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Question
Q8. A. Why is it important to maintain high efficiency of operation and low values of voltage regulation for power transformers? (6)
B. A 100 KVA transformer has 400 turns on the primary and 80 turns on the secondary. The primary and secondary resistances are 0.3 𝛀 and 0.01 𝛀 respectively, and the corresponding leakage reactances are 1.1 𝛀 and 0.035 𝛀 respectively. The supply voltage is 2200 V. Calculate:
(i) The equivalent impedance referred to the primary circuit.
(ii) The voltage regulation and secondary terminal voltage for full load having a power factor of (a) 0.8 lagging and (b) 0.8 leading. (10)
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