摘要
雪对电力系统可靠运行构成极大威胁,对积雪复合绝缘子沿面电场分布规律进行研究具有重要工程价值和意义。基于准静态电场有限元方法,提出了雪的三角形模型,开展了雪形态和雪参数对高海拔110 k V复合绝缘子沿面电场的影响研究。通过搭建高海拔110 k V复合绝缘子二维轴对称模型,研究了大伞积雪时雪面积和雪高度、桥接积雪时空气间隙长度和空气间隙位置对沿面电场的影响,分析了雪参数变化情况下的沿面电场分布。结果表明:大伞积雪时,雪面积和雪高度的变化对沿面电场分布影响较弱;桥接雪能改善沿面电场分布;绝缘子周围最大场强随着相对介电常数的增加而增大;电阻率不影响场强分布;桥接积雪时,雪参数变化严重威胁绝缘子的电气绝缘性能。
Snow will threaten the reliability of a power system. Therefore, it has important engineering value and significance to calculate the electric field distribution along the surface of snowed composite insulators. In this paper, the authors put forward the triangle model of snow. And how the snow shape and parameter affects the electric field along the surface of composite insulators on 110 k V transmission lines on high altitude is studied through the quasi-static electric field finite element method. The two-dimensional axial symmetry models of the snowed composite insulators are given to study electric field distribution along the surface, after changing area and height of snow on the large sheds, air length and position when the large sheds are completely bridged by snow. Also the snow parameters’ influence on the electric field along the surface is analyzed. The results show that, when snow only exists on the large sheds, snow height and thickness have little influence on electric field distribution along the surface. And electric field distribution along the surface has improved when the large sheds are completely bridged by snow. The maximum field intensity of insulators increases with the increase of relative permittivity when snow only exists on the large sheds. Electrical resistivity has no influence on the electric field along the surface.Snow parameters seriously changed would threaten the electrical insulation properties of the insulators when the large sheds are completely bridged by snow.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第6期115-123,共9页
High Voltage Apparatus
基金
国家高技术研究发展计划(863计划)(2012AA050802)
中央高校基本科研业务费项目(13MS73)
国家电网科技项目(1214414011043)~~
关键词
复合绝缘子
高海拔
积雪
冰雪共存
沿面电场
准静态电场有限元法
composite insulator
high altitude
icing
ice and snow coexisting
electric field along the surface
quasi-static electric field finite element method
