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CONTRIBUTIONS A L'ETUDE DES BOBINAGES SUPRACONDUCTEURS :
LE PROJET DGA DU SMES HTS IMPULSIONNEL

Abstract : In the context of a DGA (Délégation Générale pour l'Armement) contract with the company Nexans, the CRTBT-CNRS developed a superconductive winding for the storage of energy, or SMES (Superconducting Magnetic Energy Storage), with Bi-2212 PIT tapes operated at 20!K. The use of a superconductive winding makes possible to store the electric power in magnetic form without energy conversion and for very long times. Winding stores 800 kJ to be discharged in 1 s to reach a power of 500 kW on the load, which generates a maximum tension of 5 kV. Cryogenics is carried out with copper parts which connect the cryocoolers and winding, with a maximum temperature difference of 2 K. The HT (High Voltage) interface between the drains and winding has a dielectric strength of 5 kV which makes possible to effectively cool the current leads and the 26 pancakes, made of 40 km of conductor. The dissipated energy in the copper and winding during the discharge is 1 % of stored energy. Thermal measurements at 20 K were carried out on samples to measure HT interface for example, then on a winding of reduced size to validate the adopted solutions. The soldering process of the superconductive tapes developed by Nexans makes it possible to adapt the geometry of the conductor to its situation in winding. The tests of the first ten pancakes validate developed cryogenics. The study of extrapolation for a 20 MJ SMES present finally a toroidal geometry adapted to a cooling by thermosiphon with a two-stage cable Rutherford/6+1 made of Bi-2212 round wire.
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Submitted on : Friday, October 12, 2007 - 11:17:08 AM
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Boris Bellin. CONTRIBUTIONS A L'ETUDE DES BOBINAGES SUPRACONDUCTEURS :
LE PROJET DGA DU SMES HTS IMPULSIONNEL. Energie électrique. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00178786⟩

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