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A study of alternating current (AC) interference on cathodically protected pipeline from railway electrification systems was conducted with a continuous data logger developed specifically for the purpose.
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A comparative assessment of electrochemical properties of common AC mitigation materials, and assessment of common industry claims with respect to AC mitigation grounding. Provides the corrosion test data and technical information to support a decision for mitigation material selection.
This paper involved a case study of a project involving AC interference on pipelines located in Canada where soil resistivities increase rapidly by up to several orders of magnitude once water in the soil freezes in the winter.
Challenges associated with coordinating the modelling, design, and installation of an alternating current interference and mitigation systems. The project consisted of a 65 kilometer long double circuit 500 kilovolt (kV) overhead transmission in a heavily congested right-of-way corridor with more than 80 pipelines.
When a pipeline is co-located with an AC powerline, it is subject to AC interference effects. These AC interference effects can result in safety hazards to operating personnel and the public under powerline steady-state (normal operation) and fault (short-circuit) conditions.
AC interference analysis between high voltage AC (HVAC) powerlines and buried pipelines is a matter of current interest due to the growing number of right-of-ways shared between powerline and pipeline infrastructure. This is only expected to increase as the worldwide energy demand grows considerably over the next 30 years,1 and stricter environmental regulations and policies are applied. Therefore, AC interference will continue to be an issue of concern for powerline and pipeline operators to protect the public, environment, and maintain asset integrity.
An AC interference study was conducted in 2015 after the installation of a 240 kV powerline. Risk of AC corrosion was indicated. Describe are both the challenges and the solutions, including the design of a temporary mitigation system allowing energization of the powerline at reduced power.
A corrosion investigation performed in 2018 on an NPS 6, approximately 4 km long, polyethylene coated pipeline determined that the accelerated corrosion anomalies detected during in-line inspections (ILI) were due to AC corrosion. The AC and DC current densities on the AC coupons adjacent to these anomalies were above the limits recommended in NACE SP21424. It was also determined that the line was cathodically over-protected, and that most of the AC voltage measured on the line was due to 120 Hz AC ripple from a foreign rectifier.
This paper discusses how to determine the “safe” separation distance that is required for transmission powerline tower and an adjacent pipeline to avoid an arc from the former to the latter - based on research literature and standards. Mitigation.