A power transformer is a static electrical device that converts AC voltage into different voltages with the same frequency. It generates alternating magnetic flux when alternating current is supplied to the primary winding, which induces AC electromotive force in the secondary winding through the iron core's magnetic conduction. The voltage is proportional to the number of turns in the primary and secondary windings. The rated capacity is the main parameter of a power transformer, representing the size of transmitted electric energy in kVA or MVA. The rated voltage is applied to the transformer to determine the rated current that does not exceed the temperature rise limit under specified conditions. The amorphous alloy core distribution transformer is an energy-saving option with a low no-load loss value. The core issue must be considered in the design process, including accurately selecting the characteristic parameters of the amorphous alloy during calculations.