摘要
电力机车高速运行时,接触电流、压力波动和机车的运行速度均会影响弓网间的可靠接触。通过浸金属碳滑板与铜导线的对磨实验,得到接触电阻随接触电流、滑动速度、压力波动幅度和压力波动频率变化的特性规律。采用极限学习机(ELM)建立接触电阻与接触电流、滑动速度、压力波动幅度、压力波动频率的预测模型;综合考虑接触电阻和电流稳定系数,提出弓网滑动电接触失效判据。分析得出弓网接触失效机理:接触压力波动幅度和滑动速度增大使得弓网间摩擦振动加剧,接触电阻增大超过临界值,接触失效。在此基础上根据接触电阻概率分布建立失效概率模型,最后分析给出一定工况条件下弓网滑动电接触的失效概率。
When the electric locomotive runs at a high speed,the contact reliability between the pantograph and catenary is affected by the contact current,pressure fluctuation and speed of locomotive.Through the mutual-grinding test of metal-impregnated carbon slide and copper wire,the characteristics of contact resistance changing with the contact current,sliding speed,pressure fluctuation amplitude and pressure fluctuation frequency are obtained.The prediction model of contact resistance changing with contact current,sliding speed,pressure fluctuation amplitude and pressure fluctuation frequency is established using the extreme learning machine(ELM).The contact resistance and current stability coefficient are considered comprehensively to propose the failure criterion of pantograph-catenary sliding electrical contact.The mechanism of contact failure of the pantograph-catenary is analyzed.The increasing of the amplitude of contact pressure fluctuation and sliding speed makes the friction vibration between the pantograph and catenary more serious.As a result,the contact resistance increases beyond the critical value,which causes the contact failure.Based on above theory,the model of failure probability is established according to the probability distribution of contact resistance.Finally,the failure probability of sliding electrical contact of the pantograph-catenary under certain working conditions is given.
作者
陈忠华
吴迪
回立川
宋宇宁
平宇
Chen Zhonghua;Wu Di;Hui Lichuan;Song Yuning;Ping Yu(Faculty of Electrical and Control Engineering Liaoning Technical University,Huludao 125105 China;Department of Mechanical and Power Engineering Yingkou Institute of Technology,Yingkou 115014 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第21期4492-4500,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金（51477071）
辽宁省教育厅基金青年项目（LJ2017QL009）资助
关键词
弓网系统
滑动电接触
接触失效
失效概率模型
Pantograph-catenary system
sliding electric contact
contact failure
failure probability model
