摘要
为研究大气压下氮气火花开关的纳秒脉冲击穿过程,采用粒子模拟方法对间隙放电过程进行模拟,获得流注形成发展过程的瞬态物理图像,并对比分析了脉冲前沿对间隙放电过程的影响。模拟结果表明:氮气火花开关的纳秒脉冲击穿过程主要包括两个阶段:流注形成阶段和流注快速发展阶段;流注快速传播阶段流注头部会产生逃逸电子,且光电离反应会导致流注通道形成分叉;流注快速传播阶段的放电通道平均传播速度高于流注形成阶段;脉冲前沿越大,流注传播速度越小,流注形成的临界电压越低,流注贯穿间隙的时延越长,与实验结果一致。
To study the nanosecond pulsed breakdown process of nitrogen spark switch at atmospheric pressure,the discharge process in the gap is simulated using the particle-in-cell method and the transient physical images of the formation and propagation process of the streamer are obtained.The effect of the pulse voltage rise time on the discharge processes in the gap are comparatively analyzed.The results obtained are as follows.Firstly,the nanosecond pulsed breakdown process of the switch includes the formation and fast propagation of the streamer.Secondly,runaway electrons may be generated in the streamer head and the branches of the streamer channel may be formed due to the photoionization during the fast propagation stage of the streamer.Thirdly,the average propagation velocity of the streamer channel during the streamer fast propagation stage is larger than that during the streamer formation stage.Finally,for the increasing rise time of pulse voltage,the propagation velocity of streamer becomes smaller,the breakdown voltage becomes lower,and the breakdown time delay of the switch becomes longer,which is consistent with the measurement results.
作者
夏小飞
刘磊
俸波
范才进
韩方源
厉天威
XIA Xiaofei;LIU Lei;FENG Bo;FAN Caijin;HAN Fangyuan;LI Tianwei(Guangxi Key Laboratory of Intelligent Control and operation and Maintenance of Power Equipment,Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530023,China;State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China)
出处
《南方电网技术》
CSCD
北大核心
2024年第9期31-37,68,共8页
Southern Power System Technology
基金
国家自然科学基金资助项目(12275222)
中国南方电网有限责任公司科技项目(GXKJXM20210264)。
关键词
氮气火花开关
纳秒脉冲击穿
粒子模拟
nitrogen spark switch
nanosecond pulsed breakdown
particle-in-cell
