Example 3 A 100kVA transformer has 400 turns on the primary and 80 turns on the secondary. The primary and secondary resistance are 0.3 ohm and 0.01 ohm respectively and the corresponding leakage reactances are 1.1 ohm and 0.035 ohm respectively. The supply voltage is 2200V. Calculate: ➤ the equivalent impedance referred to the primary circuit ➤the equivalent impedance referred to the secondary circuit