Fundamentals of Electric Circuits
6th Edition
ISBN: 9780078028229
Author: Charles K Alexander, Matthew Sadiku
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 12, Problem 6P
Using Fig. 12.41, design a problem to help other students better understand balanced wye-wye connected circuits.
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there is a three-phase transformer that supplies 12 kW to a neighborhood supermarket, the same is in the standards and is considered a balanced three-phase load with inductive power factor of 0.8. If the supermarket at the supply input is star connected, fed with four conductors and operating at a phase-neutral voltage equal to 200 V. What is the line current with this load?
Q-3-)
a
V346.41 V
b
Z=0+339
Z=0+j3Q
Z=0+/39
m
Line
V₂
R
R
R=1252
Star-Connected load
R
b-) Find the voltage drop value in the energy distribution line.
c-) Find the voltage V₂ at the load ends at the end of the line.
R
B
R
R=1892
Delta-Connected load
In the figure above, two balanced 3-phase delta and star-connected loads are connected in parallel to a
balanced three-phase power distribution line. Delta and star connected loads are completely resistive and
the resistance values per phase are 18 2 and 12 22, respectively. The phase-to-phase voltage value of the
source feeding the line is 346.41 V (rms), and it is assumed that the three-phase network between the source
and the load has an inductive reactance value of 3j 2 per phase.
a-) Find the total current drawn from the source, active and reactive power values by selecting the
Van voltage as a reference value.
A three-phase feeder provides two loads A and B at 380 V (Figure 2). considering the impedance of load A of (55 + j89) ohms and that of load B of (90 + j66) ohms. indicated as currents in phases A that feed the two loads and currents in the delta connected load.
Chapter 12 Solutions
Fundamentals of Electric Circuits
Ch. 12.2 - Given that Vbn=22030V, find Van and Vcn, assuming...Ch. 12.3 - A Y-connected balanced three-phase generator with...Ch. 12.4 - One line voltage of a balanced Y-connected source...Ch. 12.5 - A positive-sequence, balanced -connected source...Ch. 12.6 - In a balanced -Y circuit, Vab=44015 and ZY = (12 +...Ch. 12.7 - For the Y-Y circuit in Practice Prob. 12.2,...Ch. 12.7 - Calculate the line current required for a 30-kW...Ch. 12.7 - Assume that the two balanced loads in Fig....Ch. 12.8 - The unbalanced -load of Fig. 12.24 is supplied by...Ch. 12.8 - Find the line currents in the unbalanced...
Ch. 12.9 - Prob. 11PPCh. 12.9 - For the unbalanced circuit in Fig. 12.32, use...Ch. 12.10 - Repeat Example 12.13 for the network in Fig. 12.24...Ch. 12.10 - Let the line voltage VL = 208 V and the wattmeter...Ch. 12.10 - If the load in Fig. 12.35 is delta-connected with...Ch. 12 - What is the phase sequence of a three-phase motor...Ch. 12 - If in an acb phase sequence, , then Vcn is:Ch. 12 - Which of these is not a required condition for a...Ch. 12 - Prob. 4RQCh. 12 - Prob. 5RQCh. 12 - In a Y-Y system, a line voltage of 220 V produces...Ch. 12 - In a - system, a phase voltage of 100 V produces a...Ch. 12 - When a Y-connected load is supplied by voltages in...Ch. 12 - Prob. 9RQCh. 12 - Prob. 10RQCh. 12 - If Vab = 400 V in a balanced Y-connected...Ch. 12 - What is the phase sequence of a balanced...Ch. 12 - Given a balanced Y-connected three-phase generator...Ch. 12 - A three-phase system with abc sequence and VL =...Ch. 12 - For a Y-connected load, the time-domain...Ch. 12 - Using Fig. 12.41, design a problem to help other...Ch. 12 - Obtain the line currents in the three-phase...Ch. 12 - In a balanced three-phase Y-Y system, the source...Ch. 12 - A balanced Y-Y four-wire system has phase voltages...Ch. 12 - For the circuit in Fig. 12.43, determine the...Ch. 12 - In the Y- system shown in Fig. 12.44, the source...Ch. 12 - Using Fig. 12.45, design a problem to help other...Ch. 12 - In the balanced three-phase Y- system in Fig....Ch. 12 - Obtain the line currents in the three-phase...Ch. 12 - The circuit in Fig. 12.48 is excited