OPGW光缆覆冰监测与纤芯应变分析  

Analysis on Icing and Stress Monitoring for OPGW

作　　者：陈芳 李子凡 李伯中 王颖 邓春雪 田照宇 CHEN Fang;LI Zifan;LI Bozhong;WANG Ying;DENG Chunxue;TIAN Zhaoyu(State Grid Information and Telecommunication Branch,Beijing 100761,China)

机构地区：[1]国家电网有限公司信息通信分公司,北京100761

出　　处：《电力信息与通信技术》2020年第10期48-52,共5页Electric Power Information and Communication Technology

基　　金：国家电网有限公司信息通信分公司2019年公司自建科技项目“光纤智能运维检测系统研究与应用”。

摘　　要：在所有光缆类型中,OPGW光缆自身重量较大,受覆冰影响明显,常常导致因覆冰后应力变化而引起的缆体断裂、金具变形、纤芯受损等故障。文章分析了OPGW覆冰故障特性并提出一种故障定位方法。首先,结合多种光纤传感器在现网场景中的实验数据,将测得的光瑞利散射信号分为同向分量与正交分量,通过小波拟合得到瑞利散射的相位谱分布,最后采用差分算法分析得到相位突变事件的发生位置,实现故障的定位。在现网测算实验中,可直接检测到7 km处的光缆震动信号信噪比约8.5 dB,精准掌握潜在故障发生位置。本研究可以为后续OPGW线路工程技术改造、施工工艺标准提供理论与数据支撑,提升线路覆冰载荷能力。In all types of optical fiber,OPGW often breaks down in the case of icing due to its large weight.The categories of faults include optical fracture,the fittings deformed,cable fitting damaged and so on.In this paper,we aim to study the cable faults by icing and propose a method of fault location.According to the experimental data in real power grid,the parameters of optical fiber such as the stress intensity or transmission efficiency are measured and evaluated through various fiber optical sensors.Firstly,the measured optical Rayleigh scattering signal is divided into the same component and the orthogonal component.Then,the distribution of phase spectrum is obtained by wavelet fitting analyzing method.Finally,the location of the phase mutation event is obtained by using the differential algorithm to locate the fault.The signal-to-noise ratio(SNR)of the optical cable vibration signal at 7 km which is 8.5 dB can be detected directly in the network measurement experiment,so as to accurately grasp the location of the potential fault.And this research can provide theoretical and data support for the subsequent OPGW line engineering technical transformation and construction technology standard,and enhance the line icing load capacity.

关 键 词：光纤传感器 OPGW 覆冰 光缆监测 

分 类 号：TM248[一般工业技术—材料科学与工程]