高速铁路高架段信号电缆雷电感应过电压计算研究  

Research on lightning induced overvoltage of signal cable in elevated section of high speed railways

作　　者：王州龙 张楠 WANG Zhoulong;ZHANG Nan(Signal&Communication Research Institute,China Academy of Railway Sciences Group Co.,Ltd.,Beijing 100081,China;CREEC East China Survery and Design Co.,Ltd.,Hangzhou 310009,China)

机构地区：[1]中国铁道科学研究院集团有限公司通信信号研究所,北京100081 [2]中铁二院华东勘察设计有限责任公司,杭州310009

出　　处：《重庆理工大学学报（自然科学）》2023年第12期284-292,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金高铁联合基金项目(U2268217);中国国家铁路集团有限公司科研专项(J2022G006)。

摘　　要：信号电缆外皮与芯线绝缘较弱,存在雷击感应过电压闪络造成信号系统损坏的风险。推导了雷电回击过程电磁场建模方法,对雷电回击电磁场激励下的信号电缆导线计算模型进行了研究,结合FDTD法给出了高架段信号电缆导线计算模型数值计算实现方法。计算了电缆芯线感应过电压,得到信号电缆芯线感应过电压大小与雷电回击通道到电缆的垂直距离、桥面距离地面的高度以及大地电阻率的关系。典型高速铁路高架桥结构中,当雷电回击电流一定时,电缆芯线感应过电压幅值随回击通道到电缆的垂直距离增大呈现非线性减小,电缆芯线感应过电压幅值随土壤电阻率增大呈现近似线性增大,电缆芯线感应过电压幅值随桥面距离地面的高度增大呈现近似线性增大。The insulation between the outer skin and core of the signal cable is poor,and thus there are risks of damage to the signal system caused by lightning induced overvoltage flashover.This paper builds the electromagnetic field modeling for the lightning return stroke process,and studies the calculation model of signal cable wires under the excitation of lightning return stroke electromagnetic field.Integrated with the FDTD,a numerical calculation implementation method for the calculation model of signal cable wires in elevated sections is proposed.The induced overvoltage of the cable core is calculated,and the relationship of the magnitude of the induced overvoltage of the signal cable core with the vertical distance from the lightning return channel to the cable,the height of the bridge deck from the ground,and the earth resistivity is obtained.In a typical high-speed railway elevated bridge structure,when the lightning return current is constant,the induced overvoltage amplitude of the cable core decreases non-linearly as the vertical distance from the return channel to the cable grows whereas it increases approximately linearly with the rise of both soil resistivity and the height of the bridge deck from the ground.

关 键 词：高速铁路 信号电缆 雷电感应过电压 雷电回击 电磁场建模 

分 类 号：TM614[电气工程—电力系统及自动化]