500kV长串绝缘子人工污秽闪络特性试验分析  

Experimental Analysis of Artificial Contamination Flashover Characteristics of Long Insulator Strings on 500kV Transmission Lines

作　　者：张秀丽[1] 张勤[2] 袁田[2,3] 胡建勋[3] 

机构地区：[1]华南农业大学工程学院,广州510640 [2]中国电力科学研究院,武汉430074 [3]武汉大学电气工程学院,武汉430072

出　　处：《高电压技术》2013年第12期3069-3074,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724507)~~

摘　　要：利用短串绝缘子的污秽耐受电压数据来推算长串绝缘子的污秽耐受电压会带来很大偏差,因此通过试验测量了500kV长串绝缘子的污秽闪络特性。选取典型防污型XWP2-160双伞型瓷绝缘子为试品,对单悬垂绝缘子串在不同等值附盐密度(ESDD)、不同等值附灰密度(NSDD)以及不均匀积污工况下的人工污秽工频耐受电压特性进行研究后,根据试验结果求出该类型绝缘子的爬电距离有效系数,并对XWP2-160型瓷绝缘子V型串、倒V型串、单悬垂串试验结果进行了对比。试验结果表明:XWP2-160绝缘子串人工污秽闪络电压与ESDD、NSDD呈负相关关系;单悬垂型绝缘子串的爬电距离有效系数为0.78;V型绝缘子串和倒V型绝缘子串单片绝缘子的最大污秽耐受电压与单悬垂串相比有不同程度的增加,V型串和倒V型串的串型修正系数分别为1.08和1.15。这些数据可作为500kV长串绝缘子的挂网运行提供防污参考。We experimentally measured the artificial contamination flashover characteristics of 500 kV long insulator strings, since reckoning the flashover voltage of long insulator strings based on data of short insulator strings would result in large deviations. Taking XWP2-160 type two umbrella porcelain insulators as samples, we obtained the artificial contamination flashover voltages of hang single-string insulators under different equivalent salt deposit density （ESDD）, different non-soluble deposit density （NSDD）, and uneven deposition filthy through experiments. Moreover, we calculated the effective coefficient of creepage distance for this type of insulator string according to the experimental results, and compared the results from tests using string insulators of ＂V＂ type, inverted-V type and single hang type to get the correction coefficient for abnormal types of insulator strings. Experimental results reveal that, the flashover voltage of XWP2-160 insulator string is negatively correlated to ESDD and NSDD; the effective coefficient of creepage distance for the single hang type is 0.78; the flashover voltage of a single insulator from a ＂V＂ type or inverted-V type string is slightly higher than that from the single hang type strings; the string-structure correction coefficients of ＂V＂ type and inverted-V type are 1.08 and 1.15 , respectively. The results can be referred by the anti-contamination works for operation of the long insulator strings on 500 kV transmission lines.

关 键 词：长串绝缘子 防污特性 爬电距离 人工污秽 闪络电压 等值附盐密度 等值附灰密度 

分 类 号：TM216[一般工业技术—材料科学与工程]