how to calculate power factor in transformer?

To calculate the power factor in a transformer, you need to determine the real power (P) and the apparent power (S). The power factor (PF) is then calculated using the formula: PF = P / S. Real power is measured in watts (W), while apparent power is measured in volt-amperes (VA). You can find these values using the transformer’s voltage, current, and phase angle. A power factor close to 1 indicates efficient transformer operation.