Patent ID: 9647450
Date: 2017-05-09
CPC Classifications: H02H,Y02E

Claim:
1. A fault current limiter (FCL) comprising: a first switching unit configured to block an applied fault current and switch a flow path of the fault current; a current limiting impedance unit configured to limit the fault current; a second switching unit configured to switch over a flow path of the fault current connected to the current limiting impedance unit such that the fault current flowing toward the current limiting impedance unit can be limited; and a controller configured to detect the fault current, compare the detected result with a preset reference value, and control the second switching unit according to the comparison result, wherein the second switching unit comprises: an auxiliary impedance portion connected in series to the current limiting impedance unit to form a series circuit, the auxiliary impedance portion comprising at least one auxiliary current limiting impedance element, and a current flowing portion connected in parallel to the series circuit, wherein the at least one auxiliary current limiting impedance element is configured to connect in series to the current limiting impedance unit to limit magnitude and duration of the fault current along with the current limiting impedance unit.