Factors Affecting Induced Voltages on Underground Pipelines Due to Inductive Coupling with Nearby Transmission Lines

The induced voltage on the pipeline is a critical parameters to be evaluated for equipment and personnel safety of the pipeline system. However, in the real life, such estimation is difficult especially at the transmission line planning and routing stage. In this paper, several factors affecting the induced voltage on underground pipeline due to inductive coupling with nearby transmission lines are investigated. A peak induced voltage calculation formula as the function of the angle and separation distance between the transmission line and the pipeline is determined through the surface fitting of the simulation data. It is proved in the paper that other factors such as the length of the transmission line and the soil model types do not have significant influence on the peak induced voltage values.