AC Corrosion in Shared Corridors with Multiple Circuits

Greater electrical power demands in North America drive the need for new electric transmission lines with multiple circuits and to evaluate alternating current (AC) corrosion hazards. Unlike single-circuit corridors, AC corrosion analysis for multiple circuits under maximum transmission line loading may significantly underestimate the maximum induced voltage on inductively coupled pipelines. This article discusses the challenges that engineers will overcome in addressing shared corridors with multiple circuits, including phase configuration, power system rotation, power flow, and the importance of considering varying induction on shield wires.