Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 27, Problem 3SQ
Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 27–3.
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A generator delivers power through a transmission line to a star-connected load. The system is
balanced. Find the values of the currents involved in per unit, considering: (a) single-phase
bases and (b) three-phase bases.
Datos:
S₁ = 2 MVA
Vg
= 13.2 kV
Generador
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Linea
Demanda
Pg+jQg
Uga
ZLT a
Zlinea 8.68+j3.162
Zcarga = 70+/10
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ZDa
ZD b
ZD€
Bases trifásicas:
Ug b
ZLT b
Sb36 = 2 MVA
Vb34 = 13.820° kV
Ugo
ZLTC
control system
control system
Chapter 27 Solutions
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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