This paper presents data and analysis from a case history involving the mitigation of AC interference on
multiple crude pipelines in a 130mile (210 km) long collocation with a new 345 kV High Voltage
Alternating Current (HVAC) power transmission line. The configuration was significantly more
complicated than the stated capacity of the predictive modeling software used. However, with some
compromises, predictive modeling using the software provided useful results and allowed for the design
of a successful mitigation system. Actual field data is compared to predicted AC interference levels and
the mitigation system details and operating characteristics are presented.
Keywords: HVAC interference, buried pipeline, power transmission line, mitigation/shield wire, DC
decoupler, predictive modeling, grounding