Research on radial nonlinear vibration model and distribution characteristics of converter transformer windings
The multi-layer winding structure of the radial converter transformer grid side-valve side-voltage regula-ting winding is closely connected.When the windings vibrate,a coupling vibration effect will occur between the structures,thus affecting the vibration response characteristics of the box.At present,the theory of coupled vibra-tion of winding radial structures is not perfect,and the relevant vibration models cannot effectively explain the multi-frequency response phenomenon when windings vibrate.To solve the above problems,this paper considers the structural coupling effect in the generation and transmission path of winding vibration,simplifies the coupled vi-bration process into the arch winding vibration problem under the action of simple harmonic load excitation,and then proposes a nonlinear vibration model of winding radial coupled vibration.The multi-scale method is used to derive the mathematical expression of coupled vibration acceleration,and the correctness of the model is proved through theoretical analysis and experiments.The research results show that under the excitation of 50 Hz power frequency current,the main frequency of winding vibration is concentrated at 100 Hz.Under the action of structur-al coupling,multi-octave harmonic components such as 200 Hz and 300 Hz appear,and there are also a small number of odd harmonics of 50 Hz such as 150 Hz and 250 Hz.The research conclusions provide theoretical refer-ences for engineering applications such as converter transformer vibration detection technology and structural vibra-tion and noise reduction design.
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