轨道交通供电系统电缆故障在线定位技术研究

Research on on-line cable fault location technology of rail transit power supply system

摘要:

在轨道交通供电系统故障中,电缆故障是比较常见的故障,而在传统的电力系统中,电缆故障定位技术主要是通过离线定位来完成故障定位工作,导致电缆故障定位误报率较高。在轨道交通供电系统故障中,电缆故障是比较常见的故障,而在传统的电力系统中,电缆故障定位技术主要是通过离线定位来完成故障定位工作,导致电缆故障定位误报率较高。为此设计新型轨道交通供电系统电缆故障在线定位技术。使用傅里叶变换公式,采集供电系统电压脉冲,并对异常脉冲进行记录。通过异常脉冲分析结果与供电系统导体数据变化,完成电缆故障类别判定。根据电缆故障类别判定结果,采用行波计算法对故障点到电缆端点的距离展开计算,完成电缆故障定位。设定电缆故障定位误差最大值与故障定位技术实现平台,完成高精度电缆故障定位。实验结构表明,通过与传统定位技术以及采用其他方式设计的定位技术相比,此故障定位技术误报率较低。由此可知,此方法的定位能力更佳,使用效果更好。

Abstract:

In the power supply system fault of rail transit, cable fault is a common fault, while in the traditional power system, cable fault location technology mainly completes the fault location work through off-line location, resulting in high false alarm rate of cable fault location. In the power supply system fault of rail transit, cable fault is a common fault, while in the traditional power system, cable fault location technology mainly completes the fault location work through off-line location, resulting in high false alarm rate of cable fault location. For this reason, a new on-line cable fault location technology for rail transit power supply system is designed. Using the formula of Fourier transform, the voltage pulse of power supply system is collected and the abnormal pulse is recorded. According to the abnormal pulse analysis results and the change of the conductor data of the power supply system, the cable fault category is determined. According to the result of cable fault classification, the distance between the fault point and the cable end point is calculated by traveling wave calculation method to complete the cable fault location. Set the maximum value of cable fault location error and the realization platform of fault location technology to complete high-precision cable fault location. The experimental structure shows that the false alarm rate of this fault location technology is lower than that of traditional location technology and other design methods. It can be seen that the positioning ability of this method is better and the use effect is better.