Insulation effect on thermal stability of Coated Conductors wires in liquid nitrogenстатья
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Дата последнего поиска статьи во внешних источниках: 11 мая 2017 г.
Аннотация:Superconducting wires are not perfectly homogeneous in term of critical current as
well as stabilization. In resistive fault current limiter applications this could lead to hot spots if
the fault current is only slightly above the nominal current of the device. Increasing stabilization
by using thicker silver coating for example may prevent this problem but this method implies
longer wire length to maintain the same impedance during a fault. Very efficient cooling in
another way to prevent hot spots, this can be achieved in nucleate boiling regime. Optimal
insulation can be used to prevent film boiling regime, staying in nucleate boiling regime in a
much broader temperature range. In this work a novel technique is used to monitor in real time
the temperature of the wire during the quench. Using this method several increasing insulation
thicknesses are tested, measuring for each the heat exchange rate to the nitrogen bath. Exchange
rate measurements are made in quasistatic regime and during the re-cooling of the wire. SuperOx
wires provided with different insulation thicknesses exhibit an excellent stability, far above a
bare wire. On the other side, for very thick insulations the stability gain is lost. Re-cooling speeds
dependency on insulation thicknesses is measured too.