This paper discusses case studies of high voltage direct current (HVDC) & high voltage alternating current (HVAC) crossing Pipelines right of way (RoW) showcasing the effects of alternating current (AC) interference with respect to AC corrosion and Safety Hazards while running parallel and crossing at different angles to the same pipeline at multiple locations in a short span of length and restricting the AC current & safe voltage within maximum tolerable limits through deployment of mitigation measures as per industry code of practice, globally.

The paper discusses effects of both powerline fault conditions as well as induced steady state on underground pipelines, AC interference modelling for enhancing effectiveness of Cathodic protection and analysis of AC interference mitigation measures. A comprehensive technical analysis involving collection of baseline information on both the pipeline and powerline and determining powerline fault current effects adjacent to each tower, on the pipe wall, the pipe coating, and the resulting safety hazard for pipeline personnel.

Subject
High voltage direct current, Piping, Voltage, Pipelines, Grounding, Transmission lines, Personnel, Current densities, Health, safety, and environment, Towers, AC interference, Electrical interference, Line current
Keywords:
HVDC/HVAC Powerline crossings, steady state & fault condition, AC Interference
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2021
Association for Materials Protection and Performance (AMPP)
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