EP0107830A1 - Commutateur à courant permanent destiné à court-circuiter au moins un enroulement d'aimant supraconducteur - Google Patents

Commutateur à courant permanent destiné à court-circuiter au moins un enroulement d'aimant supraconducteur Download PDF

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Publication number
EP0107830A1
EP0107830A1 EP83110191A EP83110191A EP0107830A1 EP 0107830 A1 EP0107830 A1 EP 0107830A1 EP 83110191 A EP83110191 A EP 83110191A EP 83110191 A EP83110191 A EP 83110191A EP 0107830 A1 EP0107830 A1 EP 0107830A1
Authority
EP
European Patent Office
Prior art keywords
pieces
current switch
contact
superconducting
conductor
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.)
Granted
Application number
EP83110191A
Other languages
German (de)
English (en)
Other versions
EP0107830B1 (fr
Inventor
Holger Franksen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0107830A1 publication Critical patent/EP0107830A1/fr
Application granted granted Critical
Publication of EP0107830B1 publication Critical patent/EP0107830B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/002—Very heavy-current switches
    • H01H33/004—Very heavy-current switches making use of superconducting contacts

Definitions

  • the invention relates to a continuous current switch for short-circuiting at least one superconducting magnetic winding with at least two contact pieces, each of which has a plurality of superconducting conductor pieces, which are arranged in parallel with one another and connected to a carrier element, and are cooled by a cryogenic coolant, and with an actuating device for joining the superconducting conductor pieces together with a predetermined contact force.
  • a corresponding continuous current switch is known from DE-OS 25 21 328.
  • the known continuous current switch contains two contact pieces, each of which has a carrier element made of normally conducting material as a matrix, in which superconducting conductor pieces arranged parallel to one another are embedded.
  • a mechanical actuating device required to open and close the switch is designed such that the superconducting conductor pieces of the two contact pieces and their normally conductive parts can be joined together.
  • the contact surfaces are held indirectly by a cryogenic coolant at the operating temperature of the superconducting conductor pieces, since they are arranged in a vacuum chamber in order to be able to exclude contamination of the surfaces.
  • the surface of one contact piece is curved, while the other contact piece can have, for example, a flat or a concave surface.
  • a relatively high contact force is required in addition to an exact guidance of the contact pieces. Nevertheless, it cannot be guaranteed that all corresponding superconducting conductor pieces of the two contact pieces are joined together with approximately the same contact force and thus cause approximately the same contact resistance. Rather, it can be assumed that individual superconducting conductor pieces lie against one another only with a relatively low contact force and thus lead to correspondingly high contact resistances.
  • Resistors of this type are required in particular for large superconducting magnets, such as are to be provided for devices for nuclear fusion or for magnetic resonance imaging, for example.
  • the superconducting conductor pieces are arranged lying on the mutually facing surfaces of the contact pieces in at least largely parallel planes such that the conductor pieces of the first contact piece cross the conductor pieces of the further contact piece, and that the conductor pieces of the first contact piece are also fixed are attached to the surface of the corresponding carrier element, while each conductor piece of the further contact piece at least above each crossing point with the conductor pieces of the first contact piece by means of a resilient support device on the. associated carrier element is held.
  • FIGS. 1 and 2 each schematically illustrate a section through an exemplary embodiment of a continuous current switch according to the invention.
  • the continuous current switch indicated in a cross section in FIG. 1 contains two contact pieces 2 and z which can be moved or joined together by means of an actuating device which is not shown in the figure.
  • the first contact piece 2 is arranged stationary, while the further, movably designed contact piece 3 can be pressed against the stationary contact piece 2 by means of the actuating device with an actuating force F represented by an arrow.
  • the two contact pieces 2 and 3 are each electrically conductively connected to the ends of the conductors of at least one superconducting magnetic winding (not shown in the figure) or directly represent the conductor ends of this winding Basic field of a nuclear spin system Tomography or the winding of a magnet of a nuclear fusion system.
  • The, for example, stationary contact piece 2 contains a flat contact plate 4, on the surface of which, facing the movable contact piece 3, a plurality of superconducting conductor pieces 5 aligned parallel to one another are mechanically fixed. For example, at least five superconducting conductor pieces 5 are soldered onto the contact plate 4 which serves as the carrier element.
