Calculate a. The synchronous impedance Z, per phase b. The total resistance of the circuit, per phase c. The total reactance of the circuit, per
Calculate a. The synchronous impedance Z, per phase b. The total resistance of the circuit, per phase c. The total reactance of the circuit, per
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
Related questions
Question
Number 16 (letters a and b)
![11 State the of excitation
constant, the and
In 8, if the current is kept
SYNCHRONOUS GENERATORS
383
poling of large
Calculate
les covered here
put, efficiency,
to all machines.
sformers.
a. The synchronous impedance Z, per phase
b. The total resistance of the circuit, per
frequency if the speed is
a. 1000 r/min
b. 5 r/min
phase
c. The total reactance of the circuit, per
phase
d. The line current
Intermediate level
What is meant by the synchronous reac-
tance of a 3-phase generator? Draw the
e. The line-to-neutral voltage across the
load
asing a stationary
us generators?
nected in wye?
plain the meaning of all the parameters.
State the advantages of brushless excitation
systems over conventional systems. Using
a schematic circuit diagram, show how the
f. The line voltage across the load
g. The power of the turbine driving the
alternator
h. The phase angle between E, and the
voltage across the load
17 A3-phase generator rated 3000 KVA, 20 kV,
900 r/min, 60 Hz delivers power to a 2400
KVA, 16 kV load having a lagging power
factor of 0.8. If the synchronous reactance is
100 N, calculate the value of E per phase.
The generator in Fig. 2 has a synchronous
reactance of 0.4 2, per phase. It is con-
nected to an infinite bus having a line volt-
age of 14 kV, and the excitation voltage is
adjusted to 1.14 pu.
petween steam-
ent-pole genera-
rotor in Fig. 7 is excited.
12 Referring to Fig. 13, calculate the exciting
current needed to generate a no-load line
put, which of
voltage of
a. 24.2 kV
b. 12.1 kV
site, it is found
n at close to
oupled genera-
18
13 A3-phase generator possesses a synchro-
nous reactance of 6 N and the excitation
ency of 60 Hz,
voltage E, is 3 kV per phase (ref. Fig. 19).
Calculate the line-to-neutral voltage E for a
resistive load of 8N and draw the phasor
diagram.
a the rotor
ator produces a
2 kV. If a load
Calculate
a. The torque angle & when the generator
a. In Problem 13, draw the curve of E
versus I for the following resistive
loads: infinity, 24, 12, 6, 3, 0 ohms.
b. Calculate the active power P per phase
in each case.
ctor of 0.8 is
delivers 420 MW
b. The mechanical displacement angle a
c. The linear pole shift (measured along
the inside stator circumference)
must the excita-
ased in order to
Itage?
corresponding to this displacement
angle [in]
met before a gener-
c. Draw the curve of E versus P. For what
value of load resistance is the power
output a maximum?
3-phase system?
ples on the genera-
ormation given.
19 A test taken on the 500 MVA alternator of
Fig. 2 yields the following results:
1. Open-circuit line voltage is 15 kV for a
de exciting current of 1400 A.
2. Using the same de current, with the
armature short-circuited the resulting ac
" Refering to Fig. 2, calculate the length of
one pole-pitch measured along the internal
circumference of the stator.
poles on the air-
Fig. 11.
ing at 1200 r/min
ge of 9 kV, 60 Hz.
oltage be affected if
onnected to its
the following characteristics:
line current is 21 000 A.
E, = 2440 V
Calculate
X, = 144 0
R = 170
a. The base impedance of the generator,
per phase
b. The value of the synchronous reactance
impedance Z 175 N (resistive)
Dee
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Transcribed Image Text:11 State the of excitation
constant, the and
In 8, if the current is kept
SYNCHRONOUS GENERATORS
383
poling of large
Calculate
les covered here
put, efficiency,
to all machines.
sformers.
a. The synchronous impedance Z, per phase
b. The total resistance of the circuit, per
frequency if the speed is
a. 1000 r/min
b. 5 r/min
phase
c. The total reactance of the circuit, per
phase
d. The line current
Intermediate level
What is meant by the synchronous reac-
tance of a 3-phase generator? Draw the
e. The line-to-neutral voltage across the
load
asing a stationary
us generators?
nected in wye?
plain the meaning of all the parameters.
State the advantages of brushless excitation
systems over conventional systems. Using
a schematic circuit diagram, show how the
f. The line voltage across the load
g. The power of the turbine driving the
alternator
h. The phase angle between E, and the
voltage across the load
17 A3-phase generator rated 3000 KVA, 20 kV,
900 r/min, 60 Hz delivers power to a 2400
KVA, 16 kV load having a lagging power
factor of 0.8. If the synchronous reactance is
100 N, calculate the value of E per phase.
The generator in Fig. 2 has a synchronous
reactance of 0.4 2, per phase. It is con-
nected to an infinite bus having a line volt-
age of 14 kV, and the excitation voltage is
adjusted to 1.14 pu.
petween steam-
ent-pole genera-
rotor in Fig. 7 is excited.
12 Referring to Fig. 13, calculate the exciting
current needed to generate a no-load line
put, which of
voltage of
a. 24.2 kV
b. 12.1 kV
site, it is found
n at close to
oupled genera-
18
13 A3-phase generator possesses a synchro-
nous reactance of 6 N and the excitation
ency of 60 Hz,
voltage E, is 3 kV per phase (ref. Fig. 19).
Calculate the line-to-neutral voltage E for a
resistive load of 8N and draw the phasor
diagram.
a the rotor
ator produces a
2 kV. If a load
Calculate
a. The torque angle & when the generator
a. In Problem 13, draw the curve of E
versus I for the following resistive
loads: infinity, 24, 12, 6, 3, 0 ohms.
b. Calculate the active power P per phase
in each case.
ctor of 0.8 is
delivers 420 MW
b. The mechanical displacement angle a
c. The linear pole shift (measured along
the inside stator circumference)
must the excita-
ased in order to
Itage?
corresponding to this displacement
angle [in]
met before a gener-
c. Draw the curve of E versus P. For what
value of load resistance is the power
output a maximum?
3-phase system?
ples on the genera-
ormation given.
19 A test taken on the 500 MVA alternator of
Fig. 2 yields the following results:
1. Open-circuit line voltage is 15 kV for a
de exciting current of 1400 A.
2. Using the same de current, with the
armature short-circuited the resulting ac
" Refering to Fig. 2, calculate the length of
one pole-pitch measured along the internal
circumference of the stator.
poles on the air-
Fig. 11.
ing at 1200 r/min
ge of 9 kV, 60 Hz.
oltage be affected if
onnected to its
the following characteristics:
line current is 21 000 A.
E, = 2440 V
Calculate
X, = 144 0
R = 170
a. The base impedance of the generator,
per phase
b. The value of the synchronous reactance
impedance Z 175 N (resistive)
Dee
bum wod bo ri ovil
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