Measured-loss analysis of superconducting power transmission cable

In the former work (see T.Hoshino et al., ibid., vol.9, no.2, pp.1277-80, 1999), the eddy current loss in the former due to pitch difference between current conductor and shield conductor was studied. The calculated value was negligible small which does not explain the measured value. The eddy current loss due to radial component of the magnetic field become comparable with the measured value. In this paper, the reason of the increased loss is revealed. The disturbance of the conductor pitch yields different strength of the axial magnetic field. The difference of the axial flux toward the radial direction as the radial component of the flux. The flux causes eddy current loss in the copper for stabilizer. It is well match with the measured value.