基于短时互相关的低压脉冲法电缆故障定位

Cable Fault Location Using Low Voltage Impulse Method Based on Short -time Cross -correlation

摘要:

为了提升传统低压脉冲法的电缆故障定位能力，文中提出基于短时互相关的低压脉冲法电缆故障定位方法。首先，对电缆开展低压脉冲测试得到相应的测试波形；然后，根据输入波形设置短时参考信号，将短时参考信号进行时移后与测试波形计算互相关系数；最后，根据绝对互相关系数序列曲线的峰值位置来定位电缆故障。仿真和实测结果表明，所提方法可以有效提升低压脉冲法中反射信息的识别能力，提高低压脉冲法对电缆故障的定位能力。

Abstract:

In order to improve the cable fault location ability of the traditional low voltage impulse method, the low voltage impulse method based on short -time cross -correlation is proposed to locate the cable fault. Firstly, the low voltage impulse test is carried out on the cable to get the corresponding test waveform. Then, the short -time reference signal is obtained according to the input signal waveform, and the cross -correlation coefficients of time -shifted short -time reference signal between the test waveform are calculated. Finally, the cable fault is located according to the peak position of sequence curve of the absolute cross -correlation coefficients. The simulation and measurement results show that the proposed method can effectively improve the recognition ability of the reflected information and the location ability of cable fault.