The Furukawa Electric Co., Ltd.

International Superconductivity Technology Center

Central Research Institute of Electric Power Industry

Yokohama National University

International Superconductivity Technology Center, the Juridical Foundation

International Superconductivity Center, the Juridical Foundation

Shinichi Mukoyama

Masashi Yagi

Tokui Yonemura

Tomoya Nomura

Yuh Shiohara

Hirao Hirata

Misao Sakano

Takashi Shimano

Hiroshi Suzuki

Mitsuo Suzuki

Teruo Izumi

Toshihiro Takahashi

Takaharu Mitsuhashi

Kazutomi Miyoshi

Michiharu Ichikawa

Hirokazu Tsubouchi

Jun Teng

Taro Matsuoka

Naoyuki Amemiya

A cryogenic cable termination connector having a small heat inflow from the outside and stable electrical insulation properties. The cryogenic cable termination connector includes a lead-out conductor led out from a site at a very low temperature to a site at room temperature via a liquid refrigerant layer, a refrigerant gas layer, and an oil layer. The lead-out conductor includes a capacitor-cone insulator in which plural metal foils for dividing an electric field from a high voltage level down to the ground voltage level are stacked through an insulator. Among electric field tilting portions in which voltage changes gradually from the high voltage level to the ground voltage level, an electric field tilting portion positioned at a lower part is located in the liquid refrigerant layer and an electric field tilting portion positioned at an upper part is located in the oil layer.

Cryogenic cable termination connector

In a superconducting cable line in which a superconducting cable is connected to a terminal connecting part or an intermediate connecting part, an offset part in which a superconducting cable is laid in a curved-shape is provided near the terminal connecting part or the intermediate connecting part. Further, when it is assumed that the superconducting cable is movable in the offset part, an external tube of the superconducting cable is fixed such that a maximum amplitude part which maximizes the amount of movement of the superconducting cable following thermal expansion and contraction of a cable core becomes immovable.

Superconducting cable line

A terminal connecting part has: a low temperature container filled with a cooling medium; a conductor current lead which has one end immersed in the cooling medium and the other end led to a normal temperature part; and a conductor movable connecting terminal which electrically connects a superconductive conductor layer and the conductor current lead of a superconducting cable. The superconductive conductor layer of the superconducting cable stripped stepwise from a front end is connected to the conductor current lead through the conductor movable connecting terminal. The cable core of the superconducting cable is movable in a longitudinal direction and is rotatable in a circumferential direction while maintaining electrical connection between the superconductive conductor layer and the conductor current lead. The cable core is horizontally supported in the low temperature container.

Terminal connecting part of superconducting cable

A fixation structure for fixing a superconducting cable including a cable core and a thermal insulation tube. The fixation structure includes a fixation box connected to the thermal insulation tube, including a hollow thermal insulation structure, and through which the cable core is passed, a fixation body for fixing the cable core on the inner wall of the fixation box, and a diameter-expanded reinforcement layer that is an electrical insulation layer that has a diameter decreasing toward both ends and is formed on the cable core. A refrigerant flows through the inside of the inner wall of the fixation box. The cable core is fixed on the inner wall with the fixation body through the diameter-expanded reinforcement layer. The structure implements a simple and low-cost fixation structure appropriate for an electric field design.

Fixation structure of superconducting cable and fixation structure of superconducting cable line

An AC superconducting cable with an insulating layer on the external circumference of a conductor, and wherein: the insulating layer includes a first insulating layer, a second insulating layer and a third insulating layer, from the inside layer to the outside layer; the insulating layer is impregnated with liquid nitrogen; the product of the dielectric constant &#x2208;of the first insulating layer and the dielectric loss tangent tan &#x3b4;and the product of the dielectric constant &#x2208;of the second insulating layer and the dielectric loss tangent tan &#x3b4;fulfilling the relationship &#x2208;&#xd7;tan &#x3b4;&#xd7;tan &#x3b4;; and the product of the dielectric constant &#x2208;of the second insulating layer and the dielectric loss tangent tan &#x3b4;and the product of the dielectric constant &#x2208;of the third insulating layer and the dielectric loss tangent tan &#x3b4;fulfilling the relationship &#x2208;&#xd7;tan &#x3b4;&#xd7;tan &#x3b4;

