基于分形理论的SF<sub>6</sub>/N<sub>2</sub>混合气体放电仿真

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Abstract In this paper, the model of dielectric breakdown in SF₆/N₂ mixed gas is simulated by using the Matlab programs. This rod-plane model is established considering the distribution of space charge and introducing physical time, based on the fractal theory. The finite element method (FEM) is used to solve the electric field, and particle continuity equations are solved by the flux corrected transport (FCT) algorithm. Moreover, the characteristics of fractal discharge under various scenarios are analyzed, such as different probability exponents, different discharge thresholds, and different percentages of SF₆ and so on. The simulation results show that the number of branches and fractal dimension decrease with the increasing of probability exponent and the percentage of SF₆. The discharge fractal dimension D of 50%/50% SF₆/N₂ gas mixture equals to 1.219 2, and the average velocity during the discharge process of streamer propagation is 1.15Mm/s. Moreover, the distributions of charge density in space, electric field alone the axis, and electrons density alone the axis are calculated.

Key words： Discharge, fractal dimension, SF6/N2 mixed gas, finite element method, flux corrected transport, probability exponent

Received: 29 October 2015 Published: 03 January 2017

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TM213

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	Li Min
	Wang Feng
	Xu Songzhi
	Chen Xiaolin
	Huang Chizhi
	Xie Wangjun

Cite this article:

Li Min,Wang Feng,Xu Songzhi等. Simulation of Discharge in SF₆/N₂ Gas Mixtures Based on Fractal Theory[J]. Transactions of China Electrotechnical Society, 2016, 31(24): 88-95.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I24/88

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