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FEM Simulation Analysis of Ultrasonic Propagation of Partial Discharge in Transformers

GAO Chaofei;LIU Xu;WANG Wei;YU Lei;SHANG Chao;Beijing Key Laboratory of High Voltage & EMC,State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University;Shenyang Power Supply Company,State Grid Liaoning Provincial Power Grid Crop;  
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.
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