Reference

The short-circuit impedance ( Z_{01} ) of an electrical machine, such as a transformer, can be calculated using the results from a short-circuit test. The formula for calculating the equivalent impedance referred to the high voltage side is:

[ Z_{01} = \frac{V_{sc}}{I_{sc}} ]

Where:

• ( V_{sc} ) is the short-circuit voltage, which is the voltage applied to the primary winding to produce the rated current in the secondary winding when the secondary is short-circuited.
• ( I_{sc} ) is the short-circuit current, which is the current flowing through the secondary winding under short-circuit conditions.

This method is typically used in transformer testing to determine the equivalent impedance and other parameters like leakage reactance and resistance.

For more detailed information, you can refer to this source: Electronics Hub.