轨道交通杂散电流在复杂地质条件下的分布  

Distribution of Stray Current in Rail Transit Under Complex Geological Conditions

作　　者：李雷 刘楠康 曾文 邵华锋 LI Lei;LIU Nankang;ZNEG Wen;SHAO Huafeng(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan,Guangdong 528000,China;Wuhan Xindian Electrical Co.,Ltd.,Wuhan,Hubei 430073,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000 [2]武汉新电电气股份有限公司,湖北武汉430072

出　　处：《广东电力》2019年第8期133-140,共8页Guangdong Electric Power

基　　金：中国南方电网有限责任公司科技项目(GDKJXM20162354)

摘　　要：城市轨道交通杂散电流经过大地进入交流系统,将对接地变压器产生直流偏磁的危害,而地下地质条件复杂,存在地形起伏和许多富水不良地质体,能够改变地下杂散电流和地下电位的分布。为此提出利用电性结构代替复杂地质体,仿真模拟和分析杂散电流在地下的传播过程的方法。首先,针对地形起伏仿真地形凹陷和地形隆起的多种组合模型,讨论地形起伏对电位和电流波动范围和幅值的影响;其次,针对富水张性断层构造,建立不同走向、宽度、深度和延伸长度的断层模型,研究分析断层构造对地下电流和电位波动范围和幅值的影响。研究结果表明,复杂地质条件在一定范围内对地下电流的分布影响较大,同时也是研究杂散电流对变电站安全运行影响的重要考虑因素。As stray currents in urban rail transit flow into the AC systems through the earth,the grounding transformers will suffer from DC bias.While underground geological conditions are complex with topographic relief and many bad rich-water geologic bodies,which can change distribution of underground stray currents and potentials.Therefore,this paper proposes a method of replacing complex geologic bodies by the electrical structure,simulating and analyzing propagation process of stray currents under the ground.Firstly,aiming at topographic relief,multiple combination models for topographic depression and rise are established by simulation and influence of topographic relief on fluctuation ranges and amplitudes of potentials and currents are discussed.Secondly,aiming at the rich-water extensional fault structure,fault models with different strikes,widths,depths and extensional lengths are established for studying and analyzing effect of the fault structure on fluctuation ranges and amplitudes of currents and potentials.The research result indicates that complex geological conditions will greatly affect distribution of underground current within limits and should be considered in analyzing safe operation of substations.

关 键 词：杂散电流 断层 电性结构 地表电位 地下水 

分 类 号：TM152[电气工程—电工理论与新技术]