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作 者:杨国栋 YANG Guodong
机构地区:[1]中国铁路南宁局集团有限公司桂林高铁基础设施段
出 处:《电气化铁道》2022年第6期26-32,39,共8页Electric Railway
摘 要:现阶段应用于牵引供电故障测距的定位系统大部分采用阻抗法测距,阻抗法故障测距受系统运行方式、故障时系统初相角及故障过渡阻抗的影响,而采用行波法故障测距原理可避免此类问题。本文提出一种基于行波的故障测距方法,采用非接触式故障测距的手段进行牵引供电故障测距,通过空间电磁场的变化,设计出具有非接触式耦合感应的传感器,该传感器具有相应频带宽、输出线性且不失真的特性,从而实现了牵引供电系统的信号测量。对于行波信号的解析,采用小波变换进行故障分析,通过多次试验对比得到最终的小波变换尺度函数以及小波分解的层数,最终应用于牵引供电系统的故障精确定位,通过多次现场故障定位测试结果表明,非接触式故障精确定位系统具有良好的优越性和稳定性。At present,most of the locating systems applied for location of faults occurred in traction power supply adopt impedance method for the fault location.The impedance method for fault location is affected by the system operation mode and the initial phase angle of the system when the fault occurs as well as the fault transition impedance.However,the traveling wave method for fault location can avoid such problems.The paper proposes a fault location method based on traveling wave.The non-contact fault location method is used for fault location of traction power supply.Through the change of space electromagnetic field,a sensor with non-contact coupling induction is designed.The sensor has the characteristics of wide frequency band,linear output and no distortion,thus realizing the signal measurement of traction power supply system.For the analysis of traveling wave signal,wavelet transform is used for fault analysis,and the final wavelet transform scale function and wavelet decomposition level are obtained through multiple tests and comparisons.The system is finally applied to the accurate fault location of traction power supply system.The results of multiple on-site fault location tests show that the non-contact accurate fault location system has good advantages and stability.
关 键 词:非接触式传感器 电磁感应特性 行波法故障定位 小波分解
分 类 号:U226.8[交通运输工程—道路与铁道工程]
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