In recent times with the increasing nature of short-circuiting ability in power system network by the advent of distributed generators imposes several adverse effects on the total system, due to severe increase in additional fault current accompanied by instantaneous voltage sag. In that situation the utility of superconducting fault current limiters (SFCL) in the power system is found to be an essential remedy to rectify severe continuous faults. In this paper a fault current limiter (FCL) circuit is presented which is very important for a three-phase power system. Hence, by using single high temperature superconducting coil, which is placed to the secondary windings of transformers via a thyristor bridge, should be represented as a fault current limiter (FCL) circuit. The proposed system modeled using Sim-Power System blocks in MATLAB/SIMULINK environment.

Keywords: Distributed generators (DGs), Fault current limiter (FCL), High temperature superconducting (HTS) coil, Superconducting fault current limiter (SFCL), Power distribution system, Instantaneous voltage sag, Thyristor