考虑脉冲信号传输特性的矿用电缆故障定位方法

Mine-used cable fault location method considering transmission characteristics of pulse signal

为解决电缆分接头对脉冲信号的反射干扰造成故障定位困难的问题,分析了脉冲信号沿电缆传输特性:脉冲信号幅值、脉宽随传输距离的增加呈单调线性变化。在此基础上提出了一种考虑脉冲信号传输特性的矿用电缆故障定位方法:通过向电缆中注入原始脉冲信号获得反射脉冲信号,根据反射脉冲信号的脉宽、幅值变化识别电缆故障点反射脉冲信号,从而排除电缆分接头反射脉冲信号的干扰,实现故障准确定位。搭建了矿用电缆故障定位仿真模型对该方法进行验证,仿真结果表明,该方法具有较高的故障定位精度,定位误差小于1%。

In view of difficulty in fault location due to reflection interference of cable tap on pulse signal,transmission characteristics of pulse signal along cable were analyzed,that is,amplitude and pulse width of pulse signal changed linearly with the increase of transmission distance.On this basis,a fault location method of mine-used cable considering transmission characteristics of pulse signal was proposed.Reflected pulse signal is obtained by injecting original pulse signal into cable,and reflected pulse signal from cable fault point is identified according to variation of pulse width and amplitude of the reflected pulse signal,so as to eliminate interference of the reflected pulse signal from cable tap and realize accurate fault location.A mine-used cable fault location simulation model was built.The simulation result show that the method has high fault location accuracy and location error is less than 1%.