均压环安装位置对220kV复合绝缘子覆冰及其闪络特性的影响  

Influence of Grading Ring Installation Position on Ice Accretion and Flashover Characteristics of 220 kV Composite Insulators

作　　者：汪诗经[1] 舒立春[1] 蒋兴良[1] 胡琴[1] 袁伟[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400030

出　　处：《电网技术》2013年第6期1619-1624,共6页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724502);国家自然科学基金项目(51177179)~~

摘　　要：在人工气候室对不同位置安装均压环的220 kV复合绝缘子进行了人工带电覆冰试验,分析了均压环安装位置对绝缘子覆冰及电气特性的影响。结果表明:复合绝缘子本身电场分布极不均匀,使不同均压环安装位置对改善电场分布的效果不尽相同,从而对复合绝缘子覆冰有明显影响。高压端均压环使高压端伞裙覆冰比较均匀,冰棱生长较长,均压环冰棱呈向外弯曲生长,提高冰闪电压;低压端均压环使低压端伞裙相邻冰棱之间发生粘接,均压环冰棱基本呈垂直生长,降低冰闪电压;绝缘子和均压环表面覆冰密度大于冰棱冰密,安装均压环的高压端或低压端,其表面和冰棱冰密都大于不带均压环时;仅高压端带均压环时的绝缘子自身冰重大于仅低压端带均压环时。The artificial ice-coating tests of energized 220 kV composite insulator with grading rings installed in different positions are performed in artificial climate chamber, and the infuence of different installation positions of grading ring on ice accretion and flashover characteristics of 220 kV composite insulators is studied. Study results show that the distribution of electric field of 220 kV composite insulator itself is extremely uneven and it makes the effects of improving electric field distribution by different installation positions of grading ring are not the same, thus it obviously affects ice accretion on composite insulator. The grading ring installed at high voltage end of composite insulator makes the ice-coating on the sheds at the high voltage end relatively uniform and the icicles longer, and the icicles on grading ring grow outwards and crookedly, thus the icing flashover voltage is increased; the grading ring installed at grounded end of composite insulator makes adjacent icicles on the sheds at the grounded e/id spliced together and the icicles on the grading ring basically grow vertically, thus the icing flashover voltage is decreased; the density of ice accretion on both surfaces of composite insulator and grading ring is higher than ice density of icicles, and at the high voltage end or grounded end where the grading tings are installed the density of ice accretion on the surface of composite insulator and the density of icicles are higher than the condition without grading ring installed; as for the two conditions that the grading ring is only installed at high voltage end of composite insulator or at the grounded end of composite insulator, the weight of ice accretion on composite insulator itself under the former condition is heavier than that under thelatter condition.

关 键 词：复合绝缘子 均压环 冰棱 覆冰质量 覆冰密度 冰闪电压 

分 类 号：TM852[电气工程—高电压与绝缘技术]