Transmission line design — II: The line of maximum economy

A rational method is developed for the complete design of a transmission line. The most economical conductor diameter together with the most economical transmission line voltage are found from Kelvin´s Law applied so as to include all cost factors which vary with the conductor area. Rational formulas are developed for finding conductor spacings for both single circuit and double circuit towers. A method is developed for finding the most economical tower heights and spacings. The influence of this method of design upon the line constants is pointed out. A worked out problem is presented to illustrate the use of the method proposed, and vector diagrams are included, showing the complete line performance at both the generator and receiver ends of the line.