脉冲电应力下空气-聚酰亚胺绝缘沿面放电过程数值模拟

doi:10.19595/j.cnki.1000-6753.tces.190289

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Abstract Surface discharge is one of the main reasons for the failure of the gas-solid insulation system of high-frequency power transformers. In order to investigate the evolution process of surface discharge, a simplified but effective set of reactions was used to describe all the particle reactions in air discharges. On this basis, a numerical model for discharge along air-polyimide surface was proposed with fluid dynamic theory, in which the transport equations of different particles, Poisson equation and plasma chemistry reactions in the discharge gap or channel were involved, along with the reaction process and accumulation of the charged particles on the dielectric surface. Then, the surface discharge evolution under the needle-to-bar electrode with 1cm gap was investigated by simulations. Distribution and variation of particle density, surface charge density and electric field versus discharge time were obtained. The reliability of the model was verified by experiments from the aspects of discharge development morphology and surface charge accumulation. Accordingly, the influence of temperature, gas pressure and secondary electron emission on surface discharge was also studied and revealed. The results indicate that the discharge propagation velocity is positively correlated with temperature, and negatively correlated with air pressure. The larger the secondary electron emission coefficient, the faster the discharge develops and the more the surface charge accumulates.

Key words： Surface discharge fluid model plasma charge density electric field distribution discharge propagation velocity

Received: 19 March 2019 Published: 12 May 2020

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TM433

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	Dong Guojing
	Liu Tao
	Li Qingmin

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Dong Guojing,Liu Tao,Li Qingmin. Numerical Simulation for Surface Discharge of Air-Polyimide Insulation under Pulsed Electrical Stress[J]. Transactions of China Electrotechnical Society, 2020, 35(9): 2006-2019.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190289 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I9/2006

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