铁路隧道电分相结构参数与中性线过电压研究  

Research on Structure Parameter of Phase Insulator in Railway Tunnel and Over-voltage of Neutral Line

作　　者：郑景文 刘明光[1] 崔玮辰 彭伟 黄文勋 王强 ZHENG Jingwen;LIU Mingguang;CUI Weichen;PENG Wei;HUANG Wenxun;WANG Qiang(College of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory of Rail Transit Engineering Informatization(FSDI),Xian 710043,China)

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]轨道交通工程信息化国家重点实验室(中铁一院),西安710043

出　　处：《铁道标准设计》2020年第9期146-150,共5页Railway Standard Design

摘　　要：动车组通过电分相时产生的冲击过电压可能危及接触网绝缘和安全运行,设计中对此十分重视,往往要反复计算和进行方案比较,动车组过分相过电压受电分相结构及其感应电压影响较大。针对隧道内电分相结构的等值电容参数计算,利用镜像法推导其计算公式,计算中性线的等值电容和感应电压,仿真动车组通过电分相的过电压,并与无隧道情况进行比较。结果表明,计入隧道影响时的中性线对地电容为11.21 pF/m,比不计隧道增加61.57%,互电容为11.269 pF/m,比不计隧道减小15.11%;中性线过电压比不计隧道增大30%~40%。隧道中电分相结构设计和运行,应高度重视动车组过分相的过电压升高,并采取必要的防护措施。The shock over-voltage produced by the EMU passing the phase insulator may endanger the insulation and safe operation of the catenary.The over-voltage of the EMU passing the phase insulator is greatly affected by phase insulator structure and its induced voltage.Aiming at the calculation of equivalent capacitance parameters of the phase insulator structure in tunnels,this paper deduces the calculation formula by image method,calculates the equivalent capacitance and induction voltage of the neutral line,simulates the over-voltage of EMU passing phase insulator,and compares it with the situation without tunnel.The results show that when the influence of the tunnel is taken into account,the ground capacitance of the neutral line is about 11.21 pF/m,which is 61.6%higher than that without tunnel.The mutual capacitance of the neutral line is about 11.269 pF/m,which is 15.1%lower than that without tunnel.The over-voltage of the neutral line increases by 30%to 40%without tunnel.The design and operation of the phase insulator structure in tunnels should pay great attention to the overvoltage rise of EMU passing phase insulator,and necessary protective measures should be taken.

关 键 词：电气化铁道 铁路隧道 接触网 电分相 中性线 等值电容 过电压 

分 类 号：U225.4[交通运输工程—道路与铁道工程]