EP0657958A1 - Current feeder module for the supply of a superconducting electric load - Google Patents

Current feeder module for the supply of a superconducting electric load Download PDF

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Publication number
EP0657958A1
EP0657958A1 EP94402740A EP94402740A EP0657958A1 EP 0657958 A1 EP0657958 A1 EP 0657958A1 EP 94402740 A EP94402740 A EP 94402740A EP 94402740 A EP94402740 A EP 94402740A EP 0657958 A1 EP0657958 A1 EP 0657958A1
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EP
European Patent Office
Prior art keywords
module
conductors
module according
superconducting
cryostat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94402740A
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German (de)
French (fr)
Inventor
Peter Herrmann
Erick Beghin
Christian Cottevieille
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Alstom SA
Original Assignee
GEC Alsthom Electromecanique SA
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Filing date
Publication date
Application filed by GEC Alsthom Electromecanique SA filed Critical GEC Alsthom Electromecanique SA
Publication of EP0657958A1 publication Critical patent/EP0657958A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/68—Connections to or between superconductive connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H01F6/065—Feed-through bushings, terminals and joints
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/825—Apparatus per se, device per se, or process of making or operating same
    • Y10S505/888—Refrigeration
    • Y10S505/892—Magnetic device cooling

Definitions

  • the present invention relates to a current supply module for supplying a superconductive electric charge at low critical temperature.
  • the invention applies in particular for currents of a few tens to a few hundred amps.
  • said electrical charge being electrically connected to the lower end of the two conductors of the superconducting module at high critical temperature
  • said cryostat is partially filled with liquid helium up to a level reaching at least said electrical connection between said charge and said conductors of the superconducting module.
  • said structure is made of charged epoxy resin, as well as the insulating core separating the two conductors of the superconductive module, these two conductors being made of superconductive ceramic.
  • cryostat 1 with its closure cover 2 to which is attached a current supply module 3 according to the invention for the electrical supply of a superconductive electrical charge 4 at low critical temperature, such than a coil.
  • This electric charge 4 is immersed in liquid helium 5 to 4.2 K.
  • the current supply 3 comprises a pair of metallic conductors 6 and 7, for example of copper, which is connected at its lower end, at the end upper part of a superconducting module 8 at high critical temperature comprising two conductors 9 and 10 made of superconductive ceramic at critical temperature T c ⁇ 80 K separated by an insulating core 11, of charged epoxy resin, constituting a mechanical reinforcement for the conductors 9, 10 .
  • This structure 14 constitutes a sealed envelope up to the junction 16 between the metal conductors 6, 7 and the conductors 9, 10 of the superconducting module 8.
  • This junction 16 constitutes the bottom of this sealed envelope.
  • the lower part of this sealed envelope contains liquid nitrogen 22 to 77 K.
  • This tube is fitted with a plug 18.
  • the structure 14 made of charged epoxy resin, extends to the bottom of the lower end of the superconducting module 8 by a plurality of legs 19, the lower ends of which form a flange 20 for fixing the load 4 which is thus suspended from structure 14.
  • a current supply is thus obtained, creating only a low cryogenic charge at the temperature of liquid helium. Indeed, the copper conductors 6, 7 do not dive into helium.
  • the nitrogen 22 maintains the upper end of the superconducting module 8, that is to say the junction 16, at a temperature of 77 K, a temperature below the critical temperature.
  • the intermediate temperature of the junction 16 can also be obtained by placing a heat exchanger inside the insulating structure 14, in its sealed part. This exchanger being in contact with junction 16 and traversed by a flow of cold gas.

Abstract

The current feeder module (3) for the supply of a low-critical-temperature superconducting electrical load is placed in a cryostat (1), is fixed to its closure lid (2) and comprises a pair of metallic conductors (6, 7) passing through the lid (2) and connected at their lower end to the upper end of a high-critical-temperature superconducting module (8) comprising two conductors (9, 10) which are electrically connected to the said pair of metallic conductors (6, 7) and are separated by an insulating core (11) forming a mechanical reinforcement, an insulating structure (14), fixed by its upper end (15), under the said lid (2) of the cryostat (1), surrounding in a sealed manner the pair of metallic conductors (6, 7) as far as its junction (16) with the superconducting module (8), the structure (14) extending, in a non-sealed manner, as far as at least the lower end of the superconducting module (8), the structure (14) including, at its lower end, fixing means (20) for supporting the electrical load (4). <IMAGE>

Description

La présente invention concerne un module d'amenée de courant pour l'alimentation d'une charge électrique supraconductrice à basse température critique.The present invention relates to a current supply module for supplying a superconductive electric charge at low critical temperature.

