Study on a Method for Measuring Discontact Discharge Occurrence Frequencies in High Speed Liding Current Collecting System Using Impulisive Noise Currents

本研究的目的是提供一种利用滑动集流器中的高频电流（噪声电流）测量放电发生频率（接触率）的新方法。对于接触电弧的对象，得到了以下结果。该原理是基于连续测量VHF频段单频带通滤波器（BPF）对流过受电弓的噪声电流的最大响应之间的时间间隔，因为该间隔近似对应于电弧或非电弧的持续时间。在使用高斯BPF的情况下，计算机计算表明，上述方法可以估计出接触率。推导了理论方程，粗略地估计了接触速率。为了验证本文方法的理论正确性和有效性，将计算结果与理论结果进行了比较。在非遗传算法的情况下，计算机计算表明，该方法给出了测量误差。为了减少这种误差，提出了一些利用从滤波器响应包络中采样数据的算法。提出了一种不需要电弧电压和电流采集系统电路参数等先验信息的统计检验方法。为了对所得结果进行实验验证，利用个人计算机搭建了光谱分析设备。通过测量循环脉冲和伪随机脉冲的占空比来检查操作。实验采用模拟集流器的滑动触点装置进行。研究发现，虽然在滑动触点上没有出现短弧的情况下，验证了该方法的有效性，但在出现短弧的情况下，该方法给出了很大的估计误差，而且这是由于BPF的重叠响应和叠加在采样数据上的噪声造成的。目前，我们正在研究另一种利用电弧放电时的比电流波动来估计接触率的方法。少

The purpose of this study is to offer a new method for measuring the discharge occurrence frequency ( discontact rate) using the high frequency currents ( noise currents ) flowing in the sliding current collector. The following results are obtained for the subject of the discontact arcs. The principle is based upon the successive measurement of the time interval between the maximum responses of the band-pass-filter (BPF) at the single frequency in the VHF band to noise currents flowing through the pantograph, since this interval approximately corresponds to the duratio of the arc or the non-arc. In the case where the gaussian BPF is used, the computer computation shows that the above method can estimate the discontact rate. The theoretical equation is derived to roughly estimate the discontact rate. For confirming the theoretical validity and the effectiveness of the method presented here, comparison is made between the computation and the theoretical results. In the case of the non-ga … More ussian BPF commonlyused, the computer computation shows that this method gives the measurement error. For reducing this error, some algorithms are presented by using the data sampled from the envelopes of the filter response. A new estimation method is also presented by using a statistical test, which requires no apriori informations such as the arc voltage and the circuit parameters of the current collecting system. For experimentally confirming the results obtained, the spectrum analyzingequipment is constructed by using a personal computer. The operation is checked by measuring the duty ratios of the recurrent pulses and the pseudo-random pulses. The experiment is performed by using the sliding contact apparatus simulating the current collector. It is found that although in the case where the short arcs do not occur across the sliding contacts the validity of this method is verified, in the case where the short arcs appear the method gives the large estimation error and also that this results from the overlapped responses of the BPF and the noises superimposed on the sampled data. At present, we have been investigating an another estimation method of the discontact rate using the specific current fluctuation during the arc discharge. Less