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Limitation de courant à partir de matériaux supraconducteurs HTC

Abstract : This report deals with the possibility to use HTc superconductors for current limitation. The transition from a superconductive to a high dissipative state could be used to limit inrush currents. This application of superconductivity is very attractive because it's an innovative device for electrical networks without any conventional equivalence at high voltage. This device would allow to improve the density of connections and the continuity of the electrical distribution. This study can be divided into two fields. The aim of the first one is to analyse the behaviour of different HTc superconductors for current limitation. We carried out experimental measurements to characterise those conductors during a nominal AC rating (measurements of losses) and during a fault setting. Particularly, a description of the transition in bulk textured YBCO samples near Tc was made of inhomogeneous transition of the device and to estimate its losses. Finally, a 1 kV / 100 A demonstrator made of 43 meanders of textured YBCO was tested at 90,5 K. Thermal gradients seem to be responsible of the altering of some of the samples. The other part of this study concerns the dynamic of the transition. Near Tc, our experiments showed that the transition is more homogeneous. Experimental measurements also showed the influence of thermal exchanges with the cryogenic surrounding on the transition. This point can be justified if the dissipated energy is locally concentrated.
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https://tel.archives-ouvertes.fr/tel-00004211
Contributor : Nathalie Le Moulec <>
Submitted on : Monday, January 19, 2004 - 11:19:30 AM
Last modification on : Friday, November 6, 2020 - 4:12:56 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:24:17 PM

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  • HAL Id : tel-00004211, version 1

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Didier Buzon. Limitation de courant à partir de matériaux supraconducteurs HTC. Supraconductivité [cond-mat.supr-con]. Institut National Polytechnique de Grenoble - INPG, 2002. Français. ⟨tel-00004211⟩

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