What is the impedance of a transformer rated at 2400/4160Y-120/240 that reaches full load current on the secondary side when applying 40 volts to the high side?

To determine the impedance of the transformer based on the information given, you first need to understand how to calculate impedance using the rated values and the conditions of full load current.

The transformer is rated at different voltages on the primary (2400/4160Y) and secondary (120/240) sides. When applying 40 volts to the high side, we can analyze how this relates to the full load current conditions on the low side.

The relationship between the high voltage to low voltage in a transformer is given by the turns ratio. In this case, the rated output voltage on the high side (2400V or 4160Y) can be directly linked to the corresponding secondary side (120/240V). The full load current flows based on how the transformer transforms the voltage from high to low while maintaining power equilibrium.

At full load on the secondary side, if we are applying 40 volts to the primary, we would first determine the secondary voltage that corresponds to this condition. Using the transformation ratio, we can deduce this voltage drop. The impedance percentage can be calculated by considering the rated full load current and the voltage across the transformer when operating under these conditions.

The percentage impedance is typically calculated as:

Impedance % =