沿绝缘介质表面的气体放电等离子体模型

发布时间：2018-01-11 00:25

本文关键词：沿绝缘介质表面的气体放电等离子体模型　出处：《中国电机工程学报》2017年09期 　论文类型：期刊论文

【摘要】：高压直流断路器的断口沿面绝缘性能失效已经成为阻碍直流开断技术发展的主要难点之一,而目前对沿面放电的动态发展规律和放电模型研究还很不完善。该文基于二维自洽流体模拟,建立了N_2/O_2等离子体沿面放电模型,考虑带电粒子的连续性方程和电子能量平衡方程,并耦合泊松方程求解。研究结果发现平板电极中放电由两端向中间发展,累积的表面电荷极性与外加电压一致。根据放电电流波形可判断沿面放电的发展阶段,其中电晕放电阶段电流幅值小且稳定,流注放电阶段电流有小幅波动,火花放电阶段出现电流激增。沿面放电发生在绝缘柱表面的薄层中,其中正、负空间电荷混合存在。并从沿面放电发展速度和表面电荷密度分布两方面验证了该等离子体模型的正确性。
[Abstract]:The failure of break-edge insulation performance of HVDC circuit breakers has become one of the main difficulties that hinder the development of DC breaking technology. At present, the research on the dynamic development law and discharge model of discharge along the surface is not perfect. Based on the two-dimensional self-consistent fluid simulation, a discharge model of N _ 2 / O _ 2 plasma along the surface is established. The continuity equation and electron energy balance equation of charged particles are considered, and the Poisson equation is coupled to solve the results. It is found that the discharge in the plate electrode develops from two ends to the middle. The polarity of the accumulated surface charge is consistent with the applied voltage. According to the discharge current waveform, the development stage of the surface discharge can be judged, in which the amplitude of the current in the corona discharge stage is small and stable, and the current in the streamer discharge phase has a small fluctuation. In the spark discharge stage, the current surge occurs. The discharge along the surface occurs in the thin layer on the surface of the insulating column, in which positive discharge occurs. The negative space charge mixing exists and the correctness of the plasma model is verified from two aspects: the development rate of discharge along the surface and the distribution of surface charge density.
【作者单位】：输变电装备及系统安全与新技术国家重点实验室(重庆大学);
【基金】：国家重点基础研究发展计划项目(973项目)(2015CB251003) 国家创新研究群体基金(51321063)~~
【分类号】：TM85
【正文快照】： 电粒子的连续性方程和电子能量平衡方程,并耦合泊松方程求解。研究结果发现平板电极中放电由两端向中间发展,累积的表面电荷极性与外加电压一致。根据放电电流波形可判断沿面放电的发展阶段,其中电晕放电阶段电流幅值小且稳定,流注放电阶段电流有小幅波动,火花放电阶段出现电

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