3-6. A 15-kVA 8000/230-V distribution transformer has an impedance referred to the primary of 80 + j300 Ω. The components of the excitation branch referred to the primary side are RC = 350 kΩ and XM = 70 kΩ.
(a) If the primary voltage is 7967 V and the load impedance is ZL = 3.2 + j1.5 Ω, what is the secondary voltage of the transformer? What is the voltage regulation of the transformer?
(b) If the load is disconnected and a capacitor of −j3.5 Ω is connected in its place, what is the secondary voltage of the transformer? What is its voltage regulation under these conditions?
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