Modeling and Simulation of Inductive Coupling Interference from Suburban Railways to Buried Pipelines
With the rapid development of suburban railways and oil and gas pipelines,parallel laying or cross-laying is inevitable for suburban railways and buried pipelines.In order to assess the impact of the traction power supply system of suburban railways on the safe operation of oil and gas pipelines,firstly,the mathematical model of the alternating current(AC)traction power supply system of the suburban railways and the adjacent buried pipelines was established,and the simulation based on CDEGS software was conducted.Next,the two cases of the oblique approach and parallel approach were unified by the equivalent distance method.The influence mechanism of the traction power supply system of the suburban railways on the adjacent buried pipeline was investigated,and the influence of factors including soil resistivity,distance between the conductor and the buried pipeline,locomotive load current,parallel length of railway and buried pipeline,pipeline coating resistivity,and number of current harmonics of electric multiple units on the inductive coupling voltage distribution along the pipeline was investigated.Finally,combined with the setting of a through ground line,four schemes to suppress the inductive coupling voltage were put forward for comparative analysis.The results show that the error of the equivalent distance method is within 5%when the ratio of the maximum distance to the minimum distance between the traction power supply system of the suburban railway and the buried pipeline is less than 4.5.The maximum value of the inductive coupling voltage of the pipeline increases with increasing soil resistivity.The decrease in the inductive coupling voltage is 50.6%when the distance between the suburban railway and the buried pipeline varies from 50 m to 250 m.The increase in the inductive coupling voltage rises significantly when the locomotive load current varies from 200 A to 1 000 A.The inductive coupling voltage increases from 22.6 V to 170.7 V when the parallel length varies from 2 km to 10 km.The harmonic content and the number of harmonics have a significant influence on the inductive coupling voltage.The best inductive coupling voltage suppression effect is achieved by adding a return line on the basis of the through ground line.
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