Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 37, Problem 4SQ
To determine
Choose the correct option that would not cause the following problem: when the tank is overflowing, the wound rotor motor has not started and the alarm has not sounded.
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B) A 60-Hz generator is supply ing 60% of P max to an infinite bus through a reactive network.
A fault occurs which increases the reactance of the network between the generator internal
voltage and the infinite bus by 400%. When the fault is cleared, the maximum power that can
be delivered is 80% of the original maximum value. Determine the critical clearing angle for
the condition described.
Q3)
A: A generator operating at 50 Hz delivers 1 pu power to an infinite bus through a transmission
circuit in which resistance is ignored. A fault takes place reducing the maximum powe transferable
to 0.5 pu whereas before the fault, this power was 2.0 pu and after the clearance of the fault, it is
1.5 pu. By the use of equal area criterion, determine the critical clearing angle.
4. For the periodic signal shown in Fig. 4;
a) Find the exponential Fourier Series for y(t).
b) Use Parseval's Theorem to compute the total power contained in the 4th harmonic and all higher
harmonics.
2+
y(t)
+
-2л
-л
0
2л
Зл
4л
Fig. 4
Chapter 37 Solutions
Electric Motor Control
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