaifang,Zhang Li,Li Zongwei等. Analysis of the Phenomena and Characteristics of Gas-Solid Insulation SurfaceDischarge under High Frequency Sinusoidal Electrical Stress[J]. Transactions of China Electrotechnical Society, 2019, 34(15): 3275-3284.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80636 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I15/3275

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