混合分布式与点式光纤传感机制在变电站中的应用研究

Application of Multiplexed Strategy of Distributed and Single Point Fiber Sensing Technique in Substation

由于舞动、覆冰等因素,光缆与变电站接触的相对位置会出现偏移,影响传感器对光缆参数检测的精准度,难以正确诊断光缆运行状态、故障原因以及故障位置。文章提出一种基于分布式传感器与点式传感器的混合光缆监测机制。通过测量布里渊中心频移和布拉格光栅谐振波长功率变化,分别计算光缆实时应力、温度等信息。以点式传感器的温度数据作为锚定,降低温度对分布式传感器的影响,提升分布式传感器对应力感应的测量精度。实验结果表明,文章提出的混合光缆监测机制能在50 km范围内保证2 m以下的空间分辨率,并且增加了对光缆突变信息源的区分能力。

Due to various complicated factors like optical fiber icing and galloping,the contact positions between cable and substation will be changed and the traditional conductor sensors cannot detect the condition or faults of conductors accurately.In this paper,a multiplexed strategy based on the distributed Brillouin scattering optical sensing technique combined with single point Fiber Bragg Grating(FBG)sensor is proposed.The real-time stress,temperature and other information of optical cable are calculated by measuring the central frequency shift of Brillouin zone and the power change of FBG resonant wavelength,respectively.The temperature data of the point sensor is used as anchoring to reduce the influence of temperature on the distributed sensor and improve the measurement accuracy of the distributed sensor on stress induction.The experiment results show that the proposed strategy guarantees the spatial resolution is less than 2 meters in the range of 50 kilometers and also adds the ability of identification of factors.