This paper describes the design of a middle-frequency power transformer, its material composition and magnetic circuit windings, operating in frequency range 800 to 2000Hz, with capacity 200kVA, air-cooled, be fed from suitable converter, characterized by reduced noise. The proposed solution allows implementation galvanically isolated DC-DC converters for auxiliary traction drives other convert...

High-frequency current transformers (HFCT) are well suited as sensors for measuring transient signals on power cables, such partial discharges (PD). If the HFCT is designed and its measurement bandwidth matches of signal to be measured, high sensitivities can achieved. However, optimizing design a specific difficult task because various parameters affect transfer function. In addition, there li...

In this paper, a novel method for loss reduction and efficiency optimization of the high frequency flyback transformers is proposed based on rearrangement of the windings. According to detailed analysis of the high frequency flyback transformer using FEM technique, a novel and simple approach for its design improvement and loss reduction is introduced. It is shown that leakage flux scattering i...

this paper proposes a flexible power electronic transformer (fpet) for the application in the micro-grids. the low frequency transformer is usually used at the point of common coupling (pcc) to connect the low voltage grid and utility network to each other. the conventional 50hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. in this pap...