Nexans

Mark Stemmle

Rainer Soika

Erik Marzahn

Beate West

Frank Schmidt

Nicolas Lallouet

Klaus Schippl

Stephan Lange

Sébastien Delplace

Michele Di Palma

Waldemar Pedde

A method is provided for setting up a transmission link for electrical energy, in which at least one superconductive cable and a cryostat surrounding the same are used, the cryostat having two metal tubes arranged concentrically in relation to one another, between which a vacuum insulation is provided. The ends of the cryostat in the assembled state as well as the superconductive cable located in the same are attached on fixed parts of the transmission link. At least at one end of the cryostat, there is gaplessly connected to the same a tube body which is bent by an angle of at least 180&#xb0; and likewise consists of two metal tubes arranged concentrically in relation to one another, between which a vacuum insulation is provided. The superconductive cable protruding from the cryostat is arranged in the tube body at room temperature in such a way that it runs at least in the direct proximity of the wall of the inner tube of the tube body that has the greater bending radius.

Method for setting up a transmission link for electrical energy

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

An arrangement for current limitation which is suitable for integration in a power supply serving network and which has a superconductive conductor, which is attached to at least one plate like support composed of insulation material. On the at least one support three separate from each other superconductive conductors in spiral form windings parallel to each other running to a separate connection is arranged on the phases of a three phase alternating current network. The support equipped with the phase conductors is built in to a container constructed as a cryostat.

Arrangement for current limitation which is suitable for integration into a power supply serving network

The invention specifies a termination () for a superconducting cable () which is arranged in a tubular cryostat, which serves for carrying a coolant, and has at least one electrical conductor. The termination () has an inner sheath (), in which one end of the cable () is arranged in a coolant, and an outer sheath (), wherein the sheaths () are composed of electrically insulating material and insulating material is arranged in an existing intermediate space () between the inner and the outer sheath. The inner sheath () is connected to the cryostat, and the termination () is arranged vertically in the assembly position such that a lower part (C) of the inner and the outer sheath () is connected to earth and an upper part (A) of the inner and the outer sheath () is connected to high-voltage potential in the operating state. At the respective upper end, the inner sheath () is closed off by a first bursting disc () and the outer sheath () is closed off by a second bursting disc ().

Termination for a superconductive cable

A method for cooling a plant for superconductive cables is provided, where the plant includes two thermally insulated end closures () and at least one thermally insulated, tubular cryostat () arranged between the end closures, in which at least one superconductive cable is arranged. Liquid nitrogen contained in a cooling agent supply is pumped by means of a pump () through a first end closure and the cryostat to a second end closure. At least one vacuum insulated tank () is used for the cooling agent supply, where the tank () contains nitrogen at operating temperature and out of which the nitrogen is pumped. For making available a quantity of liquid nitrogen necessary for operating the plant, the supply of liquid nitrogen contained in the tank () is supplemented during operation or is switched over to another tank () containing liquid nitrogen.

Method for cooling a plant for superconductive cables

A method for transmitting electrical energy is proposed in which between two electrical units electrical current is transmitted by means of a superconductive cable system (). The two ends of the superconductive cable system () are each connected in a current conducting manner to one of the electrical units. A normally conductive cable system. () is arranged parallel to the superconductive cable system (). The function of the superconductive cable system () is monitored by a control unit (). During normal operation. only one end of the normally conductive cable system () is connected in a voltage conducting manner to one of the electrical units. In case of a malfunction of the superconductive cable system (), a first signal () of the control unit () initially connects the other end of the normally conductive cable system () to the other electrical unit, so that the normally conductive cable system () becomes current conducting, and the superconductive cable system () is subsequently switched off by at least one of the electrical units.

Method of transmitting electrical energy

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 specified having a superconducting cable (SK) which comprises a superconducting conductor () and a superconducting screen () which concentrically surrounds the same with the interposition of a dielectric (). The cable (SK) is surrounded by a cryostat (KR) enclosing a free space (FR) for a coolant to be passed through, which cryostat (KR) which cryostat comprises two metallic tubes () which are arranged concentrically with respect to one another and between which vacuum insulation is arranged. The screen () is composed of a superconducting material whose electrical resistance value in the normally conductive state is greater by a factor of at least 50 than the electrical resistance value of the material used for the conductor () in the normally conductive state.

Arrangement having a superconducting cable

A method is disclosed for electrically conductively connecting two superconductive cables. The ends of the two cables are arranged next to each other and parallel to one another, in such a way that their free ends point in the opposite direction, and their conductors are located at least approximately on the same level next to each other. Two conductors of the two cables are electrically conductively connected to each other through electrical contact elements (). The screens () of the two cables () are connected through by separate contact elements () and the two cable ends are treated in this manner for constructing a transmission length for electrical energy are arranged jointly in a housing () of a cryostat so that during operation of the transmission length, a flowable cooling agent with electrically insulating properties flows through a housing () of a cryostat.

Method of electrically conductively connecting two superconductive cables

An arrangement is provided with three superconductive phase conductors each with a conductor, a dielectric and an electrically conductive screen surrounding the dielectric. The three phase conductors are arranged in a cryostat which conducts a cooling agent and which is made from a pipe with a thermal insulation. The screens of each of the conductors are for forming three, or a whole number multiple of three, sections arranged successively in the longitudinal direction by partial screens in a first, a second and a third section at two locations or at two locations spaced apart from each other. The partial screen of a first section of each phase conductor is electrically conductively connected in series to the partial screens of the second section and further to the third section of the two other phase conductors.

Arrangement with three superconductive phase conductors

An arrangement for electrically conductively connecting two superconductive strip-shaped electrical conductors () having at least approximately the same width, where the two conductors () rest against each other with their end faces against each other in a connecting point (V). A strip () of superconductive material is soldered to the two conductors (), where the strip extends beyond both conductors so as to cover the connecting point (V). A strip () is used which has, only in the area of the connecting point (V) between the two conductors (), at least approximately the same width as the conductors, and where the strip narrows on both sides of the connecting point (V) and facing away from the connecting point (V).

Arrangement for electrically conductively connecting two superconductive conductors

A method of electrically conductively connecting two superconductive cables includes freeing the conductors and screens of surrounding layers at the ends of the two cables. Subsequently, the ends of the two cables () are placed next o each other and parallel to one another in such a way that their free ends point, in the same direction, and the ends are rigidly connected to one another in this position. The conductors and their screens are electrically conductively connected to each other through electrical contact elements () extending transversely of the axial direction. and the two cable ends treated in this manner are arranged in a housing () of a cryostat when building up the transmission length which, during operation of the transmission length, a flowable cooling agent with insulating properties flows through the housing.

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Hannover, Germany

Mark Stemmle