L'invention s'applique en particulier pour des courants de quelques dizaines à quelques centaines d'ampères.The invention applies in particular for currents of a few tens to a few hundred amps.

On connaît des amenées de courant constituées par des conducteurs métalliques, en cuivre par exemple, reliés à la charge électrique située dans l'hélium liquide, la liaison entre la charge et les conducteurs d'amenée étant noyée dans l'hélium. Cependant, une telle disposition occasionne des pertes par effet joule dans les conducteurs d'amenée et également par conduction thermique provoquant une consommation importante d'hélium. Il faut également prévoir un support pour la charge qui peut également provoquer des pertes par conduction.Current leads are known which consist of metallic conductors, for example of copper, connected to the electrical charge located in liquid helium, the connection between the charge and the feed conductors being embedded in helium. However, such an arrangement causes losses by Joule effect in the supply conductors and also by thermal conduction causing a significant consumption of helium. It is also necessary to provide a support for the load which can also cause conduction losses.

La présente invention a pour but de pallier ces inconvénients, et a pour objet un module d'amenée de courant pour l'alimentation électrique d'une charge électrique supraconductrice à basse température critique, ledit module étant situé dans un cryostat et fixé à son couvercle de fermeture, caractérisé en ce qu'il comprend une paire de conducteurs métalliques, traversant ledit couvercle et reliée à son extrémité inférieure à l'extrémité supérieure d'un module supraconducteur à haute température critique comprenant deux conducteurs, électriquement reliés à ladite paire de conducteurs métalliques et séparés par une âme isolante constituant un renfort mécanique, une structure isolante, fixée par son extrémité supérieure sous ledit couvercle du cryostat, entourant d'une façon étanche ladite paire de conducteurs métalliques jusqu'à sa jonction avec ledit module supraconducteur à haute température critique, ladite structure se prolongeant, d'une manière non étanche, jusqu'à au moins l'extrémité inférieure dudit module supraconducteur, ladite structure comportant à son extrémité inférieure des moyens de fixation pour supporter ladite charge électrique.The present invention aims to overcome these drawbacks, and relates to a current supply module for the electrical supply of a superconductive electric charge at low critical temperature, said module being located in a cryostat and fixed to its cover. closure, characterized in that it comprises a pair of metallic conductors, passing through said cover and connected at its lower end to the upper end of a high critical temperature superconducting module comprising two conductors, electrically connected to said pair of conductors metallic and separated by an insulating core constituting a mechanical reinforcement, an insulating structure, fixed by its upper end under said lid of the cryostat, sealingly surrounding said pair of metallic conductors until it joins said high temperature superconducting module critical, said structure extending in a manner not waterproof era, up to at least the lower end of said superconducting module, said structure comprising at its lower end fixing means for supporting said electric charge.

Selon une autre caractéristique, la partie étanche de ladite structure isolante est partiellement remplie d'azote liquide.According to another characteristic, the sealed part of said insulating structure is partially filled with liquid nitrogen.

Selon une autre caractéristique, ladite charge électrique étant électriquement reliée à l'extrémité inférieure des deux conducteurs du module supraconducteur à haute température critique, ledit cryostat est partiellement rempli d'hélium liquide jusqu'à un niveau atteignant au moins ladite liaison électrique entre ladite charge et lesdits conducteurs du module supraconducteur.According to another characteristic, said electrical charge being electrically connected to the lower end of the two conductors of the superconducting module at high critical temperature, said cryostat is partially filled with liquid helium up to a level reaching at least said electrical connection between said charge and said conductors of the superconducting module.

Avantageusement, ladite structure est en résine époxy chargée, ainsi que l'âme isolante séparant les deux conducteurs du module supraconducteur, ces deux conducteurs étant en céramique supraconductrice.Advantageously, said structure is made of charged epoxy resin, as well as the insulating core separating the two conductors of the superconductive module, these two conductors being made of superconductive ceramic.

On va maintenant donner la description d'un exemple de mise en oeuvre de l'invention en se reportant au dessin annexé dans lequel :We will now give the description of an exemplary implementation of the invention with reference to the appended drawing in which:

La figure 1 est une vue schématique d'un module d'amenée de courant selon l'invention situé dans un cryostat.Figure 1 is a schematic view of a current supply module according to the invention located in a cryostat.

