A 2300 V, 1000 hp, fp = 0.8 (+), 60 Hz, two-pole, Y-connected three-phase synchronous motor has a Synchronous reactance of 4 and negligible armature resistance. its friction losses of bearings and wind are 30 kW and their core losses are 20 kW. The field circuit has a 200 V DC power supply and supports a maximum current of 10 A. The open circuit characteristic of this motor is shown in the figure. The motor is supposed to be powered by an infinite busbar. Decide: a. The field current required for the motor to deliver the specified load at a power factor of the unit. b. The armature current, its new power factor and the reactive power consumed/delivered by the motor, if the field current is increased by 10%. c. Determine the curves V, ( Ia vs If.), of the motor when it operates without load, at half its nominal load and at full load.
A 2300 V, 1000 hp, fp = 0.8 (+), 60 Hz, two-pole, Y-connected three-phase synchronous motor has a Synchronous reactance of 4 and negligible armature resistance. its friction losses of bearings and wind are 30 kW and their core losses are 20 kW. The field circuit has a 200 V DC power supply and supports a maximum current of 10 A. The open circuit characteristic of this motor is shown in the figure. The motor is supposed to be powered by an infinite busbar. Decide: a. The field current required for the motor to deliver the specified load at a power factor of the unit. b. The armature current, its new power factor and the reactive power consumed/delivered by the motor, if the field current is increased by 10%. c. Determine the curves V, ( Ia vs If.), of the motor when it operates without load, at half its nominal load and at full load.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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A 2300 V, 1000 hp, fp = 0.8 (+), 60 Hz, two-pole, Y-connected three-phase synchronous motor has a Synchronous reactance of 4 and negligible armature resistance. its friction losses of bearings and wind are 30 kW and their core losses are 20 kW. The field circuit has a 200 V DC power supply and supports a maximum current of 10 A. The open circuit characteristic of this motor is shown in the figure.
The motor is supposed to be powered by an infinite busbar. Decide:
a. The field current required for the motor to deliver the specified load at a power factor of the unit.
b. The armature current, its new power factor and the reactive power consumed/delivered by the motor, if the field current is increased by 10%.
c. Determine the curves V, ( Ia vs If.), of the motor when it operates without load, at half its nominal load and at full load.
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