摘要
【目的】在智能变电站建设过程中,为精确检测智能变电站光纤回路中光纤熔接、受压等因素导致的非反射性事件,提出了基于光时域反射仪(OTDR)的智能变电站光纤回路检测改进方法。【方法】通过时钟移相模块进行移相,并进行多次重复测量,对各相位数据进行插值组合,得到更高的采样频率。这样可以在不增加硬件成本的基础上大幅提高OTDR的采样精度。同时通过小波去噪和突变量信号增强技术,抑制噪声,突出增强事件点的小波系数,使有用的信号更加容易被检测出来,提高了智能变电站光纤回路的检测水平。【结果】经过现场试验检测,该方法能够精准地检测出光纤受压、过度弯曲、熔接不良等事件点。【结论】该方法能够有效检测智能变电站光纤回路中存在的异常现象,防止隐蔽性缺陷影响变电站的运行,具有较大的工程应用价值。
[Purposes]During the construction of intelligent substation,to accurately detect non reflective events such as fiber fusion and compression of the fiber optic circuit in intelligent substations,an im-provement method of optical fiber loop detection in smart substation based on OTDR is proposed.[Meth-ods]The clock phase-shifting module is used to perform phase shifting and multiple repeated measure-ments,and then the interpolation and combination of each phase data are performed to obtain a higher sampling frequency.This method significantly improves the sampling accuracy of the optical time do-main reflectometer(OTDR)without increasing hardware costs.At the same time,through wavelet de-noising and sudden variable signal enhancement techniques,noise is suppressed and the wavelet coeffi-cients of event points are highlighted.The useful signals are easier to be detected and the detection level of intelligent substation fiber optic circuits is comprehensively improved.[Findings]After on-site test-ing,the proposed method can accurately detect events such as fiber compression,excessive bending and poor fusion.[Conclusions]Those methods can effectively detect abnormal phenomena of the fiber optic circuit in intelligent substations,prevent hidden defects from affecting the operation of substations,and has great engineering application value.
作者
马伟东
王阳
黄太昱
李笑宇
MA Weidong;WANG Yang;HUANG Taiyu;LI Xiaoyu(State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China;Henan Jiuyu Epri Electric Power Technology co.,Ltd.,Zhengzhou 450052,China)
出处
《河南科技》
2024年第20期5-9,共5页
Henan Science and Technology
