6th Edition

ISBN: 9780078028229

Author: Charles K Alexander, Matthew Sadiku

Publisher: McGraw-Hill Education

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Alternating Current (AC) is a type of electric power in which the electric current changes, both in magnitude and direction, at regular intervals. This AC Circuits can deliver power in either a Single Phase system or a Three Phase system.

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Textbook Question

Chapter 12.7, Problem 6PP

For the Y-Y circuit in Practice Prob. 12.2, calculate the complex power at the source and at the load.

A Y-connected balanced three-phase generator with an impedance of 0.4 + j0.3 Ω per phase is connected to a Y-connected balanced load with an impedance of 24 + j19 Ω per phase. The line joining the generator and the load has an impedance of 0.6 + j0.7 Ω per phase. Assuming a positive sequence for the source voltages and that Chapter 12.7, Problem 6PP, For the Y-Y circuit in Practice Prob. 12.2, calculate the complex power at the source and at the find: (a) the line voltages, (b) the line currents.

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Chapter 12.6, Problem 5PP

Chapter 12.7, Problem 7PP

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Calculate "terminal" phase voltage of phases "a" and "c" of generator. Calculate Vab and Vca across the load. Calculate three phase power supplied by the source. ]Calculate three phase power losses.

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.

AY-connected balanced three-phase source is connected to a three-phase balanced load through a four-wire three-phase cable. The generator has an impedance of 0.1+jo.3 2/phase. Each phase of the cable has an impedance of 2+2j N. The phase "B" load voltage is 102-140• kV. The impedance of each phase of the Y-connected load is 3-j5 0/phase. For a positive sequence: Calculate "internal" phase voltage of phase (a) of generator (emf) 1- 2- Calculate Vab across the load 3- Calculate three phase power supplied by the source

Chapter 12 Solutions

Fundamentals of Electric Circuits

Ch. 12.2 - Given that Vbn=22030V, find Van and Vcn, assuming...Ch. 12.3 - A Y-connected balanced three-phase generator with...Ch. 12.4 - One line voltage of a balanced Y-connected source...Ch. 12.5 - A positive-sequence, balanced -connected source...Ch. 12.6 - In a balanced -Y circuit, Vab=44015 and ZY = (12 +...Ch. 12.7 - For the Y-Y circuit in Practice Prob. 12.2,...Ch. 12.7 - Calculate the line current required for a 30-kW...Ch. 12.7 - Assume that the two balanced loads in Fig....Ch. 12.8 - The unbalanced -load of Fig. 12.24 is supplied by...Ch. 12.8 - Find the line currents in the unbalanced...

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