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

Masashi Yagi

Shinichi Mukoyama

Tomoya Nomura

Takaharu Mitsuhashi

Tokui Yonemura

Tomohiro Takagi

Hirao Hirata

Jun Teng

Hiroyuki Fukushima

Yuh Shiohara

Taro Matsuoka

Hiroshi Suzuki

Mitsuo Suzuki

Teruo Izumi

Kiyoshi Yamamoto

Toshihiro Takahashi

Hideyuki Hatakeyama

Toshiaki Amano

Shinya Yasunaga

Michiharu Ichikawa

Norio Matsui

Ryo Nakayama

Makoto Furukawa

Ryou Nakayama

Jin Liu

Naoyuki Amemiya

A transportation pipe includes a main-body vacuum insulated pipe, a central pipe, and a connecting vacuum insulated pipe. The main-body vacuum insulated pipe including a double pipe structure includes a vacuum part in a region between an inner pipe and an outer pipe. The central pipe through which a fluid to be transported flows, is arranged in the main-body vacuum insulated pipe. The connecting vacuum insulated pipe having a double pipe structure includes a vacuum part in a region between an inner pipe and an outer pipe. In a state in which two main-body vacuum insulated pipes are inserted into the connecting vacuum insulated pipe from respective ends of the connecting vacuum insulated pipe, ends of the main-body vacuum insulated pipes are away from one another, and the main-body vacuum insulated pipes are connected to one another via the connecting vacuum insulated pipe.

Transportation pipe

A double tube is provided, which can reliably prevent buckling and flattening of an inner tube even when bending is performed.

Double tube

In order to obtain a heating and cooling system capable of localized cooling or heating a given area, a heating and cooling system includes: a supply section configured to supply a heating medium; and a double pipe unit including: an inner pipe, connected to the supply section, through which the heating medium flows, and an outer pipe disposed at an outer peripheral side of the inner pipe, the outer pipe including a space between the inner pipe and the outer pipe, the space being maintained at a vacuum, portions in which a degree of vacuum of the space is different, or in which the degree of vacuum of the space is adjustable.

Heating and cooling system

A connection structure is provided for a pair of superconducting cables each including a cable core including a former and a superconductive conductor layer composed of a plurality of superconducting wires arranged along an outer circumference of the former. The superconducting wire has a laminated structure including a base plate and a superconducting layer formed on a side closer to one of principal surfaces of the base plate. One of the superconducting cables and another of the superconducting cables are connected with each other by a first superconducting wire and a second superconducting wire such that the superconducting layers of the first superconducting wire and the second superconducting wire face each other.

Connection structure of superconducting cables, superconducting cable, and electrical terminal structure of end portion of superconducting cable

In order to obtain a highly versatile superconducting cable capable of absorbing differences in thermal contraction amounts that arise between three members, these being a cable core, an inner tube, and an outer tube, and to obtain a superconducting cable manufacturing method of the same, a superconducting cable includes a thermal insulation vacuum tube and a cable core. The thermal insulation vacuum tube includes an inner tube fixed at both ends and having a cooling medium filled inside, and an outer tube disposed at an outer peripheral side of the inner tube with a space between the outer tube and the inner tube maintained at a vacuum, and is configured to include a winding section wound with one or more turns. The cable core is fixed at both ends and disposed inside the inner tube.

Superconducting cable and superconducting cable manufacturing method

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 superconducting wire connection structure comprises a first superconducting wire and a second superconducting wire, ends of which are arranged across from each other, and a third superconducting wire which spans and connects the first superconducting wire and the second superconducting wire along a longitudinal direction of the first superconducting wire and the second superconducting wire. Each of the first superconducting wire, the second superconducting wire and the third superconducting wire is a tape-shaped superconducting wire which includes a substrate laminated with at least a superconductive layer. The third wire is narrower in at least one portion than the first superconducting wire and the second superconducting wire.

Superconducting wire connection structure, superconducting wire connection method, and connection superconducting wire

Superconducting wire material, superconducting wire material connection structure, superconducting wire material connection method, and treatment method of superconducting wire material end are shown. According to one implementation, a superconducting wire material connection structure includes, a first superconducting wire material, a second superconducting wire material, and a third superconducting wire material. The first superconducting wire material and the second superconducting wire material each include an end provided with a concave section in which at least a superconducting layer is removed and a filling section in which filling material is filled in the concave section. The first superconducting wire material and the second superconducting wire material are positioned so that the ends oppose to each other. A third superconducting wire material is connected to both the first superconducting wire material and the second superconducting wire material.

Superconducting wire material, superconducting wire material connection structure, superconducting wire material connection method, and treatment method of superconducting wire material end

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 connection structure for superconducting cables includes: superconducting cables that are connected to each other and include cable cores containing formers and superconducting conductor layers, and each cable core is housed in a thermal insulation tube with a cooling medium, wherein the cable cores include electric insulating layers obtained by winding insulating sheets around the superconducting conductor layers, the electric insulating layers on both sides of a conductor connecting part, in which the formers and the superconducting conductor layers are connected to each other, include taper shape portions each having a diameter reducing towards the conductor connecting part, each taper shape portion is formed so as to have an inclination angle changing in a stepwise fashion by a plurality of tapered portions among which a tapered portion nearer the conductor connecting part has smaller inclination angle, and a reinforcing insulating layer is provided between the taper shape portions.

Connection structure for superconducting cables

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

In an intermediate connecting unitof superconducting cables, by forming the connecting superconducting wiresin a trapezoid shape tapered in the direction of the electric insulating layer(the superconducting shield layers) sides from the large radius sectionside of the reinforcement insulating layer, the inclined surface sectionscan be covered without spaces and without the plurality of connecting superconducting wires overlapping. The plurality of connecting superconducting wirescover the inclined surface sectionsof the reinforcement insulating layerformed thicker than the radius of the cable coresof the superconducting cables. The connecting superconducting wiresfurther connects the superconducting wiresarranged on the outer periphery of the large radius sectionof the reinforcement insulating layerand the superconducting wiresconstituting the superconducting shield layers

Intermediate connection unit of superconducting cables

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.

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Tokyo, Japan

Masashi Yagi