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
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
  • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
  • H01B12/06—Films or wires on bases or cores
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
  • H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
• • 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 superconducting electrical cable which has at least one superconducting conductor consisting of strips or wires, which are wound in at least one layer around a carrier designed as a tube (WO 03/052775 A1).
• a superconducting cable in today's technology has electrical conductors of a composite material containing ceramic material which changes to the superconducting state at sufficiently low temperatures.
• the electrical DC resistance of a correspondingly constructed conductor is zero with sufficient cooling, as long as a certain current, the critical current, is not exceeded.
• Suitable ceramic materials are, for example, rare earth oxide (ReBCO), in particular YBCO (yttrium-barium-copper-oxide), or BSCCO (bismuth-strontium-calcium-copper-oxide).
• ReBCO rare earth oxide
• YBCO yttrium-barium-copper-oxide
• BSCCO bismuth-strontium-calcium-copper-oxide
• Sufficiently low temperatures to bring such a material into the superconductive state are, for example, between 67 K and 1 10 K.
• Suitable coolants are, for example, nitrogen, helium, neon and hydrogen or mixtures of these substances.
• the known cable according to the aforementioned WO 03/052775 A1 has a superconductive conductor which is formed around at least one layer around a pipe.
• the cable includes additional layers surrounding the conductor. It is, leaving a free space in a two coaxial with each other arranged metallic tubes between which a vacuum insulation is located existing cryostat. A coolant causing the superconductive state of the conductor can be passed through the tube and through the free space of the cryostat.
• the conductor of a superconductive cable consists, in a known technique, of strips or wires of superconducting material which are wound in at least one layer around a carrier, for example around a tube.
• the superconducting conductor material shrinks by about 0.25% to 0.3%.
• this can lead to a shortening of the conductor by about 1.5 m to 1.8 m.
• the superconducting cable and thus its conductor is fixed at its ends in connection fittings.
• the significant shortening of the conductor due to the cooling leads to a considerable tensile load on the connection fittings. It can also easily lead to overstretching of the conductor or its individual elements and thus to damage, through which the conductor is unusable.
• the invention has for its object to make the above-described cable so that temperature-induced changes in length of the conductor can be compensated in a simple manner.
• the tube is elastically deformable and has a extending over its entire length, extending in the axial direction gap.
• the tube used as a carrier of the conductor is elastically deformable so that its diameter can be reduced in an externally applied radial pressure load. This is ensured by the extending in the longitudinal direction of the tube gap, which is dimensioned sufficiently wide at room temperature, so that it can constrict during cooling of the conductor or maximum close completely. The reduction during cooling the conductor thus acts essentially in the radial direction to its carrier, so that the connection fittings at the ends of the cable no significant tensile loads are exercised. Since the tube is elastically deformable, the gap expands upon reduction or in extreme cases elimination of the radial load of the tube, so that the diameter of the tube is larger again.
• the conductor of the superconducting cable is thus regardless of its length during cooling or warming constantly on the surface of the permanently acting as a carrier tube.
• the words "elastically deformable" in the context of the invention mean that the tube constantly presses against the same surrounding conductor, so in the broadest sense has resilient properties.
• the width of the gap which is required for a tube acting in the above sense at room temperature, can be calculated or specified depending on the diameter of the tube, the material thereof and the difference between room temperature and operating temperature of the cable in the superconducting state.
• Fig. 1 shows a cross section of an arrangement with a superconducting cable.
• Fig. 2 can be used for a superconducting cable according to the invention tube as
• FIGS. 3 and 4 with respect to FIG. 2 modified embodiments of the tube.
• FIG. 1 shows a basic structure of a superconducting cable SK arranged in a cryostat KR.
• the cable SK has a superconductive conductor 1, which is formed around a designed as a support tube 2.
• the conductor 1 is surrounded by a dielectric 3, over which a superconducting screen 4 is arranged.
• the cryostat KR consists of two coaxially arranged metallic tubes 5 and 6, between which a vacuum insulation 7 is located.
• the cryostat KR encloses the cable SK and a free space FR for passing a coolant.
• the tubes 5 and 6 of Kryost ⁇ ts KR are advantageously made of stainless steel. They can be corrugated transversely to their longitudinal direction.
• Conductor 1 and shield 4 may consist of conventional superconducting materials, in particular of the materials YBCO and BSCCO mentioned in the beginning.
• the conductor 1 is advantageously made of superconductive tapes or wires wound around the tube 2 in at least one layer.
• the dielectric 3 is constructed in conventional technology.
• the cable SK in the embodiment of Fig. 1 is a superconducting cold dielectric cable.
• the tube 2 used as a carrier for the conductor 1 is elastically deformable in the sense described above, in particular in the radial direction with a variable diameter.
• the tube 2 is in a preferred embodiment made of stainless steel, copper or aluminum or their alloys. It may advantageously consist for example of a beryllium-copper alloy. It may, according to Fig. 4, be corrugated transversely to its longitudinal direction.
• the tube 2 has a gap 8 extending over its entire length, which extends in a straight line along a surface line of the tube according to FIG. 2.
• the gap 8 can also be helical, preferably with a large pitch angle as shown in FIG. 3.
• the width of the gap 8 can be calculated, for example, as follows:
• L ⁇ l LS 2 + Tt 2 D 2 given.
• LK »L.
• the conductor in the superconducting cable SK, the conductor should be wrapped around a 25 mm diameter pipe 2 made of stainless steel.
• the diameter DK of the cold tube 2 is then 24.58 mm.
• the material to be used in the tube 2 is ideally designed so that no shrinkage or only very slight plastic deformation occurs when the gap 8 is narrowed by shrinkage. This can be achieved by a suitable choice of materials with corresponding wall thicknesses.

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• Superconductors And Manufacturing Methods Therefor (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)

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• 2009
  • 2009-03-25 EP EP09290218A patent/EP2234122B1/de not_active Not-in-force
  • 2009-03-25 DK DK09290218.8T patent/DK2234122T3/da active
  • 2009-03-25 AT AT09290218T patent/ATE517423T1/de active
• 2010
  • 2010-03-05 RU RU2011136089/07A patent/RU2479055C1/ru not_active IP Right Cessation
  • 2010-03-05 CN CN2010800132937A patent/CN102362316B/zh not_active Expired - Fee Related
  • 2010-03-05 WO PCT/EP2010/052813 patent/WO2010108771A1/de not_active Ceased
  • 2010-03-05 JP JP2012501227A patent/JP2012523065A/ja active Pending
  • 2010-03-05 KR KR1020117018885A patent/KR20110137769A/ko not_active Ceased
  • 2010-03-05 US US13/146,697 patent/US8655424B2/en not_active Expired - Fee Related

Patent Citations (5)

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