Abstract
Due to the occurrence of whole-span and subspan vibration at the same time during the galloping of the iced bundle conductors, the distance between the subconductors changes, resulting in the variation of the aerodynamic parameters for the leeward subconductors. The existing conventional studies usually only consider the whole-span galloping, ignoring the relative motion and the electromagnetic force between the subconductors. Based on considering the above two factors at the same time, a new numerical simulation method to study the galloping behaviors of the iced conductors is presented. Then, the galloping behaviors of the iced twin bundle conductors’ transmission line with different current intensity, initial wind attack angle, and spacer layout are studied. The galloping oscillation behaviors include time histories of vibration displacements, mode, amplitude, frequency, motion traces, and the distance between two subconductors. The simulation results showed that the whole-span and subspan vibration appear at the same time during galloping oscillation and two subconductors may collide with each other when affected by the varying electromagnetic and aerodynamic forces. The effects of varying electromagnetic and aerodynamic forces on galloping behavior cannot be ignored. The new method presented in this work can contribute to the galloping study of the iced bundle conductors.
Highlights
Galloping is one of the most important factors to affect the safety of iced bundle conductor transmission lines [1]. e whole-span and subspan vibration of bundle conductors may occur at the same time when galloping takes place
It may cause rupture of the conductors, collision between subconductors, and collapse of the towers, endangering the safe operation and inflicting large economic loss. erefore, in order to restrain the galloping of conductors more effectively, it is necessary to understand the galloping characteristics of bundle conductors more accurately. is paper mainly focuses on the galloping oscillation of the iced twin bundle conductor
It can be seen that the laws and slopes of the aerodynamic coefficients with wind attack angle obtained by the wind tunnel test and by the numerical simulation are very similar. e difference between the aerodynamic parameters obtained by the wind tunnel test and those obtained by the numerical simulation is acceptable. erefore, the numerical method, which has been used in reference [18], can be used to study the aerodynamic coefficients of an iced bundle conductor
Summary
Galloping is one of the most important factors to affect the safety of iced bundle conductor transmission lines [1]. e whole-span and subspan vibration of bundle conductors may occur at the same time when galloping takes place. Compared with the wind tunnel test results, it is found that simplifying each subconductor into a group can more accurately simulate the galloping of the research conductor. Besides,there are some research studies [1, 12,13,14,15,16,17] on the wake-induced vibration of the bare bundle conductor using 2-D or simplified 3-D models, in which the aerodynamic characteristics of the subconductors varying with their relative position between subconductors were considered. In order to study galloping of iced twin bundle conductor lines, the aerodynamic characteristics of the subconductors varying with the wind attack angle and the relative position between two subconductors are numerically simulated by the FLUENT software. E numerical simulation method based on the user-defined subroutine UEL in ABAQUS software for galloping oscillation of iced twin bundle conductor lines is presented. In order to study galloping of iced twin bundle conductor lines, the aerodynamic characteristics of the subconductors varying with the wind attack angle and the relative position between two subconductors are numerically simulated by the FLUENT software. e numerical simulation method based on the user-defined subroutine UEL in ABAQUS software for galloping oscillation of iced twin bundle conductor lines is presented. is method considered the variation of aerodynamic forces with both wind attack angle and the relative position between subconductors and the variation of electromagnetic forces with the relative position. e galloping oscillation behaviors of iced twin bundle conductors under different parameters are numerically investigated. e new method presented in this work can contribute to the galloping study of the iced bundle conductors and the development of antigalloping techniques
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