Development of Bi-2223 superconducting wires for AC applications

Advanced silver sheathed Bi-2223 superconducting tapes have been developed for AC-applications such as electric power cables and transformers, which require reduced AC-losses. Twisted multi-filament and inter-filament resistive barriers were applied to eliminate the electromagnetic inter-filament coupling, which is the primary mechanism in enhancing AC-losses. A multi-filamentary wire with a honeycomb type thin ceramic barrier was designed and manufactured in an attempt to realize low AC-losses without degrading the transport properties of the conductor. AC-losses of the manufactured wire were reduced drastically when compared to those of conventional wires without barriers. Using the measured properties of the manufactured wire as a basis, a design study along with projected AC-losses for a superconducting power cable is presented.