±800kV特高压直流复合绝缘子短样不均匀染污闪络电压与校.PDF

±800kV 特高压直流复合绝缘子短样不均匀 染污闪络电压与校正系数研究 蒋兴良 王少华 张志劲 胡建林 胡琴 (重庆大学电气工程学院，输配电装备及系统安全与新技术国家重点实验室；重庆 400030) Investigation on Flashover Performance and Correction Factor of Short Sample of ±800kV UHV DC Composite Insulator under Non-uniform Pollution JANG Xing-liang WANG Shao-hua ZHANG Zhi-jin HU Jian-lin HU Qin (State Key Laboratory of Transmission and Distribution Equipment and System Security and New Technology, College of Electric Engineering, Chongqing University, Chongqing 400030, China) ABSTRACT: Non-uniformly distribution of contaminant at the 0 引言 top and bottom surfaces of an insulator has an important influence on its DC flashover voltage. A lot of investigations are 我国正在建设国际上第一条特高压直流输电工 carried out on porcelain and glass insulators, but very few on composite insulators. Based on the artificial pollution tests 程，即云南至广东的±800kV 特高压输电工程，该 carried on the short sample of a ±800kV UHV DC composite 工程预计2009 年单极投入运行。由于该线路路径面 insulator, this paper analyzes the influence of non-uniformly 临严重污秽的影响，除严重覆冰和高海拔地区以外， distribution of contaminant of the DC composite insulator on its 该工程输电线路绝缘子全部采用复合绝缘子，并且 flashover performances, and proposes a correction factor of flashover voltage. The test results show that the characteristic 以“三伞五组合”伞型结构为主。由于国际上没有 exponent b, which indicates the effect of salt deposit density 特高压复合绝缘子运行的经验，能够借鉴的试验数 (SDD) on the 50% flashover voltage U50 and has a value of 据也不多，主要设计依据是污秽试验室的试验结果。 between 0.221 and 0.254 when the ratio (T/B) of SDDs of top and bottom surface is from 1/1 to 1/10, is independent with T/B, 因此污秽地区的外绝缘设计和选择是我国目前正在 and that U50