AC losses in BiPbSrCaCuO-2223/Ag multifilamentary tapes in conditions similar to those in superconducting transmission lines

Transport AC losses in BiPbSrCaCuO-2223/Ag multifilamentary tape with 19 fi laments were measured. The sample was 1.05 m long, wound in form of a helix with a gap between the tapes comparable with the tape width. Two different types of potential leads-tape following, axis following-with taps position ed in the centre of the tape were mounted on inner as well as outer surface of the helical sample. AC losses were measured at power frequencies by an electrical method using a lock-in nanovoltmeter. The influence of potential wires arrangement and the potential taps position on measured AC loss leve l and its frequency dependence was analysed. (C) 1998 Elsevier Science B.V. All rights reserved.