Abstract
In the early days of electric power systems, it was the usual practice to have frequent line transpositions to reduce capacitive and inductive unbalances on them. Transposition represents higher line costs owing to the presence of transposition towers and results in lower mechanical and electrical strength. These disadvantages make it desirable not to transpose lines if the resulting unbalances are not adverse. In this paper, the inductive unbalances of a single- and a double-circuit untransposed transmission line are analysed. Effects of loads, of line geometric mean radii and of line ground wire arrangements are included. Results for negative- and zero-sequence components which arise from such unbalances for power systems with typical lines are given and compared with those obtained using methods developed earlier.
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