复杂物理环境下基于DOFS的输电线路覆冰监测分析

Analysis of Transmission Line Icing Monitoring Based on DOFS in Complex Physical Environments

分布式光纤传感(distributed optical fiber sensing,DOFS)技术由于其无源、可长距离连续监测和维护方便等优点,十分适用于输电线路覆冰监测,然而复杂物理环境下DOFS对多种参量同时敏感,监测各类工况时容易出现误判。为此,从DOFS可监测的物理量出发,研究复合架空地线(optical fiber composite overhead ground wire,OPGW)覆冰时的温度、应力和振动频率等参量的变化特征,讨论利用单一参量进行监测的局限性;基于OPGW覆冰监测数据,推算导线的覆冰情况,进而对输电线路的整体覆冰情况进行评估;最后,结合实验介绍基于多参量DOFS的输电线路覆冰监测策略。

Due to the advantages including passive feature,function of continuous long-distance monitoring and convenient maintenance,the distributed optical fiber sensing(DOFS)technology is applicable to icing monitoring of the transmission lines.However,in a complex physical environment,the DOFS is sensitive to multiple physical quantities at the same time,it is prone to cause misjudgment when monitoring various working conditions.In order to solve the above problems,this paper aims to study variation characteristics of the parameters of the optical fiber composite overhead ground wire(OPGW)in icing state such as the temperature,the stress and vibration frequency,and so on based on the physical quantities of the DOFS that can be monitored.It also discusses the limitation only using a single parameter for monitoring.According to icing monitoring data of the OPGW,the paper calculates the icing condition of the wire and makes an evaluation of the overall icing state of the transmission line.Finally,combining with the experiment,it introduces the icing monitoring strategy for the transmission line based on the multi-parameter DOFS.