低气压下工频放电等离子体发展特性研究  

Experimental Simulation of Development of AC Discharge Plasma Channel at Low Atmospheric Pressure

作　　者：杨亚奇[1] 李卫国[1] 袁创业 夏喻[1] 陈艳[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《真空科学与技术学报》2017年第3期281-285,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(51277063)

摘　　要：为研究低气压下棒-板长间隙工频放电等离子体通道发展过程及外部特征,本研究提出利用自行研制的以聚丙烯为主体的低气压放电腔进行工频放电试验,并分析了800 mm棒-板间隙在100 Pa,200 Pa,500 Pa,1 kPa,2 kPa,4 kPa六个气压值下的等离子体通道发展过程及其外部特征。研究结果表明:电子自由行程变化对棒-板电极工频放电等离子体通道发展过程及外部特征影响显著。在100 Pa^4 kPa气压范围内随气压升高,击穿前板电极起始等离子体通道占放电间隙比例先升后降,击穿后持续等离子体通道外形变化经历"条纹状-间断状-连续状"三个阶段。研究结果为低气压下等离子体机理研究以及低气压下长间隙工频放电实验提供参考。Here,we addressedthe wide air-gap insulation,involved in transmission and transformation in power network in high sea-level plateau. The influence of low atmospheric pressure on the development of AC discharge plasma channel in 800 mm rod-plate gap was investigated with the lab-built test workbench,installed in polypropylene chamber. The results show that the pressure strongly affected the plasma channel development,because of the pressure-dependent electron mean free-path. For example,as the pressure increased in 100 Pa - 4k Pa range,before breakdown,the proportion of the plasma channel initiated from plate electrode and the gapchanged in an increasedecrease mode,accompanied by a decreasing electron free-path; after breakdown,the plasma channel ＇s shape changed from a beam consisting of transversal bright-dark strips first into two short bright segments interrupted by a diffused dark band,and then into a straight continuous bright beam gradually turning into a curve with smooth twists.

关 键 词：低气压 工频放电 等离子体 长间隙 电子自由行程 

分 类 号：TM85[电气工程—高电压与绝缘技术]