Dependence of dynamic resistances in high-temperature semiconducting quasi-isotropic strands on magnitude and orientation of AC magnetic field

Abstract

Dynamic resistance of superconductor appears if it carries DC current and is simultaneously exposed to AC magnetic fields if their amplitude is higher than its full penetrated field. Due to its strong anisotropy, dynamic resistance of HTS tape is not only affected by magnitude of AC magnetic fields but also their orientations. Particularly, the dynamic resistance has considerable effect on current distribution in HTS cables (except for Roebel cable) or even CICC made from those HTS cables except of dissipative loss. This paper presents behavior of dynamic resistance in high temperature superconducting (HTS) Quasi-isotropic strand (Q-IS), which consists of four sub-stacked 2G HTS tapes proposed by our group in North China Electric Power University (NCEPU) while it carries DC current and simultaneously experiences an AC magnetic field with different magnitudes and orientations. A angular dpendence of dynamic rsistance in a single 2G HTS tape in AC magnetic field with various orientatons is firstly performed in simulation and experiment, respectively. The experimental results are good agreement with the simulated ones, which shows that the dynamic resistance of a Q-IS exhibits also quasi-isotropic characteristics and has important effect on distribution of DC transport current. The related results are promising for designs and applications of other DC HTS cables, feeders or magnet.