Transposition of High-Voltage Overhead Lines and Elimination of Electrostatic Unbalance to Ground

Improvements and new developments in both the communications and power fields have, for the most part, eliminated the need for transposing high-voltage power lines at close intervals. In many systems transpositions are made only at switchyards and substations. Geometric unbalance of untransposed power lines leads to residual ground currents in solidly grounded systems. Methods of reducing the residual ground currents to tolerable levels are investigated in this paper.