C4F7N/CO2混合气体中尖端缺陷的流注放电仿真研究

doi:10.19595/j.cnki.1000-6753.tces.190937

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Abstract In order to explore the generation mechanism and development process of streamer in new environment-friendly gas, and provide theoretical basis for optical detection and reliable diagnosis of partial discharge. This paper simulates a single flow injection of tip model in C₄F₇N/CO₂ mixed gas under DC voltage by COMSOL. The discharge process of the streamer expresses the generation and motion of electrons and ions through the continuity equation, and obtains the variation law of the electric field and the density distribution of the luminous flux during the development of the streamer. The simulation results show that when the streamer head is close to the cathode, the luminous flux will increase exponentially. Then the space charge will be redistributed quickly, the electrons at the cathode will enter the anode through the streamer channel, the plasma sheath of one stream will be destroyed, and the electric field inside the stream will rise. As the conductivity of the channel decreases, the charge redistribution ends and the secondary streamer begins to develop toward the cathode. Compared with the primary streamer, the electric field distribution and the luminous flux distribution in the streamer are more uniform and the propagation speed is relatively slow.

Key words： Partial discharge streamer discharge luminous flux environment-friendly gas (C₄F₇N/CO₂) secondary streamer

Received: 25 July 2019 Published: 17 January 2020

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TM851

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	Zang Yiming
	Qian Yong
	Liu Wei
	Song Hui
	Jiang Xiuchen

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Zang Yiming,Qian Yong,Liu Wei等. Simulation Study on Streamer of Tip Defects in C₄F₇N/CO₂ Mixed Gas[J]. Transactions of China Electrotechnical Society, 2020, 35(1): 34-42.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190937 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I1/34

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