by a balanced...Ch. 12 - A balanced delta-connected load has a phase...Ch. 12 - A positive sequence wye-connected source where ,...Ch. 12 - If Van = 22060 V in the network of Fig. 12.49,...Ch. 12 - For the - circuit of Fig. 12.50, calculate the...Ch. 12 - Prob. 20PCh. 12 - Three 440-V generators form a delta-connected...Ch. 12 - Find the line currents IaA, IbB, and IcC in the...Ch. 12 - A balanced delta connected source is connected to...Ch. 12 - A balanced delta-connected source has phase...Ch. 12 - In the circuit of Fig. 12.54, if , , , find the...Ch. 12 - Using Fig. 12.55, design a problem to help other...Ch. 12 - A -connected source supplies power to a...Ch. 12 - The line-to-line voltages in a Y-load have a...Ch. 12 - A balanced three-phase Y- system has V rms and Z =...Ch. 12 - In Fig. 12.56, the rms value of the line voltage...Ch. 12 - A balanced delta-connected load is supplied by a...Ch. 12 - Design a problem to help other students better...Ch. 12 - A three-phase source delivers 4.8 kVA to a...Ch. 12 - A balanced wye-connected load with a phase...Ch. 12 - Three equal impedances, 60 + j30 each, are...Ch. 12 - A 4200-V, three-phase transmission line has an...Ch. 12 - The total power measured in a three-phase system...Ch. 12 - Given the circuit in Fig. 12.57 below, find the...Ch. 12 - Find the real power absorbed by the load in Fig....Ch. 12 - For the three-phase circuit in Fig. 12.59, find...Ch. 12 - A balanced delta-connected load draws 5 kW at a...Ch. 12 - A balanced three-phase generator delivers 7.2 kW...Ch. 12 - Refer to Fig. 12.48. Obtain the complex power...Ch. 12 - A three-phase line has an impedance of 1 + j3 per...Ch. 12 - A balanced wye-connected load is connected to the...Ch. 12 - A three-phase load consists of three 100-...Ch. 12 - The following three parallel-connected three-phase...Ch. 12 - A balanced, positive-sequence wye-connected source...Ch. 12 - Each phase load consists of a 20- resistor and a...Ch. 12 - A balanced three-phase source with VL = 240 V rms...Ch. 12 - Consider the wye-delta system shown in Fig. 12.60....Ch. 12 - A four-wire wye-wye circuit has...Ch. 12 - Using Fig. 12.61, design a problem that will help...Ch. 12 - A balanced three-phase Y-source with VP = 880 V...Ch. 12 - A three-phase supply, with the line-to-line...Ch. 12 - Using Fig. 12.63, design a problem to help other...Ch. 12 - Determine the line currents for the three-phase...Ch. 12 - Solve Prob. 12.10 using PSpice or MultiSim. For...Ch. 12 - The source in Fig. 12.65 is balanced and exhibits...Ch. 12 - Use PSpice or MultiSim to determine Io in the...Ch. 12 - Given the circuit in Fig. 12.67, use PSpice or...Ch. 12 - Using Fig. 12.68, design a problem to help other...Ch. 12 - Use PSpice or MultiSim to find currents IaA and...Ch. 12 - For the circuit in Fig. 12.58, use PSpice or...Ch. 12 - A balanced three-phase circuit is shown in Fig....Ch. 12 - A three-phase, four-wire system operating with a...Ch. 12 - As shown in Fig. 12.72, a three-phase four-wire...Ch. 12 - Meter readings for a three-phase wye-connected...Ch. 12 - A certain store contains three balanced...Ch. 12 - The two-wattmeter method gives P1=1200W and...Ch. 12 - In Fig. 12.73, two wattmeters are properly...Ch. 12 - If wattmeters W1 and W2 are properly connected...Ch. 12 - For the circuit displayed in Fig. 12.74, find the...Ch. 12 - Predict the wattmeter readings for the circuit in...Ch. 12 - Prob. 75PCh. 12 - Show that the I2R losses will be higher for a...Ch. 12 - A three-phase generator supplied 10 kVA at a power...Ch. 12 - Prob. 78CPCh. 12 - A balanced three-phase generator has an abc phase...Ch. 12 - A balanced three-phase source furnishes power to...Ch. 12 - A professional center is supplied by a balanced...Ch. 12 - A balanced three-phase system has a distribution...Ch. 12 - A commercially available three-phase inductive...Ch. 12 - Figure 12.76 displays a three-phase...Ch. 12 - Design a three-phase heater with suitable...Ch. 12 - For the single-phase three-wire system in Fig....Ch. 12 - Consider the single-phase three-wire system shown...
