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Experiments to study the effects of AC interference on cathodic protection (CP). Changes of CP potential and current density under AC interference and AC corrosion rates obtained. Effective CP potential under AC interference analyzed. Interference compared.
AC interference experiments were carried out to study the effects of AC interference on cathodic protection(CP) parameters and AC corrosion rate in different conditions. The effects of AC interference on CP current requirement and CP potentials were obtained for two different controlling modes of CP system such as constant potential mode and constant current mode. Based on weight loss experiments results of different AC current densities and CP levels AC corrosion risk assessment criteria graph considering both AC interference and CP parameters was established. Besides the AC corrosion mechanism for different levels of CP was studied and discussed.
Key words: AC interference, cathodic protection, changes of CP parameters, AC corrosion risk assessment
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.
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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.