A salient-pole generator without dampers is rated 20 MVA, 13.8 KV and has a direct-axis subtransient reactance of .25 per unit. The negative- and zero-sequence reactances are, respectively, 0.35 and 0.10 per unit. The neutral of the generator is solidly grounded. With the generator operating unloaded at rated voltage with E = 120" per unit, a single linc-ta-ground fault occurs the machine terminals, which then have the following per unit voltages to ground: an V=0 : V= 1.0132-102.25 ; V= 1.013L102.25° Now, For subtransient conditions due the fault: V The zero sequence voltage in p.u is: Answer Next page

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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.