±800kV特高压换流站支柱绝缘子自然积污特性  

Contamination Accumulating Features of Post Insulators in ±800 kV UHVDC Convertor Station

作　　者：李黎[1] 华奎 李哲[2] 刘泽辉[2] 李瑶琴[1] 卢明[2] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北省武汉市430074 [2]国网输电线路舞动防治技术重点实验室(国网河南省电力公司电力科学研究院),河南省郑州市450052

出　　处：《电网技术》2016年第12期3951-3957,共7页Power System Technology

基　　金：国家电网公司重大基础前瞻科技项目(SG20141187)~~

摘　　要：为研究特高压换流站支柱绝缘子的自然积污状况,2014年和2015年在±800 kV哈郑直流中州换流站进行了自然积污试验。结果表明:污秽程度从轻到重依次为不带电设备,交流带电运行的设备,直流带电运行的设备;瓷绝缘子表面污秽程度相差不大,而对于复合和表面喷涂RTV的支柱绝缘子,极II侧(负极)比极I侧(正极)的积污程度严重,极II侧等值盐密平均为极I侧2.4倍,极II侧等值灰密平均为极I侧2.7倍;无论正、负极性,瓷表面绝缘子积污最轻,其次是复合材质,积污最严重为喷涂RTV涂料绝缘子;积污物中阳离子主要为Ca^(2+)和K^+,阴离子主要为NO_3^-和SO_4^(2-);可溶性污秽的主要成分为CaSO_4和各类硝酸盐。In order to investigate contamination accumulating features of post insulators in UHVDC convertor station, a natural contamination experiment was carried out at ±800kV Zhongzhou convertor station, Henan in 2014 and 2015. Experiment results indicate that insulator pollution levels is ranked as insulators not energized, energized with AC and energized with DC, from light to heavy degree. Pollution difference for porcelain insulators is not obvious. As for composite and RTV-coating insulators, those at negative pole line bear more severe pollution. Equivalent salt deposit density（ESDD） ratio of insulators at negative bus to those at positive bus is 2.4; non soluble deposit density（NSDD） ratio of insulators at negative bus to those at positive bus is 2.7. Regardless of negative or positive pole, pollution of porcelain insulators is the least, followed by composite insulators, and pollution of RTV-coating insulators is the most serious. In contaminants, major cations are Ca^（2＋） and K~＋, major anions are NO_3^- and SO_4^（2-）. Major soluble deposit is CaSO_4 and nitrates.

关 键 词：直流输电 换流站 绝缘子 自然积污 等值盐密 

分 类 号：TM86[电气工程—高电压与绝缘技术]