A 15-kW, 250-V, 1150 r/min shunt generator is driven by a prime mover whose speed is 1195
Question:
A 15-kW, 250-V, 1150 r/min shunt generator is driven by a prime mover whose speed is 1195 r/min when the generator delivers no load. The speed falls to 1140 r/min when the generator delivers 15 kW and may be assumed to decrease in proportion to the generator output. The generator is to be changed into a short-shunt compound generator by equipping it with a series field winding which will cause its voltage to rise from 230 V at no load to 250 V for a load of 61.5 A. It is estimated that the series field winding will have a resistance of 0.065?. The armature resistance (including brushes) is 0.175?. The shunt field winding has 500 turns per pole. To determine the necessary series-field turns, the machine is run as a separately-excited generator and the following load data are obtained: Armature terminal voltage = 254 V. Armature current = 62.7 A. Field current = 1.95 A Speed = 1140 r/min. The magnetization curve at 1195 r/min is as follows. Determine
a. The armature reaction in equivalent demagnetizing ampere-turns per pole for Ia = 62.7 A and
b. The necessary number of series-field turns per pole.
Transcribed Image Text:
240 250 270 230 260 280 E, V 1.65 1.91 1.05 1.25 1.44 1.13 I, A
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part a From the load data the generated voltage is equal to 254 627 x 0175 265 A From the magnetizin...View the full answer
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