直流电压下绝缘子附近球形导电微粒运动特性  

Motion Behavior of Spherical Conducting Particle Around PTFE Insulator Under DC Voltage

作　　者：贾江波[1] 查玮[1] 杨兰均[1] 张乔根[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《高电压技术》2006年第11期18-21,共4页High Voltage Engineering

基　　金：国家自然科学基金资助项目(50377033)

摘　　要：为降低绝缘子附近的自由导电微粒对绝缘的危害,实验研究了球形导电微粒在不均匀电场中聚四氟乙烯(PTFE)绝缘子附近的运动特性,结果表明:绝缘子附近电场分布决定了微粒运动的特性。根据微粒初始位置的不同可以分为三种情况:微粒水平移动而后浮起;微粒直接浮起;微粒水平运动直至附着于绝缘子表面。不同外形绝缘子附近微粒运动特性不同,且绝缘子对微粒运动的影响范围也与绝缘子外形相关。Motion behavior of a spherical conducting particle near polytetrafluoroethylene（PTFE） insulator in inhomogeneous electrical field is experimentally observed. According to the initial position of the particle, its trajectories can be divided into three conditionsi.e. levitating after horizontal motion along grounded electrodes; levitating directly, approaching to insulator horizontally. According as the tilt angle of the high voltage electrode varies from 3. 5＊ to -3.5＊, the horizontal motion direction of the particle which is located in the range of lcm from insulator will also change. It is also considered that the different shapes of insulators lead to different motion trajectory of ：particle. The variation of the angle between insulator and the grounded electrode influence the attraction of insulator to the particle. When the angle is acute, the attraction of insulator to the particle is the most remarkable. Using the finite element method （FEM）, the etectric field distribution is numerically calculated in 2-dimension model as the particle is located near the insulator. It is showed that the motion behavior is seriously influenced by the distorted electric field around insulator.

关 键 词：气体绝缘系统 绝缘子 球形微粒 电场 运动 

分 类 号：TM85[电气工程—高电压与绝缘技术]