Summary
This paper investigates current redistribution within non-insulating REBCO tape-stack cables, demonstrating that natural current sharing between tapes with different critical currents can prevent premature quenching in high-field applications. Circuit modelling indicates that as individual tapes approach their critical current, resistive effects cause current to naturally redistribute to neighbouring tapes with higher carrying capacity. The authors are developing a multi-scale model to characterise the dynamics and limits of this current-sharing mechanism under varying magnetic field and critical-current density conditions.
Key measures
Dynamic resistance in superconducting layers near critical current; critical current per tape as a function of local magnetic field; transverse electric field between adjacent tapes; current redistribution patterns; stability limits under load
Outcomes reported
The study examined current redistribution mechanisms in non-insulating REBCO tape-stack cables under increasing current, measuring dynamic resistance and critical current limits. A multi-scale model was developed to characterise current-sharing dynamics, stability limits, and the impact of critical-current density fluctuations.
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