A superconducting cable having at least one phase and having: a) a layer of tapes of superconducting material; b) a tubular element of superconducting material for supporting said layer of tapes, said tubular element having at least one portion made of metallic material, and being in electrical cont
A superconducting cable having at least one phase and having: a) a layer of tapes of superconducting material; b) a tubular element of superconducting material for supporting said layer of tapes, said tubular element having at least one portion made of metallic material, and being in electrical contact with the layer of tapes of superconducting material; c) a cooling circuit adapted to cool the superconducting material to a working temperature not higher than its critical temperature, having a fluid at a predetermined working pressure ranging between a minimum value and a maximum value; wherein the deformation of said tapes of superconducting material, consequent to a temperature variation between the room temperature and the working temperature of the cable is lower than the critical deformation of the same tapes. A predetermined amount of conductive material of resistive type in electrical contact with the layer of superconducting material is present, such that the maximum temperature reached by the superconducting material in case of short circuit is lower than the minimum temperature between the critical temperature of the superconducting material and the boiling temperature of said cooling fluid at the minimum working pressure of said fluid.
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1. A superconducting cable having at least one phase comprising:a layer of tapes comprising superconducting material; a tubular element for supporting said layer of tapes, said tubular element comprising at least one portion made of metallic material and being in electrical contact with the layer of
1. A superconducting cable having at least one phase comprising:a layer of tapes comprising superconducting material; a tubular element for supporting said layer of tapes, said tubular element comprising at least one portion made of metallic material and being in electrical contact with the layer of tapes; a cooling circuit configured to cool the layer of tapes to a working temperature not higher than the critical temperature of the tapes, the cooling circuit comprising a fluid at a predetermined working pressure ranging between a minimum value and a maximum value, wherein deformation of the layer of tapes consequent to a temperature variation between room temperature and the working temperature is lower than critical deformation of the layer of tapes; and a predetermined amount of conductive material of resistive type in electrical contact with the layer of tapes, the conductive material being configured to cause a maximum temperature reached by the layer of tapes in case of a short circuit to be lower than the lesser of the critical temperature of the superconducting material comprising the layer of tapes and the boiling temperature of said cooling fluid at a minimum working pressure of said fluid wherein said tubular element is a composite and comprises a first metallic material and a second material associated to said first material and having a thermal expansion coefficient higher than that of said first material. 2. A superconducting cable according to claim 1, wherein said layer of tapes is incorporated within a metallic coating.3. A superconducting cable according to claim 2, wherein said superconducting material comprises at least one reinforcing foil made of metallic material.4. A superconducting cable according to claim 3, wherein said superconducting material comprises two reinforcing foils made of metallic material coupled to opposite faces of said layer.5. A superconducting cable according to claim 4, wherein the reinforcing foil and the metallic coating of said tapes comprising superconducting material is a metal selected from the group consisting of copper, aluminum, silver, magnesium, nickel, bronze, stainless steel, beryllium, and alloys thereof.6. A superconducting cable according to claim 3 or 4, wherein said superconducting material is essentially pre-stressed along a longitudinal direction.7. A superconducting cable according to claim 6, wherein the layer of superconducting material of said at least one tape comprising superconductive material has a pre-stress degree along a longitudinal direction (γ) of between 0.05 and 0.2%.8. A superconducting cable according to claim 6, wherein the reinforcing foil and the metallic coating of said tapes comprising superconducting material is a metal selected from the group consisting of copper, aluminum, silver, magnesium, nickel, bronze, stainless steel, beryllium, and alloys thereof.9. A superconducting cable according to claim 1, wherein the cable comprises a plurality of tapes comprising superconducting material spirally wound on the surface of said at least one supporting tubular element, said tapes having winding angles of between 5° and 60°.10. A superconducting cable according to claim 1, wherein said first and second materials are formed as adjacent annular sectors.11. A superconducting cable according to claim 10, wherein said annular sectors are arranged one after the other.12. A superconducting cable according to claim 10, wherein said annular sectors are spirally wound according to a winding angle of between 5° and 50°.13. A superconducting cable according to claim 1, wherein said first metallic material is a metal having a resistivity of 77 K<5*10?9 Ωm, a specific heat at 77 K>106 J/m3K and a heat conductivity at 77 K>5 W/mK.14. A superconducting cable according to claim 1, wherein said second material is a non metallic material having a thermal expansion coefficient higher than 17*10?6° C.?1.15. A superconducting cable according to claim 14, wherein said second non metallic material is a plastic material selected from the group consisting of polyamide, polytetrafluoroethylene and polyethylene.16. A conductive element for superconducting cables comprising at least one layer of superconducting material incorporated within a metallic coating supported by a tubular element comprising a predetermined amount of metallic material with which the layer is in electrical contact, said layer of superconducting material being cooled by means of a cooling fluid to a temperature not higher than the critical temperature of the layer, wherein a predetermined amount of conducting material of resistive type is present in electrical contact with the layer of superconducting material, such that a maximum temperature reached by the at least one layer of superconducting material in case of short circuit is lower than the lesser of the critical temperature of the at least one layer of superconducting material and the boiling temperature of said cooling fluid at a minimum working pressure of said fluid wherein said tubular element is a composite and comprises a first metallic material and a second material associated to said first material and having a thermal expansion coefficient higher than that of said first material.
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이 특허에 인용된 특허 (4)
Vulis Mikhail L. (Moscow SUX) Rybin Igor V. (Moscow SUX) Shenderovich Pavel B. (Moscow SUX) Golenchenko Valery A. (Moscow SUX) Shevchenko Igor S. (Moscow SUX) Schedrin Vladimir G. (Moscow SUX), Multisection superconducting cable for carrying alternating current.
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