外场因素对高温超导堆叠带材交流损耗的影响  

Influence of external field factors on AC loss of HTS stacked tapes

作　　者：梁瑞[1] 岳磊文 周文海 侍世杰 贾荣礼 曹佳峰 Liang Rui;Yue Leiwen;Zhou Wenhai;Shi Shijie;Jia Rongli;Cao Jiafeng(School of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China;Department of applied mathematics,Lanzhou University of Technology,Lanzhou730050,China)

机构地区：[1]兰州理工大学石油化工学院,兰州730050 [2]兰州理工大学应用数学系,兰州730050

出　　处：《低温与超导》2023年第9期21-30,共10页Cryogenics and Superconductivity

基　　金：国家自然科学基金(11901264);甘肃省青年科技基金(22JR5RA303)资助。

摘　　要：REBCO高温超导带材在传输电流时会产生交流损耗,从而影响超导设备的稳定运行。基于麦克斯韦方程组,结合超导体的非线性E-J关系,使用H方法推导求解超导体交流损耗的数值计算公式,利用COMSOL Multiphysics有限元仿真软件建立二维轴对称模型并进行计算。结果表明,在通入交变电流后,超导带材由于抗磁性会出现部分零磁通区域,随着传输电流幅值、磁通蠕变系数、频率及环境温度的增大,磁通穿透深度逐渐增大,零磁通区域逐渐减小,传输电流主要分布于带材两端。增大传输电流幅值、磁通蠕变系数以及环境温度中任一变量,交流损耗随之增大,而交流损耗随频率的增大而减小。合理选取超导带材参数可有效降低交流损耗,保障超导设备安全运行。REBCO high-temperature superconducting(HTS)tapes will produce AC loss when transmitting current,which will affect the stable operation of superconducting equipment.Based on Maxwells equations,the numerical formula for solving the AC losses of superconductors was derived using the H-method,which combined the nonlinear E-J relationship of superconductors.A two-dimensional axisymmetric model was established and calculated by COMSOL Multiphysics finite element simulation software.The results show that after the alternating transfer current is applied,a part of the zero flux region appears in the superconducting strip due to antimagnetism.With the increase of the transfer current amplitude,flux creep coefficient,frequency and ambient temperature,the flux penetration depth gradually increases and the zero flux region gradually decreases,and the transfer current is mainly distributed at both ends of the strip.When the any variables of amplitude of alternating transmission current,n value and ambient temperature are increased,the AC loss increases.However,the AC loss decreases with increasing frequency.Reasonable selection of superconducting tape parameters can effectively reduce AC losses and ensure the safe operation of superconducting equipment.

关 键 词：H方法 交流损耗 交变电流 磁通穿透深度 

分 类 号：TM154[电气工程—电工理论与新技术]