Question
A 20 kVA single phase transformer 4800/480V has primary resistance and reactance of 5Ω and 15Ω...
A 20 kVA single phase transformer 4800/480V has primary resistance and reactance of 5Ω and 15Ω respectively, while the resistance and reactance of secondary winding is 0.1Ω and 0.15 Ω respectively. Calculate:
(i) The parameter referred to primary side of transformer and draw the equivalent circuit
(ii) The approximate value of secondary voltage at full load power factor of 0.8 lagging if 4.8kV primary supply
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