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The purpose of this paper is to present a method for the determination of inductive and capacitive unbalance for untransposed transmission lines. To accomplish this purpose, the conventional methods of symmetrical components are used. It is shown that the negative and zero-sequence currents in an untransposed line are functions of the positive-sequence load current, charging current, and line configuration. Calculated values of negative- and zero-sequence currents for typical configurations of high-voltage transmission lines are presented.