Please only expert should solve this question only Example 12.12Consider the unbalanced A-A circuit in Fig. 12.30. Use PSpice tofind the generator current Lab, the line current IB, and the phasecurrent Inc12.9PSpice for Three-Phase Circuits531awwA202m15 Ω208/10° V€ 5022018/130 Vbww202mj5QB-1402208-110° V130 Ω202j5Qww-mCFigure 12.30For Example 12.12.

Answered: Image /qna-images/answer/dd7dcdbb-0ff6-4975-a7e6-9cf70f89da3f.jpg

Answered: Example 12.12 Consider the unbalanced…

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

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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
The three-wire 230/460 V rms 60 Hz system, shown in figure 12.29, supplies power to three loads: the AN load demands a complex power of 10 /40° kVA, the NB load draws 8 /10° kVA, and the AB load requires 4 /-80° kVA. Determine the two currents, the line and the neutral.
Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.
The circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three-phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and IT
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A single-phase power system is shown as the equivalent circuit below. The system has a 480V generator connected to an ideal 1:10 step-up transformer (no losses), a transmission line, an ideal 20:1 step-down transformer and a load all in series as shown. The resistance of the transmission line is 20 S2 and the reactance j60 , a load is connected to the system with an impedance of 10/30° №. For the analysis of the system, use base values of 10 kVA and 480 V at the generator, find (a) per unit values of all impedances, (b) per unit current, (c) load power (W), (d) power loss (W). NG 480 20⁰ V 10 kVA Zone 1 1:10 20 Ω j60 Ω ZL Zone 2 20:1 ILoad Zone 3 ZLoad 10/30° Ω
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.
2. A single-phase a.c. distributor AB is fed from end A and has a total impedance of (0-2 +j03) ohm. At the far end, the voltage VR = 240 V and the current is 100 A at a p.f. of 0-8 lagging. At the mid-point M, a current of 100 A is tapped at a p.f. of 0-6 lagging with reference to the voltage Vy at the mid-point. Calculate the supply voltage V and phase angle between V and Vg- [292 V, 2-6°] T 40 A
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3. A three phase source, 4-wire having a per phase voltage of 230V. An unbalanced load is connected to the three phase source. The load impedances are: Zan = 15253.13° N; Zbn = 152-53.13° ; Zen = 150° Assuming negative sequence and the reference is the phase voltage "a", determine: a. the line current "a" b. the line current “b” c. the line current "c". d. the total real power e. the total reactive power f. the total apparent power g. the overall power factor h. the neutral current.
VASSESSMENT PROBLEM Objective 5-Be able to analyze circuits with ideal transformers 15 The source voltage in the phasor domain circuit in the accompanying figure is 25 /0° kV. Find the amplitude and phase angle of V2 and I2. 1.5 kn j6 kN 25:1 V2 --j14.4 N V, Ideal

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