Speaker
Description
Limited by filament size, the dimensions of Rare-earth Barium Copper Oxide (ReBCO) cables are usually comparable to the width of the constitutive tape strands. Resultantly, the distribution and redistribution of currents amongst strands can have a strong impact on the behaviors of the cable, including current-voltage characteristics and in-field performance. In this study, we present a modeling framework coupling a three-dimensional periodic finite-element model based on the T-A formulation with an electrical circuit considering terminal resistances through inductive and resistive voltages and strand currents. On a 4-layer CORC$^{®}$ cable, we first demonstrate the dynamics of current redistribution and voltage profiles considering nonuniform strand critical currents and unequal terminal resistances. Then we examine the behaviors of the cable in a background field, which help to understand the effects of layer-to-layer shielding and in-field cable performances. Finally, we discuss the practical implications for the effective use of voltage signals for quench detection.
