基于多物理场耦合的气体绝缘母线触头接触温升有限元计算  

Finite Element Analysis of Contact Temperature rise in Gas Insulated Busbars based on Coupled Multi-physics

作　　者：孙国霞[1,2] 舒乃秋[2] 吴晓文[2] 谢志杨[1] 金向朝[1] 彭辉[2] 

机构地区：[1]广东电网公司佛山供电局,佛山528000 [2]武汉大学电气工程学院,武汉430072

出　　处：《电工技术学报》2013年第S2期408-413,共6页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金资助项目(2012207020208)

摘　　要：触头接触温升与气体绝缘母线的运行状态以及可靠性密切相关。建立了气体绝缘母线三维涡流场分析模型计算母线各部分原件的功率损耗,并将其作为热载荷输入流场以及温度场有限元分析模型,计算出了母线温度场分布。为了模拟接触电阻且不影响母线温度场分布情况,合理简化了触头结构。基于计算流体力学理论,采用多组分传输方法计算母线内外不同气体的对流换热问题,避免了反复迭代求解对流换热系数。考虑了接触电阻以及气体热物性参数随温度变化的特性。多物理场耦合计算结果与实测值的对比结果表明了接触电阻简化的合理性以及母线温升计算模型的有效性。所提出的模型对于母线触头过热状态监测提供了方法和依据。Contact temperature rise is closely relative with the operation condition and reliability of gas insulated busbars(GIB).Three-dimensional(3-D) eddy-current field model is established to calculate the power losses in the conducting components of GIB.As the heat source input,the power losses are used for the finite element analysis of fluid and thermal fields and the temperature distribution in GIB is obtained.In order to model the contact resistance and not to change the temperature distribution,the structure of contacts is properly simplified.Based on computational fluid dynamics(CFD),the multiple species transport technique is employed to calculate the convective heat transfer of different gases both inside and outside GIB,eliminating the iterative calculation of convective heat transfer coefficient.The temperature dependent contact resistance and thermal properties of gases are considered in the model.The reasonability of the simplification of contact resistance and the effectiveness of the coupled multi-physics method are validated with the comparison between the calculated and tested results.The proposed model will provide methodology and reference for overheat condition monitoring of GIB.

关 键 词：气体绝缘母线 接触电阻 多组分传输 涡流场 温度场 多物理场耦合 

分 类 号：TM645.11[电气工程—电力系统及自动化]