Study on the Interference of the HVDC Transmission Grounding Electrode to the Pipeline Cathodic Protection System

[Image: see text] Oil and gas are still largely transported by long-distance pipelines. In this study, we aimed to examine the impact of the high-voltage DC transmission grounding electrode on long-distance pipelines’ cathodic protection system nearby. The writer built the interference model of the DC transmission grounding electrode on the pipeline using COMSOL Multiphysics based on the parameters of the actual project and considering the cathodic protection system within and then tested the model using experimental data. By simulating and calculating the model under different conditions of grounding electrode inlet current, grounding electrode-pipe distance, soil conductivity, and pipeline coating surface resistance, we obtained the current density distribution in the pipeline and the cathodic protection potential distribution law. The outcome presents a visual representation of the corrosion occurring in adjacent pipes as a result of DC grounding electrodes operating in monopole mode.