A 25-MVA, 11.5 kV synchronous machine is operating as a synchronouscondenser, as discussed in Appendix D (section D.4.1). The generatorshort-circuit ratio is 1.68 and the field current at rated voltage, no load is420 A. Assume the generator to be connected directly to an 11.5 kV sourca. What is the saturated synchronous reactance of the generator in per unitand in ohms per phase?The generator field current is adjusted to 150 A.b. Draw a phasor diagram, indicating the terminal voltage, internal voltage,15urce.and armature current.c. Calculate the armature current magnitude (per unit and amperes) and itsrelative phase angle with respect to the terminal voltage.d. Under these conditions, does the synchronous condenser appear inductiveor capacitive to the 11.5 kV system?e. Repeat parts (b) through (d) for a field current of 700 A.

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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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Concept explainers

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.

Question

A 25-MVA, 11.5 kV synchronous machine is operating as a synchronous
condenser, as discussed in Appendix D (section D.4.1). The generator
short-circuit ratio is 1.68 and the field current at rated voltage, no load is
420 A. Assume the generator to be connected directly to an 11.5 kV sourc
a. What is the saturated synchronous reactance of the generator in per unit
and in ohms per phase?
The generator field current is adjusted to 150 A.
b. Draw a phasor diagram, indicating the terminal voltage, internal voltage,
15
urce.
and armature current.
c. Calculate the armature current magnitude (per unit and amperes) and its
relative phase angle with respect to the terminal voltage.
d. Under these conditions, does the synchronous condenser appear inductive
or capacitive to the 11.5 kV system?
e. Repeat parts (b) through (d) for a field current of 700 A.

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