ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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Textbook Question
Chapter 2.2, Problem 4RQ
Conductors offer _________ resistance to current flow.
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Please write all the formulas clearly for
each case first, then solve the question
by hand on paper and send a clear
photo of the solution. Thanks a lot
6 A three-phase transistor voltage-source inverter supplies a three-phase load,
as shown in Fig.8.41. The load consists of star connected resistance of
10 in each phase. The inverter supply voltage is 200V d.c. and each
inverter switch conducts for 120°.
(a) Sketch the switching signals for the six transistors.
(b) Sketch the line-to-neutral voltage for one complete cycle of the
output voltage.
(c) Sketch the line-to-line voltage for one complete cycle of the
output voltage.
(d) Calculate the rms values of the first five harmonics in the line-
to-line output voltage, including the fundamental.
(e) Calculate the rms values of the first five harmonics in the line-
to-neutral output voltage, including the fundamental.
[Ans: (d) VL-L=244.95 V, (e) Vph = 141.42 V]
Q1
Q3
Q5
Vdc
200V
b
Q4
Q6
Q2
Fig.8.41.
120°
conuction
ww
102
w
1052
ww
n
1052
Please write all the
Formulas clearly for each case first,
then solve the question by hand on
paper and send a clear photo of the
solution. Thanks a lot
Tent waveforms if the
Q4) A three-phase inverter supplies a 3-phase load, as shown in Fig (2). The load consists of star
connected resistance of 1002 in each phase. The inverter supply voltage is 200 V dc, and each
inverter switch conducts 180°.
(a) Sketch the switching signals for the six transistors.
(b) Sketch the line-line voltage for one complete cycle of the output voltage
(c) Sketch the line-line voltage for one complete cycle of the output voltage
(d) Calculate the rms values of the first five harmonics in the line-line output voltage,
including the fundamental.
(e) Calculate the rms values of the first five harmonics in the line-neutral output voltage.
including the fundamental.)
Vac
200V
Q1
Q3
Q5
B
Q6
b
Q2
ww
10Ω
Fig2
3
1092
ww
1092
Please write all the formulas clearly for
each case first, then solve the question
by hand on paper and send a clear
photo of the solution. Thanks a lot
A three-phase bridge-inverter is fed from a d.c. source of 200 V. If the
load is star-connected of 10 02/phase pure resistance, determine the RMS
load current, the required RMS current rating of the thyristors and the load
power for (i) 120° firing, and (ii) 180° firing.
[Ans (i) 120° firing IL (rms) = 8.16 A, IT(rms) = 9.8 A. Load power = 2000 W.
(ii) 180° firing IL (rms) = 9.43 A, IT (rms) = 6.67 A. Load power = 2667 W.]
Chapter 2 Solutions
ELECTRICITY FOR TRADES
Ch. 2.1 - What three particles can be found within an atom?Ch. 2.1 - Which particle has a negative charge and rotates...Ch. 2.1 - Which particle of an atom has a positive charge?Ch. 2.1 - Compare the size and mass (weight) of the electron...Ch. 2.1 - Prob. 5RQCh. 2.1 - Normally every atom contains an ___________ number...Ch. 2.1 - Prob. 7RQCh. 2.1 - Prob. 8RQCh. 2.1 - Prob. 9RQCh. 2.1 - Prob. 10RQ
Ch. 2.2 - _________ electrons are found in the outermost...Ch. 2.2 - Whenever a valence electron is removed from its...Ch. 2.2 - Prob. 3RQCh. 2.2 - Conductors offer _________ resistance to current...Ch. 2.2 - Conductors have incomplete valence shell of...Ch. 2.2 - Insulators have few, if any, _______ electrons.Ch. 2.2 - Semiconductors have some of the characteristics of...Ch. 2.2 - Two examples of pure semiconductor materials are...Ch. 2.2 - Explain the main characteristic of a semiconductor...Ch. 2.2 - What is voltage similar to?Ch. 2.2 - Electric current refers to the flow of _________...Ch. 2.2 - Compare the resistance of a conductor with that of...Ch. 2.2 - What does the circuit of a simple battery-operated...Ch. 2.2 - Prob. 14RQ
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