#2. In the 3-phase power system shown in Fig.2, the delta connected load is supplied through a short transmission line whose impedance Zuine =(0.1 +j5) Ohms. If the load impedance Zload = 4.5 36.87° Ohms per phase and the load voltage Vbc(t) = 208 sin (wt -120) V IA A Find (i) the phasor currents IA, IB, and Ic in the lines. Zline (ii VAB, the phasor voltage at the source. (iii) the real power P and the reactive power Q of the load. Ig B Ic ZL ZLO Zload с Fig 2

#2. In the 3-phase power system shown in Fig.2, the delta connected load is supplied through a short transmission line whose impedance Zuine =(0.1 +j5) Ohms. If the load impedance Zload = 4.5 36.87° Ohms per phase and the load voltage Vbc(t) = 208 sin (wt -120) V IA A Find (i) the phasor currents IA, IB, and Ic in the lines. Zline (ii VAB, the phasor voltage at the source. (iii) the real power P and the reactive power Q of the load. Ig B Ic ZL ZLO Zload с Fig 2

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 2.13MCQ

See similar textbooks

Similar questions

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.
Three Impedances each of (8 - j24)2 are connected in mesh across a three-phase 420V ac supply. Determine the phase current, line current, active power, reactive power drawn from supply. Also draw the Phasor diagram for the mesh connection and marks the Line current ,phase current line voltage and phase angle between phase current and pahse voltage. phase current (Ip) Line current real power reactive power
Draw a 3-phase wye-connected generator with transmission lines connected to a 3-phase delta-connected load. Assume the lines connecting them have an inductance of j5 per phase. The generated voltages are 120 Vrms with phase 'a' having a phase angle of 0°. The loads are 10 Ohm resistors per phase. When drawing, make sure to label all 3 phases with voltage phasors, line inductances, and load resistances.
The phase b voltage and the phase b current of a balance three-phase system are V = 220 sin (wt + 210°) and I = 10 sin (wt-180°). * A. 5256.44 W B. 5514.38 W C. 5715.76 W D. 6049.22 W
Two impedances are connected in parallel to the supply; the first takes a current of40A at a lagging phase angle of 300, and the second a current of 30A at a leadingphase angle of 450. Draw a phasor diagram to scale to represent the supply voltageand these currents. By calculation, determine the total current taken from the supplyand its phase angle. All currents are expressed in their r.m.s. values
= = Impedances Z₂ and z3 in parallel are in series with an impedance z₁ across a 100V,50Hz AC supply. Z₁ (6.25 +j1.25)ohms, Z₂ = (5 + j0)ohms and Z3 (5 - jxc)ohms. Determine the value of capacitance Xc said that the total current of the circuit will be in phase with the total voltage. What is then the circuit current and power?
Impedances Z2 and Z3 in parallel are in series with impedance Z1 across a 100 V, 50 Hz ac supply. Z1 =6.25 + j1.25 ohm; Z2 = 5+ j0 ohm and Z3 = 5-jXc ohm. Determine the value of capacitance of Xc such that the total curent of the circuit will be in phase with the total voltage. When is then the circuit current and power.
The values of the elements for the given circuit are given below.The maximum average power that can be transferred to the ZL load iswhich one?R1 = 400 OhmsL = 1000j OhmsR2 = 500 Ohms
1. a) Find the average power dissipated in the line shown.2. b) Find the capacitive reactance that when connected in parallelwith the load will make the load look purely resistive.3. c) What is the equivalent impedance of the load in (b)?4. d) Find the average power dissipated in the line when the capacitivereactance is connected across the load.5. e) Express the power loss in (d) as a percentage of the power lossfound in (a).
7. For the circuit below, calculate the value of Z₂ for maximum average power transfer to the load. In addition, determine the value of the maximum average power absorbed. (Hint: One approach is to find the open-circuit voltage and the short-circuit current.) j4 2 Vx -j2 n 16 Vx20 4/0° V ZL
The voltage between two phases in a balanced three phase-system (4 conductors) is U = 660V. The voltage between the phase and the neutral is: a) V = 1143 V b) V = 660 V c) V = 381 V A resistance R-30 2 is connected in series with an inductance (L) of reactance X₁.-40 52 and a capacitor (C) reactance Xc-40 Q.The equivalent impedance (Z) is equal to: a) 70 2 b) 30 (2 c) 50 2 The current absorbed by a resistive load of resistance 7.6 0, connected across the terminals of a battery of electromotive force E = 14 V and internal resistance r=0.4 0, is: a) 1 = 1.75 A b) I= 1.84 A c) 1 = 35 A
Question 1: Based on figure below: a. Find the total impedance Z, in polar form b. Draw the impedance diagram c. Find the current I and voltages VR, V, and Vc in phasor form d. Draw the phasor diagram of the voltages E, VR, Viand Vc, and the current I. e. Verify Kirchhoff's voltage law around the closed loop. f. Find the average power delivered to the circuit g. Find the power factor of the circuit, and indicate whether it is leading or lagging. h. What happened if Xc= 20 ? Please explain. R- 40 X, = 6N Xc = 10 N %3D + UR + UL + vc e = 70.7 sin 377t|