摘要
覆冰严重威胁光纤复合架空地线(optical fiber composite overhead ground wire,OPGW)安全运行,然而布里渊光时域反射仪(Brillouin optical time domain reflectometer,BOTDR)监测覆冰厚度的范围与感知模型尚未明晰。为此,该文提出了基于BOTDR的OPGW自然覆冰最小临界传感厚度监测方法:当OPGW覆冰厚度较小时,假设布里渊频移只受温度影响,随着OPGW覆冰逐渐增长布里渊频移监测温度误差增大,布里渊频移监测温度超过判定区间时对应的覆冰厚度定义为最小临界传感厚度。在南方电网梅花山防冰减灾重点实验室搭建OPGW覆冰BOTDR监测系统验证了该方法的有效性,研究结果表明:BOTDR在OPGW自然覆冰条件下能监测到其最小临界传感厚度,试验中171 m孤立档OPGW最小临界传感厚度为11.61 mm;当覆冰厚度小于11.61 mm时,BOTDR布里渊频移仅能监测温度,布里渊频移监测温度与微气象终端监测温度最大差值为1.5℃,在本文试验用BOTDR的温度精度±2℃范围内,BOTDR不能感知小于最小临界传感厚度的轻度覆冰;当覆冰厚度大于11.61mm时,BOTDR布里渊张力频移与OPGW覆冰张力强线性相关,相关系数为0.99。该文研究为长距离OPGW覆冰BOTDR准确监测提供了理论依据。
Ice coating is a serious threat to the safe operation of the optical fiber composite overhead ground wire(OPGW).However,the effective monitor range and sensing model for ice coating thickness using Brillouin optical time domain reflectometry(BOTDR)remain undefined.This paper proposes a BOTDR-based methodology for monitoring the minimum critical sensing thickness of natural ice coating on OPGW.Under thin ice coating conditions,the Brillouin fre-quency shift is assumed to be solely temperature-dependent.As ice thickness increases,the error in temperature monitored by Brillouin frequency shift measurements grows.The ice thickness at which the temperature monitored by Brillouin frequency shift exceeds its judgment interval is defined as the minimum critical sensing thickness.A BOTDR monitoring system was deployed at Key Laboratory of Ice Prevention&Disaster Reducing of China Southern Power Grid for validation.The results demonstrate that,BOTDR is capable of detecting the minimum critical sensing thickness of OPGW under natural ice coating conditions,and the minimum critical sensing thickness in the test is 11.61 mm.When the ice coating is thinner than the minimum critical sensing thickness,the temperature monitored by Brillouin frequency shift of BOTDR can only monitor the temperature,the maximum difference between the temperature monitored by Brillouin frequency shift and the temperature monitored by the micrometeorological terminal is 1.5℃,within the temperature ac-curacy of±2℃of the BOTDR used for testing in this paper,and the BOTDR can not sense the light ice coating thinner than the minimum critical sensing thickness.When the ice coating is thicker than the minimum critical sensing thickness,the BOTDR Brillouin frequency shift of the tension-dependent Brillouin frequency shift is strongly linearly correlated with the OPGW ice coating tension with a correlation coefficient of 0.99.The research of this paper provides a theoretical basis for accurate monitoring of ice coating on long-distance OPGW lines based on BOTDR technology.
作者
郝艳捧
毛典明
成延庭
黄磊
查传洋
黄欢
HAO Yanpeng;MAO Dianming;CHENG Yanting;HUANG Lei;ZHA Chuanyang;HUANG Huan(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Electric Power Research Institute of Guizhou Grid Co.,Ltd.,Guiyang 550000,China)
出处
《高电压技术》
北大核心
2025年第7期3191-3200,共10页
High Voltage Engineering
基金
智能电网国家科技重大专项(2024ZD0803100)。
作者简介
郝艳捧,1974-,女,博士,教授,博导主要从事智能电网与智能设备、电力大数据与人工智能、计算高电压工程学、电力设备数字孪生与高性能计算、等离子体及其应用、先进功能电介质材料等研究,E-mail:yphao@scut.edu.cn;通信作者:黄磊,1994-,男,博士主要从事电力设备在线监测技术、光纤复合绝缘子状态感知技术与光纤布拉格光栅传感等研究,E-mail:leooel@scut.edu.cn;毛典明,2000-,男,硕士生主要研究方向为输电线路覆冰状态在线监测,E-mail:maodianmingwork@163.com。
