油浸式变压器三维电磁-流体-温度场耦合分析方法  

Comprehensive analysis of 3-D electromagnetic-fluid-thermal fields of oil-immersed transformer

作　　者：廖才波[1] 阮江军[1] 刘超[1] 文武[1] 王珊珊[2] 梁嗣元[2] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074

出　　处：《电力自动化设备》2015年第9期150-155,共6页Electric Power Automation Equipment

基　　金：国家重点基础研究发展计划(973计划)项目(2011-CB209404);国家自然科学基金资助项目(50977066)~~

摘　　要：提出了一种基于有限元法和有限体积法的变压器三维电磁-流体-温度场耦合分析方法。通过建立变压器三维模型,采用有限元法分析变压器内磁通密度分布,并求得变压器及绕组损耗。将变压器铁芯及绕组损耗作为热源,采用有限体积法求解变压器流体-温度场,分析变压器内部油流及温度分布,同时根据温度场结果对变压器损耗进行修正,通过迭代求解变压器流体-温度场获取变压器内部最终温度分布结果,提高求解精度。采用所提方法对35 k V油浸式变压器进行三维电磁-流体-温度场分析,将结果与经验公式的热点温度计算结果进行对比,验证了所提方法的有效性和正确性。A method based on the finite element method and the finite volume method is proposed to comprehensively analyze the 3-D electromagnetic-fluid-thermal fields of transformer. Based on the 3-D transformer model,the finite element method is applied to analyze the magnetic flux density distribution inside the transformer and obtain the core and winding losses,with which as the heat sources,the finite volume method is then applied to obtain the fluid-thermal field for analyzing the oil flow and temperature distributions inside the transformer. In order to improve the accuracy of solution,the transformer losses are revised according to the temperature distribution and the fluid-thermal field is iteratively solved to obtain the final temperature distribution inside the transformer. The 3-D electromagnetic-fluid-thermal fields are analyzed by the proposed method for a 35 k V oil-immersed transformer and the results are compared with the hot-spot temperatures calculated by the empirical formula,which verifies the correctness and effectiveness of the proposed method.

关 键 词：变压器 有限元法 有限体积法 多物理场耦合 流体-温度场分析 电磁场 温度 油浸式变压器 

分 类 号：TM41[电气工程—电器]