线路绝缘子覆冰中盐分分布规律研究  

Research on Law of Salt Distribution of Ice-Covered Transmission Line Insulators

作　　者：李亚伟[1] 张星海[1] 贾志东[2] 孙磊[2] 周朋[2] 

机构地区：[1]国网四川省电力公司电力科学研究院,成都610072 [2]清华大学深圳研究生院,深圳518055

出　　处：《电瓷避雷器》2017年第2期116-122,共7页Insulators and Surge Arresters

基　　金：中国博士后科学基金面上资助(编号:2014M562506XB);国家电网公司科技项目(编号:GY71-13-034);国家自然科学基金(编号:51177081)

摘　　要：绝缘子覆冰后电气性能大幅下降,在融冰期,由冰内盐分分布不均造成的冰面高电导率水膜显著提高闪络概率。以玻璃绝缘子为研究对象,通过覆冰试验,测量了不同覆冰条件下,融冰水电导率随融冰时间的变化趋势,根据测量结果选择合理的拟合方程,研究了绝缘子覆冰内的盐分迁移特性,定义了冰面含盐系数α和冰内盐分分布系数β对冰层盐分分布进行定量表征。研究结果表明,沿覆冰融化方向,雨凇覆冰内的含盐量按指数规律下降。冰面含盐系数α和冰内盐分分布系数β受温度、降水强度、风速、电压等覆冰环境因素的影响,不同因素的影响规律有所不同。本文研究成果可作为计算绝缘子覆冰闪络概率的参考。Electrical performance of transmission lines fall sharply after icing. In the period of melting, high conductivity water film on the surface of ice, caused by uneven distribution of salt in ice, significantly increased the probability of flashover. Ice tests are carried out under different conditions with glass insulators, as research objects in the article, to measure the trend of melting ice water conductivity with time. According to measurement results, reasonable fitting equation is chosen to study salt migration characteristics of ice on insulators. The ice surface salt coefficient α and the salt distribution coefficient in ice fl are defined for quantitative characterization. It is shown that, along the direction of melting, the salt content of glaze decline according to the law of index. The ice surface salt coefficient α and the salt distribution coefficient in ice β are affected by icing environment factors such as temperature, rainfall intensity, wind speed and voltage. The influence laws of different factors are different. The research results of the article can provide reference for flashover probability calculation of ice-covered insulators.

关 键 词：盐分迁移 融冰水 电导率 覆冰 绝缘子 

分 类 号：TM216[一般工业技术—材料科学与工程] TM75[电气工程—电工理论与新技术]