Melt textured superconductors: Tailoring properties for current limitation

Obradors, X.; Puig, T.; Granados, X.; Mendoza, E.; Teva, J.; Calleja, A.; Serradilla, I. G.; Segarra, M.; Oyarbide, E.
May 2002
AIP Conference Proceedings;2002, Vol. 614 Issue 1, p331
Academic Journal
The Fault Current Limiter (FCL) is one of the most promising devices for the electrotechnical applications of High Temperature Superconductors. Several designs and materials alternatives have been considered for integration into this system. In this work we review first the concept of FCL and then we report the progress carried out in the development of bulk Melt Textured Growth (MTG) YBCO for resistive and hybrid FCL. The main problem of using MTG YBCO ceramics in current limitation at 77 K is that the high critical currents can generate hot spots. Our strategy to minimize this problem has been either to dope MTG bars, grown by the Bridgman technique, with metallic ions (Mg, Zn, Ni) which reduce T[sub c] and hence J[sub c] or to dimension the triggering element to the quench size around electrical contacts. The chemical and superconducting homogeneity of these elements were tested and the performances for current limitation were analyzed. Quench currents up to 4000 A were measured in undoped YBCO bars. On the other hand, we found that electrical fields as high as ... 1000 V/m can be safely developed with MTG bars having tailored critical currents. The integration of these superconducting elements into resistive and hybrid superconducting FCL will be discussed and the testing of a 400 kVA hybrid FCL system will be reported.


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