Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 16, Problem 1RQ
What conditions must be met before two alternators can be paralleled together?
Expert Solution & Answer
To determine
The conditions that must be met before two alternators can be paralleled together.
Explanation of Solution
The below figure represents two alternators connected in parallel arrangement.
The conditions that must be met before two alternators can be paralleled together are listed as follows.
- 1. The connection should be made to ensure that the phase rotation of all the machines is same.
- 2. The phases of the machine should be connected in sequence. The phase A of one machine is connected to the phase of A of another machine. Similarly, connect the phases B and C.
- 3. The alternator should have same output voltage.
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X 0 0.0133 0.033
y 0 0.01 0.0266
0.049 0.064 0.0747 0.0933 0.1053
0.0433 0.06 0.0733
0.111
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0.12
0.14
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B:
Find the numerical solution for the 2D equation below and calculate the temperature values for
each grid point shown in Fig. 2 (show all steps).
(Do only one trail using following initial values and show the final matrix)
[T1]
T₂
T3
[T] 1
=
[0]
0
0
d
dx
dx)
(ka)+4(ka)
=
dy
-20xy, k = 1 + 0.3 T
ge
L=3cm, 4x= Ay
B.Cs.:
at x=0=LT=0°C
at y=0-L T=10°C
Fig. (2)
: +0
العنوان
use only
Two rods fins) having same dimensions, one made orass (k = 85 Wm
K) and the mer of copper (k = 375 W/m K), having of their ends inserted
into a furna. At a section 10.5 cm a way from furnace, the temperature of
brass rod 120 Find the distance at which the ame temperature would be
reached in the per rod ? both ends are ex osed to the same environment.
ns
2.05
۲/۱
ostrar
Chapter 16 Solutions
Electrical Transformers and Rotating Machines
Ch. 16 - What conditions must be met before two alternators...Ch. 16 - How can the phase rotation of one alternator be...Ch. 16 - What is the function of the synchronizing lamps?Ch. 16 - What is a synchroscope?Ch. 16 - Assume that alternator A is supplying power to a...Ch. 16 - What two factors determine the output frequency of...Ch. 16 - At what speed must a six-pole alternator turn to...Ch. 16 - What three factors determine the output voltage of...Ch. 16 - What are slip rings used for on a rotating field...Ch. 16 - Is the rotor excitation current AC or DC?
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