Engineering Circuit Analysis
9th Edition
ISBN: 9780073545516
Author: Hayt, William H. (william Hart), Jr, Kemmerly, Jack E. (jack Ellsworth), Durbin, Steven M.
Publisher: Mcgraw-hill Education,
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Chapter 12, Problem 20E
(a)
To determine
The line current and the per phase load impedance for the given condition.
(b)
To determine
The line current and the per phase load impedance for the given condition.
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A balanced three-phase system with a line voltage of 300 V is supplying a balanced Y-connected load with 1200 W at a leading PF of 0.8.
a) The magnitude of the line current is
A. Round off to two(2) decimal places, do not write units.
b) The per-phase load impedance is
Ohms. No decimal places, do not write units.
c) The angle of the impedance is
Degrees Round off to one(1) decimal place, do not write units
2.40 A balanced three-phase 240-V source supplies a balanced three-phase
load. If the line current I, is measured to be 15 A and is in phase with the
line-to-line voltage, Výc, find the per-phase load impedance if the load is
(a) Y-connected, (b) A-connected.
BC
A balanced three-phase Y-connected source
with positive sequance has an internal voltage
of 120 V/phase. The source feeds a balanced
three-phase Y-connected load having an
impedance of 39 + j28 N /phase. The
impedance of the transmission line connecting
the source to the load is 1+ j20/phase. The a-
phase of the source is the reference voltage.
a) Draw the equivalent per-phase-circuit for
the phase "a".
b) Calculate the three line currents in the
transmission lines.
c) Calculate the three phase voltages at load.
d) Calculate the three line-to-line voltages at
the terminals of the load.
e) Calculate the total average power in watts
delivered to the load.
f) Calculate the total complex power in VA
delivered by the source.
Chapter 12 Solutions
Engineering Circuit Analysis
Ch. 12.1 - Let and . Find (a) Vad; (b) Vbc; (c) Vcd.Ch. 12.2 - Prob. 2PCh. 12.2 - Modify Fig. 12.9 by adding a 1.5 resistance to...Ch. 12.3 - A balanced three-phase three-wire system has a...Ch. 12.3 - A balanced three-phase three-wire system has a...Ch. 12.3 - Three balanced Y-connected loads are installed on...Ch. 12.4 - Each phase of a balanced three-phase -connected...Ch. 12.4 - Prob. 8PCh. 12.5 - Determine the wattmeter reading in Fig. 12.24,...Ch. 12.5 - Prob. 10P
Ch. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 - Prob. 3ECh. 12 - Describe what is meant by a polyphase source,...Ch. 12 - Prob. 5ECh. 12 - Prob. 6ECh. 12 - Prob. 7ECh. 12 - Prob. 8ECh. 12 - Prob. 9ECh. 12 - Prob. 10ECh. 12 - The single-phase three-wire system of Fig. 12.31...Ch. 12 - Prob. 12ECh. 12 - Referring to the balanced load represented in Fig....Ch. 12 - Prob. 14ECh. 12 - Prob. 15ECh. 12 - Consider a simple positive phase sequence,...Ch. 12 - Assume the system shown in Fig. 12.34 is balanced,...Ch. 12 - Repeat Exercise 17 with Rw = 10 , and verify your...Ch. 12 - Prob. 19ECh. 12 - Prob. 20ECh. 12 - Prob. 21ECh. 12 - Prob. 22ECh. 12 - A three-phase system is constructed from a...Ch. 12 - Prob. 24ECh. 12 - Each load in the circuit of Fig. 12.34 is composed...Ch. 12 - Prob. 26ECh. 12 - Prob. 27ECh. 12 - A three-phase load is to be powered by a...Ch. 12 - For the two situations described in Exercise 28,...Ch. 12 - Prob. 30ECh. 12 - Prob. 31ECh. 12 - Prob. 32ECh. 12 - Repeat Exercise 32 if Rw = 1 . Verify your...Ch. 12 - Prob. 34ECh. 12 - Prob. 35ECh. 12 - Prob. 36ECh. 12 - A wattmeter is connected into the circuit of Fig....Ch. 12 - Find the reading of the wattmeter connected in the...Ch. 12 - (a) Find both wattmeter readings in Fig. 12.39 if...Ch. 12 - Circuit values for Fig. 12.40 are , , , , . Find...Ch. 12 - Prob. 41ECh. 12 - Prob. 42ECh. 12 - (a) Is the load represented in Fig. 12.41...Ch. 12 - Prob. 44E
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