污秽绝缘子安装并联间隙的雷电击穿特性分析  

Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance

作　　者：廖一帆[1,2] 胡传良[1] 唐军 杨帆 陈智豪 周宇 陆展辉 LIAO Yifan;HU Chuanliang;Tang Jun;YANG Fan;CHEN Zhihao;ZHOU Yu;LU Zhanhui(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Technology Research Centre,China Southern Power Grid Co.Ltd.,Guangzhou 510670,China;State Grid Hunan Electric Power Corporation Chenzhou Power Supply Company,Chenzhou 423000,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]中国南方电网有限责任公司电网技术研究中心,广东广州510670 [3]国网湖南省电力公司郴州供电分公司,湖南郴州423000

出　　处：《西南交通大学学报》2018年第6期1117-1122,共6页Journal of Southwest Jiaotong University

基　　金：特高压工程技术国家工程实验室开放基金资助项目(NEL201504)

摘　　要：为了分析不同盐密值下污秽绝缘子并联间隙的雷电冲击击穿特性,以SC-210瓷横担绝缘子为例进行雷电冲击试验,通过对比清洁和污秽绝缘子的电场仿真结果,对试验时多次发生沿绝缘子表面闪络的现象进行了分析.试验和分析表明:安装并联间隙的SC-210瓷横担,其雷电冲击击穿电压U50%随盐密值增加而降低,更容易趋于饱和;污秽绝缘子与防雷间隙的雷电冲击伏秒特性曲线逐渐相交,试验时多次发生沿绝缘子表面闪络的现象.研究结果建议在进行并联间隙与绝缘子串的绝缘配合整定时,应考虑绝缘子表面污秽对闪络/击穿部位的影响.To analyse the lightning impulse breakdown characteristics of the parallel gaps of contaminatedinsulators with different salt densities, the SC-210 porcelain cross-arm insulator was used to conduct the lightningimpulse test. Comparing with the electric field simulation results of the clean and contaminated insulators, thephenomenon of flashover along the surface of the insulator was analysed several times during the test. The testsand analysis indicate that in case of the SC-210 porcelain eross-arm installed with parallel gaps, its lightningimpulse breakdown voltage U50% decreases with increasing salt density and tends to saturate more readily. Thevoltage-time characteristics curve of the lightning impulse of the contaminated insulator and the lightningprotection gap gradually intersect, and the phenomenon of flashover along the surface of the insulator occursseveral times during the test. The results of the study suggest that the effect of contamination on theflashover/breakdown location on the surface of the insulator should be considered in the insulation timing of theparallel gap and the insulator string.

关 键 词：防雷 并联间隙 污秽 雷电冲击闪络 伏秒特性 

分 类 号：TM261.1[一般工业技术—材料科学与工程]