Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 2.40P
A balanced three-phase 240-V source supplies a balanced three-phase Load. If the line current
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A balanced, positive-sequence, Y-connected voltage source with Eab = 480∠0o volts is applied to abalanced-∆ load with Z∆ = 30 ∠40o Ω. The line impedance between the source and load is ZL = 1 ∠850 Ω.for each phase. Calculate the line currents, the ∆ -load currents, and the voltages at the load terminals.Recall that ZY = Z∆/3
4-3. A balanced three-phase Y load has one phase voltage of ??? = 277 ∠ 450 V. If the phase sequence is ACB, find the line voltages VCA, VAB and VBC.
A balanced 3-phase, delta-connected load is connected across a balanced, 3-phase, positive phase sequence source. The load has (0 + j4) ohms per phase. If the voltage in line a to the neutral of this load is 120cis400, its line current
Chapter 2 Solutions
Power System Analysis and Design (MindTap Course List)
Ch. 2 - The rms value of v(t)=Vmaxcos(t+) is given by a....Ch. 2 - If the rms phasor of a voltage is given by V=12060...Ch. 2 - If a phasor representation of a current is given...Ch. 2 - Prob. 2.4MCQCh. 2 - Prob. 2.5MCQCh. 2 - Prob. 2.6MCQCh. 2 - Prob. 2.7MCQCh. 2 - Prob. 2.8MCQCh. 2 - Prob. 2.9MCQCh. 2 - The average value of a double-frequency sinusoid,...
Ch. 2 - The power factor for an inductive circuit (R-L...Ch. 2 - The power factor for a capacitive circuit (R-C...Ch. 2 - Prob. 2.13MCQCh. 2 - The instantaneous power absorbed by the load in a...Ch. 2 - Prob. 2.15MCQCh. 2 - With generator conyention, where the current...Ch. 2 - Consider the load convention that is used for the...Ch. 2 - Prob. 2.18MCQCh. 2 - The admittance of the impedance j12 is given by...Ch. 2 - Consider Figure 2.9 of the text, Let the nodal...Ch. 2 - The three-phase source line-to-neutral voltages...Ch. 2 - In a balanced three-phase Y-connected system with...Ch. 2 - In a balanced system, the phasor sum of the...Ch. 2 - Consider a three-phase Y-connected source feeding...Ch. 2 - For a balanced- load supplied by a balanced...Ch. 2 - A balanced -load can be converted to an...Ch. 2 - When working with balanced three-phase circuits,...Ch. 2 - The total instantaneous power delivered by a...Ch. 2 - The total instantaneous power absorbed by a...Ch. 2 - Under balanced operating conditions, consider the...Ch. 2 - One advantage of balanced three-phase systems over...Ch. 2 - While the instantaneous electric power delivered...Ch. 2 - Given the complex numbers A1=630 and A2=4+j5, (a)...Ch. 2 - Convert the following instantaneous currents to...Ch. 2 - The instantaneous voltage across a circuit element...Ch. 2 - For the single-phase circuit shown in Figure...Ch. 2 - A 60Hz, single-phase source with V=27730 volts is...Ch. 2 - (a) Transform v(t)=75cos(377t15) to phasor form....Ch. 2 - Let a 100V sinusoidal source be connected to a...Ch. 2 - Consider the circuit shown in Figure 2.23 in time...Ch. 2 - For the circuit shown in Figure 2.24, compute the...Ch. 2 - For the circuit element of Problem 2.3, calculate...Ch. 2 - Prob. 2.11PCh. 2 - The voltage v(t)=359.3cos(t)volts is applied to a...Ch. 2 - Prob. 2.13PCh. 2 - A single-phase source is applied to a...Ch. 2 - Let a voltage source v(t)=4cos(t+60) be connected...Ch. 2 - A single-phase, 120V(rms),60Hz source supplies...Ch. 2 - Consider a load impedance of Z=jwL connected to a...Ch. 2 - Let a series RLC network be connected to a source...Ch. 2 - Consider a single-phase load with an applied...Ch. 2 - A circuit consists of two impedances, Z1=2030 and...Ch. 2 - An industrial plant consisting primarily of...Ch. 2 - The real power delivered by a source to two...Ch. 2 - A single-phase source has a terminal voltage...Ch. 2 - A source supplies power to the following three...Ch. 2 - Consider the series RLC circuit of Problem 2.7 and...Ch. 2 - A small manufacturing plant is located 2 km down a...Ch. 2 - An industrial load consisting of a bank of...Ch. 2 - Three loads are connected in parallel across a...Ch. 2 - Prob. 2.29PCh. 2 - Figure 2.26 shows three loads connected in...Ch. 2 - Consider two interconnected voltage sources...Ch. 2 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - A balanced three-phase 240-V source supplies a...Ch. 2 - Prob. 2.41PCh. 2 - A balanced -connected impedance load with (12+j9)...Ch. 2 - A three-phase line, which has an impedance of...Ch. 2 - Two balanced three-phase loads that are connected...Ch. 2 - Two balanced Y-connected loads, one drawing 10 kW...Ch. 2 - Three identical impedances Z=3030 are connected in...Ch. 2 - Two three-phase generators supply a three-phase...Ch. 2 - Prob. 2.48PCh. 2 - Figure 2.33 gives the general -Y transformation....Ch. 2 - Consider the balanced three-phase system shown in...Ch. 2 - A three-phase line with an impedance of...Ch. 2 - A balanced three-phase load is connected to a...Ch. 2 - What is a microgrid?Ch. 2 - What are the benefits of microgrids?Ch. 2 - Prob. CCSQCh. 2 - Prob. DCSQ
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- Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) Falsearrow_forwardThe input power to a 3-phase load is measured as 11kw. If the line current and power factor of the load are 32 A and 0.7, then the value of line voltage is given by,?arrow_forwardA three-phase positive sequence Υ-connected source with Van=50 |_30˚ Vrms , phase It feeds a balanced Y-connected load with an impedance of (67+j5) ohms per . If the impedance per phase of the line between source and load is also (1+j) ohms, find the total complex power of the load and draw the power triangle of the load.arrow_forward
- A balanced delta-connected load has phase impedances of 4+j3 Ohms. It is connected to balanced transmission lines, with Vab = 1.5kV @ 15 degrees. a) What is the current through each of the load phases? b) What is the current through each of the transmission lines? c) Which ACSR cable should be used for these transmission lines to give a 20% current rating margin for this load?arrow_forwardA balanced three-phase ∆- connected source has a line voltage 120 V. It is connected to a load via a three-wiretransmission line. The per-phase impedance of the ∆-connected load is 30 + j120 Ω. The impedance of each wireof the transmission line is 2 + j4 Ω.How much power is dissipated by the load? How much power is dissipated in transmission line? Power factor of load?arrow_forward2. A balanced three-phase source furnishes power to the following three loads: Load 1: 8 kVA at 0.83 pf lagging Load 2: unknown Load 3: 10 kVA at 0.7071 pf leading If the line current is 72 Arms, the line voltage at the load is 221 Vrms, and the combined load has a 0.8 pf lagging, determine the unknown load.arrow_forward
- A load of 135 MW at a power factor of 0.6 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 57 kV and the loss in the transmission is 6.5% of the power delivered. (Consider the line to be a short transmission line) Find A) Single phase Power delivered B) Per phase voltage C) Current flowing through the transmission line D) 3 Phase Losses in the transmission line E) Per phase resistance of the transmission linearrow_forwardFor a balanced three-phase Y-Δ system - Line voltage: 240V - total apparent power supplied: 4800 VA - power factor angle of the load: -50⁰ - line impedance: negligible Find the impedance of the load. Impedance of the load is: BLANK EXPRESS YOUR ANSWER IN RECTANGULAR FORMarrow_forwardA set of balanced three-phase transmission lines with line-to-line voltages of 13 kV is connected to a balanced wye load with phase impedance of 8 + j3 Ohms. What is the real power delivered to the three-phase load?arrow_forward
- Determine the line current of a Y-connected balanced three-phase load, consuming 300 kW at power factor = 0.8 lagging and operating at 480 V. Work on PER UNIT with Sbase = 375 kVA and Vbase = 480V. Choose the best answer.arrow_forwardEE A balanced 3-phase Y-connected source has using positive phase sequence, ? = 390∠30˚ ?. Find the complex expression of voltage Eab.arrow_forwardAn acb sequence balanced three-phase Y-connected source supplies power to a balanced, three-phase Δ-connected load with an impedance of 15 + 6i Ω/ϕ. The source voltage in the b-phase is 240∠−45∘ V. The line impedance is 1 + 1i Ω/ϕ. Use the single phase equivalent circuit for the a-phase to find the current in ampere in the a-phase of the load. Express your answer using polar notation, only provide the polar angle in degrees.arrow_forward
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