WO2002029930A2 - Raccord terminal pour un cable supraconducteur - Google Patents

Raccord terminal pour un cable supraconducteur Download PDF

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Publication number
WO2002029930A2
WO2002029930A2 PCT/DK2001/000639 DK0100639W WO0229930A2 WO 2002029930 A2 WO2002029930 A2 WO 2002029930A2 DK 0100639 W DK0100639 W DK 0100639W WO 0229930 A2 WO0229930 A2 WO 0229930A2
Authority
WO
WIPO (PCT)
Prior art keywords
connection
terminal connection
terminal
superconductive
connection according
Prior art date
Application number
PCT/DK2001/000639
Other languages
English (en)
Other versions
WO2002029930A3 (fr
Inventor
Claus Nygaard Rasmussen
Finn Hansen
Carsten Rasmussen
Original Assignee
Nkt Cables Ultera A/S
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nkt Cables Ultera A/S filed Critical Nkt Cables Ultera A/S
Priority to AU2001293678A priority Critical patent/AU2001293678A1/en
Publication of WO2002029930A2 publication Critical patent/WO2002029930A2/fr
Publication of WO2002029930A3 publication Critical patent/WO2002029930A3/fr

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Classifications

    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the invention relates to a terminal connection for a superconductive cable for electrical equipment at room tem- perature and comprising thermally insulated superconductive tapes wound around a former through whose interior a coolant, such as liquid nitrogen, flows.
  • US Patent No. 6,049,036 discloses a terminal for connect- ing a superconductive multi-phase cable to electrical equipment at room temperature. A drawback of this structure is that it takes up relatively much space.
  • the object of the invention is to provide a terminal con- nection of the type mentioned in the opening paragraph which takes up less space than known before.
  • a terminal connection of the type mentioned in the opening paragraph is characterized according to the invention in that the superconductive tapes are in connection with one or more electrically conducting bodies, which are likewise cooled by means of the coolant, and are in connection by means of flexible electrical conductors with a connection terminal which may be connected to the elec- trical equipment at room temperature, and that the coolant is in connection with a cooling machine via a branch mounted axially relative to the superconductive cable, said cooling machine being electrically insulated from the remaining part of the terminal connection.
  • the electrically conducting bodies may be provided with channels in which the coolant flows. This results in a more effective cooling per unit of length so that shorter lines may be used, thereby allowing a more compact structure.
  • the electrically conducting body or bodies may be of metal, e.g. Al, Ag, Au or Cu, preferably Cu, which are good electrical con- ductors and easy to work mechanically.
  • the terminal connection may be adapted to be rotated in an axial direction relative to the superconductive tape, thereby allowing the unit to be mounted easily on a fixedly mounted cable end.
  • the axially mounted branch may comprise a flexible pipe. This facilitates the mounting.
  • connection of the coolant to the cooling machine may comprise a thermally and electrically insulated pipe and a compensator for compensating changes, if any, in the longitudinal di- rection.
  • the pipe may e.g. be made of a composite material, preferably glass fibre.
  • each of the flexible electrical conductors may consist of a multiple of elec- trical conductors. This gives an increased flexibility at cooling.
  • a heat exchanger may be inserted in connection with the connection termi- nal .
  • the heat exchanger may hereby cool at high power and heat at low power. This prevents icing up of the terminal/bolt.
  • the heat exchanger may e.g. consist of cooling plates/fins .
  • the thermal insulation of the superconductive tapes comprises a vacuum chamber with a vacuum valve, said vacuum valve being arranged such that the connection between the vacuum cham- ber and the cooling machine, in which the coolant flows, serves as an electrical shield of the vacuum valve.
  • connection between the vacuum chamber and the superconductive cable comprises a Johnston coupling.
  • connection terminal is a top bolt adjustable in an axial direction.
  • the top bolt provides an airtight sealing of the inner part of the terminal connection.
  • fig. 1 shows a longitudinal section through a terminal connection according to the invention
  • fig. 2 is a section through a copper block in the terminal connection having some through-going cooling channels through which a coolant flows.
  • a thermally insulated superconductive high-voltage cable is shown, which is connected to electrical equipment at room temperature via a terminal connection according to the invention.
  • the superconductive high-voltage cable which comprises a plurality of superconductive tapes wound around a former, is kept cooled by means of a coolant, such as liquid nitrogen, which flows through the former.
  • a coolant such as liquid nitrogen
  • the outer insula- tion is stripped at the end of the superconductive cable before it is inserted into the terminal connection, which is in the form of a branch, e.g. in the form of a T member, axially mounted relative to the superconductive cable.
  • the superconductive cable is sur- rounded by a vacuum chamber 12 which serves to provide a thermal insulation.