  • the contact plate 4 advantageously consists of an electrically highly conductive material which is normally conductive at the operating temperature of the superconducting conductor pieces 5, e.g. made of copper or aluminum. With the superconducting conductor pieces, e.g. have a round or rectangular cross-section, it can in particular be a so-called high-current superconductor.
  • These conductor pieces can be both unstabilized and also stabilized with normally conductive material, preferably superconducting conductor parts of these conductor pieces coming to rest at least on the surface side facing the movable contact piece 3.
  • the movable contact piece 3 also contains a large number of individual superconducting conductor pieces 6 aligned parallel to one another. These conductor pieces are arranged transversely with respect to the conductor pieces 5 of the stationary contact piece 2, so that when the conductor pieces 5 and 6 of the two contact pieces 2 are joined together and 3 result in a multiplicity of intersection or contact points 7.
  • the conductor pieces 6 should be on a movable, contact plate 8 connected to the actuating device cannot be rigidly fastened in accordance with the conductor pieces 5; rather, a resilient support of the conductor pieces 6 is provided with respect to their contact plate 8 serving as a carrier element.
  • each conductor piece 6 is fastened to the movable contact plate 8 in the areas of its crossing points 7 with each conductor piece 5 of the fixed contact piece 2 via a corresponding support device 9, which also serves to guide and hold the conductor pieces 6.
  • This device 9 contains a guide rod 11 projecting through a corresponding bore 10 in the contact plate 8, which is fastened at one end to the corresponding superconductor piece 6 via, for example, a disk-shaped connecting element 12 and which by means of a stop 13 at its opposite end prevents it from slipping out the bore 10 is secured.
  • a spring 14 enclosing the respective guide rod 11 is clamped with a predetermined spring force.
  • a predetermined contact force K is generated at the individual crossing points 7 of each of the superconductor pieces 5 with the superconductor pieces 6, which is due to the individual springs 14 caused compressive forces for each contact point 7 between the superconductor pieces 5 and 6 is at least largely the same size.
  • the contact resistance is correspondingly small at each contact point. It is thus possible to apply the high surface pressure required for the contacts with a relatively low actuating force F in order to achieve the required low contact resistance of the order of 10 -9 ⁇ between the contacts.
  • the superconducting conductor pieces 5 and 6 can be arranged directly in a cryogenic medium ensuring their superconductivity, which is in particular the cooling medium of the connected superconducting magnet winding. If necessary, indirect cooling of these conductor sections is also possible (cf. DE-OS 25 21 328).
  • the relatively low actuating force F of the continuous current switch not only permits the actuation assumed in FIG. 1 by means of a linkage, but also a pneumatic or hydraulic actuation is possible. Such actuation is known per se (DE-PS 23 24 371).
  • a corresponding exemplary embodiment is indicated in FIG. 2 as a cross section. It is assumed that one of the contact pieces is stationary and corresponds to the contact piece 2 with superconductor pieces 5 according to FIG. 1.
  • a multiplicity of superconducting conductor pieces 16 of a further contact piece, designated 17, of this switch are connected via a pneumatic or hydraulic support device 18 with a fixed, plat ten-shaped carrier element 19 mechanically connected.
  • the support device 18 contains a thin, flat membrane 20, which consists, for example, of stainless steel and to which the superconductor pieces 16 are rigidly fastened in accordance with the arrangement according to FIG.
  • This membrane 20 is fastened to the stationary support element 19 via a bellows 21.
  • the interior 22 of this support element 19, the bellows 21 and the membrane 20 holding the superconductor pieces 16, which are vacuum-tight, can be pressurized via a pressure line 23, so that the superconductor pieces 16 have approximately the same contact force K on the superconductor pieces 5 arranged transversely to them Contact piece 2 are pressed.
  • gaseous or liquid helium can in particular be provided as the pressure medium.
  • the continuous current switch according to the invention can be provided particularly advantageously for magnetic windings which are wound with superconducting conductor cables made of several superconducting individual conductors.
  • the superconducting individual conductors can form the superconductor pieces of the contact pieces directly from the fanned-out conductor cable.
  • the continuous current switch according to the invention has only two flat contact pieces with conductor pieces to be joined together, the conductor pieces being cushioned on one level above each crossing or contact point.
  • the continuous current switch according to the invention can equally well have more than two levels with line pieces, with resilient support of the conductor pieces being provided for every second level.

