单档不均匀覆冰分布式光纤传感监测技术  

Distributed optical fiber sensor monitoring technology for single stage uneven ice covering

作　　者：李春生 张睿哲 蔡瀛淼 周恺 李鸿达 迟兴江[2] LI Chun-sheng;Zhang Rui-zhe;CAI Ying-miao;ZHOU Kai;LI Hong-da;CHI Xing-jiang(Electric Power Research Institute of State Grid Beijing Electric Power Company,Beijing 100075,China;State Grid Beijing Electric Power Company,Beijing 100000,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100075 [2]国网北京市电力公司,北京100000

出　　处：《激光与红外》2024年第12期1954-1960,共7页Laser & Infrared

基　　金：电力系统气象监测与灾害风险预测能力提升关键技术研究项目(No.5200-202319382A-2-3-XG)资助。

摘　　要：为避免自然灾害影响输电线路正常输电,保障输电线路运行安全,设计面向保电的输电线路单档不均匀覆冰分布式光纤传感监测技术。通过种子光源、布里渊激光器等部件构建分布式光纤传感结构,利用该分布式光纤传感结构生成布里渊频移并获取光纤传感长度上的温度与应变的分布,分析布里渊频移产生的机理以及其与温度、应变之间的关系,为后续计算提供可靠依据;通过两档三塔模型,测量输电线路单档运行参数,并应用线路应力方程,计算单档不均匀覆冰的比载,结合单档不均匀覆冰比载与施加给输电线路的温度、应变情况,计算得到输电线路单档不均匀覆冰厚度,保障输电线路安全。经实验验证可知:该技术可精准监测覆冰时线路的应力变化,且监测得到的线路温度误差较低,可实时监测线路每一档距上的覆冰厚度。To avoid natural disasters affecting the normal transmission of power lines and to ensure the operation safety of transmission lines,a distributed optical fiber sensing monitoring technology for uneven icing on single transmission lines is designed for power conservation.The distributed fiber optic sensing structure is constructed using components such as seed light sources and Brillouin lasers,and the distributed fiber optic sensing structure is used to generate Brillouin frequency shifts and obtain the distribution of temperature and strain over the fiber sensing length.The mechanism of Brillouin frequency shifts and their relationship with temperature and strain are analyzed,providing a reliable basis for subsequent calculations.Through a two-stage,three-tower model,the operating parameters of a transmission line at a single stage are measured,and the line stress equation is applied to calculate the specific load of uneven icing at a single stage.By combining the specific load of uneven icing at a single stage with the temperature and strain conditions applied to the transmission line,the uneven icing thickness of the transmission line at a single stage is calculated to ensure its safety.After experimental verification,it can be concluded that this technology can accurately monitor stress changes in the line during icing,and the temperature error of the monitored line is relatively low,and the thickness of ice-covering can be monitored in real time on each file distance of the line.

关 键 词：面向保电 输电线路 不均匀覆冰 分布式光纤 种子光源 布里渊激光器 

分 类 号：TM764[电气工程—电力系统及自动化] TP212.44[自动化与计算机技术—检测技术与自动化装置]