堆叠扭转高温超导复合导体的交流损耗仿真研究

Simulation Study on AC Loss of Twisted-Stacked High Temperature Superconducting Composite Conductor

基于麦克斯韦方程组,使用H法结合超导体的非线性E-J关系,采用有限元软件,对2种堆叠扭转复合导体的交流损耗进行三维仿真研究,并对窄化堆叠导体的交流损耗进行了研究.通过计算得到,当外部CORC导体交叉堆叠时,复合导体的传输损耗较小;当外部CORC导体同向堆叠时,复合导体的磁化损耗较小.窄化可以有效地降低堆叠复合导体的传输交流损耗,外部窄化CORC导体交叉堆叠时,内部窄化TSTC导体的排列方式,会影响窄化堆叠复合导体传输交流损耗的大小.当外磁场大于或等于0.015 T时,窄化可以降低复合导体的磁化交流损耗,且内部窄化TSTC导体的排列方式,会影响窄化复合导体的磁化交流损耗的大小.

Based on the Maxwell’s equations,3D H-formulation combined with nonlinear E-J power law was used to simulate the AC loss of two twisted-stacked composite conductors by finite element method.The AC loss of narrowed twisted-stacked composite conductors was also studied. Based on the calculation results,it can be seen that the AC loss of the composite conductor will be smaller,when the outer CORC conductor is crossed-stacked. The magnetization AC loss of the composite conductor will be smaller,when the outer CORC conductor is stacked in the same direction. The transport AC loss of the twisted-stacked composite conductor can be effectively reduced by narrowing the tapes. The arrangement of the inner narrowed TSTC conductor will influence the transport AC loss of the narrowed stacked composite conductor,when the outer narrowed CORC conductor is crossed-stacked. The magnetization AC loss of the composite conductor can be reduced by narrowing the tapes,when the external magnetic field is equal or greater than0. 015T. In addition,the arrangement of the inner narrowed TSTC conductor will influence the magnetization AC loss of the narrowed composite conductor.