三相油浸变压器新型磁路设计与性能分析  

Magnetic circuit design and performance analysis for three-phase oil-immersed transformer

作　　者：井永腾[1] 王欢[1] 李岩[1] JING Yong-teng;WANG Huan;LI Yan(National Engineering Research Center for REPM Electrical Machines,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学国家稀土永磁电机工程技术研究中心,沈阳110870

出　　处：《电机与控制学报》2019年第3期26-33,共8页Electric Machines and Control

基　　金：国家自然科学基金(51877140);辽宁省高校创新团队支持计划(LT2017003)

摘　　要：针对目前国内三相油浸式变压器磁路结构不科学的问题,提出引进国外变压器器身的屏蔽结构,同时结合国内现有的屏蔽结构,研制出新型三相油浸式变压器磁路结构。基于三维有限元计算和热流密度数值分析方法,建立变压器磁—热耦合数学分析模型,计算与分析采用该新型磁路结构变压器的漏磁场,并对变压器内金属结构件磁密、损耗和温升进行计算和分析。最后,通过样机温升实验定量分析新结构对热点温升的影响。通过计算与分析可以得到,该新型磁路结构简化了器身的设计,减少了产品生产材料的种类,同时,不仅消除了局部过热的隐患,也降低了生产成本。研究表明,采用物理场数值模拟与实验研究比对相结合的方法开展变压器磁路设计具有理论意义和工程实际意义。Aiming at the unscientific structure of three-phase oil-immersed transformer magnetic circuit at current,a new three-phase oil-immersed transformer magnetic circuit structure was developed by introducing the shielding structure of foreign transformer bodies and combining with the existing shielding structure in China.Based on the three-dimensional finite element numerical calculation and thermal flux analysis method,the transformers magnetic-thermal coupling mathematical model was set up,the leakage magnetic field,metal structure flux density,loss and temperature rise of the new magnetic circuit structure of transformer were calculated and analyzed and the influence of new structure was analyzed on hot spot temperature rise by prototype test.Through calculation and analysis,it can be obtained that in the new magnetic structure the design of the active part is simplified and the types of production materials is reduced.At the same time,the hidden danger of local overheating is eliminated,and the production cost is reduced.The research shows that it has theoretical and practical significance to carry out transformer magnetic circuit design by combining physical field numerical simulation with experimental research.

关 键 词：变压器 磁路结构 磁-热耦合 损耗分布 热点温升 

分 类 号：TM41[电气工程—电器]