接地方式对高速动车组升弓浪涌过电压的影响  

Influence of Grounding Mode on Surge Overvoltage Caused by Pantograph Raising in High-speed EMU

作　　者：万玉苏 刘耀银 高国强[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《铁道学报》2017年第12期32-37,共6页Journal of the China Railway Society

基　　金：国家自然科学基金(U1234202)

摘　　要：随着高速动车组接地方式的改变,车体升弓浪涌过电压也不相同。本文为分析接地方式对高速动车组升弓浪涌过电压的影响,基于某型动车组接地方式,构建高速列车升弓等效电路模型,在此基础上分析升弓浪涌过电压的产生机理、分布特性,并将现场测试数据与仿真结果进行对比;仿真分析不同接地方式对升弓浪涌过电压的影响。结果表明,高速动车组升弓时,最高车体浪涌过电压幅值达到4.95kV,并在20μs内迅速衰减;采用直接接地方式最高升弓浪涌过电压幅值减小为2.4kV;在接地电阻器两侧并联电容也可有效降低过电压幅值,过电压幅值与并联电容值有关,电容值取10μF时较为合适,此时过电压最小降低为2kV。以上结论可为研究接地方式对于车体升弓浪涌过电压的影响提供理论基础。The values of car-body surge overvoltage vary with the change of the grounding modes in the process of pantograph raising.In order to analyze the influence of grounding modes on surge overvoltage caused by pantograph raising,firstly,based on the grounding mode of a certain type of EMU,the equivalent circuit model ofpantograph raising was built to study the generation mechanism and distribution characteristics of the surge overvoltage caused by pantograph raising.Then,the field test data and the simulation results were compared.Through simulation,the impact of different grounding modes on the surge overvoltage during pantograph raisingwas analyzed.The results show that the maximum over-voltage amplitude reaches 4.95 kV and rapidly attenuates in the 20μs when the pantograph of high-speed EMU is lifted.With the direct earthing mode,the maximum surge overvoltage amplitudeis reduced to 2.4 kV.The overvoltage amplitude can be effectively reduced when the grounding resistors are connected in parallel with capacitors.The amplitude of overvoltage is related to the vaule of the parallel capacitance,taking 10μF as optimal capacitance vaule at which,the vaule of overvoltage will decrease to 2 kV.The conclusions provide a theoretical basis for studying the influence of grounding mode on surge overvoltage caused by pantograph raising of high-speed EMU.

关 键 词：高速动车组 接地方式 升弓 车体浪涌过电压 

分 类 号：U223[交通运输工程—道路与铁道工程]