积雪腕臂绝缘子电场有限元仿真分析  

Electric Field Distribution Characteristics of Snow-covered Overhead Lines Cantilever Insulator Based on Finite Element Method

作　　者：李刚 李彦哲[1,2] 李宝学[3] LI Gang;LI Yanzhe;LI Baoxue(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province(Lanzhou Jiaotong University),Lanzhou 730070,China;China Railway Lanzhou Group Co.,Ltd.,Jiayuguan Power Feed Section,Jiayuguan 735100,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]甘肃省轨道交通电气自动化工程实验室(兰州交通大学),兰州730070 [3]中国铁路兰州局集团有限公司嘉峪关供电段,甘肃嘉峪关735100

出　　处：《电瓷避雷器》2022年第3期209-216,共8页Insulators and Surge Arresters

摘　　要：中国铁路接触网腕臂绝缘子冬季面临“雪闪”问题,研究多种积雪条件下,对平、斜安装腕臂绝缘子的电场特性影响,为绝缘子选型及优化提供理论依据。以QBG-25型棒式瓷绝缘子为研究对象,建立有限元电场模型,分析温度、积雪厚度、融雪覆冰厚度及污秽类型对绝缘子电场特性的影响。仿真结果表明:当温度低于0℃时,绝缘子电场强度随温度的降低先增大后减小,在-2℃时电场强度达到峰值;积雪厚度对电场强度影响呈现先增长后减小的变化趋势,各个伞裙电场强度与伞裙表面积雪形态有关,表面积雪程度严重但未完全覆盖时,电场强度畸变最严重;融雪覆冰厚度对绝缘子表面电场强度影响呈正相关关系;当积雪参数相同时,积雪绝缘子预污秽模型电场强度畸变最严重,积雪绝缘子污秽沉降模型电场强度畸变程度最小;平安装绝缘子电场强度相比于斜安装时提高了16.46%。绝缘子预污秽模型、污雪模型和污秽沉降模型下,平安装绝缘子电场强度相比于湿雪时提高了36.90%,37.32%,16.86%,斜安装绝缘子电场强度相比于湿雪时提高了16.22%、13.05%和14.27%,污秽进一步加剧积雪绝缘子电场畸变。The catenary cantilever insulators applied in China railway are facing the problem of snow flash in winter. The study of electric field distribution characteristics of the insulator oblique and horizontal suspension under different snow factors can provide a theoretical basis for the insulator selection and design. Taking QBG-25 type porcelain rod insulator as the research object, the finite element electric field model is established. The influence of temperature, snow thickness, ice thickness of melting snow and pollution type on electric field characteristics of insulators are analyzed. The results show that when the temperature is lower than 0 ℃, the electric field intensity of the insulator increases first and then decreases as the temperature decreases, and the electric field intensity reaches the peak value at-2 ℃. The influence of snow thickness on the electric field intensity shows a trend of increasing first and then decreasing. The electric field intensity of each shed is related to the snow shape of the shed surface area. When the surface snow is serious but not completely covered, the electric field intensity distortion is the most serious. The ice thickness of melting snow has a positive correlation with the surface electric field intensity of insulator. When the snow parameters are the same, the dirty insulator covered clean snow model has the most serious electric field intensity distortion. The dirty settlement model covered clean snow has the least serious electric field intensity distortion. The electric field intensity of the horizontal suspension insulator is 16.46% higher than that of the oblique suspension insulator. Under the Pre-polluted insulator model, dirty snow model and dirt settlement model, the electric field intensity of horizontal suspension insulators increases by 36.90%, 37.32% and 16.86% compared with that of wet snow, and the electric field intensity of oblique suspension insulators increases by 16.22%, 13.05% and 14.27% compared with that of wet snow, which further aggra

关 键 词：腕臂绝缘子 积雪 电场分布 有限元仿真 

分 类 号：TM216[一般工业技术—材料科学与工程] U226.8[电气工程—电工理论与新技术]