3D Reconstruction of the Shape of Overhead Transmission Line Based on FBG

In order to solve the morphological awareness needs of overhead transmission line, a 3D reconstruction algorithm of composite overhead transmission line shape embedded three intervals of 120° nonorthogonal FBG array was proposed, which has temperature self-compensation characteristics. The overhead transmission line form 3D reconstruction process was elaborated in detail, the model of transmission line based on FBG was established and the three-dimensional coordinate expression of the trajectory line was derived. Combined with the finite element model, the simulation comparison experiments were carried out, and the trajectory and sag of 200 m span transmission line with equal height and unequal height at both ends were analyzed under the conditions of self-weight and icing. The trajectory line morphology obtained from the morphology perception algorithm proposed in the article is basically consistent with finite element model simulation, with a maximum sag error of no more than 4.5%. It has high reconstruction accuracy and can be used for the perception of three-dimensional morphology and sag of overhead transmission lines.