Electrical Stress on the Medium Voltage Medium Frequency Transformer

This paper proposes an equivalent circuit model to obtain the transient electrical stress quantitatively in medium voltage frequency transformers modern power electronics. To verify this model, simulation is performed on a 1.5 kV/1 kHz transformer, revealing overshoot between turns and layers of transformer’s HV winding. Effects rise time input pulse voltage, stray capacitance winding insulation, their interactions overshot magnitude are presented. With these results, we propose limiting and, thereafter, enhancing insulation capability, which throws light design. Additionally, guidance future studies aging endurance lifetime could be given.