基带材料对单层高温超导电缆模型交流损耗的影响

Influence of substrates in HTS wires on AC loss characteristics of cylindrical single layer conductors

高温超导(HTS)带材的基带可以改变带材的磁场分布,从而影响到带材的交流损耗。从实验和数值分析两个角度计算了不同高温超导带材的自场损耗,并分析了不同基带对带材自场损耗的影响。利用不同高温超导带材制作了多个单层高温超导电缆模型,并从磁性基带的角度分析了各模型的交流损耗特性。结果显示非磁性基带不影响带材的交流损耗。对于超导电缆模型而言,当磁性基带位于模型外侧时,模型外部空间不存在损耗磁通。此外BSCCO模型和YBCO模型的交流损耗特性相似,NY模型和YN模型的损耗相比前两个模型偏大。尤其在低电流区域,YN模型的交流损耗最大。

Substrates of high temperature superconductor （HTS） wires can change the magnetic field distribution of the wires,with the consequence that they can affect AC losses of the HTS wires. In this study,we first experimentally and m,merically evaluated self - field losses of the HTS wires, and investigated the influence of the substrates on their self - field losses. Next, various HTS cylindrical single layer conductors were prepared using different HTS wires. And their AC loss characteristics were discussed from the perspective of magnetic substrate. The main results show the non - magnetic materials in HTS wires do not affect their losses. For the cylindrical conductor,loss flux does not exist outside of the conductor when the magnetic substrate is located outside. Moreover, the AC losses of the BSCCO and YBCO conductors are quite similar, and the AC losses of the NY and YN conductors are larger than the losses of the other two conductors. Especially, the AC loss of the YN conductor is the greatest in the low current region.