Principles of Electrical Transmission Lines in Power and Communication

The Commonwealth and International Library: Applied Electricity and Electronics Division

J. H. Gridley, P. Hammond

• Publisher: Pergamon
• Year: 2014
• Print ISBN:
  9780080121116
• eBook ISBN:
  9781483186030
• Topic: Technology & Engineering
• Subtopic: Physics
• Index: Physics

Principles of Electrical Transmission Lines in Power and Communication is a preliminary study in the transmission of electricity, which particularly discusses principles common to all electrical transmission links, whether their functions be communication or bulk power transfer. This book explains the propagation on loss-free lines I and II and introduces the finite loss-free lines. The sinusoidal excitation of dissipative lines I and II is then examined, and the occurrence of standing waves and quarter-wave is then discussed. This text also looks into topics on frequencies. This book will be invaluable to students and experts in the field of electronics and related disciplines.

CHAPTER 1

Propagation on Loss-free Lines I (The Infinite Loss-free Line)

Publisher Summary

The use of electricity in communication or power requires that as much as possible of the electrical energy generated in a source is transferred to a load. The physical appearances of systems to affect this transfer differ according to the nature of the undertaking; there is a little in common between the high-voltage lines of a major power system and the coaxial cable between aerial and television set. Certain principles underlie the operation of both systems and such principles are to be established. The connection of a source to a load forms a complete circuit. This circuit affects the desired energy transference, but might also dissipate an appreciable amount of energy as heat and store energy in magnetic and electric fields. The circuit must be regarded as having resistance, inductance, and capacitance. It might be that by far the greater part of the energy dissipation or storage is localized, in which case the appropriate parameter can be regarded as concentrated and the familiar concept of a network of “lumped” parameters follows. This chapter discusses the problems that arise when a finite number of lumped elements no longer suffice to describe a process of electrical energy transference.

1.1 The General Transmission-line Problem

The use of electricity in communication or power requires that as much as possible of the electrical energy generated in a source be transferred to a load. The physical appearances of systems to effect this transfer differ greatly according to the nature of the undertaking; there is...

Table of contents

• Cover image
• Title page
• Table of Contents
• THE COMMONWEALTH AND INTERNATIONAL LIBRARY
• Copyright
• Preface
• Synopsis
• Acknowledgements
• Chapter 1: Propagation on Loss-free Lines I (The Infinite Loss-free Line)
• Chapter 2: Propagation on Loss-free Lines II (Effect of Terminations and Junctions)
• Chapter 3: Finite Loss-free Lines: An Introduction
• Chapter 4: Sinusoidal Excitation of Dissipative Lines I (Steady-state Solution of General Equations)
• Chapter 5: Sinusoidal Excitation of Dissipative Lines II (Characteristic Impedance, Attenuation, Distortion)
• Chapter 6: Potential and Current Distribution: Standing Waves
• Chapter 7: Lumped-circuit Equivalents
• Chapter 8: Low-frequency Transmission Lines I (Steady-state Operation of Power Transmission Lines)
• Chapter 9: Low-frequency Transmission Lines II (Stability of Transmission Systems)
• Chapter 10: Audio-frequency Lines
• Chapter 11: The Transmission Line at Radio Frequencies I (Introductory)
• Chapter 12: The Transmission Line at Radio Frequencies II (Propagation Characteristics)
• Chapter 13: The Terminated Radio-frequency Line
• Chapter 14: Measurement of Standing-wave Ratio
• Chapter 15: Travelling Waves on Electrical Power Lines
• Chapter 16: Transmission-line Parameters
• APPENDIX I: The Growth of Current in an Inductive Termination
• APPENDIX II: Solution of a Wave Equation by the Method of Laplace Transforms
• APPENDIX III: Useful Expressions: Hyperbolic Functions
• Answers to Exercises
• Index