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  • Containers, Films, And Cooling For Superconductive Devices (AREA)
EP83110191A 1982-10-28 1983-10-12 Commutateur à courant permanent destiné à court-circuiter au moins un enroulement d'aimant supraconducteur Expired EP0107830B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823240019 DE3240019A1 (de) 1982-10-28 1982-10-28 Dauerstromschalter zum kurzschliessen mindestens einer supraleitenden magnetwicklung
DE3240019 1982-10-28

Publications (2)

Publication Number Publication Date
EP0107830A1 true EP0107830A1 (fr) 1984-05-09
EP0107830B1 EP0107830B1 (fr) 1987-01-28

Family

ID=6176870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110191A Expired EP0107830B1 (fr) 1982-10-28 1983-10-12 Commutateur à courant permanent destiné à court-circuiter au moins un enroulement d'aimant supraconducteur

Country Status (4)

Country Link
US (1) US4623769A (fr)
EP (1) EP0107830B1 (fr)
JP (1) JPS5994889A (fr)
DE (2) DE3240019A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150361A3 (fr) * 1984-01-27 1987-10-07 Siemens Aktiengesellschaft Dispositif interrupteur pour le court-circuitage d'un enroulement super-conducteur
EP0357449A3 (fr) * 1988-09-02 1990-07-11 General Electric Company Dispositif de contact pour circuit à supraconduction

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2549137Y2 (ja) * 1991-11-06 1997-09-30 和江 三木 わきの下に貼る汗取りパッド
US8384504B2 (en) * 2006-01-06 2013-02-26 Quantum Design International, Inc. Superconducting quick switch
US8134434B2 (en) * 2007-01-05 2012-03-13 Quantum Design, Inc. Superconducting quick switch
KR101406947B1 (ko) * 2011-10-11 2014-06-12 삼성전자주식회사 초전도 자석 장치 및 그 제어방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096421A (en) * 1958-04-16 1963-07-02 Walter G Finch Superconducting contact devices
DE1615591B1 (de) * 1966-04-26 1971-08-26 Avco Corp Kryogenischer Schalter
DE2521328A1 (de) * 1974-05-15 1975-11-27 Hitachi Ltd Schalter
DE2707589B2 (de) * 1977-02-22 1979-06-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Dauerstromschalter zum Kurzschließen eines supraleitenden Magneten
DE1765415B2 (de) * 1967-06-05 1981-06-19 Uddeholms AB, Uddeholm Stromschalter für eine elektrolytische Chlor-Alkali-Zelle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024363A (en) 1973-05-14 1977-05-17 Siemens Aktiengesellschaft Shorting contacts for closing a superconducting current path operated by a bellows arrangement responsive to the pressure of a cryogenic medium used in cooling the contacts
JPS5132480A (fr) * 1974-09-13 1976-03-19 Mitsubishi Electric Corp
US4239979A (en) 1977-05-12 1980-12-16 Compagnie Generale Des Etablissements Michelin Membrane contactor
GB2102705A (en) 1981-03-24 1983-02-09 Standard Telephones Cables Ltd Electrical contact
US4385215A (en) 1981-11-09 1983-05-24 Eeco Incorporated Thin-membrane switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096421A (en) * 1958-04-16 1963-07-02 Walter G Finch Superconducting contact devices
DE1615591B1 (de) * 1966-04-26 1971-08-26 Avco Corp Kryogenischer Schalter
DE1765415B2 (de) * 1967-06-05 1981-06-19 Uddeholms AB, Uddeholm Stromschalter für eine elektrolytische Chlor-Alkali-Zelle
DE2521328A1 (de) * 1974-05-15 1975-11-27 Hitachi Ltd Schalter
DE2707589B2 (de) * 1977-02-22 1979-06-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Dauerstromschalter zum Kurzschließen eines supraleitenden Magneten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150361A3 (fr) * 1984-01-27 1987-10-07 Siemens Aktiengesellschaft Dispositif interrupteur pour le court-circuitage d'un enroulement super-conducteur
EP0357449A3 (fr) * 1988-09-02 1990-07-11 General Electric Company Dispositif de contact pour circuit à supraconduction

Also Published As

Publication number Publication date
JPS5994889A (ja) 1984-05-31
DE3240019A1 (de) 1984-05-03
EP0107830B1 (fr) 1987-01-28
US4623769A (en) 1986-11-18
DE3369594D1 (en) 1987-03-05

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