Q3-(A)- Three single-phase, 50 kVA, 2310/ 230 V, 60 a 3-phase, star /delta, 4000/230V transformer bank. The equivalent resistance of transformer referred to low-voltage is 0.012 and the equivalent reactance of each transformer referred to low-voltage is 0.016 W. The 3-phase transformer supplies a 3-phase, 120 kW, 230 V, 0.85 power-factor (lagging) load. (i) Draw a schematic diagram showing the transformer connection. (ii) Determine the winding currents of the transformer.

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Q3-(A)- Three single-phase, 50 kVA, 2310/230 V, 60 Hz transformers are connected to form
a 3-phase, star /delta, 4000/230V transformer bank. The equivalent resistance of e
transformer referred to low-voltage is 0.012 and the equivalent reactance of each
transformer referred to low-voltage is 0.016 W. The 3-phase transformer
supplies a 3-phase, 120 kW, 230 V, 0.85 power-factor (lagging) load.
(i) Draw a schematic diagram showing the transformer connection.
(ii) Determine the winding currents of the transformer.
(B)- Draw the graph of efficiency against load current when the transformer is loaded
Transcribed Image Text:Q3-(A)- Three single-phase, 50 kVA, 2310/230 V, 60 Hz transformers are connected to form a 3-phase, star /delta, 4000/230V transformer bank. The equivalent resistance of e transformer referred to low-voltage is 0.012 and the equivalent reactance of each transformer referred to low-voltage is 0.016 W. The 3-phase transformer supplies a 3-phase, 120 kW, 230 V, 0.85 power-factor (lagging) load. (i) Draw a schematic diagram showing the transformer connection. (ii) Determine the winding currents of the transformer. (B)- Draw the graph of efficiency against load current when the transformer is loaded
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