面向变压器绕组复合光纤状态监测的BOTDR扫频策略研究  

Research on BOTDR scanning strategy for transformer winding composite fiber state monitoring

作　　者：王勇 马迅 贾旭超 刘凯 陈永辉 WANG Yong;MA Xun;JIA Xuchao;LIU Kai;CHEN Yonghui(State Grid Hebei Electric Power Co.,Ltd.,Marketing Service Center,Shijiazhuang 050035,China;Department of Electronics&Communication Engineering,North China Electric Power University,Baoding Hebie 071003,China)

机构地区：[1]国网河北省电力有限公司营销服务中心,石家庄050035 [2]华北电力大学电子与通信工程系,河北保定071003

出　　处：《光通信技术》2024年第6期68-74,共7页Optical Communication Technology

基　　金：河北省自然科学基金项目(批准号:E2020502010)资助;中央高校基本科研业务费项目(批准号:2019MS090)资助。

摘　　要：为提高布里渊光时域反射计(BOTDR)在变压器绕组复合光纤状态监测中的准确性,提出了一种BOTDR扫频范围选择策略。该策略通过仿真生成了具有不同信噪比、扫频范围和扫频不对称系数的布里渊谱,并采用伪Voigt模型谱拟合算法来计算布里渊频移;同时,研究了信噪比、扫频范围和扫频不对称系数这3个因素对布里渊频移提取准确性的影响规律。实验结果表明:当扫频范围围绕布里渊频移对称时,误差达到最小;在扫频点数固定的情况下,随着扫频范围的增大,频移误差先减小后增大,当扫频范围比布里渊频移变化幅值大一个线宽时,误差达到最小值。To improve the accuracy of Brillouin optical time domain reflectometry(BOTDR)in monitoring the state of transformer winding composite optical fibers,a BOTDR sweep range selection strategy is proposed.This strategy generates Brillouin spectra with different signal-to-noise ratios,sweep frequency ranges,and sweep frequency asymmetry coefficients through simulation,and uses the pseudo Voigt model spectral fitting algorithm to calculate the Brillouin frequency shift.Meanwhile,the influence of three factors,namely signal-to-noise ratio,sweep frequency range,and sweep frequency asymmetry coefficient,on the accuracy of Brillouin frequency shift extraction is studied.The experimental results show that when the scanning range is symmetrical around the Brillouin frequency shift,the error reaches its minimum.In the case of a fixed number of sweep frequency points,as the sweep frequency range increases,the frequency shift error first decreases and then increases.When the sweep frequency range is one linewidth larger than the amplitude of the Brillouin frequency shift change,the error reaches its minimum value.

关 键 词：变压器 光纤 布里渊光时域反射计 温度和应变 扫频范围 布里渊频移 

分 类 号：TN247[电子电信—物理电子学]