基于FBG的输电线路微风振动在线监测方法

输电线路导线和地线振动往往造成线路断股断线、金具脱离等危害，现有的导线微风振动监测装置采用互感取电方式供电，而地线监测装置采用电池供电，使用寿命较短，且易受电磁干扰、雷击电流的影响。针对这些问题，开发了基于光纤光栅（fiber Bragg grating，FBG）传感器的输电线路微风振动在线监测系统，系统采用悬臂梁结构的光纤光栅传感器测量地线振动时反射光的波长变化，并通过OPGW/OPPC将光信号发送至变电站的光纤光栅解调仪，再通过安装在变电站的状态监测装置计算出导地线的动弯应变、振动幅值以及振动频率。系统可以实现地线微风振动的无源测量，不再存在电源供电的问题。此外，结合光纤光栅传感器抗电磁干扰、精度高的特点，提高了系统的稳定性和可靠性。

Research on Online Monitoring Method of Aeolian Vibration on Transmission Lines Based on FBG

The conductor and fittings could be damaged because of aeolian vibration of overhead transmission lines. The existing aeolian vibration monitoring devices use mutual inductor and lithium battery as power source, which has short lifespan and also are susceptible to electromagnetic interference and lightning surge current. An aeolian vibration monitoring system based on fiber bragg grating(FBG) is presented. FBG interrogator is used as sensor to detect reflected light wavelength variation during grounding wire vibration. The optical signal is sent through OPGW/OPPC to FBG demodulator inside substation to calculate grounding wires parameters including strain, vibration amplitude and frequency. The proposed online monitoring system does not require onsite power supply, has high resistance to electromagnetic interference and high measurement accuracy, which in turn improves system stability and reliability.