基于光纤的电力电缆外力入侵探测

Optical Fiber-based Power Cable Intrusion Detection

分布式光纤振动传感技术具有精度高、动态范围大、响应频带宽、隐蔽性好等鲜明特点,是一种重要的可应用于有光缆伴随电力电缆的外力振动入侵预警防护技术。文章分别应用双MZ干涉原理和迈克尔逊干涉原理,搭建了完整的有光缆伴随电力电缆的外力振动入侵预警预报系统,通过对2套系统的报警机制及时域和频谱域波形特征的研究,创造性地提出了外力入侵危害程度的探测机制和可能的入侵类型模式判断方法。对于频繁的施工作业点能有效监测和监管,对于临时突发型施工作业入侵能及时报警并指导现场人员进行干预,通过对时间域和频谱域信号的分析还能对人工作业和机械设备施工类型进行预判和分析,给有伴随光缆的电力电缆防护能力提升提供了更多可能性。

Distributed optical fiber vibration sensing technology has the distinctive features of high precision,large dynamic range,wide response bandwidth,and good concealment.It is an important application for external force vibration intrusion early warning protection technology of power cable which buried with optical cable.Based on the double MZ interference principle and the Michelson interference principle,a complete external vibration intrusion early warning and forecasting system of power cable which buried with optical cable was built.Through the research on the alarm mechanism of the two systems,the waveform characteristics of the time domain and the spectral domain were creatively proposed.The detection mechanism of the degree of damage and the possible method of judging the type of intrusion.It can effectively monitor and supervise frequent construction operation points,timely report to the temporary and sudden construction operation intrusion and guide the on-site personnel to intervene.Through the analysis of the time domain and spectrum domain signals,manual operations and mechanical equipment can also be distinguished,which provides more possibilities for the improvement of the protection capability of power cables,which accompanied by optical cables.