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AC losses reduction

The losses could be reduced by increasing the resisitivity of the metal matrix and by twisting the bi-2223 filaments. With round/square wires, smaller twist pitches than for flat tape can be obtained without damage to the filaments.

Different square Bi,Pb(2223) wires with and without barriers SrZrO3 were prepared by two-axial rolling technique. The ac losses in several series of square wires were measured, and the results showed that there are considerably lower ac losses at 50Hz compared to the standard flat Bi(2223)/Ag tapes in a perpendicular magnetic field.

The AC losses in the square wires are considerably smaller than in flat tapes, due to the small aspect ratio(1:1) of square wires.

Reported by

University of Geneva
24, quai Ernest-Ansermet
1211 Genève
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