Abstract: A superconducting transformer may include two pairs of axially extending windings. The windings are each in the form of a right cylindrical solenoid having a circular cross-section which are substantially concentrically nested. Each winding includes a plurality of turns formed from superconducting tape. Each winding respectively includes a first end and a second end which are configured for electrical connection with at least one of the other ends, an alternating power source, a load, or other passive or active electrical components. The transformer includes a first axially extending primary winding corresponding to the outermost winding and a first axially extending secondary winding nested within the first primary winding. A second axially extending primary winding is nested within the first secondary winding. A second axially extending secondary winding is nested within the second primary winding such that the second secondary winding corresponds to the innermost winding.

Abstract: A composite superconducting tape including a multiplicity of constituent superconducting tapes stacked parallel to one another with major faces in contact, and at least some of constituent tapes have widths not greater than half the width of the composite superconductor and are laid edge to edge with each other. All constituent superconducting tapes may have a width that is substantially half, or another simple fraction, of the width of the composite tape so that they form two or more substacks with aligned zones between them which contain no superconducting material. A full-width tape of silver or silver alloy to bridge from tape to tape provides sufficiently strong mechanical connection between substacks. The composite superconducting tape has substantially improved critical current compared with a stack of the same overall dimensions and composition with all full-width superconducting tapes, due to magnetic de-coupling between the substacks.

Abstract: A superconducting transformer includes two pairs of axially extending windings (1, 2, 3 and 4). The windings are each in the from of a right cylindrical solenoid having a circular cross-section which are substantially concentrically nested. Each winding (1, 2, 3 and 4) includes a plurality of turns formed from superconducting tape. Each winding respectively includes a first end and a second end (5 and 6, 7 and 8, 9 and 10, and 11 and 12) which are configured for electrical connection with at least one of the other ends, and alternating power source (13), a load (14), or other passive or active electrical components. The ampere turns of a first pair of the windings (1 and 3), is substantially the same as the ampere turns of a second pair of the windings (2 and 4).

Abstract: Production of a superconducting tape of the powder-in-tube type comprising multiple filaments (1) of superconducting material embedded in a silver matrix (2) having the properties of a filament thickness of less than about 40 ?m and an overall tape thickness in the range from about 0.45 mm to 1.20 mm. A superconducting power cable including a tubular copper former (3) defining a cooling duct (4) about which superconducting tape is helically laid in two layers of either the same or opposite hand. The cable further includes thermal insulation (5), an electrical screen (6), electrical insulation (7), a further electrical screen (8) and containment (9).

Abstract: A superconducting transformer may include two pairs of axially extending windings. The windings are each in the form of a right cylindrical solenoid having a circular cross-section which are substantially concentrically nested. Each winding includes a plurality of turns formed from superconducting tape. Each winding respectively includes a first end and a second end which are configured for electrical connection with at least one of the other ends, an alternating power source, a load, or other passive or active electrical components. The transformer includes a first axially extending primary winding corresponding to the outermost winding and a first axially extending secondary winding nested within the first primary winding. A second axially extending primary winding is nested within the first secondary winding. A second axially extending secondary winding is nested within the second primary winding such that the second secondary winding corresponds to the innermost winding.

Abstract: A Winding for high voltage transformer having a predetermined number of spaced winding groups joined to form a single winding transformer, each spaced winding group being solenoid wound from a predetermined number of turns. A method of forming the winding and a transformer including the winding are also disclosed.

Abstract: A composite superconducting tape including a multiplicity of constituent superconducting tapes stacked parallel to one another with major faces in contact, and at least some of constituent tapes have widths not greater than half the width of the composite superconductor and are laid edge to edge with each other. All constituent superconducting tapes may have a width that is substantially half, or another simple fraction, of the width of the composite tape so that they form two or more substacks with aligned zones between them which contain no superconducting material. A full-width tape of silver or silver alloy to bridge from tape to tape provides sufficiently strong mechanical connection between substacks. The composite superconducting tape has substantially improved critical current compared with a stack of the same overall dimensions and composition with all full-width superconducting tapes, due to magnetic de-coupling between the substacks.

Abstract: A superconducting transformer includes two pairs of axially extending windings (1, 2, 3 and 4). The windings are each in the from of a right cylindrical solenoid having a circular cross-section which are substantially concentrically nested. Each winding (1, 2, 3 and 4) includes a plurality of turns formed from superconducting tape. Each winding respectively includes a first end and a second end (5 and 6, 7 and 8, 9 and 10, and 11 and 12) which are configured for electrical connection with at least one of the other ends, and alternating power source (13), a load (14), or other passive or active electrical components. The ampere turns of a first pair of the windings (1 and 3), is substantially the same as the ampere turns of a second pair of the windings (2 and 4).

Abstract: Production of a superconducting tape of the powder-in-tube type comprising multiple filaments (1) of superconducting material embedded in a silver matrix (2) having the properties of a filament thickness of less than about 40 &mgr;m and an overall tape thickness in the range from about 0.45 mm to 1.20 mm. A superconducting power cable including a tubular copper former (3) defining a cooling duct (4) about which superconducting tape is helically laid in two layers of either the same or opposite hand. The cable further includes thermal insulation (5), an electrical screen (6), electrical insulation (7), a further electrical screen (8) and containment (9).