A interference model of grounded high-voltage direct current(HVDC)of±800 kV on buried pipelines was established based on COMSOL software,and the interference law of the grounded HVDC on buried pipelines was studied.The influencing factors of the minimum protection distance of pipelines were analyzed.The results indicate that pipeline length,type of pipeline anti-corrosion coating and soil conductivity have a significant impact on pipelines affected by grounded high-voltage direct current interference.The longer the pipeline,the higher the conductivity of the pipeline anti-corrosion coating,the lower the soil conductivity,and the larger the minimum protection distance of the pipeline,the greater the interference it is subjected to.When the length of the pipeline reaches or exceeds 600 km,the interference experienced by the pipeline tends to stabilize;Among the three commonly used pipeline anti-corrosion coatings 3PE,epoxy powder and petroleum asphalt,the pipeline using 3PE anti-corrosion coating has the smallest protection distance and the least interference;For multi-layer soil structure,the minimum protection distance of pipelines is mainly determined by the soil layer with the lowest conductivity,and the conductivity of the soil layer with the lowest conductivity can be regarded as the conductivity of overall soil.
关键词
高压直流/油气管道/电流干扰/最小防护距离/数值模拟
Key words
HVDC/oil and gas pipeline/current interference/minimum protection distance/numerical simulation
万方数据