Abstract
A SIMPLE but satisfactorily approximate method of computing electromagnetic unbalances1 for double circuit lines, either with or without ground wires, results if the following simplifying assumptions are made: 1. The two circuits are symmetrically arranged on the transmission tower. 2. Line currents in each of the two circuits are balanced and equal. 3. External impedances Z ext terminating the lines are balanced. 4. Mutual impedances are small compared to self-impedances, and voltages induced through mutual impedance by small (negative- or zero-sequence) currents are negligible.
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