Abstract
Roebel cables are a promising solution for high current, low AC loss cables made ofhigh-temperature superconductors in the form of coated conductors. High current createssignificant self-field, which influences the superconductor’s current-carrying capability. Inthis paper, we investigate the influence of the self-field on the cable’s critical currentand the current repartition among the different strands. In order to investigatethe cable’s critical current, we analysed the influence of flux creep on the cableproperties. Using the experimental material’s properties derived from measurementson a single conductor as input for our calculations, we were able to predict thecritical current of the cable in two limiting situations: good current sharing andcomplete electrical insulation among the strands. The results of our calculations showgood agreement with the measured critical current of three Roebel cable samples.
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