不同形状金属尖端电晕电流触发阈值的分析  

Analysis of Corona Current Triggering Threshold for Different Shaped Metal Tips

作　　者：李祥超[1] 罗华 黎雪婷 LI Xiangchao;LUO Hua;LI Xueting(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,NanjingUniversity of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044

出　　处：《电瓷避雷器》2020年第3期13-20,共8页Insulators and Surge Arresters

基　　金：国家重点研发计划资助(编号:2017YFC1501505)。

摘　　要：针对不同形状金属尖端电晕电流触发阈值的问题,通过圆锥形尖端和椭球形尖端表面附近的电场分布的理论分析,采取实验模拟仿真的方式,得到尖端处电晕触发电场阈值的关系,试验结果得出:1)金属尖端电晕触发电压阈值随高度的增加而降低,高度对金属尖端处电晕触发电场阈值基本无影响,尖端处电场阈值为相对固定值;2)电晕电流幅值以及频率与尖端处曲率半径以及表面积之间的影响关系。3)尖端处电晕触发电场阈值为6.9382 kV/cm到8.2824 kV/cm之间。Through the theoretical analysis of the electric field distribution near the sharp tip and the surface of the ellipsoidal tip,a laboratory simulation,aiming at the problem of corona discharge at different shapes of current data acquired through an oscilloscope,and following conclusions have beenmade:1)The metal tip corona trigger voltage threshold decreases with height,and the height has no effect on the corona trigger electric field threshold at the metal tip.The electric field threshold at the tip is relatively fixed.2)The relationship between the value of corona current amplitude and the frequency and the radius of curvature at the tip and the surface area is obtained.3)The corona trigger electric field threshold at the tip is between 6.9382 kV/cm and 8.2824 kV/cm.

关 键 词：电晕放电 电场阈值 有限元 电晕电流 

分 类 号：TM85[电气工程—高电压与绝缘技术]