how to test impedance of transformer?

To test the impedance of a transformer, you can perform a short-circuit test. Connect the primary winding to a variable AC source while the secondary winding is shorted. Measure the current and voltage during the test. The impedance can be calculated using the formula ( Z = frac{V}{I} ), where ( V ) is the voltage applied to the primary and ( I ) is the current flowing through it. This method provides the transformer’s equivalent impedance under load conditions.