WO2003107448A1 - Dispositif de limitation de courant resistif a piste supraconductrice et shunt non supraconducteur - Google Patents

Dispositif de limitation de courant resistif a piste supraconductrice et shunt non supraconducteur Download PDF

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Publication number
WO2003107448A1
WO2003107448A1 PCT/DE2003/001754 DE0301754W WO03107448A1 WO 2003107448 A1 WO2003107448 A1 WO 2003107448A1 DE 0301754 W DE0301754 W DE 0301754W WO 03107448 A1 WO03107448 A1 WO 03107448A1
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WO
WIPO (PCT)
Prior art keywords
layer part
superconducting
superconducting layer
fiber structure
shunt
Prior art date
Application number
PCT/DE2003/001754
Other languages
German (de)
English (en)
Inventor
Günter RIES
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2003107448A1 publication Critical patent/WO2003107448A1/fr

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/30—Devices switchable between superconducting and normal states

Definitions

  • the invention relates to a resistive current limiter device with a conductor track structure for guiding an electric current in a predetermined direction, which device contains a carrier body on which there is at least one electrically conductive conductor track, which has at least one corresponding superconducting layer part made of a superconducting material and one Superconducting layer part associated shunt part made of a non-superconducting material with predetermined, specific electrical resistance.
  • a corresponding current limiter device can be found in EP 0 345 767 B1.
  • HTS material high-temperature superconductor material
  • the current exceeds the critical current I c of the superconductor material, which as a result assumes a finite electrical resistance (so-called “quench”).
  • the resulting heat of current quickly heats the superconductor material beyond the transition temperature T c , the now high normal-conducting resistance of the superconductor material limiting the fault current to a low value.
  • the critical current I 0 inevitably varies along the superconducting conductor track.
  • the shunt layer part which is in flat, conductive contact with the superconducting layer part in known current limiting devices is lower-ohmic than the normal-conducting superconducting layer part, consequently takes over the largest part of the fault current and reduces the heat generation per surface and the risk of damage in so-called “hotspots (of the respective quenched area).
  • a shunt requires a relatively large length of the superconducting switching path for a given voltage and a specific fault current, that is to say a correspondingly high expenditure of superconducting and normally conducting conductor material for the current limiter device. It must be taken into account here that in the known current limiting devices, the heat spread along the switching path is relatively slow.
  • the object of the present invention is to design the current limiter device with the features mentioned at the outset in such a way that the conductor expenditure can be reduced compared to known devices.
  • the heating should be above the transition temperature, i.e. normal management, quickly, especially in a period of below
  • the current limiter device with the features mentioned at the outset should have a shunt part which consists of a structure of graphitized carbon fibers with point-wise and / or line-like contact of the fibers with one another and the fibers with the superconducting layer part.
  • a lattice or a fabric or a net or a mesh or a web or a nonwoven or a mat can advantageously be provided as the fiber structure.
  • Corresponding fiber structures from short, cut or long fibers can be produced in a simple manner.
  • the fiber structure extending over the entire length of the conductor track advantageously covers at least 20% of the
  • Width of the superconducting layer part The projection of the fibers onto the surface is covered under a covering stood.
  • the fiber structure must be mechanically fixed on the superconducting layer part.
  • the fiber structure can advantageously be pressed onto the superconducting layer part by means of a grid or perforated plate or by means of a network structure. Instead, fixation with an adhesive or varnish is also possible.
  • the superconducting layer part can advantageously be provided with a thin, preferably at most 0.1 ⁇ m thick covering layer made of a normally conductive material such as e.g. Au or Ag or Cu can be coated, the specific electrical resistance in the current carrying direction is greater than that of the fiber structure.
  • a covering layer can be used to protect the superconducting layer part and to reliably contact it.
  • a thickness of the fiber structure between 0.05 and 0.5 mm can advantageously be selected. It was recognized that such thin fiber structures can ensure the required uniform and rapid heat spreading.
  • the mean specific electrical resistance of the fiber structure should advantageously also be between 0.5 and 20 ⁇ -m, preferably between 1.0 and 10 ⁇ -m, in the direction of current flow at the operating temperature of the superconductor material.
  • An electrically insulating material can advantageously be selected for the carrier body.
  • a carrier body which consists partly of electrically conductive material and partly facing the conductor track made of electrically insulating material.
  • carrier bodies can be used for a current limiter device according to the invention.
  • One of the known metal oxide high-T c superconductor materials is preferably provided for the superconducting layer part.
  • superconducting layers made of one of the known metallic superconducting materials can also be used for the resistive current limiter device according to the invention.
  • FIG. 1 schematically shows in longitudinal section a current conductor track of a known current limiter device in the case of a quench
  • FIG. 2 shows the temperature conditions in this conductor track according to FIG. 1 as a diagram
  • FIG. 3 shows in longitudinal section a section of a current limiter device according to the invention, FIG. 4 of this section according to FIG. 3 in supervision and FIG. 5 as a diagram of the temperature distribution in this section according to FIG. 3 or 4.
