摘要
列车移动接地系统通过接地轮对与钢轨间的滚动电接触实现电能的泄放。其中,车载接地系统可分为工作接地与保护接地两种方式。但由于工作接地轮对与保护接地轮对共用钢轨并将其作为泄流渠道,通过工作接地泄放至钢轨的电流易通过周边的保护接地轮对再次回窜至铝合金车体上,从而在车-轨间形成环流,长期存在车-轨环流将导致牵引电机轴承、齿轮箱齿轮电蚀,抬高车体电位,严重影响列车上搭载的乘客与设备的安全。伴随着高速铁路运行速度及牵引功率不断提升,列车牵引电流的不断增加,将导致车-轨环流现象越加严重,亟需对车-轨环流的产生机制、影响因素及抑制措施开展研究。首先调研车-轨环流造成的相关事故,并梳理产生车-轨环流的根本原因。通过调研目前已构建的移动接地系统仿真模型,探究车-轨环流机理与接地回流的动态变化特性,并收集目前已提出的车-轨环流的抑制措施,提出解决问题的思路。
The mobile grounding system of the train realizes the discharge of electric energy through the rolling electrical contact between the grounding wheelset and the rail.Since the working grounding wheelset and the protective grounding wheelset share the rail as a discharge channel,the current discharged to the rail through the working grounding is easy to return to the aluminum alloy train body again through the surrounding protective grounding wheelset,so that a circulation current is formed between the train-rail and the long-term train-rail circulating current will lead to electrical corrosion of traction motor bearings and gearbox gears,and raise the potential of the train body,seriously affecting the safety of pas-sengers and equipment on the train.By firstly investigating the related accidents caused by the train-rail circulating cur-rent,this paper analyzed the key influencing factors of the train-rail circulation current.Secondly,according to the structure of mobile grounding system,the coupling mechanism of train-rail-catenary grounding return was analysed,and by investigating the simulation model of mobile grounding system,the mechanism of train-rail circulation current and the dynamic change characteristics and distribution law of grounding current were explored.At last the measurements to sup-press the train-rail circulating current from three aspects:current,voltage,and impedance and proposed solutions to the problem.Based on current technological means,an online adaptive adjustable resistor was proposed to cope with different grounding conditions.
作者
肖嵩
王梓靖
吴广宁
郭裕钧
张血琴
高国强
XIAO Song;WANG Zijing;WU Guangning;GUO Yujun;ZHANG Xueqin;GAO Guoqiang(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2024年第9期57-68,共12页
Journal of the China Railway Society
基金
国家自然科学基金(U19A20105,52277166)。
关键词
高速列车
移动接地回流系统
电能泄放
车-轨环流
动态变化特性
high-speed train
mobile ground return current system
electric energy discharge
train-rail circulating cur-rent
dynamic characteristics
作者简介
第一作者:肖嵩(1986一),男,四川成都人,教授,博士。E-mail:xiaosong@home.swjtu.edu.cn;通信作者:吴广宁(1969一),男,江苏南京人,教授,博士。E-mail:gnwu@swjtu.cn。
