高电压技术2025，Vol.51Issue(7)：3191-3200,10.DOI:10.13336/j.1003-6520.hve.20241167
BOTDR监测OPGW覆冰最小临界厚度试验方法
Test Method for Minimum Critical Thickness of Ice Coating on OPGW Based on BOTDR Monitoring
摘要
Abstract
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.关键词
光纤复合架空地线(OPGW)/覆冰/布里渊光时域反射仪(BOTDR)/温度监测/张力监测Key words
optical fiber composite overhead ground wire/ice coating/Brillouin optical time domain reflectometer/temperature monitoring/tension monitoring引用本文复制引用
郝艳捧,毛典明,成延庭,黄磊,查传洋,黄欢..BOTDR监测OPGW覆冰最小临界厚度试验方法[J].高电压技术,2025,51(7):3191-3200,10.基金项目
智能电网国家科技重大专项(2024ZD0803100).Project supported by Smart Grid-National Science and Technology Major Project(2024ZD0803100). （2024ZD0803100）
