Abstract
The lift, drag and torsional moment coefficients, versus wind attack angle of iced quad bundle conductors in the cases of different conductor structure, ice and wind parameters are numerically simulated and investigated. With the Latin hypercube sampling and numerical simulation, sampling points are designed and datasets are created. Set the number of sub-conductors, wind attack angle, bundle spacing, ice accretion angle, ice thickness, wind velocity and diameter of the conductor as the input variables, a prediction model for the lift, drag and moment coefficients of iced quad bundle conductors is created, trained and tested based on the dataset and extra-trees algorithm. The final integrated prediction model is further validated by applying the aerodynamic coefficients from the prediction model and numerical simulation, respectively, to analyse the galloping features. The developed efficient prediction model for the aerodynamic coefficients of iced quad bundle conductors plays an important role in the quick investigation, prediction and early warning of galloping.
Highlights
Galloping accidents of iced transmission lines take place frequently and may give rise to flashover, breakage of conductors, collapse of towers and disruption of power supplies
The group of the authors of this paper investigated the aerodynamic characteristics of iced quad bundle conductors by means of the computational dynamics method [12], and the efficiency of the method was demonstrated with the wind tunnel test results
The aerodynamic characteristics of iced quad bundle conductors are simulated by numerical method, and parameter study is carried out to identify the effect of various factors on the aerodynamic coefficients
Summary
Galloping accidents of iced transmission lines take place frequently and may give rise to flashover, breakage of conductors, collapse of towers and disruption of power supplies. The aerodynamic coefficients of iced conductors depend on many parameters such as the diameter of sub-conductor, spacing between sub-conductors, ice shape and dimension, ice accretion angle, wind velocity and attack angle Because these parameters may change in a wide range, the determination of the aerodynamic coefficients with wind tunnel tests and numerical simulation is too expensive and time-consuming. I.e. the bundle spacing, ice accretion angle, ice thickness, wind velocity and diameter of the conductor, are set as the input of the prediction model, and the curves of the lift, drag and torsional moment varying with wind attack angle as the output. The created model can predict the three aerodynamic coefficients of iced quad bundle conductors efficiently and quickly, and it can be used to investigate the galloping behaviour of iced transmission lines, and develop anti-galloping devices and early warning system for galloping
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