室温硫化硅橡胶表面污秽水珠放电特性  

Discharge Characteristics of Polluted Water Droplets on Insulating Medium Surface

作　　者：姚刚[1] 文习山[1] 蓝磊[1] 

机构地区：[1]武汉大学电气工程学院,武汉市430072

出　　处：《电力建设》2010年第2期111-113,共3页Electric Power Construction

基　　金：国家重点基础研究发展计划(973计划)(2009CB724500)

摘　　要：为了研究不同极性电场下室温硫化硅橡胶(RTV)表面存在分离水珠时的放电特性,进行了表面放电试验;利用有限元法计算了水珠对憎水性表面沿面电位及电场强度的影响;捕捉了RTV表面和玻璃表面存在分离水珠时的放电现象。试验结果表明,同种布液情况下电场呈现极性效应,RTV表面水珠附近电场值发生严重畸变,水珠发生强烈局部放电并变形,局部小电弧由两极向中间发展沿水珠顶部贯通完成闪络,玻璃表面电弧则直接燃烧贯通两极。In order to study discharge characteristics of polluted water droplets on the RTV and glass under different polarity electric field, the paper uses finite element method to compute the severe non-uniform electric field distribution on the hydrophobic surface with different characteristics of water droplets. Discharge phenomena was captured by high-speed camera. Experimental study was held under inhomogeneous electric which presents different polarity. The results showed that polarity effect appeared in allogenic conditions. Wet pollution leads to new characteristic on flashover voltage. Droplets on hydrophobic surface produce partial discharge and distort under the electric field force, local arc develops from two ends to middle, and the flashover accomplished through the top of the droplets, electric arc burnt directly along hydrophilic surface through two electrodes.

关 键 词：室温硫化硅橡胶 湿污秽 亲水性 憎水性 电场强度 闪络 不均匀电场 

分 类 号：TB37[一般工业技术—材料科学与工程]