Power transmission line gentle breeze vibration online monitoring system

The invention relates to a power transmission line gentle breeze vibration online monitoring system. The system comprises gentle breeze vibration monitoring devices, a fiber link and an optical signal device. A power transmission line is provided with multiple monitoring objects in one-to-one correspondence with the gentle breeze vibration monitoring devices, and the gentle breeze vibration monitoring devices are installed on the monitoring objects corresponding thereto on the power transmission line. According to the invention, the gentle breeze vibration monitoring devices which are installed on the power transmission line and are provided with fiber gratings are employed for receiving first optical signals sent by the optical signal device and reflecting second optical signals; and according to the first optical signals and the second optical signals, the amplitude and the frequency of each monitoring object are calculated, and fatigue degree parameters of the power transmission line are finally obtained. According to the fatigue degree parameters, the gentle breeze vibration condition of the power transmission line can be accurately determined, the anti-interference capability of gentle breeze vibration online monitoring of the power transmission line is enhanced, and the reliability of the power transmission line gentle breeze vibration online monitoring system is effectively improved.