高电压技术2017，Vol.43Issue(11)：3800-3808,9.DOI:10.13336/j.1003-6520.hve.20171031041
组合空气间隙放电路径选择性试验
Experiment on Selectivity of Discharge Path of Combined Air Gap
摘要
Abstract
In order to investigate the dispersion and statistic property of the air gap discharge path,we researched the properties of breakdown voltage of rod-rod gap and rod-double rod gap,the properties of discharge paths selectivity,and the properties of the statistic property of discharge paths.The effect of the rod tip shape and the location of lower electrode was considered in the test.The finite element method was employed to calculate the static electric field of the gaps to analyze the test results.Both the effect of electric field uniformity coefficient on 50％ breakdown voltage and the effect of electric field intensity of rod tip on the selectivity of the discharge path were analyzed.The initial discharge inception angle θ of electrode surface was calculated to characterize the discharge statistic properties of high-voltage rod electrode by using image processing technology.Experiment and simulation results indicate that when the gap distance is 0.4～1.2 m,the greater the uniformity coefficient of gap electric field is,the lower the 50％ breakdown voltage of gap will be.With the same gap distance,the greater the radius of curvature of rod tip is,the greater the electric field will be.So the streamer more easily occurs and the probability of being hit is greater.Gap distance affects the striking selectivity of discharge path.When the lower rods have the same tip shape,the shorter the gap distance is,the greater the electric field around the rod tip will be.So the streamer more easily occurs and the probability of being hit is greater.The increasing of air gap distance can result in the weakening of attraction of grounded electrode to the initial discharge development of high voltage electrode rod,and it can enhance the randomness of inception direction of downward streamer on the surface of high voltage electrode rod.关键词
50％放电电压/放电路径选择性/电场强度/电场不均匀系数/放电初始发展角Key words
50％ discharge voltage/selectivity of discharge path/electric field intensity/the non-uniform coefficient of electric field/angle of discharge path initiation引用本文复制引用
王万昆,蓝磊,安韵竹,王羽,文习山,鄂盛龙..组合空气间隙放电路径选择性试验[J].高电压技术,2017,43(11):3800-3808,9.基金项目
中国博士后科学基金项目(2014M560624). Project supported by China Postdoctoral Science Foundation (2014M560624). （2014M560624）
