For a 20 kVA, 250 V, 6 pole, 3-phase, Y-connected alternator has an AC armature resistance between terminals of 0.16-ohm, leakage reactance of 0.3 ohms per phase. Field resistance 75°C is 14.3 ohms, If 3A; friction and windage loss = 350 Watts; core loss =180 Watts. = Calculate: a) %n at 80% of the load, 0.8 pf lagging b) maximum efficiency at 0.8 pf lagging
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.
Kindly answer the what is asked wherein the %n at full load, 0.8 lagging is 90.48%, Solve for the %n at 80% of the load and the nmax of it with 0.8pf lagging. Moreover, show me a complete, clean, step by step solution so that I can understand.
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