Q5: For the circuit in the figure, Determine the complex power delivered to the three-phase load. The phase voltages of the Y-connected source are v, = 11020°v rm s; V, = 1102-120°V rm s; V, = 1102120°V rm s; . The load impedances are Z = 50+ j80; ZB = j50; Zc=100+ j25? www N. IN

Q5: For the circuit in the figure, Determine the complex power delivered to the three-phase load. The phase voltages of the Y-connected source are v, = 11020°v rm s; V, = 1102-120°V rm s; V, = 1102120°V rm s; . The load impedances are Z = 50+ j80; ZB = j50; Zc=100+ j25? www N. IN

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Give your background about the AC systems from single phase and three phase systems to their connections including their currents and voltages laws with the suitable diagrams.
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1.1 We have two loads in delta and another in star in parallel, the impedances of the branches of the delta are equal and we have that RΔ=1p.u. and XΔ=0.75 p.u., while in the star we have equal values of the branches, but formed by admittances where we have the conductance in parallel GY=0.64 p.u. and inductive susceptance of BY=-j0.48 p.u. If the loads are being supplied by a positive sequence balanced three-phase source with line-to-line voltage of phases a and b of Vab=1∠ 30º, if the base values are line-to-line base voltage of 1kV and three-phase base power of 100kW. DetermineA) Line and phase voltages, line and phase currents of the load in delta, line and phase voltages of the star, line and phase currents of the star.B) Obtain separately the phasor diagram of the delta and star load with the values obtained in A), indicate on the scale that these are 1 p.u.=5cm for example.C) obtain the power triangle and the power factor separately for each load. D) Obtain the power…
Problem 2 The circuit diagram of a certain load is presented below. Determine the following: a. The power factor of the load. b. If the load is connected across a 400 Vrms source, determine the real and reactive power consumed by the load. c. From (b), determine the value of the capacitor to be placed in parallel with the load in order to improve the power factor of the load to 95% lagging. From (b), A synchronous motor is installed in parallel with the load to correct the pf. The motor is rated 5 hp operating at 60% efficiency. Assuming that the motor is running at rated power. Determine the apparent power and power factor of the motor in order to improve the load's pf to 95% lagging. 202 500 µF HI + VL -20 mH 5Ω >0.5VL m 15 mH
5.7. In Figure P5.7, the voltages at a, b, and c are balanced 30. Transformers are ideal and have the same turns ratio. Find the voltages Va, Vic, and Vea in terms of Vab, Vher and V ca (a) Are they balanced 30? (b) If not, how would you reconnect the transformers to obtain balanced 36? a rele b 6 b' 000 ( Figure P5.7
In a given system of base power of 250 MW, and bus 3 is taken as reference. The per-unit reactances are X₁2 = 0.2 p.u., X13 = X23 = 0.1 p.u. If the power flow in the system is given as: PF12 = 100 MW, PF13 = 50 MW, PF23 = -150 MW, then the phase angles are Select one: O a. 0₁ = 0.02 rad., 0₂ = 0.06 rad., 03 = 0 rad. O b. None of these O c. 8₁ = 0.02 rad., 02 = -0.06 rad., 03= 0.1 rad. O d. 0₁ = 0.02 rad., 02 = -0.06 rad., 03 = 0.2 rad. O e. 8₁ = 0.02 rad., 8₂ = -0.06 rad., 03 = 0.1 rad. O f. 0₁ = 0.02 rad., 02 = -0.06 rad., 03 = 0 rad.
Q2
Which one of the following statements is true: The purpose of the power-factor correction is to add inductive elements to keep real power at a minimum level. The purpose of the power-factor correction is to add resistive elements (typically resistances) to improve the total reactive power. The purpose of the power-factor correction is to add reactive components (typically capacitive) to establish a system power factor closer to unity. The purpose of the power-factor correction is to add resistive elements (typically resistances) to establish a system power factor closer to zero.
An impedance z₁ = 8j5ohms is in parallel with an impedance z₂ = 3 + j7ohms. If 100V are imposed on the parallel combination. Find the branch current 11, 12 and the resultant current. Draw the corresponding phasor diagram showing each current and voltage drop across each parameter. Calculate also the equivalent resistance, reactance and impedance of the whole circuit.
A three-phase system has balanced conditions so that the per-phase circuit representation can be used as shown in Figure 1 Select the turns ratio of the step-up and step-down transformers that the system operates with an efficiency greater than 99 percent. Moreover, find the complex power (received or given) of all components in the circuit and the V1 and V2 voltages. The load voltage is specified as 4 kV rms, and the load impedance is 4/3 ohm. ..
Determine the value of the impedance, Z₁, that causes maximum power transfer in the circuit shown in Figure Qlc. 52 j24n -j12.35n (V₂) j2403 j24n Figure Qle B
In the figure, bus 1 is the reference bus, V1 = 1.06 p.u and the angle is 0.. A load with active power= 100 MW and reactive power = 50 Mvar is connected to bus 2. The line impedance is z12 = 0.12 + j0.16 p.u on a base of 100 MVA. Start with an initial estimate of |V2|0) = 1.0 p.u and 820) = 0•. Find |V2| () (one iteration). 100 MW 212 = 0.12 + j0.16 ++ 50 Mvar Vị = 1.0/0° О а. |V2| (1) = 0.4 p.u. Ob. |V2| (1) = 0.5 p.u. Oc. |V2| (1) = 0.7 p.u. d. (1) = 0.8 p.u. е. |V2| (1) = 0.6 p.u.