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Stray Current Interference Simulation and Mitigation Associated with Light Rail Transit (LRT) Systems and Adjacent Metallic Pipelines – A Case Study

During operation of DC rail transit systems, DC current will follow the path of least resistance when returning to the Traction Power Substations (TPSS) to complete the electrical circuit. If the track-to-earth resistance (resistance between the train rails and surrounding soil) is not sufficient, current can leak off the LRT track system into the surrounding soil. Metallic facilities such as pipelines in the soil offer lower resistance paths for the current while returning to the TPSS.

Product Number: 51323-18926-SG
Author: Boshra Momen Nejad, Jeffrey Delorme, Brandon Miller
Publication Date: 2023
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In this case study we integrated 3D modeling including polarization into the design of Direct Current (DC) stray current interference mitigation associated with Light Rail Transit (LRT) systems and adjacent metallic pipelines. Simulation results identify interference hot spots by predicting interference current density and potential shifts along pipelines under study. This approach in analyzing stray current interference provides proactive monitoring solutions to address pipeline integrity concerns. The simulation tool also predicts pipeline polarized off potentials, which could be measured at recommended test post locations and compared against NACE potential shift criteria during future monitoring.

In this case study we integrated 3D modeling including polarization into the design of Direct Current (DC) stray current interference mitigation associated with Light Rail Transit (LRT) systems and adjacent metallic pipelines. Simulation results identify interference hot spots by predicting interference current density and potential shifts along pipelines under study. This approach in analyzing stray current interference provides proactive monitoring solutions to address pipeline integrity concerns. The simulation tool also predicts pipeline polarized off potentials, which could be measured at recommended test post locations and compared against NACE potential shift criteria during future monitoring.

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