首页|Non destructive quench of bulk YBaCuO in liquid argon
Non destructive quench of bulk YBaCuO in liquid argon
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NSTL
The superconducting fault current limiter (FCL) isparticularly attractive since no conventional limiting device existsfor high voltage networks and thus corresponds to a real need.YBCO is a good candidate for current limitation due to its largecritical current density and its large normal state electric field. Thismaterial is, however, very sensitive to hot spots in liquid nitrogen.An operation at higher temperatures decreases the critical currentdensity and consequently reduces local heating (hot spots). Tests inliquid argon (87.3 K) were carried out. The critical current densityremained large (about 50 MAm-2, 0 T). For instance the limitingcurrent is much higher (11-15 times) than the critical current butto our knowledge, it is the first time that a non destructive quenchwas observed in bulk YBCO mono-domain sample. The power andenergy per unit volume developed during the transition reached 75GWm-3 and 350 MJm-3 respectively. These values are largeenough to induce an effective current limitation and weak enoughto restrict overheating and resulting destruction. In this paper wereport measurements and their analysis and show a new andhopeful way to improve YBCO limitation efficiency.
NSTL