  • Corresponding parts in the figures are each provided with the same reference numerals.
  • FIG. 1 is the current conductor track 2 of a known current limiter device (for example based on the EP-B1 document mentioned at the beginning).
  • the electrical conductor track is located on a carrier body 3 made of an electrically non-conductive material. It comprises a superconducting layer part 2a which is deposited on the carrier body 3 and structured to form the conductor track 2 and which is covered by a shunt layer part 2b.
  • the superconductor material can be known metallic low-T c superconductor material or metal oxide high-T c superconductor material.
  • the Shunt layer part 2b consists of known normal-conducting material which is usually used to stabilize superconductors. As is further indicated in the figure, a current I flows through the superconducting layer part 2a.
  • the superconducting layer part Since the superconducting layer part has changed into the normally conductive state in a (“hotspot *) region 4 or quench region with a small extent B, the current there changes into the Shunt layer part 2b due to its comparatively lower resistance compared to the normal conducting resistance of the superconducting layer part.
  • Figure 2 shows the corresponding temperature conditions or heating in a diagram.
  • the temperature T in the superconducting layer part and the dimension x of the conductor track in the direction of current flow are plotted in the ordinate direction.
  • FIGS. 3 and 4 show a preferred embodiment of a current limiter device 10 designed according to the invention, while from FIG. 5 the temperature relationships thereof are shown in a quench area in a representation corresponding to FIGS. 1 and 2.
  • a special shunt part 12b on its superconducting layer part 2a.
  • This shunt part is supposed to be a structure made of graphitized carbon fibers, which is applied flatly on the superconducting layer part 2a.
  • the fiber structure can in particular have the form of a grid or a fabric or a net or a braid or a web or a fleece or a mat.
  • the fibers 12a or fiber pieces only make up this structure from a relatively loose structure, there is a point-wise and / or line-like contact of the fibers with one another and the fibers with the superconducting layer part 2a.
  • an average specific electrical resistance between 0.5 and 20 ⁇ -m, preferably between 1.0 and 10 ⁇ -m, is to be formed in the direction of current flow of the conductor track 12 at an operating temperature of the superconducting device of, for example, 77 K.
  • the fiber structure can thus represent the shunt part 12b or a bypass for thermal protection by passing the current past a point 4 in the superconductor material that has become normal.
  • the electrical resistance is considerably smaller than that of the superconducting layer part that has become normally conductive. This resistance of the shunt part is set by the thickness d s of the fiber structure and the electrically effective area proportion ⁇ of the longitudinal fibers in the structure.
  • the point-by-point or line-like electrical contacts between the individual fibers 12a with one another and with the superconducting layer part 2a ensure the required transfer of the current I from the superconductor material into the fiber structure over a length b that is over the corresponding length of a quench area 4 over its two sides goes.
  • the desired dissipation then occurs in the fiber structure, which a normal line can trigger in the initially superconducting superconducting material. In this way, the normal line spreads quickly over the entire length of the conductor track in the superconducting layer part.
  • a grid or perforated plate 13 made of insulating material can be provided, for example as shown in FIG. 3, which is pressed onto the superconducting layer part, for example with the aid of spring elements 14 with adjustable spring pressure.
  • the plate 13 is sufficient for a coolant that keeps the superconducting material at its operating temperature transparent.
  • the transition length b is determined by measurements and can be varied by the contact pressure.
  • the fiber structure can also be pressed onto a still liquid adhesive or lacquer layer applied to the superconducting layer part 2a until hardening.
  • the transition length b is measured, if necessary, and adjusted via the contact pressure.
  • the transition length is further adjustable.
  • the superconducting layer part 2a can also be at least partially covered with a thin metallic layer.
  • the specific electrical resistance of the material of this layer should be greater than that of the fiber structure acting in parallel. Alloys such as e.g. with Au, Ag or Cu in question.
  • the thickness of such a cover layer should be less than 0.1 ⁇ m.
  • FIG. 4 shows the part of the superconducting device 10 according to FIG. 3 in supervision.
  • This illustration shows, in particular, the transparency of the coolant of the carbon fiber structure serving as shunt part 12b.
  • the carbon fiber structure serving as the shunt part 12b should, however, cover at least 20% of the surface of the superconducting layer part 2a in order to be able to guarantee the required heat spreading.
  • FIG. 5 The widening of the current transition region b in a quench region 4 compared to the prior art according to FIGS. 1 and 2, which can be achieved with the use of a carbon fiber structure according to the invention, can be seen from the diagram of FIG. 5 corresponding representation.
  • a meandering superconducting layer part 2a made of single-crystalline can first be used to form a current limiter on a ZrO 2 plate of 10 ⁇ 10 cm 2 as carrier body 3
  • this layer part is at least largely congruent with a 0.05 to 0.1 mm thick carbon fiber fabric or fleece 12b made of a cut-out fiber structure and pressed through a perforated plate via springs or glued on under pressure.
  • the fiber structure ends on metallized contact layers (“contact pads *) at the ends of the switching path or conductor track, where it is electrically connected to the superconducting layer part underneath and to the necessary power supply lines.

