Sumitomo Electric Industries, Limited

Other

The Tokyo Electric Power Company, Incorporated

Jun Fujikami

Kenichi Sato

Takeshi Kato

Hideo Ishii

Kazuya Ohmatsu

Nobuhiro Shibuta

Tsukushi Hara

Nobuhiro Saga

Shoichi Honjo

Naoki Ayai

Toru Okazaki

Takato Masuda

Hidehito Mukai

Yoshihisa Takahashi

Tetsuyuki Kaneko

Kimiyoshi Matsuo

Tomoo Mimura

Yoshihiro Iwata

Hiroyasu Yumura

Shinichi Kobayashi

Shuji Hahakura

Teruo Matsushita

Soji Otabe

A method of manufacturing a superconducting wire includes the step of drawing a wire formed by coating raw material powder for a superconductor with a metal (S), the step of first rolling (S) rolling a multifilamentary wire after the step of drawing (S), and the step of first sintering (S) sintering the multifilamentary wireafter the step of the first rolling (S). At least one of an interval between the step of drawing (S) and the step of the first rolling (S) and an interval between the step of the first rolling (S) and the step of the first sintering (S) is less than seven days. With this method, a superconducting wire having high and uniform performance can be obtained.

Method of manufacturing superconducting wire

A method of manufacturing a superconducting wire includes the step of drawing a wire formed by coating raw material powder for a superconductor with a metal, the step of first rolling a multifilamentary wire after the step of drawing, and the step of first sintering the multifilamentary wireafter the step of the first rolling. At least one of an interval between the step of drawing and the step of the first rolling and an interval between the step of the first rolling and the step of the first sintering is less than seven days. With this method, a superconducting wire having high and uniform performance can be obtained.

A method of manufacturing a superconducting wire includes the step of drawing a wire formed by coating raw material powder for a superconductor with a metal or a wire with a multifilamentary structure, the step of sealing an end portion of a clad wire or a multifilamentary wire after the step of drawing, and the step of first rolling, rolling the multifilamentary wire after the step of sealing. With this method, a superconducting wire having high and uniform performance can be obtained.

Provided is a superconducting cable having a structure such that cable cores, each having a superconducting layer, are housed in a thermal insulation pipe and the superconducting layer of each cable core has portions having different critical current values. When an excessive current flows in the superconducting layer in case of a short-circuit failure, the current exceeds the critical current value of the portion having a smaller critical current value first, which results in damage to the portion, suppressing the occurrence of damage to the other normal portion. A superconducting cable line using this superconducting cable and a splitter for accommodating the cable cores therein is also provided.

Method of manufacturing a superconducting cable

A method of manufacturing a superconducting wire includes the step of drawing a wire formed by coating raw material powder for a superconductor with a metal, the step of first rolling rolling a multifilamentary wire after the step of drawing, and the step of first sintering sintering the multifilamentary wire after the step of the first rolling. The method further includes the step of holding a clad wire, a multifilamentary wire, or a multifilamentary wire under a reduced-pressure atmosphere in at least one of an interval between the step of drawing and the step of the first rolling and an interval between the step of the first rolling and the step of the first sintering.

Superconducting cable and superconducting cable line using the same

Oxide superconducting wire with reduced AC loss

Provided are an oxide superconducting wire which maintains a high critical current density and has a small current drift with small ac loss when the same carries an alternating current and a method of preparing the same, and a cable conductor which is formed by assembling such oxide superconducting wires. The oxide superconducting wire is a flat-molded stranded wire which is formed by twisting a plurality of metal-coated strands consisting of an oxide superconductor, and is characterized in that the flat-molded stranded wire has a rectangular sectional shape, and a section of each strand forming the flat-molded stranded wire has an aspect ratio (W1/T1) of at least 2. The method of preparing this oxide superconducting wire comprises the steps of preparing a stranded wire by twisting a plurality of strands, each of which is formed by metal-coating an oxide superconductor or raw material powder therefor, flat-molding the prepared stranded wire, and repeating rolling and a heat treatment of at least 800&deg; C. on the flat molded stranded wire a plurality of times.

