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随着弓网离线率和离线程度的增加,弓网离线电弧现象频繁发生,而弓网离线电弧对受电弓滑板、接触网导线、供电质量、通讯信号和无线电信号的影响严重危害了列车运行安全。因此基于横向吹弧和纵向吹弧理论,研究了高速气流场对弓网电弧耗散功率的影响。考虑弓网电弧的弧柱拉伸、压缩以及强气流吹弧的能量交换,得到弓网电弧在起弧阶段中,电弧单位长度的耗散功率P与车速vc之间为一次函数关系,且弓网电弧在燃弧阶段中,两者为近似一次函数关系。根据能量平衡理论,运用Matlab/Simulink仿真软件,建立了弓网电弧的动态模型,并对比分析了弓网电弧仿真波形与实验波形。结果表明:第1个燃弧周期内起弧电压峰值约为35 V,第2个燃弧周期内起弧电压峰值约为30 V,且起弧阶段均有小燃弧过程;仿真波形与实测波形在整体趋势上较一致,验证了弓网电弧动态模型搭建的合理性。分析结果为研究弓网电弧特性提供了理论基础。
With the increase of off-line rate and off-line of bow net, off-line arcing of bow net occurs frequently, and the influence of off-line arcing arc on pantograph skateboard, catenary wire, power quality, communication signals and radio signals seriously jeopardizes the train operation Safety. Therefore, based on the theory of lateral blowing and longitudinal blowing, the influence of high-speed airflow on arc power dissipation in bow arc is studied. In consideration of the arc stretching, compression and arc blow energy exchange of bow arc, the arc power dissipation of arc arc length per unit power P is a function of vc in the arcing stage, In the arcing stage, the two arcs have an approximate linear function. According to the theory of energy balance, the dynamic model of bow arc is established by using Matlab / Simulink simulation software, and the bow arc simulation waveforms and experimental waveforms are compared and analyzed. The results show that the peak arcing voltage is about 35 V in the first arcing cycle and about 30 V in the second arcing cycle, and the arcing process has a small arcing process. The simulation waveforms and measured The waveform is more consistent in the overall trend, which verifies the rationality of the arc dynamic model of arch mesh. The analysis results provide a theoretical basis for the study of arcing characteristics of bow network.