分离水珠对支柱绝缘子电场分布的影响  

Influence of Separated Globules on Post Insulator Electric Field Distribution

作　　者：徐志钮[1] 律方成[1] 李和明[1] 

机构地区：[1]华北电力大学生物质发电成套设备国家工程实验室,保定071003

出　　处：《高电压技术》2010年第9期2278-2284,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724508)~~

摘　　要：憎水性时表面的分离水珠对电场有畸变作用,容易导致局部放电。为此,基于有限元法建立了110kV瓷支柱绝缘子的真实模型和模拟的复合支柱绝缘子模型,基于准静态拟谐性场分析了分离水珠存在时表面电场/电位的分布情况并与不存在水珠的情况进行了比较,获得了容易发生局部放电的区域和水珠畸变场强的影响范围。同时分析了接触角、水珠间距、电导率对电场的影响,结果表明:水珠的存在畸变了其附近的电场,但对电场的整体分布和电位影响很小;上下金具附近、伞裙上表面与柱体相交处是电场集中区域;电场仅在大伞裙外侧以内小范围内发生畸变;复合支柱绝缘子沿面电场略小于同样形状的瓷支柱绝缘子;随着水珠接触角的增加/间距的减少电场畸变更严重;实际情况中水的电导率对场强几乎没有影响。Separated globules of hydrophobic surface will distort electric field,which will cause partial discharge.Consequently,we established a 110 kV porcelain post insulator and simulative composite post insulator model on the basis of the finite element method,obtained the surface electric field/potential of insulator with separated globules,which was compared with the condition without globules,and obtained the region generated partial discharge easily.Moreover,the field strength distortion scope of globules was analyzed,and the influences of contact angle,globule distance and conductivity on the field strength were analyzed.The result indicates that the separated globules have no influence on the whole electric field and potential distribution but distort the neighboring electric field.Electric field distorts badly nearby hardware fitting and section between parachute skirt upper surface and cylinder.The electric field is only distorted within a small range of large sheds lateral side;surface field strength of composite post insulator is slightly less than that of the same shape porcelain post insulator.The electric field will become more serious with the increase of contact angle and decrease of globule distance,and the field strength has nothing to do with the water conductivity.

关 键 词：支柱绝缘子 室温硫化(RTV) 憎水性 分离水珠 局部放电 电场畸变 

分 类 号：TM852[电气工程—高电压与绝缘技术] TM216[一般工业技术—材料科学与工程]