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ZHENG Dianchun(郑殿春), WANG Jia(王佳), CHEN Chuntian(陈春天), ZHAO Dawei(赵大伟), ZHANG Chunxi(张春喜), YANG Jiaxiang(杨嘉祥). Dynamic Characteristics of SF 6 -N 2 -CO 2 Gas Mixtures in DC Discharge Process[J]. Plasma Science and Technology, 2014, 16(9): 848-855. DOI: 10.1088/1009-0630/16/9/08
Citation: ZHENG Dianchun(郑殿春), WANG Jia(王佳), CHEN Chuntian(陈春天), ZHAO Dawei(赵大伟), ZHANG Chunxi(张春喜), YANG Jiaxiang(杨嘉祥). Dynamic Characteristics of SF 6 -N 2 -CO 2 Gas Mixtures in DC Discharge Process[J]. Plasma Science and Technology, 2014, 16(9): 848-855. DOI: 10.1088/1009-0630/16/9/08
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Dynamic Characteristics of SF 6 -N 2 -CO 2 Gas Mixtures in DC Discharge Process

  • Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China

Funds: supported by National Natural Science Foundation of China (No. 51077032)
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  • Received Date: July 14, 2013
    Graphical Abstract
    • Abstract
  • Dynamic characteristics of discharge particles are described within the framework of a two-dimensional photoionization-hydrodynamic numerical model for the discharge process of SF 6 -N 2 -CO 2 gas mixtures at atmospheric pressure, under a uniform DC applied field. The finite difference–flux corrected transport (FD-FCT) algorithm is used in the numerical implementation for improving the accuracy and efficiency. Then the tempo-spatial distributions of the gap–space electric field and electron velocity are calculated from the microscopic mechanism, and the dynamic behaviors of charged particles are obtained in detail. Meanwhile, the tempo–spatial critical point of the avalanche-to-streamer in this model is discovered, and several microscopic parameters are also investigated. The results showed that the entire gap discharge process can be divided into two phases of avalanche and streamer according to Raether-Meek criterion; the electron density within the discharge channel is lower compared to that of positive and negative ions; space charge effect is a dominant factor for the distortion of spatial electric field, making the discharge channel expand toward both electrodes faster; photoionization provides seed electrons for a secondary electron avalanche, promoting the formation and development speed of the streamer.
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    • References (33)
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