The OC and SC test on a 500 kVA, 69 kV/4.16 kV, 60 Hz transformer, gave the following data. OC Test with the meters in the LV side: 4.16 kV, 2A, 5 kW. SC Test with the meters in the HV side): 2.6 kV, 4 A, 2.4 kW. A) Draw the approximate equivalent circuit referred to the LV side with all the values of the transformer impedances; B) Calculate the percentage voltage regulation?