La figure 2 est une section selon II-II de la figure 1.Figure 2 is a section along II-II of Figure 1.

En se reportant aux figures, on voit un cryostat 1 avec son couvercle de fermeture 2 auquel est fixé un module d'amenée de courant 3 selon l'invention pour l'alimentation électrique d'une charge électrique supraconductrice 4 à basse température critique, telle qu'une bobine. Cette charge électrique 4 est immergée dans de l'hélium liquide 5 à 4,2 K.Referring to the figures, we see a cryostat 1 with its closure cover 2 to which is attached a current supply module 3 according to the invention for the electrical supply of a superconductive electrical charge 4 at low critical temperature, such than a coil. This electric charge 4 is immersed in liquid helium 5 to 4.2 K.

L'amenée de courant 3 comprend une paire de conducteurs métalliques 6 et 7, par exemple en cuivre, qui est reliée à son extrémité inférieure, à l'extrémité supérieure d'un module supraconducteur 8 à haute température critique comprenant deux conducteurs 9 et 10 en céramique supraconductrice à température critique Tc ≧ 80 K séparés par une âme isolante 11, en résine époxy chargée, constituant un renfort mécanique pour les conducteurs 9, 10.The current supply 3 comprises a pair of metallic conductors 6 and 7, for example of copper, which is connected at its lower end, at the end upper part of a superconducting module 8 at high critical temperature comprising two conductors 9 and 10 made of superconductive ceramic at critical temperature T c ≧ 80 K separated by an insulating core 11, of charged epoxy resin, constituting a mechanical reinforcement for the conductors 9, 10 .

Les conducteurs 9, 10 en céramique supraconductrice sont électriquement reliés aux conducteurs en cuivre 6, 7 par un procédé connu en soi.The conductors 9, 10 of superconductive ceramic are electrically connected to the copper conductors 6, 7 by a method known per se.

A son extrémité inférieure, les conducteurs 9, 10 en céramique supraconductrice sont également électriquement reliés d'une façon connue en soi aux deux extrémités 12, 13 de la bobine de charge 4. Il s'agit par exemple d'une soudure que l'on peut facilement défaire pour éventuellement changer la charge 4.At its lower end, the conductors 9, 10 of superconductive ceramic are also electrically connected in a manner known per se to the two ends 12, 13 of the charging coil 4. This is for example a solder that the you can easily undo to possibly change the load 4.

Les conducteurs métalliques 6, 7 sont entourés par une structure isolante 14, par exemple en résine époxy chargée, qui est fixée par une bride 15 sous le couvercle 2 du cryostat.The metal conductors 6, 7 are surrounded by an insulating structure 14, for example made of charged epoxy resin, which is fixed by a flange 15 under the cover 2 of the cryostat.

Cette structure 14 constitue une enveloppe étanche jusqu'à la jonction 16 entre les conducteurs métalliques 6, 7 et les conducteurs 9, 10 du module supraconducteur 8. Cette jonction 16 constitue le fond de cette enveloppe étanche. La partie inférieure de cette enveloppe étanche contient de l'azote liquide 22 à 77 K.This structure 14 constitutes a sealed envelope up to the junction 16 between the metal conductors 6, 7 and the conductors 9, 10 of the superconducting module 8. This junction 16 constitutes the bottom of this sealed envelope. The lower part of this sealed envelope contains liquid nitrogen 22 to 77 K.

Un tube 17, qui traverse le couvercle 2, permet l'alimentation en azote. Ce tube est équipé d'un bouchon 18.A tube 17, which passes through the cover 2, allows the nitrogen supply. This tube is fitted with a plug 18.

Au dessous de la jonction 16, la structure 14, en résine époxy chargée, se prolonge jusqu'au dessous de l'extrémité inférieure du module supraconducteur 8 par une pluralité de jambes 19 dont les extrémités inférieures forment une bride 20 pour la fixation de la charge 4 qui est ainsi suspendue à la structure 14.Below the junction 16, the structure 14, made of charged epoxy resin, extends to the bottom of the lower end of the superconducting module 8 by a plurality of legs 19, the lower ends of which form a flange 20 for fixing the load 4 which is thus suspended from structure 14.

