Design of saturated iron core superconducting fault current limiter based on numerical calculation

The saturated iron core superconducting fault current limiter (SCFCL) utilizes the non-linear of ferromagnetic hysteresis to change its inductance. Its cores are saturated deeply under normal operation but driven out of saturation whenever fault occurs, so it is very difficult to design this SCFCL through theoretical calculation and there will be biggish error if deal the magnetization curve with subsection linearization. In this paper, incorporating the Jiles-Atherton hysteresis model which can describe the actual measured hysteresis very well and constructing the dynamic differential equations of a circuit comprising this SCFCL, we put forward a new design method by numerical calculating the dynamic equations with computer. We also set forth the systematization design step and introduce a model designed using the technique. The design computation curves, which are agree well with the experimental date, are presented too. This paper shows that the design method is effective and can well forecast the limiting-current result of this SCFCL.