Mitigating Transformer Inrush Currents Using Passive Magnetic Fault Current Limiter

Transformer inrush current, a transient phenomenon characterized by high peaks and harmonic content that happens during energization, can have a big effect on how the power system works. It can result in core saturation, protective relay malfunctioning issues, and excessive stresses on transformer windings. Because transformer inrush current has a major effect on protection systems, it has been the focus of much research. To minimize this problem, a novel Passive Magnetic Fault Current Limiters, or PMFCLs, offer a viable remedy. To reduce transient currents, the PMFCL adds dynamic impedance in series with the transformer using the magnetic saturation principle. This paper examines the effects of passive MFCLs on power system performance and examines how well they restrict transformer inrush current, thereby improving the performance and reliability of transformer protection systems. First the PMFCL’s construction and operation are examined and the ANSYS Maxwell software and finite-element analysis(FEA) was used for the PMFCL design. Then MATLAB/Simulink is used to do comprehensive simulations for the transformer’s inrush current mitigation with and without proposed PMFCL unit.