A 1500 kvA, 3Φ star-connected alternator, 50 Hz,2300 V alternator has a resistance between each pair of terminals as measured by direct currents is 0.16 ohm. Assume that the effective resistance is 1.5 times the ohmic value. A field current of 70 A produces a short-circuit current equal to full load current of 376 A in each line. The same field current produces an emf of 700 V on open circuit. Determine the synchronous reactance of the machine and its full load voltage regulation at 0.8 power factor lagging. [Ans. VR = 22.8 %]
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