Alcatel

Nexans

Alcatel Alsthom Compagnie Generale D'electricite

Peter Friedrich Herrmann

Denis Legat

Albert Leriche

G&eacute;rard Duperray

Gerard Duperray

Erick Beghin

Thierry Verhaege

Jean-Pierre Tavergnier

Fernard Grivon

Francois Moisson-Franckhauser

Pierre Mirebeau

Bernard Wurier

Philippe Gauthier

The present invention relates to a device for fixing a tubular element in a cavity, which device is made up of hoops made of an elastically flexible material disposed in cross-sectional planes of said cavity, and means for retaining said element, said device being characterized in that, along the longitudinal axis of said cavity, said hoops are secured together by a flexible longitudinal support and are interconnected by a flexible membrane.

Device for fixing a tubular element in an inaccessible cavity

Method of decoupling an HTc superconductive multi-filament strand having a silver-based matrix, and a multifilament strand made thereby

The invention relates to a powder in tube type method of manufacturing an HTc superconductor multifilament conductor having a matrix of compatible silver alloy and in which, during preparation of the multifilament billet, the number of segments per layer is organized so that, in cross-section, the segment layers viewed as a whole have the general shape of a converging-diverging nozzle, the throat of the converging-diverging nozzle shape being substantially contained in said superposition midplane; and in which, during the mechanical treatment of said multifilament billet preceding the synthesis heat treatment, a rolling force is applied in a direction perpendicular to the superposition midplane, and at least one of the side edges of the rolled billet is cut off perpendicularly to the superposition midplane, thereby revealing the matrix of compatible silver alloy.

Method of making superconductor strand

A powder in tube type method of making an HTc superconductive multifilament strand having a silver-based matrix, and an HTc superconductive multifilament strand having a silver-based matrix. The method includes, prior to the monofilament step, preparing a composite multilayer material is including at least one silver-based sheet, and at least one layer of non-superconductive ceramic material that is permeable to oxygen. During the monofilament step, a thickness of composite multilayer material is interposed between first and second thicknesses of silver-based material, thereby forming the first silver-based envelope.

Multifilament strand with Ag cladding and a coating of oxygen-permeable ceramic

Method of maintaining a superconducting cryolink at low temperature by a flow of liquid nitrogen produced by a liquefier feeding one end of a link section, wherein the section is fed by a single liquefier and nitrogen is drawn off from at least one intermediate point of the link section.

Method of maintaining a superconducting cryolink at low temperature

Method of decoupling an HTC superconductive multifilament strand having a silver-based matrix, and a multifilament strand made thereby

A powder in tube method of making an HTc superconductive multifilament strand having a silver-based matrix, in which method: prior to the monofilament step: a composite multilayer material is prepared comprising at least one silver-based sheet, and at least one layer of non-superconductive ceramic material that is permeable to oxygen; and during the monofilament step, a thickness of composite multilayer material is interposed between first and second thicknesses of silver-based material, thereby forming said first silver-based envelope.

Method of decoupling an HTc superconductive multifilament strand having

A process for texturing an HTc superconductor of the matrix type based on silver and the superconductor material (Bi.sub.1-x Pb.sub.x).sub.2 Sr.sub.2 Ca.sub.y Cu.sub.1+y O.sub.6+2y where x.epsilon.[0; 0,4] and y.epsilon.{0, 1, 2} includes the following steps carried out in succession: raising the temperature of the superconductor from room temperature to the melting point of the superconductor material, maintaining the temperature of the superconductor constant at the melting point of the superconductor material for a relatively short period, varying the temperature of the superconductor between the melting point of the superconductor material and its synthesis temperature, maintaining the temperature of the superconductor constant at the synthesis temperature of the superconductor material for a relatively long period and reducing the temperature of the superconductor from the synthesis temperature of the superconductor material to room temperature. The step of varying the temperature of the superconductor between the melting point of the superconductor material and its synthesis temperature comprises sudden cooling of the superconductor from the melting point of the superconductor material to an end of cooling temperature less than the synthesis temperature of the superconductor material, and raising the temperature of the superconductor from the end of cooling temperature to the synthesis temperature of the superconductor material.

Process for texturing an HTc superconductor and superconductor made by

An electrical transmission line for conveying and limiting current by using a plurality of tubular portions made from a superconductive material. The tubular portions have a high critical temperature and are connected end-to-end by flexible, electrically conductive metal or alloy joints. A cryogenic fluid flows inside a first tube within the tubular portions. A vacuum is maintained inside a second tube around the tubular portions.

Superconductive electrical transmission line

A sheathed twisted superconductor with a high critical temperature is made from a billet obtained by assembling square cross-section single strands in a square cross-section metal tube. The multistrand obtained by drawing the billet through a roller die is twisted with a particular lay and rolled using rollers the diameter of which is much greater than the twist lay. The sheathed twisted superconductor obtained by this method is intended for variable current applications.

Growing community of inventors

Corbreuse, France

Peter Friedrich Herrmann