气体绝缘输电线路温升数值计算及相关因素分析  

Temperature Rise Numerical Calculation and Correlative Factors Analysis of Gas-Insulated Transmission Lines

作　　者：吴晓文[1] 舒乃秋[1] 李洪涛[1] 李玲[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072

出　　处：《电工技术学报》2013年第1期65-72,共8页Transactions of China Electrotechnical Society

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

摘　　要：气体绝缘输电线路(GILs)的温升计算对于其可靠性设计与运行状态监测具有重要意义。为了提高GIL温升计算的精度,建立了包含外部空气在内的GIL电磁场、流体场以及温度场耦合计算的有限元模型。迭代计算了与温度相关的焦耳热损耗,并将其按照单元映射方式耦合至温度场进行温升计算。采用多组分传输理论将SF6气体与空气的物性参数进行线性组合,实现了单一模型中存在不同流体时的换热分析。利用该模型研究了运行电流与环境温度对GIL温升的影响。对比了是否考虑气体非线性热物性参数以及变化表面对流换热系数时的温升计算结果。通过实验验证了有限元计算结果的正确性,该模型与结论为GIL设计与导体运行温度监测提供了可靠的理论依据。Investigation of temperature rise calculation of gas-insulated transmission lines(GILs) is critical for the reliability design and operation monitoring.To improve the calculation accuracy of GIL temperature,the finite-element model coupling electromagnetic field,fluid field and thermal field is established,in which the ambient air is also included.Iterative method is used to calculate temperature dependent Joule losses,which are coupled to thermal analysis with element mapping.Multiple species transport technique is employed and the properties of insulating gas and air are combined linearly to realize heat transfer analysis of different fluids in single model.With the proposed model,influence of operation current and ambient temperature on GIL temperature rise is analyzed.Moreover,the effects of the nonlinear thermal physical parameters and the variation of convective heat transfer coefficient are also examined.Concordance between the predicted temperature and experimental results in the literature validates the accuracy of the model.The results provide the correctness as theoretical references for GIL design and temperature monitoring of the conductor.

关 键 词：气体绝缘输电线路 温升计算 有限元 多组分传输 热物性参数 对流换热系数 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]