【作者】 柳长源；

【导师】 姜德谭；

【作者基本信息】 哈尔滨理工大学 ， 电力电子与电力传动， 2005， 硕士

【摘要】 安全是铁路运输的生命线。为了使列车运行直接与信号设备发生关系,通常是把钢轨作为信号传输线。在电气化铁路区段,两条钢轨既是移频信号的传输线又是机车牵引电流的回流线。工频牵引电流会对移频信号带来极大的干扰。定期检测轨道电路的电压、频率等参数,以判断轨道电路及其信号设备是否处于最佳工作状态,可以及时消除隐患,确保铁路安全行车。 本课题研究内容:在不要点,不开天窗,不中断行车,不中断被测区段牵引电流的情况下,在线、动态、实时测量电化区段和非电化区段的移频轨道电路电压、电流、相位等参数。 本文详细介绍了如何解决在线测试现代电气化铁路移频轨道电路参数的技术难题。 本文采取了信号变换(模拟前处理)的测量方法,包括RC有源、无源陷波电路、RC低通滤波电路、双T滤波网络,开关电容滤波及外差测量法等。 根据移频轨道电路的特点,本文分析了电压、电流在线测量过程中采用的信号采集技术。相位测量采用零交叉整形电路,零点补偿电路以及软件的毛刺剔除技术,解决了测相中的“死角”、“死区”、以及滤波电路所带来的误差。 整个系统采用了8098微处理器作为主控单元。更多还原

【Abstract】 Safety is the life-line of railway transportation. Track circuit signal can ensure railway transport. Rails are used as transmission line to enable train communicate with signal processing equipment. The two rails are not only signal lines of track circuits, but also loop line for locomotive traction current in electrified railway block. Industrial frequency traction current may have significant interference with FSK signal. The electric parameters of track circuit such as current, voltage, phase must be measured periodically to make sure track circuits and signal equipments run normally in order to avoid accident.The content of this theme is as follow: without time, without open, without stopping railway transport, and without interrupting traction current of block tested, track circuit parameters in electrical and no electrical blocks is measured with on-line, dynamic and real-time. These parameters include voltage, current and phase of FSK signal.This paper shows in detail about how to resolve some technical problems for on-line testing circuits parameters in electrical railway.In this paper, signal conversion method (processing before analogue) are used including RC active and on active notching filters, RC low pass filters, double T filters, switched capacitor filters and heterodyne measurement method, etc.According to the characteristics of frequency shift track circuits, this paper has analyzed signal acquisition methods of voltage and current measurement on line. In phase measurement, the instrument used zero-crossing shaping circuit, zero-drift compensation circuit and software burr rejection technique. It has solved problems of dead-zone and filter circuits errors in phase measurement.The whole system has been used 8098 microprocessor as control unit.更多还原