110kV复合绝缘子串交流冰闪特性的比较  

Comparison of AC Icing Flashover Performance of 110 kV Composite Insulators

作　　者：蒋兴良[1] 董冰冰[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《中国电机工程学报》2012年第31期128-133,228,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724501/502);国家创新研究群体基金(51021005)~~

摘　　要：覆冰地区现有的复合绝缘子的伞形结构较易被冰凌桥接,使其电气绝缘性能下降,在运行电压下发生冰闪导致停电,严重时将威胁电网的安全运行。基于多功能人工气候室内4种结构的110 kV复合绝缘子串的覆冰特征,比较研究了它们的覆冰特性、冰闪特性和闪络过程的影响。结果表明:相同覆冰条件下,110 kV防冰闪型复合绝缘子的特征指数a(表征污秽程度ESDD对冰闪电压Uf影响的特征指数)小于普通型复合绝缘子串,其冰闪电压比普通型绝缘子提高的百分比随着染污盐密的增加而增大,即污秽程度越重,防冰型复合绝缘子的冰闪电压比普通型复合绝缘子提高的幅度就越大。因此,合理的复合绝缘子的结构可提高其冰闪特性,该文的研究结果可为我国覆冰地区输电线路复合绝缘子的选择和设计提供参考。The electrical insulation strength of existing composite insulators would reduce with the shed configuration which is easier to be bridged by the ice in icing regions. Icing flashover of insulator strings can lead to power outages, even worse, threatens the safe operation of power networks at normal service voltage. Based on the icing characteristics of four types of 110 kV composite insulators in the multi-function artificial climate chamber, the icing influence, icing flashover influence and flashover process were investigated and compared. The results show that the characteristic exponents a （characterizing the influence of pollution degree ESDD on the flashover voltage Uf） of the ll0kV anti-icing composite insulators are smaller than that of the normal composite insulator in the same icing conditions. Moreover, the percentage of voltage increases between the former and latter increases with the increase of the pollution degree ESDD. Namely, the pollution is more serious, the flashover voltage of anti-icing composite insulators is higher than normal. So the reasonable composite insulator＇s umbrella structure can improve the icing flashover performance. The results can offer some consult for the selection and design of composite insulator used transmission lines in the icing regions.

关 键 词：覆冰 110kV 交流 闪络电压 冰闪特性 复合绝缘子 

分 类 号：TM75[电气工程—电力系统及自动化]