Study of the current-induced transition into a highly dissipative state: implications for the fault current limiter

摘要

The I-V characteristics of YBa2Cu3O7 (YBCO) superconducting lines have been measured up to very high current densities using current pulses, ranging from 10 mu s to 1 ms. When the current exceeds 2-3 times the critical current, an abrupt transition into a highly dissipative state occurs, whereas the temperature of the superconducting line is still well below T-c. This indicates that this transition is driven by the current. By increasing the pulse length, the propagation velocity of this initial dissipative state is determined. This velocity is an important parameter for the thin films resistive fault current limiter (FCL). (C) 2000 Published by Elsevier Science B.V. All rights reserved. [References: 4]