高海拔地区±800kV复合支柱绝缘子直流污闪特性  

DC Flashover Performance of ±800 kV Composite Post Insulator in High Altitude Area

作　　者：杨皓麟[1] 张福增[1] 赵锋[1] 王黎明[1] 关志成[1] 

机构地区：[1]清华大学深圳研究生院,深圳518055

出　　处：《高电压技术》2009年第4期749-754,共6页High Voltage Engineering

基　　金：国家"十一五"重点科技攻关项目(2006BAA02A19)~~

摘　　要：为给特高压直流变电外绝缘设计提供试验依据,在实际海拔1970m条件下对4种复合支柱绝缘子和2种瓷支柱绝缘子进行了恒压升降法直流污闪试验,研究了高海拔条件下盐密、灰密以及绝缘子材质和几何形状等因素对其直流污闪特性的影响。结果表明,污闪电压随盐密、灰密的增大而下降,并分别符合幂函数关系;盐密与灰密对污闪电压的影响相互独立;用最小二乘法可以得到给定结构绝缘子的直流污闪电压计算公式。比较不同绝缘子的污闪特性表明,复合支柱绝缘子直流污闪特性优于瓷支柱绝缘子,单位绝缘高度直流污闪电压随芯棒直径增加而减小。以上结果可为我国高海拔地区直流输电外绝缘配置的选择和设计提供参考。In order to provide an experimental basis for extra high voltage DC external insulation design, DC contamination was tested by constant voltage up-and-down method in the area of actual high altitude（ 1970 m）. The DC flashover performance of 4 types of eomposite post insulator and 2 types of ceramic post insulator under different ESDD, NSDD, insulator material and shapes were studied. The tests were carried out at YunNan Electric Power Research Institution, using a high speed camera to record the flashover arc and an instrument developed by Tsinghua University to record the leakage current in the tests. The result indicates that DC flashover voltage decreases by a power function when ESDD or NSDD increases. The influences of ESDD and NSDD on voltage are independent with each other and the formula for a certain type of insulator is proposed by the least square method. Comparison among insulators shows that DC flashover performance of composite post insulators is better than ceramic post insulators. Besides, DC flashover voltage of unit insulation length decreases when mandrel diameter increases.

关 键 词：高海拔 复合支柱绝缘子 盐密 灰密 伞裙结构 直流污闪特性 

分 类 号：TM85[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]