Negative sequence impedance is the impedance offered to negative sequence currents in an unbalanced three-phase system. Negative sequence currents arise during unbalanced faults, such as single-line-to-ground faults, line-to-line faults, and double-line-to-ground faults. Symmetrical components are used to analyze unbalanced faults, breaking down the unbalanced currents and voltages into three sets of balanced components: positive sequence, negative sequence, and zero sequence. Ne....
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