摘要
以直线式碳刷/供电轨交流滑触供电装置为研究对象,建立了刷轨电接触的电传导电路模型,设计了等效的高速旋转式交流刷轨电接触试验系统.对刷轨电接触特性进行了试验和理论分析,总结了电流幅值、电流频率、滑动速度和电弧长度对刷轨接触电阻和接触电抗的影响规律.结果表明:刷轨交流电接触系统整体呈阻感负载特性,接触电容的作用明显小于体电感的作用;刷轨接触电阻关于电流幅值负相关、关于滑动速度正相关,接触电抗关于电流幅值正相关,但基本不受滑动速度的影响;在刷轨电接触发生起弧现象后,其接触电阻随电弧长度的增加而大幅增大,而接触电抗呈缓慢下降趋势;接触电阻随电流频率的增加而增加,由于电流频率较低,电流频率对刷轨体电阻的影响明显高于对接触收缩电阻的影响.
Taking the linear carbon brush/power rail alternating current(AC)sliding contact power supply device as the research object,the electric conduction circuit model of the brush-rail electric contact was built,and the equivalent high-speed rotation AC brush-rail electric contact test system was designed.The characteristics of brush-rail electric contact were analyzed through the experimental and theoretical analysis,and the effects of current amplitude,current frequency,sliding speed and arc length on the contact impedance of brush-rail were summarized.Results show that the brush-rail AC electrical contact system has resistance and inductance characteristics,and the effect of contact capacitance is obviously less than that of bulk inductance.The brush-rail contact resistance is negatively related to the current amplitude and positively related to the sliding speed,and the contact reactance is positively related to the current amplitude,but virtually independent of sliding speed.The contact resistance increases with arc length increasing when arcing occurs,while the contact reactance decreases slowly.The contact resistance increases with current frequency increasing,and the influence of current frequency on the brush-rail bulk resistance is significantly greater than that on the contact constriction resistance due to the low frequency of current.
作者
吴延好
许金
李想
王君珺
WU Yanhao;XU Jin;LI Xiang;WANG Junjun(National Key Laboratory of Science and Technology on Vessel Integrated Power System,Naval University of Engineering,Wuhan 430032,China;Major Project Management Center of Naval Equipment Department,Beijing 100841,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第5期66-72,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51977218,52077218).
关键词
碳刷
供电轨
滑动电接触
接触电阻
接触电抗
carbon brush
power rail
sliding electrical contact
contact resistance
contact reactance
