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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摘要为了探究新型环保气体中流注的产生机理和发展过程,为局部放电的光学检测和可靠诊断提供理论基础,通过COMSOL仿真直流电压下C₄F₇N/CO₂混合气体中针板模型一次流注到二次流注的放电过程,将电子和离子的产生与运动通过连续性方程进行表示,获得流注发展过程中电场的变化规律和光通量的密度分布。仿真结果表明,当一次流注头部靠近阴极时,光通量将呈指数增长;随后空间电荷将迅速地重新分配,阴极处的电子将通过流注通道进入阳极,一次流注的等离子体鞘层被破坏,流注体内部的电场上升;随着通道的导电性降低,电荷重新分配结束,二次流注开始向阴极发展。二次流注与一次流注相比,流注体内的电场分布与光通量分布更加均匀,传播速度也相对较慢。

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关键词 ：局部放电, 流注放电, 光通量, 环保气体（C₄F₇N/CO₂）, 二次流注

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

收稿日期: 2019-07-25 出版日期: 2020-01-17

PACS:

TM851

基金资助:国家重点研发计划（2017YFB0902500）和国家电网有限公司总部科技项目（环保型管道输电关键技术）资助

通讯作者: 钱勇男,1977年生,副教授,研究方向为输变电设备状态监测与智能化。E-mail：qian_yong@sjtu. edu. cn

作者简介: 臧奕茗男,1996年生,博士,研究方向为电力设备局部放电状态监测和智能化。E-mail：zangyiming@sjtu. edu. cn

引用本文:

臧奕茗, 钱勇, 刘伟, 宋辉, 江秀臣. C₄F₇N/CO₂混合气体中尖端缺陷的流注放电仿真研究[J]. 电工技术学报, 2020, 35(1): 34-42. Zang Yiming, Qian Yong, Liu Wei, Song Hui, Jiang Xiuchen. Simulation Study on Streamer of Tip Defects in C₄F₇N/CO₂ Mixed Gas. Transactions of China Electrotechnical Society, 2020, 35(1): 34-42.

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