考虑边界磁密分级的节能型卷铁芯损耗计算方法  

Core Loss Computation of Energy-saving Wound Core Considering Divided Grades on Boundary Magnetic Flux Density

作　　者：张陈擎宇 周利军[1] 李沃阳 高仕斌[1] 王东阳[1] ZHANG Chenqingyu;ZHOU Lijun;LI Woyang;GAO Shibin;WANG Dongyang(College of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,成都611756

出　　处：《高电压技术》2023年第9期3927-3935,共9页High Voltage Engineering

基　　金：国家自然科学基金—高铁联合基金(U1834203);四川省科技计划—青年科技创新研究团队(2020JDTD0009).

摘　　要：铁芯损耗计算是节能型变压器优化设计阶段重点关注的内容。现有的分析方法往往只考虑了铁芯内涡流本身的去磁效应,而未顾及各个层级边界磁通密度分级的情况。对于大型卷铁芯,这种差异带来的电磁计算误差不可忽略。因此,需要增加对各级硅钢片边界磁通密度不均匀分布性质的讨论,以更好地服务于损耗计算。考虑了硅钢片晶粒取向、绝缘涂层的导磁性能,严格按照卷铁芯卷片分级构建了磁路网络,通过合理的近似方案得到了不同层级边界磁通密度的解析表达式,结合卷片数各异的有限元分析明确了截面边界磁通密度非均匀分布的演变规律,以此为标准,验证了所提分级磁路模型的有效性。最后,将磁路模型引入到实际节能型自耦变压器铁芯损耗的计算,对经典公式包含的磁通密度参数进行修正,并与空载损耗的测量值进行了对比,结果表明,参数优化后的损耗公式具有更高的计算精度,平均误差低于5%。The losses calculation of wound core is significant in the optimization design stage of energy-saving transformer.Only the demagnetization effect inside the lamination is taken into account on present analysis,in spite of the divided-grade phenomenon on boundary magnetic flux density.As for large-scale wound core,the computed error from this discrepancy is pretty prominent.Thus the non-uniform distribution on boundary flux density should be discussed to serve for electromagnetic computation better.In this paper,the grain-oriented property of electrical steel and the permeability of insulation coating are taken into consideration,and the magnetic circuit network is created in strict conformity with the core layers.Then the analytical expression describing the boundary flux densities in different layers is obtained by skillful approximations.The non-uniform distribution of boundary flux density in cross section is clearly analyzed by finite-element analysis from a variety of layers,and it is taken as a standard to verify the effectiveness of divided-grade magnetic circuit model.Finally,the proposed model is provided into the core losses computation of actual energy-saving autotransformer,where the magnetic quantity included in classical formula is modified.Comparison results with the measured values of core losses reveal that the proposed method has a more precision to calculate the losses than the classical formula,where the average error is less than 5%.

关 键 词：节能型卷铁芯 分级磁路建模 磁密非均匀分布 有限元分析 铁芯损耗计算 

分 类 号：TM40[电气工程—电器]