Nexans

Erik Marzahn

Mark Stemmle

Nicolas Lallouet

Rainer Soika

Frank Schmidt

Arnaud Allais

Sébastien Delplace

Michele Di Palma

Beate West

Christian Eric Bruzek

An end closure for a superconductive electric cable which has at least one superconductive conductor which is surrounded by a tubular cryostat serving for conducting a cooling agent, which at its end is surrounded by a housing. The housing (G) has two walls () which are separated from each other by an intermediate space () and having insulating material, wherein a thermal insulation containing gas is placed in the intermediate space. The pressure in the intermediate space () of the housing (G) is adjusted to a value of between 10mbar and 1000 mbar and, connected to the intermediate space () are a pressure measuring device () and a vacuum pump () which serve for adjusting the pressure prevailing in the intermediate space () of the housing (G).

End closure of a superconductive electric cable

A method for constructing a superconductive cable system is proposed. Using this method, at least one superconductive cable () is mounted in a tubular cryostat () serving for guiding a cooling agent by means of which the cryostat () equipped with the cable () and wherein the cable () and the cryostat () are transported to the placement location and both ends are connected to units. The cable () is mounted in a cryostat () which at both axial ends () protrudes beyond the cable (). The unit of cable () and cryostat () is transported to the placement location. The ends () protruding beyond the cable () are cut to a predetermined length. The superconductive cable () and the cryostat () are subsequently connected to the units.

Method and arrangement for constructing a superconductive cable system

A method is provided for manufacturing a superconductive cable equipped with means for compensating length changes caused by temperature changes which occur when the cable is cooled from room temperature to work temperature and vice-versa. A superconductive cable (SK) with a tubular, central carrier () is used which is surrounded by at least one superconductive conductor. Arranged in the carrier () is at least one tension-proof strand () arranged over the entire length of the carrier (). Cable (SK) is initially wound, including strand (), at room temperature onto a coil (SP). Subsequently, the strand () is immovably fastened to the two ends of the cable (SK) and the cable (SK) is subsequently wound off the coil (SP).

Method of manufacturing a superconductive cable

A termination unit () for a superconducting cable (), has an internal electrically insulating envelope () containing the phase conductors (A,B,C) of the cable () in a cryogenic fluid. The internal envelope () has, for each phase conductor (A,B,C), one first electrical connector (A,B,C) connected to the corresponding phase conductor (A,B,C) and protruding from the internal envelope (). The termination unit () further has an electrically conductive, grounded casing () surrounding the internal envelope () and the first electrical connectors (A,B,C), the grounded casing () comprising one bushing (A,B,C) for each one of the first electrical connectors (A,B,C), each bushing (A,B,C) being connected to one of the first electrical connectors (A,B,C) by a second electrical connector (A,B,C) and being adapted to transmit voltage and current from its associated phase conductor (A,B,C).

Termination unit for a superconducting cable

A method of cooling at least one superconductive cable is disclosed which is arranged in a cryostat having at least one thermally insulated pipe with a free space surrounded by the pipe, wherein the cable and at least one tubular structure are arranged in the free space, and wherein a cooling agent is conducted through the free space from a feeding point located at one end to a distal end. The cooling agent is conducted through the cryostat and the tubular structure exclusively in one direction of the cable until it reaches its temperature of operation and is discharged to the outside at the distal end. After reaching the temperature of operation, the cooling agent is returned from the distal end of the arrangement through the tubular structure to the feeding point.

Method of cooling a superconductive cable

An arrangement is provided at least one superconductive cable () and a first cryostat (K). A second cryostat (K) is provided, formed coaxially with and at a distance from the first cryostat (K). Arranged in the intermediate space () between the first cryostat (K) and the second cryostat (K) is a high voltage resistant insulation () which completely surrounds the outer pipe () of the first cryostat (K), and which rests on the latter, where liquefied gas conducted during the operation of the arrangement flows through the intermediate space () around the insulation and impregnates the insulation.

Arrangement with at least one superconductive cable

A superconductive electrical direct current cable with at least two conductors insulated relative to each other is indicated, where the cable is placed with at least two conductors insulated relative to each other, where the conductors are arranged in a cryostat suitable for guidance of the cooling agent, wherein the cryostat is composed of at least one metal pipe which is surrounded by a circumferentially closed layer with thermally insulating properties. In the cryostat is arranged a strand-shaped carrier composed of insulating material, where the carrier has at least two diametrically oppositely located outwardly open grooves in each of which is arranged one of the conductors. Each conductor is composed of a plurality of superconductive elements.

Superconducting direct-current electrical cable

An arrangement for electrically conductively connecting two electrical units by means of a bipolar high voltage direct current transmission, in which between the units are arranged at least two electrical direct current cables constructed as superconductive cables. The superconductive cables are mounted separately from each other in a cryostat () suitable for conducting a cooling agent which has at least one metal pipe provided with a thermal insulation. The cryostats () are connected with at least one of their ends to a cooling plant () supplying the cooling agent and a pipeline () is placed parallel to the two cryostats (). The pipeline () is connected at both its ends to the two cryostats () through valves () which are closed during uninterrupted operation and, in the case of an interruption at one of the superconductive cables, the pipeline () serves with the then open valves for conducting the cooling agent intended for the cryostat of the impaired cable.

Arrangement for electrically conductively connecting two electrical units

An arrangement with a superconductive electrical direct current cable system is specified which includes at least one direct current transmission element () composed of two phase conductors which are insulated relative to each other, and a cryostat suitable for conducting a cooling agent, in which the direct current cable system is arranged. The cryostat is composed of at least one metal pipe which is surrounded by a circumferentially closed layer with thermally insulating properties. Each of the two phase conductors () is composed of several superconductive elements () which are combined into a unit. Between the two phase conductors () is mounted a separating layer () of insulating material, and the two phase conductors (), including the separating layer () are surrounded by a sheath () of insulating material for forming a direct current transmission element ().

Arrangement with a superconductive electrical direct current cable system

A method of managing thermal contraction of a superconductor cable () having a cable body surrounded by an external screen (A) made form wound metal elements and installed between its ends in an enclosure () or cryostat filled with a cryogenic liquid, where the method includes mechanically applying a locking force loading only said screen (A) at a so-called locking point (A,B) in the vicinity of the ends of the cable.

Method of managing thermal contraction of a superconductor cable and arrangement for implementing this method

A superconductor cable is described, having a superconductive flexible cable core () , which is laid in a cryostat (), in which the cable core () runs in the cryostat () in the form of a wave or helix at room temperature.

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Langenhagen, Germany

Erik Marzahn