抄録
As a equipment to limit the fault current in electric power system, superconducting fault current limiter (SC-FCL) is expected to be introduced. Since the SC-FCL was required to recover to superconducting state rapidly after current interruption, it is important to understand the recovery characteristics of SC-FCL. In this paper, the recovery characteristics of SC-FCL in a 6.6 kV distribution system were theoretically investigated. We computed the time variation of superconducting cable temperature after quench and the recovery time for the commutation type of SC-FCL having the superconducting element connected to limiting resistor in parallel. The calculations were carried out for different conditions of system impedance, limiting impedance of SC-FCL and length of superconducting cable, considering the time-current characteristics of protective relay. As a result, it is found that the recovery time decreases with an increase in system impedance and with a reduction in limiting impedance of SC-FCL. Furthermore, the decrease in length of superconducting cable causes the increase in the recovery time.
