A 100 kVA transformer is connected in parallel with an existing 250 kVA transformer to supply a load of 330 kVA. The transformers are rated 7200 V/240 V, but the 100 kVA unit has an impedance of 4 percent while the 250 kVA transformer has an impedance of 6 percent (Fig. 36a).
Calculate
a. The nominal primary current of each transformer
b. The impedance of the load referred to the primary side
c. The impedance of each transformer referred to the primary side
d. The actual primary current in each transformer