【作者】 杨波；

【导师】 杨世武；

【作者基本信息】 北京交通大学 ， 交通信息工程及控制， 2014， 硕士

【摘要】 近年来,我国电气化铁路的大力发展,特别在高速和重载铁路中得到应用。然而,高速和重载铁路与既有线路相比,牵引电流更大,牵引功率更高,必然带来钢轨电位升高和牵引回流增大这两个突出问题。高速和重载铁路引入综合接地系统后,牵引回流分布以及对信号系统电磁干扰的量化分析尚未有系统研究。本论文以此为背景,面向大秦线重载铁路牵引回流分布及牵引电流传导性强电磁干扰对轨道电路和信号电缆等室外信号设备的影响机理及干扰数值进行研究,主要工作包括以下四个方面。首先,根据大秦线牵引供电系统牵引网导线配置及结构设置,运用现有理论阻抗计算方法对其阻抗参数进行了具体求解,为仿真计算提供基础数据支持。第二,推导了单线AT供电方式下钢轨电流和电位的连续数学模型,以此为据,验证了系统节点数学模型的准确性并分析了二者的适用性。对钢轨电位的影响因素进行了仿真验证,并且就贯通地线的参数对钢轨电位电流的影响作了详细分析研究。第三,对大秦线全并联复线进行了节点模型的建立,从而运用MATLAB求出了无桥梁区段、有桥梁区段以及桥梁地线发生断线情况下,钢轨电位电流,保护线和贯通地线电位电流及信号电缆双端接地时传导性电流的大小,得出各回流路径中牵引回流大小的分配比例,结合现场测试验证了理论仿真的准确性。最后,分析了系统中电气横联对轨道电路可能造成的迂回回路,对双端接地下电缆芯线电磁干扰进行了定量计算,为信号电缆接地评估提供可靠数据。得出信号电缆双端接地与单端接地相比,抗干扰效果不显著的结论。更多还原

【Abstract】 In recent years, the strong development of China’s electrified railway, especially had been applied in high-speed and heavy haul railway. However, the traction current and traction power of high-speed and heavy rail were larger than the existing lines, then rail potential and traction return were much increased. After the introduction of integrated grounding system, traction return distribution and quantitative analysis of electromagnetic interference on signal system had not been systematically studied. Against this background, this paper researches traction return current distribution and strong conductivity electromagnetic interference on track circuit and signal cables for Datong-Qinhuangdao heavy haul railway, major work focuses the following four aspects.At first, according to wire configurations and structure settings of Datong-Qinhuangdao Railway Traction Power Supply System, its specific impedance parameters were solved by existing impedance theoretical calculations, providing basic data support for subsequent simulation.Secondly, continuous mathematical model of rail current and potential under single-line AT power supply was deduced, the accuracy of system node model was verified and the applicability of both were analyzed. The factors that affecting rail potential were simulated and the impact of ground parameters on rail current and potential were detailed analyzed.Thirdly, node model of Datong-Qinhuangdao full parallel double-track line was established, current and potential of rail, protective wire, ground and conductive current of signal cables under double-grounded were determined in case of no bridge sections, bridge sections and ground disconnection, current distribution ratio was obtained and the theoretical simulation accuracy was verified combined with field testing.Finally, track circuit detour caused by electrical system cross-linking was analyzed, electromagnetic interference on cable core was calculated, it provided reliable data for the evaluation of signal cable grounding. The conclusion was that interference effect was not significant while signal cable double-grounded compared with single-grounded.更多还原