  • a Johnston coupling 15 is inserted between the vacuum chamber 12 and the cable cryostat .
  • the vacuum chamber 12 is evacuated via a vacuum valve 14 connected thereto, said vacuum valve being arranged at a point where there is a low electrical field gradient.
  • the inner part of the vacuum chamber 12 must be capable of contracting relative to the outer part. This is made possible by means of a compensator in the form of a flexible bellows member 27, which is arranged at the other end of the T member.
  • a connection terminal in the form of an axially adjustable top bolt 28 which provides an airtight sealing of the inner part of the terminal connection and serves as a connec- tion terminal.
  • the superconductive cable is terminated in that the former is introduced into a central bore of an electrically conducting body of metal, such Al, Ag, Au or Cu, preferably Cu, since Cu is relatively easy to work.
  • an electrically conducting body of metal such Al, Ag, Au or Cu, preferably Cu, since Cu is relatively easy to work.
  • several electrically conducting bodies may be provided.
  • the individual, electrically conducting body may e.g. be formed by a copper block 20, said superconductive tapes being soldered by means of ordinary soldering pewter to the copper block 20 in an annular groove at the end of it.
  • Fig. 2 shows the copper block 20 on a large scale.
  • the central bore to the left serves to insert the former which, after the insertion, is tightened by means of some screws which are inserted via some rear- wardly positioned cuts.
  • the liquid nitrogen is conveyed from the former into some small channels (a total of 7) in the copper block 20 to obtain a better cooling of it because of the generation of a turbulent flow in the channels, said channels being dimensioned such that they just give rise to a limited pressure drop during the flow therethrough.
  • the liquid nitrogen is then conveyed to a bend 23 which is screwed into the other end of the copper block 20. Counter tightening is effected by means of a counter bolt.
  • the copper block 20 constitutes the transition from superconductors to normal conductors which al- most have room temperature.
  • the liquid nitrogen is conveyed from the bend 23 via a flexible hose 24 up through a pipe of composite material, such as glass fibre, to a cooling machine.
  • the glass fibre pipe 1 serves as an electrically insulating transition pipe which conveys the liquid nitrogen from high-voltage potential to earth potential .
  • the glass fibre pipe 1 is connected with a small steel pipe by gluing and has such a length that a voltage drop of about 36 kV does not give rise to electrical breakdown between the steel pipes.
  • the liquid nitrogen is conveyed from the cooling machine, which is at a low voltage potential, via the pipe 1 to the flexible hose 24 in the vacuum chamber, which is at a high voltage potential.
  • the glass fibre pipe 1 is mounted in an outer glass fibre pipe 5 which has a suitable diameter, e.g. 90 mm.
  • the space between the pipes 1 and 5 is filled with an electrically insulating foam of the Expancel type.
  • This foam is to ensure a low thermal influx to the inner pipe 1, while preventing electrical breakdown between the high voltage and low voltage parts. Further, between the high voltage and low voltage parts there are mounted some external corona rings 6 for the control of the electrical field as well as some silicone rubber discs 7 for the prevention of breakdown in the event that condensed water vapour is present on the surface of the outer pipe 5.
  • Thermal contraction at cooling of the pipe structure is compensated for by means of the bellows-shaped compensator which is positioned in the vicinity of the cooling machine .
  • the current conductor to hot area is soldered by means of ordinary soldering pewter to the other end of the copper block 20 in an annular groove.
  • This current conductor is configured in such a manner that the sum of the heat dissipated in the conductor because of ohmic losses, and the heat admitted from hot area is as low as possible.
  • the current conductor is flexible to enable it to contract at cooling. This flexibility is achieved by dividing the current conductor into a large number of loosely arranged and optionally twisted thin conductors .
  • the top bolt 28 which constitutes the connection to the mains in general or electrical equipment at room temperature, e.g. a transformer.
  • the thin conductors are soldered to the top bolt 28 in an annular groove at the end of it.
  • the top bolt 28 is a solid copper rod with threads at one end for screwing into the top of the chamber.
  • the top bolt 28 is clamped to the vacuum chamber by means of a relatively large brass bolt 30 on which cooling fins 31 are mounted. These cooling fins 31 are to prevent icing when the current in the cable is low, and to counteract possible heating in case of a brief overcurrent .
  • Some corona rings 32 are provided on their respective sides of the cooling fins 31, said corona rings serving to prevent discharges from the sharp edges of the cooling fins 31.
  • a heat exchanger may optionally be arranged in connection with the top bolt (the connection terminal) .
  • Helium at a slight positive pressure relative to the atmosphere may be fed to the space around the current conductor optionally via a special opening. Condensation because of possible leaks is avoided hereby.

