Ice thickness estimation method of overhead line based on distributed optical fiber temperature sensing

Abstract

In order to monitor icing condition of overhead line based on distributed optical fiber temperature sensing, the transient temperature field models of radial and axial heat transfer for iced overhead line are constructed. The finite element method is used to solve the model to obtain the axial and radial temperature distribution inside the overhead line. Based on the two models, the change of the optical fiber temperature with time when the ambient temperature changes at a certain rate is investigated. At the same time, the change of optical fiber temperature with time in the iced and uniced sections under different ice thicknesses is also investigated. On this basis, the change of temperature difference with time is investigated. The formula of ice thickness estimation according to the temperature difference between iced and uniced sections’ optical fibers is obtained. This work lays a foundation for the evaluation of ice condition of overhead line based on distributed optical fiber temperature sensing.