Le niveau 21 d'hélium dans le cryostat est tel qu'il arrive au-dessus de la liaison électrique entre les conducteurs 12, 13 de la charge 4 et les conducteurs supraconducteurs en céramique 9, 10.The helium level 21 in the cryostat is such that it arrives above the electrical connection between the conductors 12, 13 of the load 4 and the ceramic superconductive conductors 9, 10.

On obtient ainsi une amenée de courant ne créant qu'une faible charge cryogénique à la température de l'hélium liquide. En effet, les conducteurs en cuivre 6, 7 ne plongent pas dans l'hélium.A current supply is thus obtained, creating only a low cryogenic charge at the temperature of liquid helium. Indeed, the copper conductors 6, 7 do not dive into helium.

L'azote 22 maintient l'extrémité supérieure du module supraconducteur 8, c'est-à-dire la jonction 16, à une température de 77 K, température inférieure à la température critique.The nitrogen 22 maintains the upper end of the superconducting module 8, that is to say the junction 16, at a temperature of 77 K, a temperature below the critical temperature.

La température intermédiaire de la jonction 16 peut également être obtenue en disposant un échangeur de chaleur à l'intérieur de la structure isolante 14, dans sa partie étanche. Cet échangeur étant en contact avec la jonction 16 et parcouru par un flux de gaz froid.The intermediate temperature of the junction 16 can also be obtained by placing a heat exchanger inside the insulating structure 14, in its sealed part. This exchanger being in contact with junction 16 and traversed by a flow of cold gas.

La structure 14, en résine époxy chargée, moulée d'une seule pièce, est robuste, elle assure à la fois le rôle de réservoir d'azote 22, permettant d'obtenir depuis l'extrémité inférieure du module 8 à 4,2 K jusqu'à la jonction 16 à 77 K, un gradient de température maintenant, comme on vient de le dire, sur toute sa longueur le module 8 à une température inférieure à sa température critique, pour autant que le courant de fonctionnement n'est pas dépassé sévèrement et en même temps, cette structure 14 assure le rôle de support mécanique de la charge électrique 4.The structure 14, in charged epoxy resin, molded in one piece, is robust, it simultaneously fulfills the role of nitrogen reservoir 22, making it possible to obtain from the lower end of the module 8 at 4.2 K up to junction 16 to 77 K, a temperature gradient now, as we have just said, over its entire length the module 8 at a temperature below its critical temperature, provided that the operating current is not severely exceeded and at the same time, this structure 14 fulfills the role of mechanical support for the electric charge 4.

Claims (8)

