Modeling and Analysis of Progressive Ice Shedding along a Transmission Line during Thermal De‐Icing

Abstract

Progressive ice shedding (PIS) along transmission lines is a common type of ice shedding during thermal de-icing that requires investigation to ensure the security of transmission lines. In current research, PIS is commonly analyzed using a constant speed for ice detaching from the conductor, which is not accurate for PIS simulation. Therefore, a mechanical model of PIS is established in this study to analyze PIS during thermal de-icing. First, an ice detachment model during thermal de-icing is built to determine the detachment times of the initial ice and remaining ice. Then, a two-node isoparametric truss element is employed to derive the static and dynamic equilibrium equations of an iced conductor to simulate the dynamic response of PIS. Relative to commercial software, these equations can easily accommodate the changing mass of ice with the flow of melted water. The dynamic equilibrium equations are then solved using the ice detachment model to obtain the dynamic response of PIS. Finally, small-scale and full-scale experimental results are employed to verify the proposed method. The simulation results show that the results of the proposed method are more consistent with the experimental results than are the results of existing methods that assume a constant propagation speed. The proposed method can be further applied to optimize transmission line designs and evaluate the application of thermal de-icing devices.

Research on transmission line dance monitoring and early warning system by fusing multi inertial sensors

“…According to different dance mechanisms, the dance mathematical models are divided into singledegree-of-freedom models, which only consider vertical vibration, two-degree-of-freedom models, which consider vertical and horizontal, and three-degree-of-freedom models, which consider vertical, horizontal and torsion. Each of the three models corresponds to a kind of dance mechanism, and at present, the three-degree-of-freedom model is widely used because it is closer to the field description, and the three-degree-of-freedom model simplifies the ice-covered conductor into a system with vertical, horizontal and torsional vibration at the same time [24][25].…”

Multiple Factors Coupling Probability Calculation Model of Transmission Line Ice-Shedding

“…In a study of amplitude characteristic analysis and ice-shedding restraining measures, based on the non-linear simulation model of a 3-DOF multi-level conductor insulator system independently developed by Tsinghua University, Wang et al [20] analyzed the dynamic mechanical ice-shedding characteristics of a 1000 kV ultra-high voltage (UHV) AC double-circuit transmission line on the same tower and proposed a scheme to suppress ice-shedding vibrations with phase-to-phase spacers. Xie et al [21] proposed a two-node isoparametric truss element finite element model to simulate the dynamic process of progressive ice-shedding (PIS), which can consider the mass variation of ice and dynamic force variation on the remaining ice. And the proposed method was validated through small-scale and full-scale experimental results, which showed it is more accurate than existing methods assuming constant ice-shedding speed.…”

A novel flying–walking power line inspection robot and stability analysis hanging on the line under wind loads

“…François et al (2018) proposed a multi-rotor inspection robot, which can carry a payload (5 kg) and land semiautomatically on the power line (Eisenbeiss, 2009). Chang et al (2017) designed a hybrid model inspection robot (Xie et al, 2019). Compared with other PLIRs, hybrid PLIRs integrate a walking mechanism and a flying mechanism to quickly land on and off lines and cross obstacles.…”