Integrated Monitoring Technology for Tension and Inclination of Overhead Transmission Lines Based on Fiber Bragg Grating

With the large-scale development and grid integration of renewable energy, an increasing number of ultrahigh voltage and extra-high voltage overhead transmission lines are being planned and constructed for long-distance transmission of renewable energy. These overhead lines inevitably pass through harsh outdoor areas with severe icing conditions. Monitoring the icing phenomenon is essential to ensure the safe operation of the lines. However, traditional icing monitoring sensors based on voltage and current variations face challenges such as difficulties in on-site power supply in long-term rainy, snowy, and freezing environments, as well as remote data transmission. Moreover, tension monitoring sensors based on fiber Bragg gratings (FBGs) and inclination monitoring sensors for insulator strings are typically designed separately, leading to complex installation and occupying multiple channels. To address these challenges, this study proposes a novel integrated monitoring sensor based on the principle of fiber Bragg gratings, which simultaneously monitors the axial tension of conductors and the inclination of suspension insulators. By decomposing the tension and wind deflection angles, the sensor can separate the influence of wind load from tension, thereby improving the accuracy of icing monitoring in overhead transmission lines.