Effect of Soil Environment on HVDC Interference to Buried Metal Pipeline

A numerical simulation technology was used to study the effect of soil environment on the interference from ground electrodes in high voltage direct current (HVDC) transmission system to long-distance transmission pipelines, and the simulation results were verified by field monitoring data. The results show that when the thickness of the surface soil was more than 9 km, the effect of deep soil resistivity could be neglected. The degree of interference was greatly affected by the soil near the DC ground electrodes and the soil near the pipe closest to the DC ground electrodes. If the DC ground electrodes were unavoidable near the buried pipeline, they should be buried in the area with low soil resistivity as much as possible.The potential distribution along the pipeline calculated by the simulation was basically consistent with the on-site monitoring data, so this numerical simulation method can accurately predict the effect of soil environment on the interference from HVDC ground electrodes to buried metal pipeline.