南方电网技术2023，Vol.17Issue(12)：18-27,10.DOI:10.13648/j.cnki.issn1674-0629.2023.12.003
基于TFDR波形时域包络线的电缆故障定位技术
Cable Fault Location Technology Based on TFDR Waveform Time-Domain Envelope
摘要
Abstract
The traditional time-domain reflection method is only applicable to more serious defects or faults because of its low content of high-frequency components,large signal attenuation in the transmission process in the cable,and the inability to compensate for the signal dispersion attenuation.It can not detect local weak defects well,and its positioning accuracy is low.Based on this,according to the characteristics of the reference signal,this paper proposes a positioning technology based on the waveform time-domain envelope.First,the reference signal and its reflected signal are enveloped by Hilbert transform in the time domain,then the envelope curve is logarithmized and normalized,and finally the eighth order Butterworth band-pass filter is used to filter and suppress noise.After that,50 m and 500 m long power cables are actually tested,respectively.The results show that the time-domain envelope technology can effectively locate cable defects.At the same time,the type of cable defect can also be judged according to the change of time domain waveform.关键词
时频域反射法/参考信号/故障定位/时域包络/小波去噪Key words
time-frequency domain reflection method/reference signal/fault location/time-domain envelope/wavelet denoising分类
信息技术与安全科学引用本文复制引用
吴吉,唐作鑫,彭向阳,王昱皓,于是乎,周凯..基于TFDR波形时域包络线的电缆故障定位技术[J].南方电网技术,2023,17(12):18-27,10.基金项目
国家自然科学基金资助项目(52277156) （52277156）
中国南方电网有限责任公司科技项目(036100KK52200052(GDKJXM20202022)). Supported by the National Natural Science Foundation of China(52277156) （036100KK52200052(GDKJXM20202022）
the Science and Technology Project of China Southern Power Grid Co.,Ltd.(036100KK52200052(GDK JXM20202022)). （036100KK52200052(GDK JXM20202022）
