Abstract
Taking a 10kV test transformer as the research object, based on the analysis of transformer vibration and noise vibration sources, the oil tank model of the test transformer is established firstly, and the vibration mode analysis of the oil tank is carried out, and the typical vibration modes of transformer oil tanks with different thicknesses are obtained Then, according to the characteristics of vibration and vibration source of distribution transformer tank wall, the design method and parameter optimization analysis of transformer tank wall vibration absorption are carried out. The analysis shows that the principle of dynamic vibration absorption is clear, and the vibration of the box wall can be effectively controlled with 76% vibration reduction efficiency under the condition of reasonable arrangement of vibration absorption devices and parameter selection. The vibration control effect of vibration absorber increases with the increase of mass ratio between vibration absorber and transformer tank wall. When the mass ratio is determined, the closer the stiffness of vibration absorber is to the optimal stiffness, the better the vibration reduction effect will be.
Highlights
With the advancement of urbanization, substations go deep into load centers, and fixed equipment such as transformers in substations have become one of the main sources of urban noise
In order to achieve the goal of power transformer vibration reduction and noise reduction, it is more effective and economical to suppress the vibration of oil tank and achieve the purpose of transformer noise reduction
Xu Xingshuai proposed that steel plates should be added to the surface of transformer oil tank, and the air damping film formed between the steel plates and the oil tank wall should be used to reduce the vibration of oil tank[3]
Summary
With the advancement of urbanization, substations go deep into load centers, and fixed equipment such as transformers in substations have become one of the main sources of urban noise. Xu Xingshuai proposed that steel plates should be added to the surface of transformer oil tank, and the air damping film formed between the steel plates and the oil tank wall should be used to reduce the vibration of oil tank[3]. Another method is to change the structure of transformer oil tank. The purpose of this paper is to put forward a dynamic vibration absorption design scheme for transformer oil tank according to the vibration characteristics and dynamic characteristics of transformer oil tank surface, to suppress the vibration of transformer oil tank wall plate in the form of point distribution, and to provide reference for vibration reduction and noise reduction measures of transformer oil tank. The bending and torsion of the whole oil tank is obvious under the mode shape of the first-order mode, and the other order formations show the bending of the local part of the oil tank Most of the natural vibration modes on the oil tank wall are near the center point of the long side wall plate of the oil tank, which is the best area for applying dynamic vibration absorbers
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