Title :
Application of high-T/sub c/ superconductor to current limiting devices
Author :
Ikegami, T. ; Yamagata, Y. ; Ebihara, K. ; Nakajima, H.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Kumamoto Univ., Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
Resistive characteristics of YBa/sub 2/Cu/sub 3/O/sub 7-x/ superconductor thin film quenched by a current was investigated. Thin films prepared on MgO substrates by the laser ablation method were used, and their current-resistance characteristics under current-quenching were investigated. A resistance appeared quickly above a critical current and then increased to about 8 Omega within few milliseconds, which depended on input power to the film. To investigate characteristics of the current-quenched superconducting film, a one-dimensional heat transfer equation was numerically solved using a finite-difference method. By comparing these experimental and numerical results it was found that nonuniformities in current density or temperature may exist in the quenching thin film.<>
Keywords :
barium compounds; critical current density (superconductivity); current limiting reactors; finite difference methods; heat transfer; high-temperature superconductors; pulsed laser deposition; quenching (thermal); superconducting devices; superconducting thin films; yttrium compounds; MgO substrates; YBa/sub 2/Cu/sub 3/O/sub 7-x/; critical current density; current limiting devices; current-quenching; current-resistance characteristics; finite-difference method; high temperature superconductor; laser ablation method; numerical model; one-dimensional heat transfer equation; superconductor thin film; Critical current; Current density; Equations; Finite difference methods; Heat transfer; Laser ablation; Substrates; Superconducting films; Superconducting thin films; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
