摘要
为研究高电导率盐碱雾对高速铁路接触网污秽绝缘子的闪络特性,利用多物理场耦合软件Comsol Multiphysics仿真计算分析了盐碱雾存在下染污绝缘子的空间电位和电场分布;采样分析了盐碱地区的污秽及盐碱雾水成分,配置污秽及盐碱雾水溶液,使用固体涂层法对试品染污,通过人工气候室模拟盐碱地区雾水环境,研究盐碱雾水和表面污秽共同作用下的闪络电压,并得出盐密修正系数K。结果表明:盐碱雾水通过浸湿绝缘子表面已有的污秽层,改变了原有的表面等值盐密ρESDD,使原有的表面污秽层等值盐密变为KρESDD;绝缘子表面的等值盐密ρESDD越小,其盐密修正系数K越大;同一种绝缘子表面污秽下,盐碱雾水浓度越大,盐密修正系数K增幅越明显。
In order to study the influence of high conductivity of salt-alkali fog on the flashover characteristics of high-speed railway OSC insulators, the spatial potential and electric field distribution of polluted insulators in saline-alkali fog environment were analyzed by multi-physics coupling software Comsol Multiphysics. The contamination in saline-alkali area and components of saline-alkali fog were analyzed by sampling. Contamination and saline-alkali fog solution were prepared, and the samples were polluted using the solid coating method. The salt-alkali fog environment was simulated by climate chamber, and the flashover voltages of samples under different conductivity of salt-alkali fog and surface contamination were obtained, and then the salt density correction coefficient(K) was proposed. The results show that the contamination layer on the insulator surface is wetted by the salt-alkali fog, leading to the original surface equivalent salt density(ρESDD) be changed, making the original ρESDD of surface contamination layer be equivalent to KρESDD. The smaller the ρESDD, the larger the K. Under the same surface contamination of insulator, with the increase of concentration of salt-alkali fog, the K increases obviously.
作者
马政
李彦哲
吴有龙
李刚
MA Zheng;LI Yanzhe;WU Youlong;LI Gang(College of Automation&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《绝缘材料》
CAS
北大核心
2020年第5期90-96,共7页
Insulating Materials
