Properties of YBCO films at high current densities: fault current limiter implications

Article Article scientifique Article Properties of YBCO films at high current densities: fault current limiter implications eng 2001 author Decroux Michel André 25593 author Antognazza Louis 23431 author Musolino Nicolas 97582 author de Chambrier E. author Reymond S. author Triscone Jean-Marc 21933 author Fischer Oystein 25258 author Paul W. author Chen M. 2046-2049 10.1109/77.920257 1051-8223 http://ieeexplore.ieee.org/document/920257/ We have studied the properties of superconducting strip lines, based on epitaxial YBCO thin films, at high current densities. Experiments performed with short constant current pulses show that a quasi spontaneous highly dissipative state (HDS) appears at high current densities. By carefully measuring the temperature of the YBCO line, we found that its temperature is still below T/sub c/ when the HDS occurs, indicating that this state does not originate from a thermal runaway. Once initiated, this HDS starts to propagate with an initial velocity larger than 100 m/s, which is one order of magnitude higher than thermal velocities. We also applied constant voltage pulses to the YBCO line, therefore simulating a real short circuit. We found that the spatial extent of the HDS along the line, a few microseconds after the short circuit, depends linearly on the applied voltage. These results allow explanation of the fast switching properties observed in superconducting fault current limiters (SFCL) and the fact that the peak current is limited at, typically, 3 times the critical current. Fault Currents Superconducting Devices Superconducting thin Films Superconductors (high temperature) Dewey 500.2 33 Département de physique de la matière quantique 131 false 784 Groupe Triscone IEEE Transactions on Applied Superconductivity 11 1 1d477e15-40cd-41e3-b922-15ca961c00c0 Article (Published version) Restricted 00920257_002.pdf 401698 application/pdf restrictedAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Properties of YBCO films at high current densities: fault current limiter implications	IEEE Transactions on Applied Superconductivity			2001	541	1

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