Q3) A 3-phase transmission line has an impedance of 0.5 + j2 Q/phase, Which supplies a A-connected balanced load with a complex power of 24+j10 kVA. If the line voltage at the load end has a magnitude of 230V, Calculate: (a) The magnitude of the line voltage at the source end (b) The source power factore

Q3) A 3-phase transmission line has an impedance of 0.5 + j2 Q/phase, Which supplies a A-connected balanced load with a complex power of 24+j10 kVA. If the line voltage at the load end has a magnitude of 230V, Calculate: (a) The magnitude of the line voltage at the source end (b) The source power factore

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.42P: A balanced -connected impedance load with (12+j9) per phase is supplied by a balanced three-phase...

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A 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.
The three-phase source line-to-neutral voltages are given by Ean=100,Ebh=10+240, and Ecn=10240volts. Is the source balanced? (a) Yes (b) No
Let a series RLC network be connected to a source voltage V, drawing a current I. (a) In terms of the load impedance Z=ZZ, find expressions for P and Q, from complex power considerations. (b) Express p(t) in terms of P and Q, by choosing i(t)=2Icost. (c) For the case of Z=R+jL+1/jC, interpret the result of part (b) in terms of P,QL, and Qc. In particular, if 2LC=1, when the inductive and capacitive reactances cancel, comment on what happens.
The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency components
Obtain the equivalent circuit of a 200/400 V, 50 Hz, single-phase transformcr from the following test data: O.C. test : 200 V, 0-7 A, 70 W .. on L.V. side S.C. test : 15 V, 10 A, 85 W Calculate the secondary voltage when delivering S kW at 08 p.f. lagging, the primary voltage being . on H.V. side 200 V. (R, = 57-14 Q ; X, = 330 2; R = 0-21 Q ; Xg, = 0-31 Q ; 3778 V)
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The one-line diagram of a three-phase power system is shown in the above figure. The line impedances are in per- unit on a 100-MVA base, and the line admittances are neglected. ' qu V = 1.05200 0.01+ j0.025 300 + j200 MVA 3 0.015 + j0.035 150 MW 200 + j150 MVA 0.01 + j0.03 |V = 1.03 The admittance matrix (Y_bus)? The bus power in per-unit?
an a transmission line has an impedance of 4 j2 Ohms/phase, Find the per-unit impedance of this line on a base of 100 MVA and 20 KV. Select one: O a. None of these Ob. 20-j10 (p.u) Oc 1-0.5 (p.u) O d. 0.5-j1 (p.u)
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2. A three-phase transmission line has parameters Xc-6 k 2, R-3.25 2 and X₁-25 92, and delivers 300 MW to a load with both ends of the line at 230 kV. Draw a pi equivalent per-phase circuit of the line. On a per-phase basis, calculate the active power delivered to the load, the reactive power of the line and the active power delivered by the source. Based on these calculations can the equivalent circuit be simplified further?
A load of 138+j460 Ohm is supplied through 3+j14 Ohm line as shown in Figure 1. (a) Find the average power dissipated in the line. (b) Find the value of capacitive reactance connected across the load to compensate the reactive power need of the load. (c) What is the equivalent impedance after compensation. (d) Find the average power dissipated in the line when the capacitive reactance is connected across the load. (e) Express the power loss in (d) as a percentage of the power found in (a) j14 Figure 1 7200/0 + V (rms) Source 3 wi Line Load 138 j460
Two 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.