气体绝缘系统电极表面覆膜时金属导电微粒带电原因分析  

Charging Mechanism of Metallic Conducting Particle on a Dielectrically Coated Electrode in Gas Insulated System

作　　者：张乔根[1] 贾江波[1] 杨兰均[1] 原雅则[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]日本九州大学电气与电子系统工程系

出　　处：《西安交通大学学报》2004年第12期1287-1291,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(5 0 3770 33)

摘　　要：在施加直流或交流电压的表面覆涂绝缘介质的楔形电极结构条件下 ,讨论了SF6 中自由金属导电微粒在电场梯度力存在时的运动特性 .通过实验测得的自由导电微粒运动起始时的电压 ,计算得到微粒所带电荷量 ,该结果与采用法拉第筒测得的结果吻合 ,即当电极表面覆以 10 0 μm厚的聚对苯二甲酸乙二醇酯(PET)薄膜时 ,微粒带电量约为未覆膜时的 30 %～ 6 0 % .通过对微粒与介质间局部放电导致发光现象的实验观测研究 ,表明表面覆涂绝缘介质的非平行平板电极间自由金属导电微粒的带电机理在直流电压下为电导电流或薄膜表面极化带电 。Charging behavior of a metallic conducting particle on a dielectrically coated electrode in the presence of electrical gradient force in SF6 stressed by DC or AC voltage was discussed. The particle charge quantity was estimated with the aid of the particle motion onset voltage, and was coincident with the measurement result via Faraday cage. The charge quantity amounts to 30%-60% of quantity with bare electrode in case of the grounded electrode coated with polyethylene terephthalate film of 100 μm thickness. And the charging mechanism of the particle on a dielectrically coated electrode between non-parallel plane electrodes was investigated by observing light emission of partial discharge. Under DC voltage the conductive current through the dielectric coating or charged dielectric surface dominates during the charging, and the microdischarge between the particle and the coating arises remarkably under AC voltage.

关 键 词：气体绝缘系统 金属导电微粒 非平行平板电极结构 电场梯度力 

分 类 号：TM854[电气工程—高电压与绝缘技术]