交流电压下绝缘子附近导电微粒运动特性  

Motion of Conducting Particle Near PTFE Spacer Under AC Voltage

作　　者：贾江波[1] 张乔根[1] 师晓岩[1] 杨兰均[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2008年第5期7-11,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50377033)

摘　　要：在施加交流电压条件下,对楔形布置的电极间聚四氟乙烯(PTFE)绝缘子附近自由导电微粒运动进行了实验观察。通过对微粒运动过程进行摄像和记录微粒起始运动电压,讨论球形导电微粒和线形导电微粒的运动特性。对不同外形绝缘子附近导电微粒运动规律进行了分析,认为绝缘子的存在能够降低微粒运动起始电压,并且能够吸引部分球形导电微粒沿电极表面滚动到达绝缘子表面;当绝缘子表面与接地电极夹角为锐角时绝缘子附近的微粒运动起始电压会显著降低。对绝缘子存在情况下的楔形电极间电场进行计算,并对微粒运动规律做出了合理的解释。The motion characteristics of spherical and filamentary conducting particles near polytetrafluoroethylene （PTFE） spacer between divergingly settled electrodes is experimentally investigated under AC voltage based on the video records of the particle motion trajectories and the motion onset voltage. The investigation was performed with spacers of different shapes. A conclusion can be made that the spacer can reduce the motion onset voltage, and also attract spherical particles to roll along the grounded electrode to the spacer surface. It is found that the motion onset voltage for the particle near the spacer with sharp angle between the spacer surface and the grounded electrode is smaller than that with obtuse angle. The numerical calculation of electric field also explains the experimental results.

关 键 词：交流电压 导电微粒 气体绝缘系统 绝缘子 

分 类 号：TM854[电气工程—高电压与绝缘技术]