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  • Emergency Protection Circuit Devices (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

La présente invention concerne un dispositif de limitation de courant (10) qui comprend un corps de support (3) sur lequel se trouve une piste conductrice (12) présentant une partie de couche de supraconductivité (2a) et une partie de shunt (12b). La partie de shunt doit être une structure composée de fibres de carbone graphitées (12a) qui sont en contact les unes avec les autres de manière ponctuelle et/ou linéaire et avec la partie de couche de supraconductivité (2a). On peut notamment utiliser un tissu, un non-tissé, une tresse ou un maillage en tant que structure de fibres.
PCT/DE2003/001754 2002-06-13 2003-05-28 Dispositif de limitation de courant resistif a piste supraconductrice et shunt non supraconducteur WO2003107448A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10226390A DE10226390B4 (de) 2002-06-13 2002-06-13 Resistive Strombegrenzereinrichtung mit supraleitender Leiterbahn und nicht-supraleitendem Shunt
DE10226390.6 2002-06-13

Publications (1)

Publication Number Publication Date
WO2003107448A1 true WO2003107448A1 (fr) 2003-12-24

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DE (1) DE10226390B4 (fr)
WO (1) WO2003107448A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2494990A1 (fr) 2005-06-03 2012-09-05 Ono Pharmaceutical Co., Ltd. Agent pour la régénération et/ou la protection des nerfs
CN109300610A (zh) * 2018-11-09 2019-02-01 广东电网有限责任公司 一种超导带材表层、超导带材及超导线圈

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006110382A2 (fr) * 2005-03-31 2006-10-19 American Superconductor Corporation Stabilisateur de type treillis pour supraconducteurs recouverts de filaments

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345767A1 (fr) * 1988-06-10 1989-12-13 Asea Brown Boveri Ab Dispositif pour limiter l'excès de courant
EP1063712A2 (fr) * 1999-06-25 2000-12-27 Abb Research Ltd. Composite supraconducteur à haute température
EP1107323A2 (fr) * 1999-12-02 2001-06-13 Abb Research Ltd. Dispositif supraconducteur à haute température

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD126232A1 (fr) * 1976-06-19 1977-07-06
US4975413A (en) * 1987-08-12 1990-12-04 Amoco Corporation Superconductor-coated carbon fiber composites
DE19856425A1 (de) * 1997-12-08 1999-07-01 Cryoelectra Ges Fuer Kryoelekt Hochtemperatursupraleiter, Fehlerstrombegrenzer mit einem Hochtemperatursupraleiter und Stromversorgung, beispielsweise für einen HTSL-Magneten
DE10027243A1 (de) * 2000-05-31 2001-12-06 Abb Research Ltd Hochtemperatursupraleiteranordnung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345767A1 (fr) * 1988-06-10 1989-12-13 Asea Brown Boveri Ab Dispositif pour limiter l'excès de courant
EP1063712A2 (fr) * 1999-06-25 2000-12-27 Abb Research Ltd. Composite supraconducteur à haute température
EP1107323A2 (fr) * 1999-12-02 2001-06-13 Abb Research Ltd. Dispositif supraconducteur à haute température

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2494990A1 (fr) 2005-06-03 2012-09-05 Ono Pharmaceutical Co., Ltd. Agent pour la régénération et/ou la protection des nerfs
CN109300610A (zh) * 2018-11-09 2019-02-01 广东电网有限责任公司 一种超导带材表层、超导带材及超导线圈

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DE10226390A1 (de) 2004-01-08
DE10226390B4 (de) 2004-07-22

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