染污绝缘子盐分迁移对其覆冰状态及泄漏电流的影响  

Influence of Polluted Insulator Salt Migration on the Icing Condition and the Leakage Current

作　　者：苗锋雨 张英敏[1] 褚正超[1] 吴浩哲 

机构地区：[1]四川大学电气信息学院,成都610000 [2]中国电力科学研究院,北京100000

出　　处：《电瓷避雷器》2015年第3期5-12,共8页Insulators and Surge Arresters

摘　　要：基于冰水相变过程中的盐分迁移原理,对不同电导率的覆冰水进行覆冰试验,在覆冰完成后表层冰融冰水电导率约为覆冰水电导率的2倍。而且随着覆冰水电导率的增大,表层融冰水电导率较覆冰水电导率提高的倍数越大。通过分析相同覆冰水不同盐密下的绝缘子带电覆冰,发现高盐密下绝缘子冰棱增长速度较慢,持续时间较长。为了对比不同盐密和不同电导率覆冰水对覆冰绝缘子串闪络特性的影响,提出等值含盐量的观点。通过500 kV交流绝缘子串进行带电覆冰试验,结果表明低盐密高电导率覆冰水的闪络电压较低,闪络前出现大泄漏电流的数量也较少。Based on the salt migration mechanism and icing experiment with different conductivities of water, it is found that the melting water conductivity from surface ice is about 2 times higher than the original one. And with the icing water conductivity increasing, the conductivity of the melting water increases greatly. By analyzing insulators with different salt density charged icing, high salt density insulators icicles grow slower with longer duration. In order to compare the effects of conductivity of applied water and salt density, the view of equivalent salinity is put forward. Finally according to the 500kV AC insulator string test, the results show that high conductivity water with low salt dense icing has lower flashover voltage, the number of high leakage current is smaller.

关 键 词：盐分迁移 融冰 电导率 盐密 闪络 泄漏电流 

分 类 号：TM216[一般工业技术—材料科学与工程]