变压器局放超声传播FEM仿真分析

摘要

为了分析超声信号在变压器内部复杂环境中的传播规律,建立了三维变压器局放模型.采用有限元方法,对超声信号在变压器内部传播、衰减过程进行了仿真计算.仿真结果表明,超声信号在经过箱壁、绕组、铁芯时,产生折反射,幅值衰减较为严重,通过合理设置多个信号观测点,根据其信号初始峰值大小和到达时间,可判断放电源的大致位置和信号传播的路径.%In order to analyze the propagation law of ultrasonic signals in the complex environment of transformers,this paper establishes a three-dimensional partial discharge model.A simulation calculation of the ultrasonic propagation and attenuation process in a transformer based on the finite element method is also presented.Simulation results demonstrate that ultrasonic signals refract and reflect significant amplitude attenuation when passing through the outer walls,windings and iron core.The reasonable determination of a plurality of signal observation points and use of the initial signal peak amplitude and its arrival time facilitate the determination of the approximate position of the discharge source and the ultrasonic signal propagation path.