|AC Interference and Fault Current Impact Assessment from a 400kV OHL upon an adjacent High Pressure Gas Pipeline
ERM was asked to assess the impact from a 400kV overhead line (OHL) upon a High Pressure Gas Pipeline that runs semi-parallel for a considerable length of the pipeline.
Normal OHL power loading was to be examined to determine the risk of corrosion of the pipeline due to long-term current flow. Transient current surges were to be analysed to evaluate whether potentials on the pipeline could exceed pipeline coating stress limits or if operator could be exposed to dangerous voltage levels at test posts.
Careful and accurate analysis was required in order that any interference that could potentially damage the integrity of the pipeline was identified and mitigated.
Where the need for mitigation was identified, the type, amount and location of installation needed to be determined.