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Investigation on AC Losses of a Quasi-Isotropic Strand Made From REBCO Coated Conductors

With the development of REBCO coated conductor (REBCO CC), high-temperature superconducting (HTS) strand with high current capacity and quasi-isotropic performance is expected to have widely potential applications. The alternating current (AC) loss is always one of the most important characteristics in AC HTS applications. This paper aims to perform research of AC losses of quasi-isotropic strand consisting of REBCO CCs by theoretical analysis and experiment. The electromagnetic characteristic of the strand is simulated. Then, the finite-element method is used to calculate AC losses. Based on the analysis of magnetic field distributions of the REBCO CCs, different theoretical models are introduced to calculate AC losses of the strand. To verify this model, AC losses of the strand are calculated and compared with the measured results.