AC Losses in First and Second Generation High Tapes and Tapes

Technical and economical assessments for future power applications of High superconductivity require the evaluation and comparison of AC losses in first and second generation high tapes. An electrical and a thermometric method were developed and used to measure transport AC loss in OPIT Bi-2223/Ag tapes, Y-123 coated conductors and in new -based superconductors, simulating the AC conditions typical of power devices. The results were compared with analyt- ical models for AC losses calculation. The effect of the magnetic substrates used in coated conductors was also investigated and a simple calculation model was proposed.