Study on AC loss of stacked REBCO cable wrapped with magnetic strip

REBCO stacked cables have great potential for application in high-temperature superconducting (HTS) power devices due to their compact structure and easy scalability. However, when the cable runs in an alternating external field, it will generate AC losses, and excessive AC losses will increase the cooling cost and even cause the cable quench. This article proposes a magnetic material wrapped REBCO cable that can effectively reduce the AC loss of the cable under external magnetic fields. Firstly, the AC losses of REBCO cables wrapped with magnetic and non-magnetic materials were compared under different strength external fields. The results showed that cables wrapped with strong magnetic materials had lower AC losses. Secondly, the AC losses of cables prepared with strong magnetic wrapping materials of different thicknesses were studied under different external fields. The results showed that the thicker the magnetic material, the more significant the reduction in AC losses of the cable. Overall, this article presents new analysis and results that are useful for future design of HTS cables.