摘要
内部渗水是常见的电缆故障之一,电缆内部渗水缺陷的准确检测、识别及定位对于提高电力安全稳定具有至关重要的作用。本文在时域反射技术(TDR)理论的基础上,通过仿真分析了注入脉冲频率及幅值衰减对TDR有效定位距离的影响,获得了不同阻抗点特征波形,总结了渗水缺陷波形的分辨方法,并研究了复反射波对定位精度的影响。结果表明:TDR技术可检测电缆内部的渗水缺陷,有效检测距离约为3.76 km;不同类型缺陷会返回不同的特征波形,当渗水程度不同时,其波形幅值和波尾振荡也会改变。
Internal water seepage is one of the common faults of cable.The accurate detection,identification,and location of internal water seepage defect in cable play a vital role in improving power safety and stability.On the basis of time-domain reflection technology(TDR)theory,the effects of injection pulse frequency and amplitude attenuation on the effective positioning distance of TDR were analyzed by simulation.The characteristic waveforms of different impedance points were obtained,the resolution method of water seepage defect waveforms was summarized,and the effect of complex reflection wave on the positioning accuracy was studied.The results show that the TDR technology can detect the water seepage defect in cable,and the effective detection distance is about 3.76 km.Different types of defects will return different characteristic waveforms,and when the degree of water seepage is different,the waveform amplitude and wave tail oscillation will also change.
作者
任志刚
赵雪骞
郭卫
陈平
周松霖
方春华
REN Zhigang;ZHAO Xueqian;GUO Wei;CHEN Ping;ZHOU Songlin;FANG Chunhua(State Grid Beijing Electric Power Research Institute,Beijing 100075,China;College of Electricity and New Energy,China Three Gorges University,Yichang 430002,China)
出处
《绝缘材料》
CAS
北大核心
2022年第1期80-86,共7页
Insulating Materials
基金
国家自然科学基金青年基金资助项目(51807110)。
关键词
电力电缆
渗水缺陷
时域反射
power cable
seepage defect
time domain reflection
