红壤地区地铁杂散电流分布规律研究
程宏波1卢伟楠1谢子宁1林珊2王芳玲2
Distribution Law of Metro Stray Current in Red Soil Region
CHENG Hongbo1LU Weinan1XIE Zining1LIN Shan2WANG Fangling2
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作者信息:1.华东交通大学电气与自动化工程学院， 330013， 南昌
2.广州地铁设计研究院股份有限公司， 510010， 广州
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Affiliation:1.School of Electrical and Automation Engineering, East China Jiaotong University, 330013, Nanchang, China
2.Guangzhou Metro Design and Research Institute Co., Ltd., 510010, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20245830
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中图分类号/CLCN:U231.8
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栏目/Col:供电与能源
摘要:
［目的］红壤的pH值、含盐量、土壤电阻率等土壤特性与其他类型土壤有较大区别，导致红壤环境下杂散电流对沿线金属设施的腐蚀更为严重。应仔细分析红壤地区地铁杂散电流的分布规律，并研究红壤环境下杂散电流的有效防护措施。［方法］分析了杂散电流在土壤中的电流密度及电位梯度分布规律。建立了地铁线路杂散电流仿真模型，分析了红壤环境下地铁杂散电流在土壤中的横向及纵向分布规律，以及杂散电流所引起的电位梯度分布情况。将红壤与3种典型土壤（漠土、高山土及盐碱土）进行对比，研究了不同土壤环境下杂散电流分布的区别。分析了钢轨电阻、轨地电阻及供电电压对红壤中杂散电流引起的地电位的影响规律及影响范围。［结果及结论］红壤环境下，杂散电流沿线路中心线向两侧逐渐减小,经土壤泄散后在变电所附近出现回收现象。相较于其他3种土壤，红壤环境下杂散电流的影响范围更广，可通过减小钢轨纵向电阻、增加轨地电阻、提高供电电压等措施来减小红壤中杂散电流的影响。
Abstracts:
［Objective］ Due to the significant difference in soil characteristics compared to other types of soil, such as pH value, salinity, and soil resistivity, the red soil features more severe corrosion of metal facilities along metro lines caused by the stray current in its environment. Therefore, it is necessary to thoroughly analyze the distribution law of metro system stray current in red soil regions, exploring effective protection measures against stray current in such environments. ［Method］ The distribution law of current density and potential gradient of stray current in soil is analyzed. A simulation model of metro line stray current is established to analyze the transverse and longitudinal distribution law of metro stray current in red soil environments, as well as the associated potential gradient distribution. The red soil is compared with three typical types of soil (desert soil, alpine soil, and saline-alkali soil) and the differences in stray current distribution under various soil conditions are studied. The influence law and impact range of rail resistance, rail-to-earth resistance, and power supply voltage on the ground potential caused by stray current in red soil are also analyzed. ［Result & Conclusion］ In red soil environment, stray current gradually decreases from the centerline of metro line toward both sides, and after dissipation through the soil, a recovery phenomenon occurs near substations. Compared with the other three soil types, the stray current in red soil has a wider impact range. Measures such as reducing the longitudinal resistance of rails, increasing the rail-to-earth resistance, and raising the power supply voltage can effectively reduce the impact of stray current in red soil.
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