The following data refer to a 1-phase Transformer : Turn ratio 19.5 : 1 ; R1 = 25Ω ; X1 = 100 Ω ; R2 = 0.06 Ω ; X2 = 0.25 Ω . No-load current = 1.25 A leading the flux by 30°. The secondary delivers 200 A at a terminal voltage of 500 V and p.f. of 0.8 lagging. Determine by the aid of a vector diagram, the primary applied voltage, the primary p.f. and the efficiency.
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