The saturated-core fault current limiter (SFCL) is widely used to limit the fault current.\nHowever, in the conventional SFCL structure, alternating current (AC) and direct current (DC) coils\nare wound on different loosely coupled cores. Owing to the leakage inductance, the traditional\nstructure demonstrates relatively large demand for DC excitation power and excessive impedance\nduring saturation. In this study, a new structure for winding closely coupled DC and AC coils\non the same core in three phases is proposed to reduce the influence of leakage reactance on\nthe SFCL performance. The leakage magnetic flux generated by both structures is analyzed by\nperforming finite element analysis simulations and utilizing a magnetic field division method.\nThe impedance of the limiter is measured at different DC currents and air gaps to optimize its\ndynamic performance. A fabricated prototype of the proposed limiter exhibits smaller steady-state\nlosses and high current-limiting capability.
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