1100kV GIS隔离开关的电场数值计算与分析

为了解特高压GIS隔离开关气室内部的电场强度分布情况,建立了两种典型结构的1100kV GIS隔离开关气室三维静电场数学模型。基于电场数值分析理论,采用有限元分析方法实现了大型实际工程电磁场问题的三维电场精确计算。对隔离开关的气室进行详细电场计算的结果表明,接地开关触头间隙是场强集中的区域,盆式绝缘子的结构尺寸的合理设计可以有效改善电极屏蔽罩区域的电场分布。对比两种隔离开关的电场强度分布结果可知,2种不同结构的对应区域场强最大值以及电场分布稍有差异,但都具有一定的绝缘裕度。电场分析所得的结果,为特高压隔离开关气室的整体和内部结构的进一步优化设计提供了理论依据。

Numerical Analysis of Electric Field of 1100 kV Disconnector in GIS

In order to understand the electric-field intensity(EFI) distribution within chamber of disconnector in GIS on extra high voltage(EHV),the three-dimensional electrostatic field mathematical model of two typical 1100kV GIS disconnector chambers was established.Based on the numerical analysis of electric field,the finite element method was adopted to calculate EFI within disconnector chamber.The calculation results show that the earthing switch contact gap is the focus region of EFI,and the reasonable size of the structure design of basin-insulator can effectively improve the regional distribution of electric field on the surface of electrode shield covers.By comparing the distributed results of EFI in two types of disconnector chambers,which are obtained in the corresponding region,the maximum EFI and the distribution of electric field are slightly different and have some certain insulation margin.Under the limited computer resources,the precision calculation of three-dimensional electromagnetic field and the analysis results of EFI are got,which provide a theoretical basis for further optimizing the design of whole and internal structure of EHV disconnector chamber.