Abstract
The results are presented of a theoretical analysis of reasons for reduction of current carrying capacity in superconducting multi-strand cable with thermally insulated strands at linearly changing transport current of the cable. The voltage-current characteristics (VCC) of strands are assumed to be described by the exponential function independent variables of current density and temperature, and to diverge somewhat. The conditions of origination of thermomagnetic instabilities preceding the quench in the cable are determined by means of numerical solution of the set of transient equations of heat balance and circuits governing each strand temperature change in time and the current redistribution throughout inductively coupled strands. It is shown that the quench current of the cable decreases with an increase in the smoothness factor of a strand's VCC. For cables with a great quantity of strands, a tangible decrease of the cable quench current could be unavoidable even if the grade of a bare percentage of strands has been going downward, and the cable current carrying capacity normalized to the total number of strands could be wittingly less than that of one sound strand.
Published Version
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