Modification of streamer-to-leader transition model based on radial thermal expansion in the sphere-plane gap discharge at high altitude  

作　　者：耿江海 林果 王平 丁玉剑 丁杨 俞华 Jianghai GENG;Guo LIN;Ping WANG;Yujian DING;Yang DING;Hua YU(Department of Electric Power Engineering,North China Electric Power University,Baoding 071003,People’s Republic of China;China Electric Power Research Institute,Beijing 100192,People’s Republic of China;Xinjiang Electric Power Company Research Institute,Urumchi 830000,People’s Republic of China;Shanxi Electric Power Company Research Institute,Taiyuan 030001,People’s Republic of China)

机构地区：[1]Department of Electric Power Engineering,North China Electric Power University,Baoding 071003,People’s Republic of China [2]China Electric Power Research Institute,Beijing 100192,People’s Republic of China [3]Xinjiang Electric Power Company Research Institute,Urumchi 830000,People’s Republic of China [4]Shanxi Electric Power Company Research Institute,Taiyuan 030001,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第1期42-49,共8页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Scientific Funds for Young Scientists)(No.52007064)。

摘　　要：Historically,streamer-to-leader transition studies mainly focused on the rod-plane gap and low altitude analysis,with limited attention paid to the sphere-plane gap at high altitude analysis.In this work,sphere-plane gap discharge tests were carried out under the gap distance of 5 m at the Qinghai Ultra High Voltage(UHV)test base at an altitude of 2200 m.The experiments measured the physical parameters such as the discharge current,electric field intensity and instantaneous optical power.The duration of the dark period and the critical charge of streamer-toleader transition were obtained at high altitude.Based on radial thermal expansion of the streamer stem,we established a modified streamer-to-leader transition model of the sphere-plane gap discharge at high altitude,and calculated the stem temperature,stem radii and the duration of streamer-to-leader transition.Compared with the measured duration of sphere-plane electrode discharge at an altitude of 2200 m,the error rate of the modified model was 0.94%,while the classical model was 6.97%,demonstrating the effectiveness of the modified model.From the comparisons and analysis,several suggestions are proposed to improve the numerical model for further quantitative investigations of the leader inception.

关 键 词：streamer-to-leader transition model high altitude streamer stem convective diffusion radial thermal expansion 

分 类 号：TM855[电气工程—高电压与绝缘技术]