基于动-静极板的J型线夹短间隙气体放电仿真研究  

Gas Dischargeat Short Gap between Wire and J-Clamp: A Simulation Study

作　　者：吴勤斌 王学禹 罗日成[1] 肖宏峰 田迪凯 张宇飞 WU Qinbin;WANG Xueyu;LUO Richeng;XIAO Hongfeng;TIAN Dikai;ZHANG Yufei(School of Electric and Information Engineering,Changsha University of Science and Technology,Changsha 410004,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410004

出　　处：《真空科学与技术学报》2021年第1期80-88,共9页Chinese Journal of Vacuum Science and Technology

摘　　要：随着配网中大力开展10 kV线路带电作业,J型线夹被广泛用于断接火项目,然而导线-线夹间易形成短间隙气体放电。本文以J型线夹断接火作业为背景,建立二维动-静极板简化模型,采用有限元算法,利用动网格理论,仿真模拟了线夹闭合过程中导线与线夹间的短间隙气体放电现象,分析了首周期内最大电子密度随时间的变化情况,并对不同周期下,相同方向高电子密度区域(红区)转移过程进行了研究。仿真结果表明:同周期内火线正相位时电子密度最大值相比负相位时明显更大;红区在电压过零点前向另一极移动;随着周期推移,电压由正相位过零点时,红区消失时间及形成均是先滞后再提前,但两者时间差先递增后递减;由负相位过零点时,红区消失和形成时间先提前再延后,两者的时间差先变大后减小,以及正负极红区发展存在明显差异。研究结果揭示了J型线夹作业时导线-线夹间的短间隙气体放电发展规律。Argon discharge at the gap,between power-line and J-clamp in connecting live-wire,was empirically approximated,mathematically modeled,theoretically analyzed and numerically simulated in finite element method.The influence of the period and phase on the Max electron-density was investigated.The simulated results show that the period and phase have a major impact.Specifically,in the 1st-period,the Max e-density in positive phase is larger than that in negative phase,the high e-density(red) region moves to the other electrode before the voltage passes zero.As period-number increases,the red-region disappearance/appearance times change in a delay-ahead mode when positive voltage passes zero,and the time difference(Δt1) varies in an increase-decrease manner;in contrast,when negative voltage passes zero,an ahead-delay mode for the disappearance/appearance times and a decrease-increase manner for Δt2.We suggest the simulation be of technological interest in live operation of powerline.

关 键 词：配网 短间隙 气体放电 电子密度 

分 类 号：TM213[一般工业技术—材料科学与工程]