变压器磁热耦合计算与局部过热屏蔽措施  

Magnetic-thermal coupling calculation and shielding measure of local overheating for transformer

作　　者：李岩[1] 额尔和木巴亚尔 张霄霆[2] 井永腾[1] 李晓辉[1] 

机构地区：[1]沈阳工业大学特种电机研究所 [2]沈阳工业大学电气工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2012年第4期366-371,共6页Journal of Shenyang University of Technology

基　　金：辽宁省高校创新团队资助项目(LT2010080)

摘　　要：针对大型电力变压器涡流损耗及局部过热问题,采用三维有限元涡流场计算得出变压器油箱及夹件的涡流损耗及其分布,进一步采用磁热耦合方法计算出油箱和夹件温度场分布以及热点温度.在此基础上,分析局部过热问题,找出最热点并采取相应磁屏蔽来降低油箱和夹件涡流损耗及热温升,分析了磁屏蔽结构尺寸对油箱及夹件涡流损耗和最热点温度的影响.采取磁屏蔽措施后,油箱和夹件涡流损耗及热点温度明显降低,有效防止了局部过热现象,为电力变压器的优化设计提供了参考依据.In order to solve the problems concerning both eddy current loss and local overheating in large power transformer, the three-dimensional （3D） finite element calculation of eddy current field was adopted to obtain the eddy current loss and its distribution for the fuel tank and clamps of transformer, and a magnetic-thermal coupling method was used to calculate the temperature field distribution and hot spot temperature of the fuel tank and clamps. And thus, the local overheating problem was analyzed, and the hottest spot was found out. In addition, the corresponding magnetic shielding was applied to reduce the eddy current loss and temperature rise of the fuel tank and clamps. Finally, the influence of the size of the magnetic shielding structure on both eddy current loss and hottest spot temperature of the fuel tank and clamps was analyzed. After adopting the magnetic shieding measure, the eddy current loss and hot spot temperature of the fuel tank and clamps decrease significantly, and the local overheating phenomenon is prevented efficiently, which can provide the references for the optimization design of power transfomler.

关 键 词：电力变压器 温度场 涡流损耗 局部过热 磁热耦合 磁屏蔽 有限元法 热点温度 

分 类 号：TM401[电气工程—电器]