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

Alternating-current (AC) transport losses in self-fields at 77 K have been investigated for simple parallel conductors composed of several pieces of Ag-sheathed (Bi, Pb)-2223 multifilamentary tapes with different filament arrangements. The loss values of the conductors depend on the filament arrangement in the tape strand and the arrangement of tape strands in conductors, although the main contribution to the losses comes from the hysteresis loss in the superconductor. The conductors composed of tape strands with sectioned filament arrangements have lower losses than those without sectioned filament 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 arrangement in tape strands, is important to suppress the loss generation in cable conductors under AC current transmission.