基于长距离BOTDR的OPGW融冰实时在线监测技术研究

Research on Real-time and On-line Monitoring Technology of Ice-melting for OPGW Based on Long Distance BOTDR

光纤复合架空地线(OPGW)的融冰过程缺乏实时在线的监测手段,因此,对OPGW光缆的温度变化进行实时预警和安全控制存在较大困难。为了解决该问题,本文提出了一种基于布里渊光纤时域反射仪(BOTDR)的方法,采用了宽带接收快速测量技术和分布式拉曼放大的技术,可以实现接近100 km的传感测量。本文还介绍了在南方电网超高压线路OPGW融冰过程中,基于该技术的实时在线温度监测实验。实验结果表明,在整个融冰过程中,OPGW光纤不同位置处的温度非常不均匀且变化迅速,温度变化差异大于40℃,表明了长距离实时温度监测的重要意义。

Due to the lack of real-time and on-line monitoring of Optical Fiber Composite Overhead Ground Wire(OPGW)for the process of ice-melting,temperature early warning and safety control of DC in ice-melting process is difficult.Here we propose a Brillouin Optical Fiber Time-domain Reflectometry(BOTDR)with broadband receiving for fast measurement and with distributed Raman amplification for long distance measurement reaching 100 km.A field experiment for real-time and on-line temperature monitoring of ice-melting of OPGW is also reported.Dramatic difference of temperature changes greater than 40ºC over different positions of OPGW during ice-melting is observed.