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This paper details a comprehensive AC interference analysis and implementation of an extensive AC corrosion mitigation and monitoring system for a 100-mile (328 kilometer) portion of a regulated pipeline.
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Frequency dependence of the phase relation of the power line currents (which contain harmonics of the fundamental AC frequency), the Earth response, and the pipeline response & how they can be combined to provide an AC risk assessment.
Case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. Includes the use of fast-response electrical resistance corrosion rate probe monitoring technology.
An AC interference study in advance of an upgrade of a transmission line. Field measurements on the pipelines were compared to computer modeling results and known operating loads to validate a baseline model.
Numerical modeling software is used to fit the real field AC interference data to verify the rationality of related boundary settings. Then possible AC mitigation solutions are evaluated and optimized based on the verified software boundary settings.
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.