500 kV直流GIL支撑绝缘子的电场优化  

Electric Field Optimization of the Supporting Insulator of 500 kV DC GIL

作　　者：贾志杰[1] 李建明[1] 李佳[2] 范建斌[3] 李金忠[3] 李鹏[3] 张乔根[2] 

机构地区：[1]四川电力试验研究院,四川成都610072 [2]西安交通大学电气工程学院,陕西西安710049 [3]中国电力科学研究院,北京100192

出　　处：《高压电器》2010年第6期18-21,24,共5页High Voltage Apparatus

基　　金：国家自然科学基金(50877073)

摘　　要：随着电网建设的日益深入,直流气体绝缘金属封闭输电管道(GIL)由于可用在高电压、大容量的场合,用作经济的长距离输电线路而被提上研究日程。直流GIL支撑绝缘子的沿面闪络很大程度上是由表面电荷积聚引起的。直流下GIL的内部稳态电场分布主要受环氧树脂固体绝缘的电导率和形状控制。以500 kV直流GIL为计算模型,借助COMSOL软件,研究了GIL中支撑绝缘子的形状、体积电导率和表面电导率对电场分布的影响。研究认为,半圆锥式绝缘子的电场分布是最优化的,绝缘子的体积电导率对其电场分布影响不大,通过控制绝缘子表面电导率,可以控制和优化直流GIL中绝缘子沿面电场分布。The surface flashover of supporting insulators of DC gas insulated transmission line（GIL） GIL is mainly induced by surface charge accumulation.The distribution of interior electric field of DC GIL is mainly controlled by conductivity and geometry of insulator made of epoxy resin.Therefore,a model of 500 kV DC GIL is established in this paper,and the influences of geometry,volume conductivity,and surface conductivity of supporting insulators of GIL on electric field distribution are analyzed with the software COMSOL.The results show that the electric field distribution of semi-conical insulators is the optimum,the volume conductivity of the insulators exerts weak influence on the electric field distribution,and the electric field distribution on insulator surface of DC GIL can be controlled and optimized by controlling the surface conductivity of the insulators.

关 键 词：电场优化 电场分布 表面电荷积聚 形状 表面电导率 体积电导率 

分 类 号：TM85[电气工程—高电压与绝缘技术]