DC dual reactor type superconducting fault current limiter using switching operation of YBCO thin films

Abstract

In this paper, we propose DC dual reactor type superconducting fault current limiter (SFCL) using switching operation of YBa2Cu3OX–7(YBCO) thin films. The proposed DC dual reactor type SFCL consisted of a bridge diode, inductively coupled two coils and YBCO thin films. Two coils, each of which was connected in series with an YBCO thin film, were wound in parallel to the opposite winding direction. DC dual reactor type SFCL using the switching operation of YBCO thin films do not require the interrupter and its controller for the detection of the fault current unlike the conventional DC reactor type SFCL. In addition, the magnetic coupling between two coils in the DC dual reactor type SFCL can not only contribute to the equal balancer for currents passing through each coil before a fault accident but also achieve the balanced power burden between two YBCO thin films during a fault time. Through the experiments, the fault current limiting characteristics of the DC dual reactor type SFCL were investigated and its merits were described. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)