6th Edition

ISBN: 9780078028229

Author: Charles K Alexander, Matthew Sadiku

Publisher: McGraw-Hill Education

Concept explainers

A short transmission line is a transmission line that has a length less than 80 kilometers, an operating voltage level of less than 20 kV, and zero capacitance effect.

Power Flow Analysis

Power flow analysis is a topic in power engineering. It is the flow of electric power in a system. The power flow analysis is preliminary used for the various components of Alternating Current (AC) power, such as the voltage, current, real power, reactiv…

Complex Form

A power system is defined as the connection or network of the various components that convert the non-electrical energy into the electric form and supply the electric form of energy from the source to the load. The power system is an important parameter …

Videos

Textbook Question

Chapter 12.7, Problem 8PP

Assume that the two balanced loads in Fig. 12.22(a) are supplied by an 840-V rms 60-Hz line. Load 1 is Y-connected with 30 + j40 Ω per phase, while load 2 is a balanced three-phase motor drawing 48 kW at a power factor of 0.8 lagging. Assuming the abc sequence, calculate: (a) the complex power absorbed by the combined load, (b) the kVAR rating of each of the three capacitors Δ-connected in parallel with the load to raise the power factor to unity, and (c) the current drawn from the supply at unity power factor condition.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 12.7, Problem 7PP

Chapter 12.8, Problem 9PP

Students have asked these similar questions

Three parallel three-phase loads are supplied from a 207.85-V rms, 60-Hz three-phase supply. The loads are as follows: Load 1: A 15 HP motor operating at full-load, 93.25 percent efficiency, and 0.6 lagging power factor. Load 2: A balanced resistive load that draws a total of 6 kW. Load 3: A Y-connected capacitor bank with a total rating of 16 kvar. (a) Draw the three-phase circuit. (b) What is the total system kW, kvar, power factor, and the supply current per phase? Please show formulas and work. (c) What is the system power factor and the supply current per phase when the resistive load and induction motor are operating but the capacitor bank is switched off? Please show formulas and work.

Two balanced Y-connected loads in parallel, one drawing 15 kW at 0.6 power factor lagging andthe other drawing 10 kVA at 0.8 power factor leading, are supplied by a balanced, three-phase,480-volt source.a. Draw the power triangle for each load and for the combined load.b. Determine the power factor of the combined load and state whether lagging or leading.c. Determine the magnitude of the line current from the source.

A single-phase 480020° V bus is connected to a single-phase 100KW motor operating at a lagging power factor of 0.8, a lighting load of 200 kW operating at a unity power factor, and static capacitors of 150kvar. Determine the following: (a) The total complex power supplied by the bus to the loads (b) The total current supplied to the bus (c) The power factor of the total load connected to the bus 1.4 Consider Problem 1.4 and use the bus voltage of 480020° V as the reference phasor. Determine the following: (a) The phasor current of the lighting load. (b) The phasor current of the motor. (c) The phasor current of the capacitor. (d) The total phasor load current. (e) Draw the phasor diagram of the voltage, all three load currents, and show how the three load currents combine to become the total load current in terms of phasor addition. 1.6

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...

Additional Engineering Textbook Solutions

Find more solutions based on key concepts

Three point charges of equal magnitude q, that will yield a zero net electric field at the origin.

Engineering Electromagnetics

When travelers from the USA and Canada visit Europe, they encounter a different power distribution system. Wall...

Electric machinery fundamentals

Electric power systems provide energy in a variety of commercial and industrial settings. Make a list of system...

Principles and Applications of Electrical Engineering

Find I0 and I1 in the circuit in Fig.P2.12.

Basic Engineering Circuit Analysis

How many coulombs do 93.8 1016 electrons represent?

Principles Of Electric Circuits

With respect to the circuit in Fig. 5.90, (a) employ Thévenin’s theorem to determine the equivalent network see...

Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.