Parameter analysis and experimental verification of dynamic vibration absorption design for transformer tank wall

Abstract

Distribution transformer goes deep into the load center, and its vibration and noise problems are becoming more and more prominent. Taking a distribution transformer as object of study, firstly, the vibration analysis model of transformer tank is established, the analysis of oil tank vibration mode is carried out, and obtain the vibration modes of transformer oil tank with different thickness. Secondly, combined with the characteristics of distribution transformer tank wall vibration and vibration source, the design parameters of transformer tank wall vibration absorption are analyzed; Finally, the vibration and noise test of transformer with or without vibration absorber under rated voltage is carried out on the test transformer. The research shows that the vibration mode frequency of transformer oil tank increases linearly with the thickness of tank wall. Blindly increasing the wall thickness will significantly increase the frequency of tank wall, resulting in the same frequency resonance between tank wall and vibration source. Setting single and multiple vibration absorbers on the tank wall can effectively reduce the vibration acceleration of transformer tank wall, but multiple vibration absorber systems are more sensitive to the design parameters. Therefore, Reasonably setting the design stiffness and design quality of the vibration absorber is the key to ensure the function of the tank wall vibration absorber. By adopting a reasonable design scheme, the average vibration reduction on the surface of the oil tank can exceed 20dB. The above research has a good reference for the vibration and noise control of transformer tank wall.