Dynamic propagation velocity of a positive streamer in a 3 m air gap under lightning impulse voltage  

作　　者：李志伟 雷挺 苏宇 姚修远 杨冰雪 刘德龙 律方成 丁玉剑 Zhiwei LI;Ting LEI;Yu SU;Xiuyuan YAO;Bingxue YANG;Delong LIU;Fangcheng LV;Yujian DING(North China Electric Power University,Beijing 102206,People’s Republic of China;China Electric Power Research Institute,Beijing 100192,People’s Republic of China)

机构地区：[1]North China Electric Power University,Beijing 102206,People’s Republic of China [2]China Electric Power Research Institute,Beijing 100192,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第4期114-121,共8页等离子体科学和技术（英文版）

基　　金：supported by the Beijing Science Fund for Distinguished Young Scholars(No.JQ22009);National Natural Science Foundation of China(No.51977198)。

摘　　要：Streamers represent an important stage in the initiation of gap discharge. In this work, we used an eight-frame intensified charge-coupled device camera to capture the streamer development process when a lightning impulse voltage of 95%–100% U50% was applied in a 3 m rod–plate gap and the streamer velocity was analyzed. Analysis of the observations shows that streamer velocity can be defined by three stages: rapid velocity decline(stage 1), rapid velocity rise(stage 2)and slow velocity decline(stage 3). The effects of electrode shape, applied voltage and gap breakdown or withstanding on streamer velocity were analyzed. The electrode with a larger radius of curvature will result in a higher initial velocity, and a higher voltage amplitude will cause the streamer to propagate faster at stage 3. Gap withstanding or breakdown has no obvious effect on streamer velocity. In addition, the experimental results are compared with previous results and the statistical characteristics of the primary streamer discharge are discussed.

关 键 词：lightning impulse 3 m air gap development process streamer velocity 

分 类 号：O461.2[理学—电子物理学]