Transmission Line Formulas 



PART I. 

 WORKING FORMULAS. 



CHAPTER I. 



INTRODUCTION. 



THE determination of the electrical characteristics of 

 transmission lines is a problem of considerable practical 

 importance to engineers. It occurs frequently in electri- 

 cal engineering work, and various methods have been pro- 

 posed for carrying out the calculations with greater or less 

 degrees of accuracy. Unfortunately, most of the methods 

 so far presented have been such as to require special mathe- 

 matical skill in using unfamiliar forms such as hyperbolic 

 sines, etc. Even the approximate methods, whose results 

 are not intended to be reliable for lines of considerable 

 length, are often too cumbersome to be used by an engi- 

 neer who has not time to make himself thoroughly familiar 

 with them. The result has been that engineers have often 

 been satisfied with calculations for practical cases which 

 were not nearly as correct as they might easily have been. 



Working methods have been developed, and are presented 

 in the following chapters, for solving problems in connec- 

 tion with actual transmission lines. As these working 

 methods involve comparatively simple operations in algebra 



