110kV玻璃绝缘子串交流覆冰的闪络特性  

AC Electric Characteristics of the Ice-covered 110 kV Glass Insulator Strings

作　　者：贾志东[1] 李智宁[1,2] 苏华锋[1,2] 邓禹[1,2] 关志成[1] 

机构地区：[1]清华大学深圳研究生院,深圳518055 [2]清华大学电机工程与应用电子技术系,北京100084

出　　处：《高电压技术》2011年第5期1074-1081,共8页High Voltage Engineering

摘　　要：以往研究表明绝缘子在覆冰状况下,绝缘性能将大幅降低,在融冰期会因表面高电导率水膜的存在而在正常工作电压下发生覆冰闪络。为得到110 kV电压等级玻璃绝缘子串的交流覆冰闪络特性,清华大学电机工程与应用电子技术系采用均压升压法进行了一系列的覆冰闪络试验,通过研究覆冰水电导率的大小、冰凌的桥接程度、污秽的严重程度以及融冰水电导率对闪络过程的影响来讨论融冰期覆冰闪络的机理。试验结果表明：覆冰绝缘子串的平均闪络电压与覆冰水电导率呈负幂指数关系,并随污秽程度的增加而下降;融冰水电导率随融冰时间有明显变化,在30~40 min时达到最大值;冰棱间气隙的存在会降低平均闪络电压。We researched the flashover voltage of the ice-covered 110 kV AC full-size glass insulator strings in an artificial climate room,and researched the effect of the icing and melting water,the length of the icicles and the ESDD on the flashover voltage.Three different lengths of the icicles and three different ESDD were considered,and the conductivity of the melting water and icing water was monitored to analyze the influence on the flashover voltage.The test results show that,the average flashover voltage and the conductivity of icing water are in negative exponential relationship.And the average flashover voltage will decrease with the increasing of ESDD.It is proved that the conductivity of melting water will be changed during the melting period and reaches the highest value after 30 to 40 minutes;the air gap between the icicles will help decrease the average flashover voltage.

关 键 词：覆冰闪络 均匀升压法 覆冰水电导率 冰棱桥接长度 融冰水电导率 等值附盐密度 

分 类 号：TM216[一般工业技术—材料科学与工程]