Abstract
Recently developed extended transmission line (TL) approach and generalized formulas of external electromagnetic (EM) fields generated from a multiphase underground cable are reviewed and summarized in this paper. The lateral external EM field components of a three-phase underground cable with different arrangements are evaluated by classical and extended TL approaches. Two phase and single-phase energizations are applied to the cable. The characteristics of external EM fields at different field observation points are calculated.
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