Energy loss in YBCO-123 coated conductor due to AC/DC transport current and AC external perpendicular magnetic field

Abstract

In the paper we present experimental results of power losses measurements in a YBCO-123 coated conductor carrying a DC (or AC) transport current when subjected simultaneously to an external AC magnetic field. Two kinds of measurements were carried out; the first was AC transport current losses as a function of the current amplitude and the AC external magnetic field (“AC–AC” case); the second was dynamic resistance losses versus DC transport current and the AC external magnetic field (“DC–AC” case). Additionally, for both cases the magnetization losses were measured. The increase of the AC transport current loss due to the AC external magnetic field in the full saturation regime is described well with the dynamic resistance effect. This makes it possible to replace the AC transport current measurement in AC applied magnetic field with the much more simple dynamic resistance loss measurement when the total AC loss has to be determined.