三支柱绝缘子的设计与研究

Design and Study of Three-Pillar Insulators

气体绝缘金属封闭输电线路(GIL)是一种可以克服输电走廊复杂环境限制、实现城市中心大容量输电的高电压电力传输设备。GIL主要包括三支柱绝缘子、微粒捕捉器、壳体及导体等。三支柱绝缘子作为GIL的关键零部件之一,其电气性能及机械强度直接影响着GIL的运行稳定性。从GIL整体结构设计入手,详细论述了550 kV GIL三支柱绝缘子的优化设计过程,并以电磁场理论为基础对三支柱电场进行仿真解析。通过引入“电场面积”的概念,对比不同尺寸下三支柱沿面电场强度阶梯下的面积大小,得出最优结构。该设计解决了三支柱绝缘子沿面放电的问题,为GIL的开发及应用提供参考。

Gas-insulated metal enclosed transmission line(GIL)is a kind of high-voltage power transmission equipment that can overcome the complex environmental constraints of transmission corridors and realize large-capacity transmission in urban centers.GIL mainly includes three-pillar insulators,particle catchers,shells,and conductors,etc.As one of the key components of GIL,the three-pillar insulator’s electrical performance and mechanical strength directly affect the operational stability of GIL.Starting from the overall structural design of GIL,the optimization design process of the three-pillar insulator of 550 kV GIL is discussed in detail,and the electric field of the three-pillar is simulated and analyzed based on electromagnetic field theory.By introducing the concept of“electric field area”and comparing the area size of the three-pillar with different sizes under the electric field intensity step along the surface,the optimal structure is derived.The design solves the problem of the three-pillar insulators discharging along the surface and provides a reference for the development and application of GIL.