The following data are obtained when open-circuit and short-circuit tests are performed on a single-phase, 50-kVA, 2400/240-volt, 60-Hz distribution transformer

a)      Neglecting the exciting admittance, determine the equivalent series impedance referred to the high-voltage side.

In this part, we have to find the equivalent series impedance and this can be find with the help of short circuit test. For this the equivalent circuit will be like this

 a)      Determine the pp. values of the series impedance and exciting admittance by using 50-kVA and 2400 V as base values. Draw the equivalent p.u. circuit.

All values has been found in the above section now according to that the equivalent T circuit will be like that

The figure below belongs to a three-phase two-winding transformer rated at 500kVA, 4160-Δ/480-Y V with a percentage impedance (% IZ) of 5.62%. The percentage impedance is the percentage of primary voltage that results in full load secondary winding current with the secondary winding terminals short-circuited.