Excerpt from Transmission Line Formulas for Electrical Engineers and Engineering Students

The first method, which is described in Chapter III, is in the form Of a chart which gives the regulation or voltage drop of a line, and which also shows directly the required size of conductor for given conditions. In Chapter IV are given formulas for distribution lines and transmission lines only a few miles long. These are extended in Chapter V by means of the constant K to apply to transmission lines of any length in ordinary practice. For purposes of checking different formulas, and for the calculation of extremely long and unusual lines, the fundamental formulas of transmission lines are expressed by rapidly converging series in Chapter VI. While these series require much more arithmetical work than the K formulas, they will give the exact results to any degree of accuracy desired. The method of convergent Series in volves the use of complex numbers, that is, numbers in which j terms appear. They are easier to handle, however, than logarithms, sines and cosines of angles, or hyperbolic functions, and therefore the use of these other mathematical functions has been avoided.

Pr�sentation de l'�diteur:

The chart and working formulas have for the most part been developed independently by the author. Where the same or similar methods have been previously published, the fact is generally stated in the footnotes, but it has not been found possible to make these references absolutely complete. The second part of the book is for reference and contains the derivation of the principal formulas used in connection with transmission lines. As many recent articles on transmission lines make use of formulas which are only roughly approximate, or are even incorrect, a reliable collection of formulas, with the method of obtaining them, should be found valuable. It should not be presumed, because the second part of the book requires the use of the integral calculus, that the working formulas will require a knowledge of higher mathematics. The first five or six chapters are complete in themselves, and are planned for the use of those who have an ordinary acquaintance with alternating-current calculations. H. B. DWIGHT. HAMILTON, CANADA, A ugust, ipi2.
(Typographical errors above are due to OCR software and don't occur in the book.)

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