The Effects of External Pressure on the Thermal and Electrical Properties of Stacked GdBCO Coated Conductor Tapes

Abstract

This study examined the effects of external pressures on the thermal and electrical stabilities of stacked GdBCO CCs through quench tests. The minimum quench energies and two-dimensional normal zone propagation velocities of stacked GdBCO CCs connected electrically in series under various external pressures were examined. The quench test results showed that the minimum quench energy increased with increasing the external pressure. Longitudinal normal zone propagation velocities were greater than transverse normal zone propagation velocities. Moreover, normal zone propagation velocities increased with increasing applied pressure implying that applied pressure resulted in increased layer-to-layer thermal contact that allowed hot spots to dissipate more easily.Index Terms-GdBCO CC, minimum quench energy (MQE), normal zone propagation (NZP), thermal/electrical stability.

Effects of turn-to-turn compactness in the straight sections of HTS racetrack coils on thermal and electrical characteristics

“…Unfortunately, the turnto-turn compactness of straight sections in these coils is relatively attenuated compared to those of round sections, because of the anisotropic pressure toward the bobbin surface during winding. This may cause mechanical problems, such as wire deformation by the large electromagnetic force as well as by the torque [8][9][10][11][12].…”