Low alternating current (ac) loss superconducting cable

A low alternating current loss superconducting cable comprising a plurality of superconductor tapes, a portion of such tapes being individually positioned in a first layer around a longitudinal axis and extending longitudinally with such axis, gaps being present between the superconductive material in adjacent tapes of such first layer, and at least one second layer formed of a portion of such plurality of tapes each individually positioned in a second layer around a longitudinal axis and extending longitudinally with such axis, gaps being present between superconductive material in adjacent tapes of the at least one second layer, the superconductive material of the at least one second layer overlapping the gaps in the first layer.

A low alternating current loss superconducting cable, comprising a plurality of superconductor tapes, each tape being individually positioned in a first layer around a longitudinal axis and extending longitudinally with said axis, each tape in being located between two immediately adjacent tapes, one lateral edge of each tape underlapping one associated adjacent tape and the other lateral edge of each said tape overlapping the other associated adjacent tape, such that at least a minor portion of the superconductive part of the superconductor tape under or overlaps an associated adjacent tape.

A low alternating current loss producing superconductor cable comprising superconducting tape spirally wrapped in a gap free lapped configuration on an annular core.

A method of preparing a low alternating current loss superconducting cable comprising wrapping a cylindrical core section with at least one superconductor, such superconductor being positioned around the longitudinal axis of such core such that at least 1% of each winding of such superconductor around such core overlaps an associated adjacent winding.

A method of fabricating low current loss superconducting cables comprising winding a cable of superconducting tape around a core, where the superconducting cable comprises a plurality of superconductor tapes,

• individually positioning each tape in a first layer around a longitudinal axis and extending longitudinally with said axis,
• locating each tape between two immediately adjacent tapes, one lateral edge of each tape underlapping one associated adjacent tape and the other lateral edge of each said tape overlapping the other associated adjacent tape, such that at least a minor portion of the superconductive part of the superconductor tape under or overlaps an associated adjacent tape.

A three phase cable consisting of three low alternating current loss superconducting cables, such cable comprising a plurality of superconductor tapes, each tape being individually positioned in a first layer around a longitudinal axis and extending longitudinally with said axis, each tape in being located between two immediately adjacent tapes, one lateral edge of each tape underlapping one associated adjacent tape and the other lateral edge of each said tape overlapping the other associated adjacent tape, such that at least a minor portion of the superconductive part of the superconductor tape under or overlaps an associated adjacent tape.

A three phase cable consisting of three low alternating current loss superconducting cables, such cable comprising a plurality of superconductor tapes, a portion of such tapes being individually positioned in a first layer around a longitudinal axis and extending longitudinally with such axis, gaps being present between the superconductive material in adjacent tapes of such first layer, and at least one second layer formed of a portion of such plurality of tapes each individually positioned in a second layer around a longitudinal axis and extending longitudinally with such axis, gaps being present between superconductive material in adjacent tapes of the at least one second layer, the superconductive material of the at least one second layer overlapping the gaps in the first layer.