The following data for a 1250 kVA, 0.8 p.f., 50 Hz, 3300 V, 300 rpm star connected alternator is available : Stator turns per phase = 150 = 60 Field turns per pole Effective area per pole = 0.09 m² Airgap length at pole centre = 5.5 mm Field current for full load short circuit current = 80 A = 20% of airgap ATS per pole for iron portion Assuming sinusoidal flux distribution, estimate the values of short circuit ratio and synchronous reactance.

Q: A single-phase AC voltage controller has a resistive load R = 10 Ohm, and %3D the RMS input voltage…

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Q: In a three-phase star connected alternator it is necessary to generate 7200 line voltage at…

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Q: v. With reference to an 50 Hz3 phase alternator explain how P,Q,V and F are controlled.

A: It is asked to explain the control of P (active power),Q (reactive power), V (voltage) and F…

Q: Calculate the pitch factor for an alternator winding with 36 slots, 4 poles, and coil span of 1 to…

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Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.