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Gas Or Oil Filled Cable Accessories (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

L'invention concerne un raccord terminal d'un câble supraconducteur, comprenant un câble à haute tension à isolation thermique à l'intérieur duquel circule de l'azote liquide. Ce câble supraconducteur comprend une pluralité de bandes supraconductrices qui sont en liaison avec un bloc de cuivre (20) qui est refroidi au moyen de l'azote liquide et qui est en liaison, par l'intermédiaire de conducteurs électriques flexibles (25), avec un axe supérieur (28) qui peut être relié à un équipement électrique à température ambiante. Par l'intermédiaire d'un élément en T, l'azote liquide est en liaison avec une machine de refroidissement qui est isolée électriquement du reste du raccord terminal.
PCT/DK2001/000639 2000-10-02 2001-10-02 Raccord terminal pour un cable supraconducteur WO2002029930A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001293678A AU2001293678A1 (en) 2000-10-02 2001-10-02 A terminal connection for a superconductive cable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200001454 2000-10-02
DKPA200001454 2000-10-02

Publications (2)

Publication Number Publication Date
WO2002029930A2 true WO2002029930A2 (fr) 2002-04-11
WO2002029930A3 WO2002029930A3 (fr) 2002-07-18

Family

ID=8159755

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2001/000639 WO2002029930A2 (fr) 2000-10-02 2001-10-02 Raccord terminal pour un cable supraconducteur

Country Status (2)

