交流用Bi-2223バリア線材の開発

—交流平行横磁界下における磁化損失の低減—

抄録

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