Critical current and AC loss analysis of a superconducting power transmission cable with ferromagnetic diverters

Superconducting transmission cables are important for increasing the capability of electricity networks. We analysed monolayer power transmission cable based on high-temperature superconductors, and we propose a new way to improve its performance in this paper. We studied two important parameters of this cable-critical current and AC loss. For the former parameter, the dependence of the critical current density on the local magnetic field is very important. For the latter parameter, the direction of the magnetic field penetration also has a substantial influence. We propose placing ferromagnetic diverters above the gaps between individual superconducting tapes. Ferromagnetic components placed in this position influenced both the critical current density and the AC loss in the superconductor in a positive way. We used a numerical model for magnetic field analysis, and we also prepared a 0.5 m long sample of the cable for experimentation. Our experimental results confirmed the correctness of the basic idea. The critical current of the cable was increased by 14%. However, the AC loss measurement showed differences between the experiment and the calculation.