Abstract
Iced conductor motion is induced by the aerodynamic instability of these conductors. The unsteady aerodynamic characteristics are different from the steady aerodynamic characteristics. The unsteady aerodynamic coefficients of typical iced conductors’ models under torsional motion are measured by the unsteady wind tunnel test. The unsteady aerodynamic coefficients of crescent-shape and sector-shape iced 4-bundle conductors under different torsional motion frequencies, wind velocities, and ice thicknesses are obtained. Wind test results show that there are significant differences between the unsteady and steady aerodynamic coefficients. The unsteady aerodynamic coefficients curve is a loop which is different from the steady aerodynamic coefficients. In addition, the obvious differences exist between unsteady aerodynamic coefficients of crescent-shape and sector-shape iced bundle conductors. Critical parameters, including torsional motion frequencies, wind velocity, ice shape, and ice thickness, have significant influences on unsteady aerodynamic coefficients. It shows that the wind tunnel experiment results are able to provide necessary data for the investigation of iced bundle conductor motion and their prevention techniques.
Highlights
4-bundle conductor 500 kV ultra-high voltage (UHV) transmission lines have been widely launched to solve the imbalance problem between electric power supply and demand
Iced conductor motion may lead to short circuit hardware failure, conductor’s failure, and even collapse of towers, which usually leads to power interruption. us, the control of iced conductor motion is still a hot topic in electrical engineering. e iced conductor motion of bundle conductor transmission lines is a typical fluid structure interaction (FSI) motion [4]. ese motions are induced by the aerodynamic instability of conductors
Cai et al [24] used finite element method (FEM) ABAQUS software to validate the availability of the aerodynamic coefficients determined by computational fluid dynamics (CFD) in the analysis of galloping characteristics of iced 4-bundle conductors and compared numerical results with the steady aerodynamic coefficients of these iced 4-bundle conductors acquired by wind tunnel measurements
Summary
4-bundle conductor 500 kV ultra-high voltage (UHV) transmission lines have been widely launched to solve the imbalance problem between electric power supply and demand. Yan et al [20] proposed the numerical method to investigate galloping behaviors of iced 4-bundle conductor lines based on the results of crescent-shape iced 4-bundle conductors obtained by the wind tunnel test. Wind tunnel tests were carried out by Lou et al [22] to acquire the steady aerodynamic characteristics of iced 6bundle conductors in different analysis parameters which are used in 750 kV UHV transmission lines. Cai et al [24] used FEM ABAQUS software to validate the availability of the aerodynamic coefficients determined by computational fluid dynamics (CFD) in the analysis of galloping characteristics of iced 4-bundle conductors and compared numerical results with the steady aerodynamic coefficients of these iced 4-bundle conductors acquired by wind tunnel measurements. The unsteady aerodynamic behaviors of crescentshape and sector-shape iced 4-bundle conductors are firstly acquired by wind tunnel measurements, in order to study the unsteady aerodynamic coefficients of 4-bundle 500 kV transmission lines. Tests are put into effect to acquire the unsteady aerodynamic characteristics of iced 4-bundle conductors varying with the wind attack angles under different torsional motion frequencies, ice shape, wind velocities, and ice thicknesses in the wind tunnel. e obtained results may provide the fundamental data for the development of antimotion techniques of 4-bundled conductor transmission lines
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