A three-phase alternator, 2500KVA, and 2400 volts operate at rated kilovolt-Ampere at a power factor of 80%. At 70ºC the dc armature resistance between terminals is 0.0852. The current taken by the field winding is 70 Amperes at 130 volts from the exciter equipment. Friction and windage loss is 20KW, Iron loss is 40KW, and the stray power losses are 3KW. Assume that the effective armature winding resistance is 1.2

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A three-phase alternator, 2500KVA, and 2400 volts operate at rated
kilovolt-Ampere at a power factor of 80%. At 70°C the dc armature
resistance between terminals is 0.0852. The current taken by the field
winding is 70 Amperes at 130 volts from the exciter equipment. Friction
and windage loss is 20KW, Iron loss is 40KW, and the stray power losses
are 3KW. Assume that the effective armature winding resistance is 1.2
times the dc value. Calculate the efficiency of the alternator.
Transcribed Image Text:A three-phase alternator, 2500KVA, and 2400 volts operate at rated kilovolt-Ampere at a power factor of 80%. At 70°C the dc armature resistance between terminals is 0.0852. The current taken by the field winding is 70 Amperes at 130 volts from the exciter equipment. Friction and windage loss is 20KW, Iron loss is 40KW, and the stray power losses are 3KW. Assume that the effective armature winding resistance is 1.2 times the dc value. Calculate the efficiency of the alternator.
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