1/ Module d'amenée de courant (3) pour l'alimentation électrique d'une charge électrique supraconductrice (4) à basse température critique, ledit module (3) étant situé dans un cryostat (1) et fixé à son couvercle de fermeture (2), caractérisé en ce qu'il comprend une paire de conducteurs métalliques (6, 7), traversant ledit couvercle (2) et reliée à son extrémité inférieure, à l'extrémité supérieure d'un module supraconducteur (8) à haute température critique comprenant deux conducteurs (9, 10), électriquement reliés à ladite paire de conducteurs métalliques (6, 7) et séparés par une âme isolante (11) constituant un renfort mécanique, une structure isolante (14), fixée par son extrémité supérieure (15) sous ledit couvercle (2) du cryostat (1), entourant d'une façon étanche ladite paire de conducteurs métalliques (6, 7) jusqu'à sa jonction (16) avec ledit module supraconducteur (8) à haute température critique, ladite structure (14) se prolongeant, d'une manière non étanche , jusqu'à au moins l'extrémité inférieure dudit module supraconducteur (8), ladite structure (14) comportant à son extrémité inférieure des moyens (20) de fixation pour supporter ladite charge électrique (4). 1 / Current supply module (3) for the electrical supply of a superconductive electric charge (4) at low critical temperature, said module (3) being located in a cryostat (1) and fixed to its closing cover (2), characterized in that it comprises a pair of metal conductors (6, 7), passing through said cover (2) and connected at its lower end, to the upper end of a superconducting module (8) with high critical temperature comprising two conductors (9, 10), electrically connected to said pair of metallic conductors (6, 7) and separated by an insulating core (11) constituting a mechanical reinforcement, an insulating structure (14), fixed by its upper end (15) under said cover (2) of the cryostat (1), sealingly surrounding said pair of metal conductors (6, 7) until it joins (16) with said superconducting module (8) at high critical temperature , said structure (14) extended nt, in a leaktight manner, up to at least the lower end of said superconductive module (8), said structure (14) comprising at its lower end means (20) for fixing to support said electric charge (4) . 2/ Module selon la revendication 1, caractérisé en ce que ladite structure (14) est en résine époxy chargée. 2 / Module according to claim 1, characterized in that said structure (14) is made of charged epoxy resin. 3/ Module selon l'une des revendications 1 ou 2, caractérisé en ce que ladite âme isolante (11) est en résine époxy chargée. 3 / Module according to one of claims 1 or 2, characterized in that said insulating core (11) is made of charged epoxy resin. 4/ Module selon l'une des revendications 1 à 3, caractérisé en ce que la partie étanche de ladite structure isolante (14) est partiellement remplie d'azote liquide (22). 4 / Module according to one of claims 1 to 3, characterized in that the sealed part of said insulating structure (14) is partially filled with liquid nitrogen (22). 5/ Module selon l'une des revendications 1 à 3, caractérisé en ce que la partie étanche de ladite structure isolante (14) est équipée d'un échangeur de chaleur en contact avec ladite jonction (16) et parcouru par un flux de gaz froid. 5 / Module according to one of claims 1 to 3, characterized in that the sealed part of said insulating structure (14) is equipped with a heat exchanger in contact with said junction (16) and traversed by a flow of gas cold. 6/ Module selon l'une des revendications 1 à 5, caractérisé en ce que ladite charge électrique (4) étant reliée électriquement à l'extrémité inférieure des deux conducteurs (9, 10) dudit module supraconducteur (8) à haute température critique, ledit cryostat (1) est partiellement rempli d'hélium liquide (5) jusqu'à un niveau (21) atteignant au moins ladite liaison électrique entre ladite charge électrique (4) et lesdits conducteurs (9, 10) dudit module supraconducteur (8). 6 / Module according to one of claims 1 to 5, characterized in that said electrical charge (4) being electrically connected to the lower end of the two conductors (9, 10) of said superconducting module (8) at high critical temperature, said cryostat (1) is partially filled with liquid helium (5) to a level (21) reaching at least said electrical connection between said electrical charge (4) and said conductors (9, 10) of said superconducting module (8) . 7/ Module selon l'une des revendications 1 à 6, caractérisé en ce que les deux dits conducteurs (9, 10) dudit module supraconducteur sont en une céramique supraconductrice. 7 / Module according to one of claims 1 to 6, characterized in that the two said conductors (9, 10) of said superconductive module are made of a superconductive ceramic. 8/ Module selon l'une des revendications précédentes, caractérisé en ce que ledit prolongement non étanche de ladite structure (14) est constitué par une pluralité de jambes (19), la totalité de ladite structure (14) étant moulée en une seule pièce. 8 / Module according to one of the preceding claims, characterized in that said non-watertight extension of said structure (14) is constituted by a plurality of legs (19), the whole of said structure (14) being molded in one piece .
EP94402740A 1993-12-03 1994-11-30 Current feeder module for the supply of a superconducting electric load Withdrawn EP0657958A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9314541A FR2713405B1 (en) 1993-12-03 1993-12-03 Current supply module for supplying a superconductive electric charge at low critical temperature.
FR9314541 1993-12-03

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EP0657958A1 true EP0657958A1 (en) 1995-06-14

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US (1) US5524441A (en)
EP (1) EP0657958A1 (en)
FI (1) FI945653A (en)
FR (1) FR2713405B1 (en)
NO (1) NO944611L (en)
RU (1) RU94042934A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0723278A1 (en) * 1995-01-17 1996-07-24 Gec Alsthom Electromecanique Sa High tension current lead between a S.C. device at low critical temperature and a high tension cable connection terminal on room temperature
KR970054941A (en) * 1995-12-21 1997-07-31 피에르 지오반니 지아네시 Terminal for connecting superconducting polyphase cables to electrical devices at room temperature
US8588443B2 (en) 2006-05-16 2013-11-19 Phonak Ag Hearing system with network time

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RU94042934A (en) 1996-10-20
US5524441A (en) 1996-06-11
FI945653A (en) 1995-06-04
NO944611L (en) 1995-06-06
FR2713405B1 (en) 1996-01-19
NO944611D0 (en) 1994-12-01
FI945653A0 (en) 1994-11-30
FR2713405A1 (en) 1995-06-09

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