When a paralleling power line or pipeline route has been committed to close to an existing utility, the induced AC (IAC) mitigation engineer may be severely limited in the techniques available to adequately ground the pipeline(s) where required. Such was the case on a recently completed 220kV wind farm transmission line in the southwestern United States. Very extensive computer modeling was required to find acceptable grounding techniques and practices on the four large diameter natural gas pipelines that were affected by the 220kV circuit. Work was divided into two phases so that the initial wind farm load could be safely transmitted before the complete mitigation package could be constructed. Design and construction of the phase 2 mitigation system required well over a year to complete and seriously delayed adding additional generation to the circuit.

Subject
Piping, Voltage, Conductors, Pipelines, Soil resistivity, Grounding, Transmission lines, Personnel, Health, safety, and environment, Construction, Wind, Risk reduction, Fault currents
Keywords:
AC mitigation, Computer modeling, Grounding, Induced AC
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2019
Association for Materials Protection and Performance (AMPP)
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