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本文利用传输线理论分析了无绝缘轨道电路补偿电容故障对轨道电路短路电流幅度包络的影响,提出了短路电流幅度包络的回归模型,并利用Levenberg-Marquardt(L-M)算法验证了该模型的正确性和适用性.根据机车信号的工作原理,将对短路电流幅度包络的检测转换为对机车信号感应电压幅度包络的检测.在利用L-M算法进行分段指数拟合以去除信号的衰减趋势的基础上,通过广义S变换(GST)得到信号的瞬时频率变化,最终根据短路电流幅度包络的回归模型,对瞬时频率变化结果进行判决,得到发生故障电容的具体位置.实验表明,GST具有较高的时–频分辨率,可以此对故障电容进行准确定位.由于该方法的检测数据全部来自于机车信号的日常运用,使得利用本文方法可大大缩短补偿电容的检测间隔时间,在很大程度上克服了目前检测方法在检测的及时性、成本和影响铁路运输等方面的不足.
In this paper, the transmission line theory is used to analyze the influence of compensation capacitor failure of uninsulated track circuit on the amplitude envelope of short circuit current. The regression model of short circuit current amplitude envelope is proposed and the model is verified by the Levenberg-Marquardt (LM) algorithm According to the working principle of locomotive signals, the detection of the amplitude envelope of short-circuit current is converted into the detection of the amplitude envelope of the induced voltage amplitude of the locomotive signal.Using LM algorithm to segment the exponential fitting to remove the decay tendency of the signal , The instantaneous frequency change of the signal is obtained by the generalized S transform (GST), and finally the instantaneous frequency change result is judged according to the regression model of the short-circuit current amplitude envelope to obtain the specific location of the fault capacitor.The experiment shows that GST has High time-frequency resolution, which can accurately locate the fault capacitor.As the detection data from the method of locomotive daily use of all, making use of this method can greatly reduce the compensation capacitor detection interval, in a very large To the extent to overcome the current testing methods in testing the timeliness, cost and impact of rail transport Inadequate surface.