A three-phase, 1200 HP, 2300 V, 60 Hz, synchronous machine has R. =022 When operated with the mechanical load disconnected with rated voltage and frequency, the field current is adjusted until line current has a minimum value. At this point,= 22.1 A the measured input power is =17.5 KW, and the measured field circuit values are =276 V and = 53.2 A (a) Determine the rotational losses (core losses plus friction and windage) for this machine. (b) If the field current, frequency, and impressed terminal voltage are unchanged, but a mechanical load 600H.P is attached to the machine which changed the amature current la =130.07A Determine the machine efficiency.
A three-phase, 1200 HP, 2300 V, 60 Hz, synchronous machine has R. =022 When operated with the mechanical load disconnected with rated voltage and frequency, the field current is adjusted until line current has a minimum value. At this point,= 22.1 A the measured input power is =17.5 KW, and the measured field circuit values are =276 V and = 53.2 A (a) Determine the rotational losses (core losses plus friction and windage) for this machine. (b) If the field current, frequency, and impressed terminal voltage are unchanged, but a mechanical load 600H.P is attached to the machine which changed the amature current la =130.07A Determine the machine efficiency.
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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![Determine the generated EMF through the phasor diagram and Saturated equivalent circuit
parameters (armature resistance and synchronous reactance).
A three-phase, 1200 HP, 2300 V, 60 Hz, synchronous machine has R = 0.2 2 When
operated with the mechanical load disconnected with rated voltage and frequency, the field
current is adjusted until line current has a minimum value. At this point, a = 22.1 A the
measured input power is r =17.5 kW, and the measured field circuit values are '=276 V
and = 53.2 A
(a) Determine the rotational losses (core losses plus friction and windage) for this machine.
(b) If the field current, frequency, and impressed terminal voltage are unchanged, but a
mechanical load 600H.P is attached to the machine which changed the armature current la
=130.07A Determine the machine efficiency.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fab959af2-fa55-4321-b624-38736f5a8982%2F829c16c5-57e9-4197-9823-6343675a52b8%2Fnbjxoeq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Determine the generated EMF through the phasor diagram and Saturated equivalent circuit
parameters (armature resistance and synchronous reactance).
A three-phase, 1200 HP, 2300 V, 60 Hz, synchronous machine has R = 0.2 2 When
operated with the mechanical load disconnected with rated voltage and frequency, the field
current is adjusted until line current has a minimum value. At this point, a = 22.1 A the
measured input power is r =17.5 kW, and the measured field circuit values are '=276 V
and = 53.2 A
(a) Determine the rotational losses (core losses plus friction and windage) for this machine.
(b) If the field current, frequency, and impressed terminal voltage are unchanged, but a
mechanical load 600H.P is attached to the machine which changed the armature current la
=130.07A Determine the machine efficiency.
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