Study on Lightning Dispersion and Breakdown Protection of Corrosion Protection Layer in Soil Adjacent to Buried Metal Pipeline

Transmission lines in the vicinity of natural gas pipelines are vulnerable to lightning strikes during operation. High amplitude lightning currents expose buried natural gas pipelines to shock potentials of a certain amplitude. In this paper, the safety protection of the intersection of natural gas pipelines and power lines has attracted extensive attention. This paper uses ATP-EMTP software to calculate the characteristics of the current waveform and the influencing factors of the pylons near the natural gas pipeline, establishes a three-dimensional finite element model of the pressure resistance of the natural gas pipeline electrode and the anticorrosion layer, and illustrates the mechanism of the generation of the difference between the pipeline electrode potential and the anticorrosion layer potential. Secondly, the effects of lightning current amplitude, soil conditions and pipeline distance on the impact potential of natural gas pipelines are analysed through simulations, and a lightning impact protection method for natural gas pipelines based on the vertical dimensional scattered current of piles is proposed. Finally, the practical application effect and technical economy are verified through simulation examples and engineering application simulation tests. The conclusions of this paper can provide references for the design, construction and safe operation and maintenance of natural gas pipelines.