Using non-superconducting fault current limiter as inrush current limiter

In this paper, inrush current limitation of transformer using a bridge type fault current limiter (FCL) as inrush current limiter is proposed. The proposed ICL consists of three single phase sets of diode bridge, small non-superconductor and semiconductor switch parallel with a resistor. Because of quick damping of inrush current by resistance, this topology inserts a resistance in power system. By simple control circuit and fast operation of the proposed ICL, the maximum peak value of inrush current decreases in an acceptable level. Using small value of non-superconducting dc reactor reduces voltage drop on the FCL as inrush current limiter (ICL) and construction cost. PSCAD/EMTDC software is used for getting simulation results. These results show good capability of the proposed ICL to limit the inrush current of transformers.