Round-shaped Bi2223/Ag sheathed wires were developed to apply to AC superconducting apparatuses. Round high temperature superconductor wires are convenient to assemble into a twisted cable conductor to obtain homogeneous current distribution in the wires. We measured AC transport current losses in a round wire itself and a (6+1) assembled cable conductor. The experimental results showed that the AC transport current loss per one wire in the assembled conductor was larger than that in an isolated wire. Reason for this difference of the AC losses is discussed.
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