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电器中流动的高频电流（噪声电流）测量放电发生频率（脱离率）的新方法。对于不接触弧的主题，获得了以下结果。该原理是基于在VHF频带中的单个频率处的带通滤波器（BPF）对流过受电弓的噪声电流的最大响应之间的时间间隔的连续测量，因为该时间间隔大致对应于电弧或非电弧的持续时间。计算机计算表明，在采用高斯带通滤波器的情况下，上述方法可以估计出脱离率。推导了理论公式，粗略估算了脱离率。为了验证理论的正确性和方法的有效性，计算结果与理论结果进行了比较。在非GA的情况下， ...更多信息 对常用的高斯带通滤波器进行了计算机计算，结果表明该方法给出了测量误差。为了减小这种误差，提出了利用滤波器响应包络线采样数据的算法。提出了一种不需要电弧电压和受流系统电路参数等先验信息，利用统计检验进行估计的新方法。为了从实验上证实所得到的结果，利用个人计算机构造了频谱分析设备。通过测量重复脉冲和伪随机脉冲的占空比来检查操作。采用模拟集流体的滑动接触装置进行实验。结果表明，虽然在滑动触头上没有出现短弧的情况下，该方法的有效性得到了验证，但在出现短弧的情况下，该方法的估计误差较大，这是由于BPF响应的重叠和采样数据上叠加的噪声造成的。目前，我们一直在研究另一种估计方法的脱离率使用特定的电流波动在电弧放电。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