变压器杂散损耗计算中的局部表面阻抗建模方法  

Calculation Method of Stray Loss Based on Local Surface Impedance Boundary Modeling Method

作　　者：赵志刚[1,2] 温涛 Zhao Zhigang;Wen Tao(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin 300130,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300130 [2]河北省电磁场与电器可靠性重点实验室(河北工业大学),天津300130

出　　处：《电工技术学报》2020年第22期4699-4708,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51677052);省部共建电工装备可靠性与智能化国家重点实验室自主研究课题重点项目(ERIZZ2018002)资助。

摘　　要：该文基于表面阻抗理论对表面阻抗法在电力变压器导磁钢结构件(如油箱、铁心拉板等)杂散损耗计算中的实际应用展开研究。针对变压器杂散损耗工程计算中面临的多尺度、小透入深度问题带来的计算精度和计算效率不易兼顾的难题,综合考虑导磁钢构件的趋肤效应和三维杂散场分布特征,提出一种对趋肤深度区域和场量衰减区域分别进行边界条件处理的局部表面阻抗建模分析方法,实现了杂散损耗的有效计算;并以国际TEAM杂散损耗基准模型P21−B为研究对象搭建变压器杂散损耗测试系统,通过相应的实验研究和仿真分析发现,局部表面阻抗方法与常规有限元方法具有相当的计算精度,但从计算规模和计算时间角度分析,前者在保证计算精度的前提下可以显著节省计算资源,提高计算效率,具有较高的工程实用价值。This paper studies the practical application of surface impedance method in stray loss calculation of magnetic conductive steel components of power transformer,such as oil tank,core pull plate,etc.Due to the problems of multi-scale and small penetration depth in the calculation of stray loss of transformer,it is difficult to consider both calculation accuracy and calculation efficiency.In this paper,considering the skin effect and three-dimensional stray field distribution characteristics of the magnetic steel,a local surface impedance modeling and analysis method is proposed to deal with the boundary conditions of the skin depth region and the field attenuation region respectively,which realizes the effective calculation of stray loss.Taking the international TEAM P21−B model as the research object,the stray loss measurement system of transformer is built.The experiment and simulation show that the local surface impedance method has the same calculation accuracy as the finite element method,but from the perspective of calculation scale and time,the former can greatly save computing resources and improve calculation efficiency while guaranteeing the calculation accuracy,which has high engineering practical value.

关 键 词：表面阻抗法 杂散损耗 漏磁场 计算规模 

分 类 号：TM41[电气工程—电器]