【作者】 李伟华；

【导师】 何正友；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2006， 硕士

【摘要】 自闭/贯通线路肩负着为铁路沿线自动闭塞信号及车站负荷等提供电源的艰巨任务,一旦发生故障会影响铁路正常运输,严重时将会造成重大生命财产损失。因此对自闭/贯通线路供电可靠性的要求非常高。而自闭/贯通线路受其使用环境的影响又极易发生故障,且故障查找、维修极其不便,这样对故障点的及时、准确定位就显得特别重要。现有方法及产品由于误差较大,远不能满足线路实际运行的需要。 本文正是基于这种背景,针对自闭/贯通线路及故障特点,在分析和比较现有几种典型故障定位方法适应性的基础上,给出了基于“S注入法”的改进方案,即将其与无线通信网络技术相结合,进行自闭/贯通线路故障的测距与定位。 建立了基于MATLAB/SIMULINK的自闭/贯通线仿真模型,详细分析并给出了各模块参数的计算及设置原则,在此基础上仿真确定了信号源容量及信号频率范围,研究了“S注入法”所注特定信号在系统各因素下的变化规律,首次系统分析了不同结构线路模型、不同故障工况下“S注入法”的适应性情况,得出了信号电流分布主要受系统容性、感性及过渡电阻影响的结论,表明过渡电阻较低时能用于几乎所有结构形式的线路中进行定位,较高时仍可用于架空线及经消弧线圈接地系统,且可通过增大信号源功率或停电注入增强其适应性,证明了“S注入法”在自闭/贯通线故障定位中的确具有较强适应性。 给出了一种基于注入法的自闭/贯通线单相接地故障定位系统方案,将相间短路故障定位嵌入设计组成了更完善的自闭/贯通线故障定位系统,介绍了其组成及工作原理,并将理论和仿真相结合,研究与解决了系统中的相间短路故障识别、节电供电方式及系统通信网络等几个关键技术问题,为后续系统装置的研制提供了理论依据。 本论文所做的工作,可对铁路自闭/贯通线路的故障测距定位技术的发展提供帮助与借鉴,具有一定的理论价值和实际意义。更多还原

【Abstract】 Railway automatic blocking and continuous transmission lines (RABCTL) supply power for the railway automatic blocking signal and the loads along the lines, etc. In order to insure transportation safety, high reliability of the power supply system and quick elimination of fault is required. A slight fault could affect normal railway transportation;even cause serious life and property loss. So in order to avoid accidents, and to make the distribution network run safely, reliably and economically, fault must be located and be eliminated as quickly as possible. However, the existing methods and products which are high in error can’t meet the needs of actual operation.On base of the analysis and compare of several typical fault location methods’ adaptability, and considering the condition mentioned above and the character of both RABCTL and faults, an advanced S-injection method is put forwarded in this paper that is combining it with wireless-node communication network to locate its fault.The model of RABCTL based on MATLAB/SIMULINK is built, and calculating and setting laws of each module are analyzed detailedly, and the signal source capacitance and frequency range are set by simulation in this paper. On condition of those, hard work has been put into the research of changing laws of which the injected signal effected by system, and the adaptability of "S-injection method" used in different model and condition at the first time. It brings out a conclusion that signal current distribution is effected by system capacitance, inductance and resistance. This conclusion suggests that "S-injection method" would be used in all lines when resistance is low as in aerial wire when resistance is high, and its adaptability could enhance by using high signal source power and injecting signal whenpower is cut. Result of simulation shows "S-injection method" is adaptable in RABCTL fault location.A fault location method of single phase-to-ground based on S-injection is represented, and constitutes a new fault location system with another one which concerns about phase-to-phase short fault. The system’ constituents and fundamental are introduced. Based on the theory and simulations, some key techniques, such as signal source, phase-to-phase short fault recognition, node power supply, and system communication network, are solved. This could be a theory basis for further research.Work done in this paper will contribute the development of RABCL fault location, both in theory and practice.更多还原