摘要
以重载铁路的信号电缆烧损故障为研究背景,研究AT供电方式和贯通地线的条件下牵引电流在信号电缆中的分布以及桥梁因素对其影响。首先,利用连续性微分方程和离散的节点方程对钢轨电流进行仿真计算和对比,并对重载条件下牵引电流分布模型中的关键阻抗参数进行计算。然后,建立AT供电方式和贯通地线条件下复线铁路全并联牵引供电系统的节点模型,给出不同牵引回流路径中的电流分配比例。研究桥梁因素对电流分配的影响,得出信号电缆双端接地时电缆外铠装和护套中的传导性电流。现场实际测试结果证明,实际电流分配与仿真结果基本一致。本综合模型可为分析牵引电流对电缆产生干扰的机理提供参考。
The magnitudes and distributions of traction currents in signal cables were analyzed with regard to China heavy-haul railways with AT power supply and integrated grounding,especially in bridge sections.At first,simulation of rail currents was made by the continuous differential equation and the discrete node model respectively and their results were compared,and the key impedance parameters of the traction current distribution model were calculated for the Heavy-haul condition.Then,the unified node model of the full parallel double-track power supply system with AT supply and integrated grounding was established,and the proportions of currents in different return paths were given.Further,the influence of the factor of bridge on distribution of currents was studied,particularly the conductive currents in external armoured shields and sheaths of signal cables double-end grounded.Finally,by comparison the actual field test results were proved basically identical to theoretical simulation results.The proposed unified model provides reference to in-depth analysis on the mechanism of traction currents interfering signal cables.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2014年第5期19-27,共9页
Journal of the China Railway Society
基金
铁道部科技研究开发计划(2011X016-C)
郑州铁路局科学技术发展计划(2010D8)