Country Link
AU (1) AU2001293678A1 (fr)
WO (1) WO2002029930A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1489693A1 (fr) * 2003-06-19 2004-12-22 Sumitomo Electric Industries, Ltd. structure d'interconnexion d'un câble superconducteur avec un support isolant
EP1489692A2 (fr) * 2003-06-19 2004-12-22 Sumitomo Electric Industries, Ltd. Dispositif de connexion de câble cryogénique
FR2878654A1 (fr) * 2004-12-01 2006-06-02 Nexans Sa Agencement de connexion des ecrans de cables supraconducteurs
US7149560B2 (en) * 2001-11-02 2006-12-12 Sumitomo Electric Industries, Ldt. Superconducting cable and superconducting cable line
EP2104197A1 (fr) 2008-03-20 2009-09-23 Nexans Structure de connexion électrique pour élement supraconducteur
CN101577374B (zh) * 2009-06-04 2010-12-08 北京电巴科技有限公司 一种平面连接器结构
CN113903540A (zh) * 2021-10-20 2022-01-07 合肥聚能电物理高技术开发有限公司 高温超导电流引线分流器及其真空锡焊工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902000A (en) * 1974-11-12 1975-08-26 Us Energy Termination for superconducting power transmission systems
US3959576A (en) * 1974-03-01 1976-05-25 Siemens Aktiengesellschaft Apparatus for supplying power to electrical devices having conductors cooled to a low temperature
US5319154A (en) * 1990-11-20 1994-06-07 Gec Alsthom Sa Method of cooling a current feed for very low temperature electrical equipment and device for implementing it
US6049036A (en) * 1995-12-21 2000-04-11 Metra; Piero Terminal for connecting a superconducting multiphase cable to a room temperature electrical equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959576A (en) * 1974-03-01 1976-05-25 Siemens Aktiengesellschaft Apparatus for supplying power to electrical devices having conductors cooled to a low temperature
US3902000A (en) * 1974-11-12 1975-08-26 Us Energy Termination for superconducting power transmission systems
US5319154A (en) * 1990-11-20 1994-06-07 Gec Alsthom Sa Method of cooling a current feed for very low temperature electrical equipment and device for implementing it
US6049036A (en) * 1995-12-21 2000-04-11 Metra; Piero Terminal for connecting a superconducting multiphase cable to a room temperature electrical equipment

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol.1999, no. 1 29 January 1999; & JP,A,10283854 (FUJIKURA LTD), 23-10-1998 *
PATENT ABSTRACTS OF JAPAN, vol.2000, no. 2 29 February 2000; & JP,A,11329526 (SUMITOMO HEAVY IND LTD), 30-11-1999 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7149560B2 (en) * 2001-11-02 2006-12-12 Sumitomo Electric Industries, Ldt. Superconducting cable and superconducting cable line
KR100845728B1 (ko) * 2003-06-19 2008-07-11 스미토모덴키고교가부시키가이샤 초전도 케이블의 접속 구조 및 초전도 케이블 접속용 절연스페이서
EP1489692A3 (fr) * 2003-06-19 2005-10-19 Sumitomo Electric Industries, Ltd. Dispositif de connexion de câble cryogénique
US7030314B2 (en) 2003-06-19 2006-04-18 Sumitomo Electric Industries, Ltd. Termination structure of cryogenic cable
CN100444488C (zh) * 2003-06-19 2008-12-17 住友电气工业株式会社 低温电缆的终端构件
US7067739B2 (en) 2003-06-19 2006-06-27 Sumitomo Electric Industries, Ltd. Joint structure of superconducting cable and insulating spacer for connecting superconducting cable
EP1489693A1 (fr) * 2003-06-19 2004-12-22 Sumitomo Electric Industries, Ltd. structure d'interconnexion d'un câble superconducteur avec un support isolant
EP1489692A2 (fr) * 2003-06-19 2004-12-22 Sumitomo Electric Industries, Ltd. Dispositif de connexion de câble cryogénique
US7332671B2 (en) 2004-12-01 2008-02-19 Nexans Connection arrangement for superconductor cable shields
EP1681743A1 (fr) * 2004-12-01 2006-07-19 Nexans Agencement de connexion des écrans de câbles supraconducteurs
FR2878654A1 (fr) * 2004-12-01 2006-06-02 Nexans Sa Agencement de connexion des ecrans de cables supraconducteurs
EP2104197A1 (fr) 2008-03-20 2009-09-23 Nexans Structure de connexion électrique pour élement supraconducteur
FR2929052A1 (fr) * 2008-03-20 2009-09-25 Nexans Sa Structure de connexion electrique pour element supraconducteur
CN101577374B (zh) * 2009-06-04 2010-12-08 北京电巴科技有限公司 一种平面连接器结构
CN113903540A (zh) * 2021-10-20 2022-01-07 合肥聚能电物理高技术开发有限公司 高温超导电流引线分流器及其真空锡焊工艺

Also Published As

Publication number Publication date
WO2002029930A3 (fr) 2002-07-18
AU2001293678A1 (en) 2002-04-15

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