Example 2-5. A 15-kVA, 2300/230-V transformer is to be tested to determine its excitation branch components, its series impedances, and its voltage regulation. The fol lowing test data have been taken from the transformer: Open-circuit test Short-circuit test (low voltage side) (high voltage side) Voc 230 V Vse 47 V loc se 60A Voc=50 W 160 W (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the equivalent circuit of this transformer referred to the low-voltage side (c) Calculate the full-load voltage regulation at 0.8 lagging power factor. 1.0 power factor, and at 0.8 leading power factor using the exact equation for V (d) Plot the voltage regulation as load is increased from no load to full load at power factors of 08 lagging 10, and 08 leading fe) What is the efficiency of the transformer at full load with a power factor of 0.8 lagging?