摘要
弓网(PC)电弧带来的电磁干扰会影响到车载数字设备的正常工作。因此,有必要研究弓网电弧的电磁辐射特性。首先,基于ANSOFTHFSS仿真软件建立仿真工程,设计了一种用于监测电弧电磁辐射的4阶Hilbert分形天线。其次,搭建了弓网电磁辐射信号测量实验装置,以铜合金接触导线-纯碳滑板为研究对象,在不同试验电流及不同电极间距下,分别开展多组弓网电弧辐射电磁实验。对采集到的电磁辐射时域脉冲信号进行快速傅立叶变换,提取频谱分布范围及典型频率值。研究结果表明:弓网电弧电磁辐射频段主要分布在0～160 MHz,特别是在0～40、60～100 MHz频段内强度较大。改变试验电流和电极间隙,电弧电磁辐射频谱分布整体相似,且频域峰值都出现在18MHz。通过对电磁辐射的实时监测,可获得电弧发生时刻和持续时间等信息,提供了一种有效的弓网电弧监测方法,有助于对弓网系统受流水平进行评价。
The electromagnetic interference caused by the pantograph-catenary(PC) arc in a high-speed railway system affects the normal operation of vehicle digital equipment. Therefore, it is necessary to study the electromagnetic radiation characteristics of PC arc. Firstly, based on ANSOFT HFSS simulation software, a four-order Hilbert fractal antenna was designed to monitor the electromagnetic radiation. Then, the experimental platform of electromagnetic radiation signal measurement was built, a pair of the copper alloy contact wire-pure carbon strip was used as the research material, and several sets of pantograph arc radiation electromagnetic experiments were carried out under different experimental currents and different electrode gap. Finally,a Fast Fourier Transform was carried out for the electromagnetic radiation time domain pulse signal, and the spectrum distribution range and typical frequency value were extracted. The results show that the electromagnetic frequency spectrum of the PC arc is distributed at 0~160 MHz, especially in 0~40 MHz and 60~100 MHz. By changing the test current, the spectrum distribution of the electromagnetic radiation is similar, and all the peak frequency domain appears at the 18 MHz. Through the monitoring of real-time electromagnetic radiation, we can obtain the information of arc occurrence time and duration, and provide an effective arc monitoring method, which is helpful to evaluate the current-collecting performance of the PC system.
作者
高国强
颜馨
魏文赋
胡怡
吴广宁
GAO Guoqiang;YAN Xin;WEI Wenfu;HU Yi;WU Guangning(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2019年第1期324-329,共6页
High Voltage Engineering
基金
国家自然科学基金(51577158
516071147)
国家杰出青年科学基金(51325704)
中央高校基本科研业务费(2682016CX039)~~
关键词
弓网电弧
电磁辐射
Hilbert分形天线
频谱分析
在线监测
pantograph-catenary arc
electromagnetic radiation
Hilbert fractal antenna
spectrum analysis
on-line monitoring
