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Assume that a 250 kVA distribution transformer is used for single-phase pole mounting. The transformer is connected phase-to-neutral 7200 V on the primary and 2520 V phase-toneutral on the secondary side. The leakage impedance of the transformer is 3.5%. Based on the given information, determine the following:
a. Assume that the transformer has 0.7 pu A in the HV winding. Find the actual current values in the HV and LV windings. What is the value of the current in the LV winding in per units?
b. Find the impedance of the transformer as referred to the HV and LV windings in ohms.
c. Assume that the LV terminals of the transformer are short-circuited and 0.22 per unit voltage is applied to the HV winding. Find the HV and LV winding currents that exist as a result of the short circuit in per units and amps.
d. Determine the internal voltage drop of the transformer, due to its leakage impedance, if a 1.2 per unit current flows in the HV winding. Give the result in per units and volts.
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