Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
9th Edition
ISBN: 9781259989452
Author: Hayt
Publisher: Mcgraw Hill Publishers
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Chapter 12, Problem 33E
Repeat Exercise 32 if Rw = 1 Ω. Verify your solution using an appropriate simulation. 
■ FIGURE 12.35
The balanced Δ-connected load in Fig. 12.35 is demanding 10 kVA at a lagging PF of 0.91. If line losses are negligible, calculate IbB and Van if Vca = 160∠30 ° V and the source voltages are described using positive phase sequence.
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A workshop from a 231/400 V transformer center with a 3-phase and four-conductor underground cablefed. The resistance of the phase conductors is 0.035 ohms and the resistance of the neutral conductors is 0.05 ohms.25 kVA at 0.8 reverse power factor from R phase of the supply line, 0.8 forward power factor from S phase 15Fully ohmic loads of 10 kVA are drawn from kVA and T phases.(a) Find the currents flowing through the phase conductors and neutral conductors.(b) Voltage drops between the transformer substation and the workshop and at the load terminals.calculate the voltages(c) Plot the supply line currents and phase voltages phasorally.
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.
V:..
H.W. .mp4
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H.W. 1 Poly-phase Systems
A three phase, four-wire, 208 volt, CBA system has a wyeconnected load with Z, = 60°,
2, = 6/30° and Ze = 5/45°. Obtain the three line currents and the neutral current(in a polar form)
after finding O2 and 03.
A'
120/03
1002
B-
120/150
Chapter 12 Solutions
Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
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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- A three-phase balanced Y-connected load with series impedances of (8+ j24) Q per phase and mutual impedance between any two phases of j4 Q is supplied by a three-phase unbalanced source with line-to-neutral voltages of Van = 200/25°, Von = 100/-155°, Ven = 80/100° V. The load and source neutrals are both solidly grounded. Determine: (a) the load sequence impedance matrix, (b) the symmetrical components of the line-to-neutral voltages, (c) the symmetrical components of the load currents, and (d) the load currents. %3Darrow_forwardTwo delta connected loads are connected in parallel and powered by a balanced Y-connectedsource. The smaller of two loads draws 10 kVA at a lagging power factor of 0.75 and the largerdraws 25 kVA at a leading power factor of 0.8. The line voltage is 400 V. Calculate a) The powerfactor at which the source is operating. b) The total power drawn by the two loads. c) The phasecurrent of each load.arrow_forwardProblem 2 For the system shown in Figure 12.5: a) Find Is. b) Find the average power delivered to each element. c) Find the reactive power associated with each element. d) Find PT, QT, and ST. e) Find the power factor seen by the source E. R₁ ww 392 + E = 50 V/60° R3 ww 492 R₂ 12 Ω Χ 16Ω Xc 802 Figure 12.5arrow_forward
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