Superconducting cable

In a terminal structure of a superconducting cable conductor, a terminal portion of the superconducting cable conductor is connected with a terminal member of a good conductor. The terminal portion includes a superconducting layer disposed on an outer periphery of a central support; and an insulating layer surrounding the superconducting layer. The insulating layer and the superconducting layer are partially removed to expose the central support and the superconducting layer in this order from an end of the superconducting cable conductor. The terminal member includes a metal sleeve which includes a first cylindrical portion whose inner surface is in close contact with an exposed portion of the central support; a second cylindrical portion which is soldered around an exposed portion of the superconducting layer; and a third cylindrical portion into which the insulating layer is inserted.

Terminal structure of superconducting cable conductor and terminal member used therein

A superconducting wire having at least a superconducting thin film and a stabilizing film formed one on top of another in order on a substrate having a predetermined width and a predetermined length, the superconducting wire having at least one cut made along a direction of the length of the superconducting wire, the superconducting wire being bendable at the cut in a width direction.

Superconducting wire, superconducting conductor, and superconducting cable

A current terminal structure of a superconductor has a former, and a superconducting wire wound around the former in one or more layers and including a substrate and a superconducting layer formed on the substrate. A first layer superconducting wire wound around immediately above the former is arranged so that a substrate side thereof becomes outside and a superconducting layer side thereof becomes inside. A surface of the superconducting layer at an end of the first layer superconducting wire, which is directed toward the inside, and part of a surface of the superconducting layer of a connection superconducting wire, which is directed toward the outside, are faced and connected to each other.

Current terminal structure of superconducting wire and superconducting cable having the current terminal structure

A thin film superconductive wire material () and an electro conductive tape () are immersed in a solder bath () containing a solder, which includes Sn(tin) and Bi (bismuth), to bond the thin film superconductive wire material () and the electro conductive tape () and a composite superconductive wire material () is formed.

Composite superconductive wire-material, manufacturing method of composite superconductive wire-material, and superconductive cable

When supplying electric power to a superconducting cable including a superconducting shield covering a superconductive conductor, a phase A of a current generated by a magnetic field leaking from the superconducting shield and a phase B of a current passing through the superconductive conductor are detected, and a phase difference between the phase A and the phase B is obtained so as to determine that a quench has occurred in the case where a difference between a reference phase difference and the obtained current phase difference exceeds a threshold.

Quench detection method and apparatus of superconductive conductor

A superconducting cable for alternating current, comprising conductor layers formed by a plurality of tape-shaped superconducting wires wound around a center member, an electric insulating layer formed outside the conductor layers, and a plurality of shielding layers formed outside the insulating layer, wherein, the conductor layers are formed, where N is a number of layers in the conductor layers and expressed by an integer, by gradually increasing a winding pitch of conductor layers in the same direction from an inner first layer to an N/2 layer when the number of layers is even, or from an inner first layer to a (N&minus;1)/2 layer when the number of layers is odd, and then by gradually decreasing a winding pitch of conductor layers in an opposite direction to the inner layers from a N/2&plus;1 layer to an N layer when the number of layers is even, or from a (N&plus;1)/2 layer to an N layer when the number of layers is odd.

Superconducting cable for alternating current

Superconducting accelerating tube comprised of half-cells connected by

A superconducting accelerating tube which is constructed in a manner such that a plurality of components, formed of a superconducting material and individually having peripheral end portions adapted to be butted to one another, are butted to one another at the peripheral end portions, and the butting portions butted to one another are welded together. In the superconducting accelerating tube according to the present invention, the butting portions are welded by means of a laser beam, and the laser beam is applied to the butting portions so that the components are laser-welded to one another. Preferably, the accelerating tube is designed so that at least only the respective inner surfaces of the butting portions are laser-welded, and the depth of welding is not greater than half the thickness of the superconducting material and not smaller than 150 .mu.m.

Growing community of inventors

Tokyo, Japan

Shinichi Mukoyama