环境因素影响下气体绝缘输电线路温升过程数值模拟  

Numerical Simulation of Transient Heat Transfer Characteristics of Gas-insulated Transmission Lines Influenced by Environment Factors

作　　者：吴晓文[1] 李洪涛[1] 李玲[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《陕西电力》2013年第7期1-6,共6页Shanxi Electric Power

基　　金：国家重点基础研究发展计划资助项目(973项目)(2009CB724500)

摘　　要：为了全面了解气体绝缘输电线路(Gas-insulated Transmission Lines,GILs)的温升特性,基于计算流体力学原理,建立了GIL流体场以及温度场耦合有限元分析模型,给出了求解域内相应的假设条件与边界条件,利用该模型分别分析了变化环境温度、风速以及日照等环境因素作用下GIL的温升变化过程,在分析过程中迭代计算等效表面对流换热系数或热流密度边界。将温升过程的计算结果与实测结果进行对比分析,结果表明不同运行环境下GIL的温升特性存在一定差异,结论对于了解复杂运行条件下GIL的温升变化特点提供了方法和依据。For further knowledge of temperature rise characteristics of gas-insulated transmission lines （GILs）, based on computational fluid dynamics （CFD） principle, finite-element model （FEM） coupling fluid field and thermal field is established, in which the corresponding assumptions and boundary conditions are given. The model is employed to analyze the transient temperature rise characteristics of a GIL under the complex conditions of variable ambient temperature, wind and solar radiation. In the iterative analysis, process equivalent surface convection heat transfer coefficient and heat flux boundary conditions are updated. The calculation results are validated against experimental value, which indicates that the temperature rise characteristic is dissimilar from different operation environment. The conclusion can provides method and theory basis for the knowledge of transient temperature rise characteristics of GILs in complex operation conditions.

关 键 词：气体绝缘输电线路 有限元 暂态温升过程 对流换热系数 热流密度 

分 类 号：TM715[电气工程—电力系统及自动化]