Study on Overvoltage and Protection of Buried Pipeline Near Lightning Strike Line Considering Soil Grounding Scatter

At present, the cross-adjacent conditions of oil and gas pipelines and power lines are more and more frequent. The lightning overvoltage problem under the condition of “two lines—one ground” cross-adjacent to each other has attracted the attention of different industries. Aiming at the lightning overvoltage protection problem of oil and gas pipelines near power lines, firstly, COMSOL Multiphysics software was used to establish the calculation model of lightning overvoltage under the condition of “two lines—one ground” cross adjacent to each other, to clarify the production mechanism of pipeline potential and potential difference of anticorrosive layer. Secondly, the influence law of soil resistivity and soil stratification on the amplitude of pipeline overvoltage is analyzed by simulation calculation, and the method of pipe-line overvoltage protection considering the scatter flow of tower grounding grid is proposed. Finally, the pipeline pressure limiting effect of the optimized transformation scheme is verified by a simulation example and its engineering application value is demonstrated. The conclusions of this paper can provide a reference for the design, construction and safety operation and maintenance of oil and gas pipelines.