Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Textbook Question
Chapter 4, Problem 14SQ
When reading a schematic diagram, are the control components shown as they should be when the machine is turned off or de-energized, or are they shown as they should be when the machine is in operation?
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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 4 Solutions
Electric Motor Control
Ch. 4 - Identify the following symbols.Ch. 4 - Electrical symbols usually conform to which...Ch. 4 - What do the following abbreviations stand for? a....Ch. 4 - Single-pole and double-pole switch symbols are...Ch. 4 - The symbol shown is a a. polarized capacitor. b....Ch. 4 - The symbol shown is a a. normally closed float...Ch. 4 - The symbol shown is a(n) a. iron core transformer....Ch. 4 - The symbol shown is a a. normally open pressure...Ch. 4 - The symbol shown is a a. double-acting push...Ch. 4 - If you were installing the circuit in Figure 412,...
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