石墨烯涂覆微纳光纤气体传感机理与SF_(6)分解组分SO_(2)检测  

Graphene coated micro/nano fiber gas sensing mechanism and SF_(6) decomposition component SO_(2) detection

作　　者：张引 陈奥 余雯雯 张国治 蔡逸杰 张晓星 ZHANG Yin;CHEN Ao;YU Wenwen;ZHANG Guozhi;CAI Yijie;ZHANG Xiaoxing(Hubei University of Technology,Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Wuhan 430068,China)

机构地区：[1]湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,湖北武汉430068

出　　处：《电力工程技术》2025年第2期220-228,共9页Electric Power Engineering Technology

基　　金：湖北省自然科学基金资助项目(2021CFA025,2022CFB863)。

摘　　要：准确有效监测气体绝缘设备(gas insulated equipment,GIE)内部SF_(6)分解组分对设备故障诊断及状态评估具有重要意义。但现有外置检测方法受采样点和设备内组分扩散速率限制,难以精确掌握设备内组分浓度。为此,文中提出一种基于表面涂覆微纳光纤(micro/nano fiber,MNF)的SF_(6)分解组分SO_(2)检测方法,具有应用于GIE内置光纤传感在线监测的潜力。基于密度泛函理论分析石墨烯的光学气敏响应性能,搭建光纤环形腔衰荡(fiber-loop ringdown,FLRD)气体检测系统,开展典型SF_(6)分解组分检测实验。仿真结果表明,石墨烯在吸附SO_(2)气体分子后,光学特性变化较为显著,说明其对SO_(2)具有良好的光学气敏响应性能。实验结果同样发现,该气体检测系统可实现常温下低浓度的SO_(2)气体检测,在0~200μL/L浓度范围内呈现良好的线性关系,SO_(2)检测最大相对误差为4.89%,灵敏度为0.81 ns/(μL·L^(−1));而增加光纤放大器可以有效提升检测性能,系统灵敏度达到1.24 ns/(μL·L^(−1))。文中所提检测方法为GIE内置式光纤传感在线监测SF_(6)分解组分提供了一种新的思路。Accurate and effective monitoring of SF_(6) decomposition components inside the gas-insulated equipment(GIE)is crucial for the equipment fault diagnosis and condition assessment.However,the existing external detection methods are limited by sampling points and the diffusion rate of these components,making it difficult to accurately determine the concentration of the components.Therefore,in this paper,a method for detecting the SF_(6) decomposition component SO_(2) based on surface-coated micro/nano fibers(MNF)is proposed,which has the potential to be applied in built-in fiber optic sensing for GIE online monitoring.The optical gas-sensitive response performance of the graphene is analyzed based on the density functional theory.A fiber-loop ring-down(FLRD)gas detection system is constructed,and typical SF_(6) decomposition component detection experiments are carried out.The simulation results show that the optical properties of graphene change significantly after the adsorption of SO_(2) gas molecules,indicating its excellent optical gas-sensitive response performance to SO_(2).The experimental results also show that the gas detection system can detect the trace SO_(2) gas at room temperature.It shows a good linear relationship within the concentration range of 0~200μL/L.The maximum error of SO_(2) detection is 4.89%,and the sensitivity is 0.81 ns/(μL·L^(−1)).The detection performance is improved by adding an optical fiber amplifier,and the sensitivity of the system reaches 1.24 ns/(μL·L^(−1)).The method proposed in this paper provides a new approach for online monitoring of SF_(6) decomposition components using GIE built-in optical fiber sensors.

关 键 词：气体绝缘设备(GIE)在线监测 SF_(6)分解组分 光纤气体传感 表面涂覆 气体检测 微纳光纤(MNF) 

分 类 号：TM930[电气工程—电力电子与电力传动]