GIL中电极覆膜对金属微粒表面电场及受力的影响  

Effect of Dielectrically Coated Electrode on Surface Electric Field and Force of Metal Particles in GIL

作　　者：律方成 董蒙 颜湘莲[2] 刘宏宇 李志兵[2] 

机构地区：[1]新能源与电力系统国家重点实验室(华北电力大学),北京102206 [2]中国电力科学研究院,北京100192

出　　处：《南方电网技术》2017年第8期55-60,共6页Southern Power System Technology

基　　金：国家重点研发计划(2017YFB0902504)~~

摘　　要：研究气体绝缘金属封闭线路(gas insulation line,GIL)中电极覆膜后金属微粒的表面电场及受力对探究覆膜提高微粒起跳场强的原因具有重要意义。分别建立了裸电极和覆膜下微粒周围电场分布的计算模型,电场计算分析结果表明:裸电极下电场最大值在微粒顶端,受到向上的电场力;覆膜下电场最大值在微粒与薄膜之间,受到的电场力方向与其带电量有关,存在向下和向上两种情况。微粒与薄膜间的局部放电可能使覆膜下的微粒带电,当电场达到裸电极下微粒的起跳场强时,微粒仍然可能不带电但受到向下的电场力。因此,电荷量减小和电场力向下是覆膜提高微粒起跳场强的原因。It is of great significance to study the electric field and force of metal particles on the dielectrically coated electrodes of gas insulation line（ GIL） to investigate the reasons of coating enhancing the lifting field strength of particles. Calculation models of the electric field distribution of particles on electrodes with or without dielectric coating are established respectively. Electric field calculation results show that the maximum value of the electric field under bare electrode appears at the top of the particle and is subjected to an upward electric field. While the maximum value of the electric field under dielectrically coated electrode appears between the particle and the coating,and the direction of the electric field force is related to the electric charge,and there are two kinds of situations,downward or upward. The partial discharge between the particles and the coating is the main mechanism of particle charging under the dielectrically coated electrode,when the electric field strength reaches the lifting field strength under bare electrode,the particle may still be uncharged,but it is subjected to the downward electric field force. Therefore,the decrease of electric charge and the downward of the electric field force are the reasons enabling coating to enhance the particle lifting field strength.

关 键 词：气体绝缘金属封闭线路(GIL) 电极覆膜 金属微粒 电场 受力 

分 类 号：TM854[电气工程—高电压与绝缘技术] TM153.3