基于屏蔽罩开孔的GIS隔离开关温度场散热优化设计  

Heat dissipation optimization design for temperature field of GIS disconnecting switch based on shield opening

作　　者：陈世萍 丛浩熹 李庆民[1] CHEN Shi-ping;CONG Hao-xi;LI Qing-min(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《电工电能新技术》2020年第5期74-80,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金项目(51737005);国家高技术发展研究计划(863计划)项目(2011AA05A121)。

摘　　要：GIS设备触头过热会引发重大事故,因此研究其内部温度场散热优化对GIS设备的设计和运行具有重要意义。以实际单相GIS隔离开关为例,采用有限元分析法建立了二维电磁热流耦合场仿真模型。在综合考虑辐射散热、气体对流、涡流损耗和重力加速度因素的基础上,分别针对不同的屏蔽罩结构设计方案,分析了GIS内部温度场分布特点。研究结果表明,对于平放的GIS设备,在相同半径处顶部温度高,底部温度低,且呈现左右对称分布的特点。由于筒内SF6气体对流散热较强烈,内部的SF6气体呈现弯曲的S状分布。屏蔽罩开孔并不能减小热源,但对加快气体自然对流散热、减小内部导体温升具有显著的效果。采用对称结构对屏蔽罩开孔,GIS内部最大场强低于实际圆环形屏蔽罩,且低于工程击穿场强值,不会引起电场畸变而造成局部放电故障。在综合考虑散热效果和电场畸变程度下,提出一种基于对称开孔结构的屏蔽罩散热优化设计方案,可为GIS设备散热优化设计及其温度监测提供一定的参考价值。The overheating phenomenon of GIS contacts may cause major accidents. Therefore,it is important to study on the optimization of internal temperature field heat dissipation for the design and operation of GIS equipment. Taking the actual single-phase GIS disconnecting switch as an example,the two-dimensional electromagnetic heat flow coupled field simulation model was established by finite element analysis. On the basis of comprehensive consideration of factors such as radiative heat dissipation,gas convection,eddy current loss and gravity acceleration,the distribution characteristics of internal temperature field of GIS were analyzed for different shield structure design schemes. The research results indicate that,for the flat GIS equipment,the top temperature is higher than the bottom temperature at the same radius,and the characteristics are symmetrically distributed. As the convection heat dissipation of the SF6 gas in the cylinder is strong,the internal SF6 gas exhibits a curved S-shaped distribution.The opening of shield cannot reduce the heat source,but it has a significant effect on accelerating the natural convection heat dissipation of the gas and reducing the temperature rise of the inner conductor. By using a symmetrical structure to open the shield,the maximum electric field strength inside the GIS is lower than that of the actual circular shield and the engineering breakdown electric field strength,and will not cause electric field distortion as well as partial discharge failure. Finally,considering the heat dissipation effect and the degree of electric field distortion,a heat dissipation optimization design scheme based on symmetric opening structure was proposed,which can provide some reference value for heat dissipation optimization design and temperature monitoring of GIS equipment.

关 键 词：GIS 多场耦合 温度场 屏蔽罩开孔 有限元分析 

分 类 号：TM56[电气工程—电器]