Current distributions and AC transport losses for simple parallel conductor composed of Ag-sheathed (Bi,Pb)-2223 multifilamentary tapes

Alternating-current (AC) transport lasses in self-fields at 77K have been i nvestigated for simple parallel coinductors composed of several pieces of A g-sheathed (Bi,Pb)-2223 multifilamentary tapes with different filament arra ngements. The loss values of the conductors depend on the filament arrangem ent in the tape strand and the arrangement of tape strands in conductors, a lthough the main contribution to the losses comes from the hysteresis loss in the superconductor. The conductors composed of tape strands with section ed filament arrangements have lower losses than those without sectioned fil ament arrangements, because the field-free core in the former is sectioned into some parts in the filament group. Improvement for the tape arrangement in the conductor, together with a functional design for the filament arran gement in tape strands, is important to suppress the loss generation in cab le conductors under AC current transmission.