Abstract
Due to the uncontrollable weather conditions, it is difficult to carry out the controllable prototype test to study fatigue damage of transmission tower and armour clamp and the effect evaluation of antigalloping device under actual transmission line galloping. Considering the geometric nonlinearity of the transmission line system, this study proposed an adaptive excitation method to establish the controllable transmission line galloping test system based on the Den Hartog vertical oscillation mechanism. It can skip the complicated process of nonlinear aerodynamic force simulation. An electromagnetic repulsion mechanism based on the eddy current principle was designed to provide periodic excitation for the conductor system according to the adaptive excitation method. The finite element model, including conductor, insulator string, and electromagnetic mechanism, was established. Newmark method and fourth-order Runge-Kutta algorithm were used to complete the integrated simulation calculation. By comparing with the measured data record of the actual transmission line galloping test, the results show that the proposed adaptive galloping excitation system can effectively reconstruct the key characteristics of the actual transmission line galloping, such as amplitude, frequency, galloping mode, and dynamic tension, and make the galloping state controllable. Thus, a series of research about transmission line galloping with practical engineering significance can be carried out.
Highlights
Research ArticleJiangjun Ruan ,1 Li Zhang ,1 Wei Cai, Daochun Huang, Jian Li, and Zhihui Feng
With the rapid development of power grid and the frequent occurrence of severe weather, the frequency and the extent of damage caused by the transmission line galloping are increasing obviously
It is easy to cause phase-to-phase short-circuit fault, trips caused by flashovers, damage of armour clamps, spacers, transmission towers, or even tower collapse, which seriously threaten the safe and stable operation of the power grid. erefore, it is necessary to establish the transmission line galloping test system to explore the influence of galloping on conductors and towers, armour clamp, and components of the transmission line system
Summary
Jiangjun Ruan ,1 Li Zhang ,1 Wei Cai, Daochun Huang, Jian Li, and Zhihui Feng. Due to the uncontrollable weather conditions, it is difficult to carry out the controllable prototype test to study fatigue damage of transmission tower and armour clamp and the effect evaluation of antigalloping device under actual transmission line galloping. Considering the geometric nonlinearity of the transmission line system, this study proposed an adaptive excitation method to establish the controllable transmission line galloping test system based on the Den Hartog vertical oscillation mechanism. It can skip the complicated process of nonlinear aerodynamic force simulation. By comparing with the measured data record of the actual transmission line galloping test, the results show that the proposed adaptive galloping excitation system can effectively reconstruct the key characteristics of the actual transmission line galloping, such as amplitude, frequency, galloping mode, and dynamic tension, and make the galloping state controllable. us, a series of research about transmission line galloping with practical engineering significance can be carried out
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