电力变压器漏磁场与杂散损耗计算的研究  

Research of Leakage Magnetic Field and Stray Loss Calculation in Power Transformer

作　　者：李龙女[1] 李岩[1] 井永腾[1] 张博[1] 

机构地区：[1]沈阳工业大学特种电机研究所,沈阳110870

出　　处：《电工技术学报》2013年第S2期122-127,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51177103);辽宁省高校创新团队支持计划(LT2011002)资助项目

摘　　要：针对电力变压器漏磁场和杂散损耗计算以及局部过热的问题,笔者采用三维非线性涡流场有限元方法对一台电力变压器进行了漏磁场及杂散损耗的计算与分析。应用MagNet有限元分析软件计算得到变压器油箱及夹件的杂散损耗及损耗密度分布,为了克服杂散损耗以及损耗密度过大引起的局部过热问题,对变压器采取屏蔽措施,并分析屏蔽对变压器杂散损耗、损耗密度以及漏磁场的影响。分析结果表明,通过实际变压器与TEAM Problem 21基准族模型验证了本文所采用损耗计算方法的计算值与测量值的误差在2%以内,从而验证了计算分析的正确性;采取屏蔽措施后变压器油箱和夹件的杂散损耗分别降低了38%和48.9%。Leakage magnetic field,stray loss calculation and local overheating introduce great challenge for the power transformers,however,which need to be analyzed.In this paper,a 3D nonlinear finite element method is adopted to calculate and analyze the leakage magnetic field and stray loss of an actual power transformer.The stray loss and loss density distribution in tank wall and yoke clamps are calculated by MagNet FEM software.In order to overcome local overheating problem caused by excessive stray loss and loss density,magnetic shields are taken to the transformer and the effect of magnetic shields to the stray loss,loss density and leakage magnetic field of transformer are analyzed.The validity and effectiveness of the analysis is verified by calculation of the actual transformer and TEAM Problem 21 family.The results shows that the calculated value closely match the measured value,whose error is just less than 2%;with magnetic shields,the stray losses of transformer tank and yoke clamp decrease 38% and 48.9%.

关 键 词：局部过热 磁屏蔽 杂散损耗 损耗密度 漏磁场 有限元法 

分 类 号：TM41[电气工程—电器]