Vibration signal characteristic analysis of power transformer winding under deformation state
In recent years,mechanical failures in domestic power transformer windings have been frequent.Utili-zing vibration analysis to monitor the mechanical operation of power transformer windings can effectively mitigate the risk of transformer failures.This article first analyzes and solves the vibration sources and acceleration theory of power transformer windings,establishes a finite element model of a 110 kV power transformer,studies the vibration characteristics of the transformer windings under rated normal load conditions,and finds that the radial vibration in-tensity of the windings under load conditions is much greater than the axial vibration,with a main frequency of 100 Hz in the winding vibration signal.With fixed constraints at the upper and lower ends of the windings,the vi-bration intensity at the upper and lower ends is less than that in the middle of the windings.Next,by altering the geometric shape of the high-voltage windings to cause buckling deformation,a comparison analysis of the vibration signals in the undeformed state of the windings reveals that when deformation occurs,the vibration signal spectrum shows a significant amount of high-order harmonic components.As the degree of deformation of the windings increa-ses,the main frequency of the vibration signal continuously increases,and the distribution of high-order harmonic components becomes more complex.Finally,by defining characteristic parameters such as the fundamental fre-quency ratio and high-frequency ratio,the article further analyzes the changes in vibration characteristics before and after the deformation of the transformer windings,providing a basis for evaluating the mechanical state of transform-er windings using vibration analysis in actual field conditions.
transformerfinite element simulationwinding deformationvibration signalspectrum analysis
万方数据
维普
