基于等效热路的GIS母线动态热模型研究  

Equivalent Heat Circuit Based Dynamic Thermal Model for GIS Bus Bars

作　　者：汪军衡 张改杰[1] 夏雨潇[1] 张扬[2] 

机构地区：[1]国网湖北省电力公司孝感供电公司,湖北孝感432000 [2]武汉大学电气工程学院,湖北武汉430072

出　　处：《陕西电力》2013年第12期35-39,共5页Shanxi Electric Power

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

摘　　要：建立了126 kV三相共箱武GIS母线等效热路模型,由于母线等效热阻与热容等集总参数未知,直接求解微分方程较为困难。采用有限元模型计算母线导体、SF6气体以及外壳的温升时间常数,通过数值拟合方法得出母线负荷电流与稳态温升的对应关系,尝试利用单个指数函数模拟母线各组件的温升过程。与不同负荷条件下有限元温升过程计算结果的对比表明,所提出的模型能够有效计算GIS母线正常运行条件下的温升过程。Equivalent thermal circuit model of 126 kV three-phase enclosed GIS bus bar is established in this paper. Direct solution of the differential equations is rather difficult to obtain because of the unknown lumped parameters of equivalent thermal resistances and capacitors. The finite element method （FEM） thermal model is employed to calculate the time constants of the conductors, the SF6 gas and the tank. The relationship between the steady-state temperature rise and the load current of the GIS bus bar is also established. A single exponential function is tried to model the temperature rise process in the bus bar. The comparison between the FEM and calculated results shows that in the conditions of both step and time varying load currents the conductor and tank temperatures can be fast and accurately calculated with the proposed dynamic thermal model.

关 键 词：GIS母线 等效热路 有限元 温升过程 

分 类 号：TM564[电气工程—电器]