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

作　　者：周涛 万子逸 段永生 吴辰阳 钱琪 ZHOU Tao;WAN Ziyi;DUAN Yongsheng;WU Chenyang;QIAN Qi(Kunming Power Supply Bureau,Yunnan Power Grid Co.,Ltd.,Kunming 650200,Yunnan,China)

机构地区：[1]云南电网有限责任公司昆明供电局,云南昆明650200

出　　处：《四川电力技术》2023年第1期54-58,共5页Sichuan Electric Power Technology

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。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.

关 键 词：电缆 故障定位 短时互相关 低压脉冲法 

分 类 号：TM935[电气工程—电力电子与电力传动]