A distributed online fiber sensing system based on the phase-sensitive optical time domain reflectometer(Φ-OTDR)enhanced by the drawing tower fiber Bragg grating(FBG)array is presented and investigated experimentally...A distributed online fiber sensing system based on the phase-sensitive optical time domain reflectometer(Φ-OTDR)enhanced by the drawing tower fiber Bragg grating(FBG)array is presented and investigated experimentally for monitoring the galloping of overhead transmission lines.The chirped FBG array enhanced Φ-OTDR sensing system can be used to measure the galloping behavior of the overhead transmission lines(optical phase conductor or optical power ground wire),which are helpful for monitoring the frequency response characteristics of the ice-induced galloping,evaluating the motion tendencies of these cables,and avoiding the risk of flashover during galloping.The feasibility of the proposed online monitoring system is demonstrated through a series of experiments at the Special Optical Fiber Cable Laboratory of State Grid Corporation of China(Beijing,China).Results show that the proposed system is effective and reliable for the monitoring of galloping shape and characteristic frequency,which can predict the trend of destructive vibration behavior and avoid the occurrence of cable breaking and tower toppling accidents,and these features are essential for the safety operation in smart grids.展开更多
覆冰舞动是严重威胁输电线路安全运行的自然灾害之一。2015年1月28日,湖北地区多条500 k V超高压线路发生覆冰舞动,造成放电、跳闸、断线等数起严重事故。根据该地区气候变化过程,以及线路参数、覆冰条件,气动参数以及防舞器布置方案等...覆冰舞动是严重威胁输电线路安全运行的自然灾害之一。2015年1月28日,湖北地区多条500 k V超高压线路发生覆冰舞动,造成放电、跳闸、断线等数起严重事故。根据该地区气候变化过程,以及线路参数、覆冰条件,气动参数以及防舞器布置方案等情况,利用基于曲梁模型并考虑防舞器分布的输电线路覆冰舞动三自由度方程,得到荆林Ⅰ、Ⅱ、Ⅲ回,三江II回,南荆I线湖北段等线路覆冰舞动的平均方程,并依此对其进行了非线性动力学理论分析。得到结论:(1)该事故是典型的Nigol舞动;(2)双摆防舞器的合理安装可有效提升线路的防风抗振能力;(3)在理论计算基础上,给出了双摆防舞器的合理布置数量和次档距建议。本文分析过程和结论为提升输电线路防风抗振能力打下理论基础。展开更多
把单目视觉分析方法应用于输电线路舞动测量中,通过在舞动试验机和小档距试验线路上的对比试验,表明该方法测量精度较高,频率测量误差优于1%,幅值优于3%,证明了单目视觉分析方法在输电线路舞动测量方面的适用性和有效性。同时,采用该方...把单目视觉分析方法应用于输电线路舞动测量中,通过在舞动试验机和小档距试验线路上的对比试验,表明该方法测量精度较高,频率测量误差优于1%,幅值优于3%,证明了单目视觉分析方法在输电线路舞动测量方面的适用性和有效性。同时,采用该方法对500 k V真型试验线路的2次舞动事件进行了分析,得出了500 k V真型试验线路2次舞动的舞动幅值、频率和阶次等主要特征参数及线路舞动动态轨迹、特征点二维断面图,可以为500 k V输电线路结构和防舞装置设计提供参考数据。所研究的方法和得出的结论为如何防治舞动提供了基础方法和数据支持。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61775173,61975157,and 52071245)the Science and Technology Project of State Grid Corporation of China(Research on the basic technology of the next generation intelligent optical cable based on grating array fiber sensor,Grant No.5442XX190009).
文摘A distributed online fiber sensing system based on the phase-sensitive optical time domain reflectometer(Φ-OTDR)enhanced by the drawing tower fiber Bragg grating(FBG)array is presented and investigated experimentally for monitoring the galloping of overhead transmission lines.The chirped FBG array enhanced Φ-OTDR sensing system can be used to measure the galloping behavior of the overhead transmission lines(optical phase conductor or optical power ground wire),which are helpful for monitoring the frequency response characteristics of the ice-induced galloping,evaluating the motion tendencies of these cables,and avoiding the risk of flashover during galloping.The feasibility of the proposed online monitoring system is demonstrated through a series of experiments at the Special Optical Fiber Cable Laboratory of State Grid Corporation of China(Beijing,China).Results show that the proposed system is effective and reliable for the monitoring of galloping shape and characteristic frequency,which can predict the trend of destructive vibration behavior and avoid the occurrence of cable breaking and tower toppling accidents,and these features are essential for the safety operation in smart grids.
文摘覆冰舞动是严重威胁输电线路安全运行的自然灾害之一。2015年1月28日,湖北地区多条500 k V超高压线路发生覆冰舞动,造成放电、跳闸、断线等数起严重事故。根据该地区气候变化过程,以及线路参数、覆冰条件,气动参数以及防舞器布置方案等情况,利用基于曲梁模型并考虑防舞器分布的输电线路覆冰舞动三自由度方程,得到荆林Ⅰ、Ⅱ、Ⅲ回,三江II回,南荆I线湖北段等线路覆冰舞动的平均方程,并依此对其进行了非线性动力学理论分析。得到结论:(1)该事故是典型的Nigol舞动;(2)双摆防舞器的合理安装可有效提升线路的防风抗振能力;(3)在理论计算基础上,给出了双摆防舞器的合理布置数量和次档距建议。本文分析过程和结论为提升输电线路防风抗振能力打下理论基础。
文摘把单目视觉分析方法应用于输电线路舞动测量中,通过在舞动试验机和小档距试验线路上的对比试验,表明该方法测量精度较高,频率测量误差优于1%,幅值优于3%,证明了单目视觉分析方法在输电线路舞动测量方面的适用性和有效性。同时,采用该方法对500 k V真型试验线路的2次舞动事件进行了分析,得出了500 k V真型试验线路2次舞动的舞动幅值、频率和阶次等主要特征参数及线路舞动动态轨迹、特征点二维断面图,可以为500 k V输电线路结构和防舞装置设计提供参考数据。所研究的方法和得出的结论为如何防治舞动提供了基础方法和数据支持。
