The current unbalance in two 113 mile long, electrically parallel, untransposed 500 kV overhead transmission line sections is studied for conditions in which some or all of the series-capacitor compensation is removed from individual circuits. It is shown that a negative sequence current of over 25% of the positive sequence line current can flow for certain phasing arrangements of the conductors and when one circuit is 70% series-capacitor compensated while the other circuit is uncompensated.
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Hesse et al. (1971) studied this question.
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