超导电缆中螺旋形带材磁场的三维仿真

本文基于超导直流电缆应用,针对电缆中超导带材以螺旋形态缠绕于支撑管的情形,使用毕奥-萨伐定律对螺旋电流在空间任意点产生磁感应强度进行数值计算,并使用仿真软件COMSOL Multiphysics进行三维仿真。结合超导带材在外磁场下的临界电流特性,分析由此造成的电缆临界电流退化,发现在导体层带材根数相同、单根带材通流幅值相等的前提下,螺旋角度较大时磁感应强度垂直带材表面分量较小,临界电流衰减程度更小,更有利于超导电缆的稳定运行和载流能力的提升。

3D simulation of magnetic field of spiral tape in superconducting cable

Aiming at the fact that in the superconducting cable the superconducting tape was spirally wound around the sup porting tube, the magnetic field generated by the spiral current at any point in space was numerically deduced and simulated by COMSOL Multiphysics. The critical current degradation of the tape caused by the spiral current was further analyzed. It is found that the component of the magnetic field vertical surface of the tape is smaller when the helix angle is larger and the number of strips in the conductor layer is the same and the current carrying capacity of the single strip is the same. Combined with the criti cal current characteristics of the superconducting tape, it is more conducive to the enhancement of the current carrying capacity of the superconducting cable. The above results can provide a reference for the design of conductor layer of superconducting cable.