【作者】 赵晓微；

【导师】 唐巍；

【作者基本信息】 中国农业大学 ， 农业电气化与自动化， 2005， 硕士

【摘要】 铁路10kV自闭/贯通线路故障迅速、准确的定位,能够提高供电可靠性,对铁路电力系统的安全稳定和经济运行都有十分重要的作用。 本文分析了故障暂态行波的产生机理和模分量在时域、频域的传播特性,研究了铁路自闭/贯通线路的结构特点以及目前各种故障测距原理,提出了利用线路侧电压互感器提取暂态行波双端故障测距的新方法,该方法能够精确地测量各种类型的故障距离。采用电磁仿真软件ATP-EMTP针对10kV贯通线路的故障暂态行波进行了仿真试验。设计了基于全球定位系统(GPS)的时间同步电路,使测距系统具有双端和单端两类行波测距原理。 完成了现场人工接地试验,行波测距装置捕捉到故障产生的暂态电压行波信号及其到达线路两端的时刻,给出了故障距离,验证了所提出的测距方法的正确性。根据试验结果讨论了实际应用中行波测距误差产生的原因,提出了减小测距误差的措施,从而进一步提高了双端测距的精度。更多还原

【Abstract】 Fast and accurate fault location of 10kV railway Automatic Blocking/Power Continuous Lines can enhance reliability of power supply and play an important role to the safety and economic running of railway power system.The origin of travelling wave and its propagation characteristics of modal components in time-domain and frequency domain are analyzed. The characteristics of configuration of railway Automatic Blocking/Power Continuous Lines and principle of various methods of travelling wave fault location are studied. Using transient surges extracted by transform voltage on the lines, a new method of double-ended principle of fault location is proposed. It can detect different kinds of faults correctly. Simulation of travelling wave of lOkV railroad Power Continuous Lines had done using ATP-EMTP. And time synchronization circuit based on GPS is designed. The system has the principle of both double-ended and single-ended fault location.An experiment caused by grounding fault initiated artificially is carried out. Travelling wave fault locator captures voltage signal and arriving time of travelling wave. And the distance of fault is given. Correction of the proposed method is proved. According to the experiment result, the reasons which produce the errors in practice application are analyzed, measures of reducing error are taken. And therefore a precise double-ended fault location is realized.更多还原