Critical current and loss character of quasi-isotropic strands with resistance

Abstract

Abstract A quasi-isotropic strand has a central rotational symmetry structure which shows good isotropic performance on magnetization loss when the strand is subjected to an externally applied alternating magnetic field in various directions. This paper studies the critical current and ac loss character of quasi-isotropic strands by considering the resistance between tapes based on the minimum electromagnetic entropy production method. The quasi-isotropic strands show resistance dependence on critical current, transport loss, and magnetization loss. The resistance between tapes can increase the critical current without significant increases in the total loss. High-frequency excitation conditions do not increase the loss per cycle either. The results indicate that quasi-isotropic strands are highly suitable for power cables and other high-power applications.