Three single-phase, 100kVA, 3300/240 V, 50 Hz transformers are connected to form a 3-phase 3300/415 V transformer bank. The equivalent impedance of each single-phase transformer referred to the high voltage side is (5 + j25) O. The 3-phase transformer is connected to a 3-phase source through 3-phase feeders, the impedance of each feeder per phase is (0.5 + j1.5) O. The transformer delivers full load at 415 V(line voltage) and 0.8 power factor lagging. i) Draw the schematic diagram showing the transformer connections. ii) Determine the transformer winding currents. iii) Derive the per phase equivalent circuit referred to the low voltage side and thus, iv) Determine the sendingend (primary) line voltage required for full load operation of the 3-phase transformer bank.; Three single-phase, 100kVA, 3300/240 V, 50 Hz transformers are connected to form a 3-phase 3300/415 V transformer bank. The equivalent impedance of each single-phase transformer referred to the high voltage side is (5 + j25) O. The 3-phase transformer is connected to a 3-phase source through 3-phase feeders, the impedance of each feeder per phase is (0.5 + j1.5) O. The transformer delivers full load at 415 V(line voltage) and 0.8 power factor lagging. i) Draw the schematic diagram showing the transformer connections. ii) Determine the transformer winding currents. iii) Derive the per phase equivalent circuit referred to the low voltage side and thus, iv) Determine the sendingend (primary) line voltage required for full load operation of the 3-phase transformer bank.
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