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- A three-phase feeder supplies two loads A and B at 380 V (Figure 2).Find the impedance of load A of (55 + j89) ohms and that of load B of(90 + j66) ohms. Ordered as currents in phases A that feed the twoloads, and as currents in the delta connected load.arrow_forwardAnswer all 1.) In a three phase Delta-Wye connection a.) What is the relationship between the line to line voltage at the source and the load? b.) What is the relationship between the Phase to Phase voltage at the load and source? c.) What is the relationship between the line Currents and phase currents going into the load? d.) What is the relationship between the power being dissipated as seen from the source compared to the load?arrow_forwardA balanced -connected impedance load with (12+j9) per phase is supplied by a balanced three-phase 60-Hz,208-V source, (a) Calculate the line current, the total real and reactive power absorbed by the load, the load power factor, and the apparent load power, (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the -load currents. Use Vab as the reference.arrow_forward
- Two balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at 0.9 power factor leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. (a) Determine the source current. (b) If the load neutrals are connected to the source neutral by a zero-ohm neutral wire through an ammeter, what will the ammeter read?arrow_forwardQuestion: Need Help! 1. In A Wye-Connected Circuit, If The Line-To-Line Voltage Is 346 V, What Is The Line-To-Neutral Voltage? (2) 2. In A Delta... Need help! 1. In a wye-connected circuit, if the line-to-line voltage is 346 V, what is the line-to-neutral voltage? (2) 2. In a delta-connected circuit, the current is 20 A in each resistance load. What is the line current? (2) 3. In a wye-connected circuit, the current is 10 A in each resistance load. What is the line current? (2) 4. Three loads, each having a resistance of 10 0, are connected in wye. The total three-phase power is 3000 W. What is the line-to-line voltage? (2) 5. Three resistors each having a resistance of 11 N are connected in delta across a three-phase 440 V line. (4) a. What is the line current? b. What is the total three-phase power?arrow_forward10-KVA, 2400/240 V, single-phase transformer has a secondary equivalent impedance of (0.06 + 10.30) ohms. Find the primary voltage required to produce 240 V at the secondary terminals at full load, 0.8 pf leading. A. 2356 VB. 2348 V C. 2372 V D. 2364 Varrow_forward
- c) Drive the expression for maximum phase leads of m given network V. in R₁ min C₁ wwww R2arrow_forwardPlease answer quickly "In series-connected ac circuit, the total voltage across the circuit is always equal to the sum of the magnitude (only) of the individual voltage across each element." True False The power factor is equal to cosine of the phase difference. True False A leading power factor means that the circuit is predominantly capacitive in nature. True False "Since most loads are resistive in nature (e.g. motors), improvement of power factor is done by connecting capacitor banks or a synchronous condenser " True Falsearrow_forwardThe unbalanced delta load in the figure below is supplied by balanced voltages of 200 V in the positive sequence. Find the line currents. Take Vab as reference.arrow_forward
- V:.. H.W. .mp4 www.DANDICAMCO 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- 120/150arrow_forwardAsiacell|ASIACELL 3G 2G zain 1Q BartlebySolutions.. Q3: At the parallel operation of three-phase transformers: a) Give an explanation for the following cases: i. Two-lamps are glow-up i. Three-lamps are glow-up إضافة وصف. . .arrow_forwardExample: A balanced positive-sequence wye-connected 60 Hz three-phase source has line-to- line voltages of V,=1000 V. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.2 H inductance in series with a 100 0 resistance. Find the line-to-neutral voltages, the line currents, the power, and the reactive power delivered to the load. Assume that the phase of Van is zero.arrow_forward
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