EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Textbook Question
Chapter 27, Problem 2SQ
What is meant by an “open transition” from start to run? Why is this condition objectionable at times when used with large horsepower motors?
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PV
station
8.6 Consider the microgrid given in Figure 8.56.
The positive sequence impedance of the transmission lines is given in
the one-line diagram (Figure 8.56). The system data are as follows:
PV generating station: 2 MW, 460 V AC; positive, negative, and zero
sequence impedance of each line is equal to 10%. The gas turbine gen-
erating station is rated at 10 MVA, 3.2 kV, with positive sequence reac-
tance of 10%. The generator negative sequence impedance is equal to
the positive sequence, and the zero sequence impedance is equal to half
(1/2) of the positive sequence impedance. Transformers' positive
sequence impedance is equal to the negative sequence and equal to
the zero sequence impedance.
DC/AC
3
CB
T₁
AC PV bus YA
6
1+/10
20
CB
CB
CB
m
0.5+15
личи
5
A
S5
2
Gas
turbine
0.3+16
7 ww
NA
Local
S6
ST
utility
Figure 8.56 A one-line diagram for Problem 8.6.
Chapter 27 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 27 - Why is it desirable to remove the autotransformers...Ch. 27 - What is meant by an open transition from start to...Ch. 27 - Which of the following applies to an...Ch. 27 - How are reduced voltages obtained from...Ch. 27 - Prob. 5SQCh. 27 - What is a disadvantage of starting with...Ch. 27 - What is one advantage of using an autotransformer...
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