Low-field-orientation effect on REBCO tape performance and its power cable application

Low field characteristics, including field orientation dependence relations for four different commercially available REBCO tapes, were investigated in an external field of up to 0.3 T at 77 K. A design method of the performance of a twisted stacked-tape conductor (TSTC) has been developed for a power transmission line. Cable critical current is obtained from an averaged self-field distributed over the cable cross section and the minimum critical current obtained from the field orientation dependence in transverse fields experimentally measured for the single tapes. The performance of three types of TSTCs, i.e., single-, double-, and triple-channel configurations, has been assessed for the four REBCO tapes.本研究在77 K、外磁场最高达0.3 T的实验条件下，对四种商用稀土钡铜氧（REBCO）带材的低场特性（含磁场取向依赖关系）开展了系统探究。针对输电线路应用，研发了堆叠绞合带材导体（twisted stacked-tape conductor, TSTC）的性能设计方法：电缆临界电流可通过分布于电缆横截面的平均自场计算得到，而最小临界电流则基于单根带材在横向磁场中实测得到的磁场取向依赖关系求得。针对上述四种REBCO带材，对单通道、双通道及三通道三种构型的TSTC的性能进行了评估。