The Theoretical Analysis And Test Research On Windage Yaw Of V-shaped Composite Insulators In UHV

The V-shaped insulator string in UHV can effectively limit the swing to reduce the size of the tower head and narrow the line corridor. The design of the V-shaped insulator traditionally avoids the insulator suffering the compression by limiting the included angle θ not less than 2 times the maximum windage angle φ. However more and more scholars believe that the insulator is allowed to be under pressure and with the construction of the UHV power grid, the use of composite insulators have become increasingly frequent. Therefore, it’s necessary to study the windage yaw characteristics of the composite insulator string to provide a reference for the structure design and operation. So the thesis regards the UHV V-shaped composite insulators and transmission line as the research objects and carries out the research from numerical simulations, theoretical analysis and experimental three aspects. The main work are as follows:(1)The composite insulators-transmission line coupled FEM model is parametrically simulated by using PYTHON program language, taking the characteristics of the orthotropic material into account. The principle to calculate the weight of the transmission line is deduced, two modeling methods of which are analyzed and compared for the influence on its position and shape and the windage yaw calculation.(2)The windage yaw process of V-shaped composite insulators is analyzed based on the ABAQUS FEM model and its stress and deformation rules are studied. The formula to calculate the maximum tensile stress of the windward leg is presented and verified.(3)The windage yaw simulation test of V-shaped composite insulators is designed and implemented. The maximum stress and displacement of the board center are measured. Then the experimental data are compared with the FEM simulation results while the error sources are analyzed, proving the FEM results reliable and drawing some useful conclusions.(4) The large deflection post-buckling analysis is carried out for a single composite insulator based on the large deflection theory. Finally the theoretical mechanical derivation for V-shaped composite insulators is done and its new design method is proposed.(5) The atmospheric boundary layer wind field characteristics are analyzed and using MATLAB to numerically simulate fluctuating wind. The difference of the line windage yaw angle of V-shaped composite insulators under static wind and fluctuating wind is studied based on the FEM model of composite insulators-transmission line coupling system, of which the influence factors are analyzed and the line windage yaw angle correction method is brought out.