Unbalance of single circuit lines

IN RECENT YEARS, many new overhead lines have been built without transpositions in the individual line section and experience has indicated that transpositions are rarely necessary. The elimination of transposition structures leads to geometrical unsymmetry of the phases along the line section, and consequently to small electrostatic and electromagnetic unbalances. In this study are investigated characteristic electromagnetic unbalance factors of various configurations of single circuit lines, i.e., various triangular and flat arrangements without and with ground wires.