A three-phase star-connected alternator working at 1400 KVA,50 Hz,2200 V, has an armature dc resistance of 0.18 Ω. Assume the ac resistance is 1.3 times the dc resistance. A field current of 65 A produces a short circuit current of 360 A and for the same field current the open circuit voltage is 1200 V. Determine a} Synchronous reactance of the machine b) Full load regulation at 0.9 lagging c) Power angle
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.
A three-phase star-connected alternator working at 1400 KVA,50 Hz,2200 V, has an armature dc resistance of 0.18 Ω. Assume the ac resistance is 1.3 times the dc resistance. A field current of 65 A produces a short circuit current of 360 A and for the same field current the open circuit voltage is 1200 V. Determine
a} Synchronous reactance of the machine
b) Full load regulation at 0.9 lagging
c) Power angle
Step by step
Solved in 2 steps with 3 images