Oxide superconducting wire

A superconducting cable includes a core material, conductor layers formed by means of helically winding superconducting wires around the core material, electrically insulating layers, and magnetic shielding layers formed by means of helically winding superconducting wires around each of the electrically shielding layers. The superconducting wire is wound at the shortest pitch on the outermost conductor layer and is wound at the longest pitch on the outermost magnetic shielding layer.

Superconducting cable and method of analyzing the same

The diameter of a first metal tube charged with raw material powder is reduced for obtaining an elementary wire. A plurality of such elementary wires are charged into a second metal tube, which in turn is reduced in diameter for obtaining a round first wire having a plurality of first filaments. The first wire is uniaxially compressed thereby obtaining a tape-like second wire having a plurality of second filaments. The second wire is heat treated thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments. The maximum grain size of the raw material powder is smaller than the minor diameter of the first or second filaments.

Method of preparing oxide superconducting wire

Provided is an insulated oxide superconducting cable conductor having a high critical current and a high critical current density. The insulated oxide superconducting cable conductor comprises an elongated former, a plurality of tape-shaped multifilamentary oxide superconducting wires which are wound on the former at a bending strain factor of not more than 0.5%, and a spirally wound tape-shaped insulating material covering the tape-shaped multifilamentary oxide superconducting wires. The tape-shaped multifilamentary superconducting wires are superposed on the former in layers, whereby stabilizing materials of the superposed superconducting wires are in contact with each other. The tape-shaped insulating material consists essentially of a material which is contracted at a thermal contraction rate of at least three times that of the tape-shaped multifilamentary wires by cooling from a temperature of 298 K to that of 77 K. The tape-shaped insulating material can apply a pressure to the superposed multifilamentary superconducting wires toward the former while improving electrical contact between the superposed multifilamentary superconducting wires by cooling in employment. The former can be formed of a flexible tube.

High TC superconducting cable conductor employing oxide superconductor

Method of preparing oxide superconductive wire

An oxide superconducting stranded wire having inter-strand insulation and high critical current is provided. A wire including an oxide superconducting material and a matrix covering the material and consisting essentially of silver or a silver alloy is coated with a paint containing, as a main component, an organometallic polymer such as a silicone polymer or aluminum primary phosphorus in a paint reservoir, and the paint is baked in a baking furnace via a drying furnace. A plurality of such wires with the baked paint are twined into a stranded wire, which is then heated up to a temperature necessary for sintering the oxide superconducting material. The stranded wire thus obtained through the step of sintering may have high critical current. A heat-resisting insulating coating layer may be formed by baking the paint.

Methods of manufacturing oxide superconducting stranded wire and oxide superconducting cable conductor, and coated wire, stranded wire and cable conductor

Provided is an oxide superconducting conductor consisting of a plurality of metal-covered multifilamentary superconducting wires which are assembled with each other. Bending is applied to the superconducting conductor for improving its critical current density. It is possible to obtain a compact superconducting conductor having higher capacity, since its critical current density is increased by such application of bending.

Method of preparing an oxide superconducting conductor

In order to provide a flexible oxide superconducting cable conductor which is reduced in ac loss, tape-shaped multifilamentary superconducting wires covered with a stabilizing metal are spirally wound on a flexible former. Each of the multifilamentary superconducting wires has a plurality of filaments. The filament contains an oxide superconductor. The superconducting wires are preferably wound on the former at a bending strain of not more than 0.3 %. In winding on the former, a prescribed number of tape-shaped multifilamentary superconducting wires are wound on a core member in a side-by-side manner, to form a first layer. Then, an insulating layer is provided on the first layer. This insulating layer can be formed by an insulating tape. A prescribed number of tape-shaped superconducting multifilamentary wires are wound on the insulating layer in a side-by-side manner, to form a second layer. The insulating layer is adapted to reduce ac loss of the conductors. When the former is made of a metal, it is more preferable to provide an insulating layer between the former and the multifilamentary superconducting wires.

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Osaka, Japan

Jun Fujikami