| With the rapid growth of Chinese economy,electricity and oil and gas energy in short supply,and the construction of UHV grid and transportation of oil and gas engineering of our country to optimize our energy structure,promote economic development and makes great social significance.Due to the electrical energy transport and the transport of oil and gas,energy transmission path planning principles are extremely close,and this prompted a long-distance transmission lines and buried oil and gas pipeline parallel or intersecting,the transmission line electromagnetic effects of oil and gas transportation pipelines is increasingly prominent.This article in view of the UHV ac transmission line effect on buried oil and gas pipeline electromagnetic problems,study the complex conductor system of the earth return impedance calculation method under different soil model system.And based on the pipeline-earth circuit transmission line model,derived the analytical expression of the along pipeline voltage,the pipe butt matching impedance calculation formula of the largest anticorrosion layer interference voltage.And the calculating formula of maximum anticorrosive coating interference voltage was obtained when pipeline ends meet match impedance,and analyzed change rule of the pipeline interference voltage in different parallel pipeline length and soil resistivity and other cases.Established lOOOkV AC transmission lines and buried oil and gas pipeline parallel simulation model in combination with East Anhui power transmission project,and analyzed the pipeline interference voltage and alternating current density distribution of the parallel and cross section.And the transmission line electromagnetic influence to the adjacent pipeline was obtained.And the protection measures for alternating corrosion of buried oil and gas pipeline were given.Research and analysis show that the factors that significantly influence the interference voltage of buried oil and gas pipelines are the length of the parallel and the parallel spacing between pipelines and transmission lines,running current of transmission line,the resistivity of pipeline coatings and the connection of pipelines.With the increase of pipeline--transmission line parallel length,the interference voltage increases first and then decreases slowly,finally reaches a certain value.With the increase of pipeline—transmission line parallel spacing,the interference voltage increases first and then decreases,finally tends to 0.And it is the positive relationship between the interference voltage and running current of transmission line.Pipeline interference voltage increases with the increase of pipeline coatings the resistivity,finally reaches a certain value.And the pipeline interference voltage is minimum when ends of pipeline parallel section extend to infinity.When the buried pipeline and transmission line are parallel for a long distance,the transposition of transmission line will increase the interference voltage of the pipeline.When the soil resistivity is high,the soil layering will have great influence on the calculation of the interference voltage of the pipeline. |
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