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US 4,611,390 AGranted
Method of manufacturing superconducting compound stranded cable
AssigneeFurukawa Electric Co., Ltd.
InventorsYasuzo Tanaka, Yoshio Furuto
Life of this patent
Estimating the term…
Abstract
A superconducting compound cable which comprises a plurality of strands each having therein at least one filament of a superconducting compound material in the lengthwise direction of the strand, said strands being of an elliptical or flat shape in cross section, arranged in layers and stranded at a predetermined pitch in the axial direction of the cable, and the total cross-sectional area of all the strands in the cable being more than 50 percent of that of the rectangle or trapezoid circumscribed about the periphery in a cross section of the cable.
Claims43
A method for the production of a superconducting compound cable which comprises the steps of:
- (a) stranding a plurality of strands to provide a stranded assembly having a hollow portion along and inside the stranded assembly, at least one of said strands including a component capable of forming a superconducting compound in the form of filament by a diffusion heat treatment,
- (b) reducing the cross section of the stranded assembly by drawing said stranded assembly through a drawing dies to such a reduction rate that the arciform length in cross section of two interfaces formed by contact between one strand and two adjacent strands falls within the range of 20% to 70% of the perimeter of the strand,
- (c) with a flattening device shaping the reduced stranded assembly to eliminate the hollow portion previously provided therein and to cause said assembly to have a quadrilateral shape in cross section to such a reduction rate that the total cross-sectional area of all the strands accounts for more than 50% of that of a quadrilateral circumscribed about the periphery of said assembly, and
- (d) heating the shaped assembly at a temperature at which a superconducting compound material is formed in the strands.
1 more element
A method of joining a cable to a superconducting cable made by the following process:
- (a) stranding a plurality of strands to provide a stranded assembly having a hollow portion along and inside the stranded assembly, at least one of said strands including a component capable of forming a superconducting compound in the form of filament by a diffusion heat treatment,
- (b) reducing the cross section of the stranded assembly by drawing said stranded assembly through a drawing dies to such a reduction rate that the arciform length in cross section of two interfaces formed by contact between one strand and two adjacent strands falls within the range of 20% to 70% of the perimeter of the strand,
- (c) with a flattening device shaping the reduced stranded assembly to eliminate the hollow portion previously provided therein and to cause said assembly to have a quadrilateral shape in cross section to such a reduction rate that the total cross-sectional area of all the strands accounts for more than 50% of that of a quadrilateral circumscribed about the periphery of said assembly, and
- (d) heating the shaped assembly at a temperature at which a superconducting compound material is formed in the strands;
- said method including setting a prescribed length of superconducting compound cable section made by the aforementioned process between the cable and conductor being joined for indirect junction thereof with both ends of said superconducting compound cable contacted with the corresponding ends of said two cables being joined.
2 more elements
A method of joining a conductor having ends to a superconducting cable made according to the following process:
- (a) stranding a plurality of strands to provide a stranded assembly having a hollow portion along and inside the stranded assembly, at least one of said strands including a component capable of forming a superconducting compound in the form of filament by a diffusion heat treatment,
- (b) reducing the cross section of the stranded assembly by drawing said stranded assembly through a drawing dies to such a reduction rate that the arciform length in cross section of two interfaces formed by contact between one strand and two adjacent strands falls within the range of 20% to 70% of the perimeter of the strand,
- (c) with a flattening device shaping the reduced stranded assembly to eliminate the hollow portion previously provided therein and to cause said assembly to have a quadrilateral shape in cross section to such a reduction rate that the total cross-sectional area of all the strands accounts for more than 50% of that of a quadrilateral circumscribed about the periphery of said assembly, and
- (d) heating the shaped assembly at a temperature at which a superconducting compound material is formed in the strands;
- said method including overlapping an end of said superconducting cable on a corresponding end of said other conductor;
- boring overlapped portions with a hole;
- inserting small superconducting rods into said hole;
- heating the assembled portion at a higher temperature than that at which at least one selected from the group consisting of the superconducting cable and the conductor are heated;
- forming at least one selected from the group consisting of a different kind of superconducting compound and a superconducting solid solution in the interfaces of said superconducting rods;
- and solidifying the entire joined portion by cooling.
7 more elements
Dependencies are inferred from the claim text.