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.
Highlights
Ice shedding is one of the major sources of iced transmission line faults in cold regions
To study the dynamic response of Progressive ice shedding (PIS), a mechanical model of PIS during thermal de-icing is established in this study
An ice detachment model for the initial ice and the remaining ice is built based on an ice melting model and an ice mechanical model
Summary
Ice shedding is one of the major sources of iced transmission line faults in cold regions. The current research considers relatively simple ice shedding scenarios, such as a fixed amount of ice shedding from conductor It is not easy for existing methods to simulate progressive ice melting and the resultant complex dynamics, such as the mass variation and dynamic force variation on the remaining ice caused by conductor fluctuation [2,3,4,5,6,7,8,9]. To consider the complicated PIS during thermal de-icing, this paper proposes a new modeling method, which is able to deal with the progressive dynamics of PIS This method is based on the finite element mathematical model which is widely used in the research of suspended cable structures in mechanics [17].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
