磁暴作用下管道漏点对地磁感应电流和管地电位分布的影响

The Influence of Pipe Leakage Point on the Distribution of Geomagnetically Induced Current and Pipe-Soil Potential under Geomagnetic Storms

随着能源需求的快速增长,中国的能源进口日益扩大。管道运输是一种重要的能源运输方式。埋地金属管道由于工艺、运输和安装等问题,常常存在着漏点,而漏点对管道的腐蚀及管道的防护有重要的影响,因此研究管道漏点的影响对研究地磁暴侵害埋地管道系统具有重要的意义。通过分析漏点的物理模型,建立了管道漏点的数学模型,并通过ANSYS软件仿真进行对比,验证了管道漏点模型的正确性。将漏点模型与管道的分布参数模型相结合,通过仿真分析,初步分析了管道漏点对地磁暴侵害管道系统时管道上地磁感应电流(geomagnetic induced current,GIC)及管地电位(pipe-soil potential,PSP)分布的影响。通过仿真结果数据表明,即使是遭受中、小型地磁暴侵害,管道漏点对管地电位的分布也很有影响,管道漏点处的泄露电流密度也远远超过正常情况下的杂散电流密度,会对管道的绝缘层及保护系统产生较大的影响。

With the rapid growth of China’s energy demand,China’s energy imports are expanding. Among all the energy transportation methods,pipeline transportation is an important one. There are always some leakage points on the buried metal pipes due to the transportation and installation. Leakage point has an important impact on the corrosion and the protection of the pipeline,so it is of great significance to study the effect of leakage point on pipelines when geomagnetic storms invade the buried pipeline systems. The mathematical model of the pipeline leakage point was established by analyzing the physical model of the leakage point,and was compared with ANSYS software simulation to verify the correctness of the model. Using the leakage point model and the distribution parameter model of the pipeline,the influence of the leakage point on the geomanetically induced current( GIC) and pipe-soil potential( PSP) along the pipeline during the geomagnetic storms is analyzed. According to the simulation results,even if the system is invaded by medium or small geomagnetic storms,the leakage point has some effect on the distribution of pipe-soil potential. The leakage current density at the leakage point of the pipeline is far greater than that under the normal situation,which has a greater impact on the insulation layer and the protection system of the pipeline.