DC V-I characteristics of a HTS tape for a 600kJ SMES in an Oblique external magnetic field

Abstract

The critical current and n-value of the HTS tape, which are important for the characteristic analysis of the 600kJ HTS SMES system, were studied, and based on the results of the study, the DC V-I characteristics of a model coil fabricated by the same HTS tape of a 500 m length conductor were analyzed. The result show that the measured critical current and n-value of the conductor for parallel field are constant in external magnetic fields less than about 0.2, whereas the characteristics decreased for the whole range of the oblique magnetic field. The critical current of the coil, which was calculated based on the results of the study on a short sample conductor, corresponded to the obtained value, which means that the critical current and n-value of a conductor for an oblique magnetic field in an arbitrary direction in the HTS SMES system can be estimated only by using the DC V-I characteristics of a short sample conductor for parallel and perpendicular magnetic fields.