Research on Optical Fiber Composite Overhead Wire (OPGW) Lightning Monitoring Technology Based on Weak Fiber Bragg Grating Array

Optical fiber composite overhead ground wire (OPGW), which consists of ground wire and communication function, has been widely used in transmission lines. Its running state is directly related to the security of power grid communication. In reality, the main environmental factors leading to OPGW malfunction include icing, mountain fire, wind vibration, etc., especially lightning stroke. In this paper, an OPGW temperature monitoring method based on Weak Fiber Bragg Grating (WFBG) array is proposed. By monitoring the temperature change caused by lightning stroke, the lightning stroke level identification and lightning stroke location are realized. The test results show that the minimum lightning discharge identification can reach to 9 C and the lightning location resolution is better than 0.1 m. Compared with other lightning temperature monitoring methods, lightning grade identification and positioning accuracy can be improved by this method, and it has the advantages of high real-time FBG, which provides a new approach for lightning monitoring of OPGW.