Some
thirty years ago a well-known electrical engineer was ordered by his physician
to take a complete rest. During this period, as a diversion, he began to study
transmission-line calculations. Out of that came, in 1922, a book that was
quickly recognized as a classic on the subject because it was simple, practical
and useful. The man was William Nesbit; the book, Electrical Characteristics
of Transmission Circuits.
In the two
succeeding decades power-transmission systems grew tremendously in complexity.
Voltages were doubled, longer lines were built, inter connections became more
extensive, knowledge of how to protect against lightning was greatly increased,
and new methods of calculating performances were adopted. With all this grew
the need for a new book on transmission lines, one of broader scope that would
meet the new conditions, but retain the entirely practical viewpoint of its
predecessor.
In 1943 a second edition was brought out in which two chapters that discussed the general features of the electrical distribution problem were added at the end of the book. The third edition differed from the second edition only in that the two chapters were introduced just before the appendix.
In 1943 a second edition was brought out in which two chapters that discussed the general features of the electrical distribution problem were added at the end of the book. The third edition differed from the second edition only in that the two chapters were introduced just before the appendix.
A fourth
and completely rewritten .edition is presented herewith. It contains
essentially the material of the previous three editions, sometimes with new
authors, and three new chapters-Excitation Systems, Application of Capacitors
to Power Systems, and Power Line Carrier Application.
The
material presented here is naturally the results of research and investigations
by many engineers. It is not feasible to list here the names of the companies
and individuals whose work has been summarized. These acknowledgments are given
in the individual chapters. Much of the material used has been the result of
cooperative studies of mutual problems with engineers of electric-power
companies, the conductor and cable manufacturers, and the communication companies.
The authors gratefully acknowledge the hearty cooperation of those engineers
whose work has assisted in the preparation of this book.
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