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《High Voltage Engineering》 2007-08
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Experimental Study on Partial Discharges Localization Within Large Transformer

LUO Ri-cheng1,LI Wei-guo2,WEN Xi-shan3 (1.School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410076,China;2.School of Electrical & Electronic Engineering,North China Electric Power University,Beijing 102206,China;3.School of Electrical Engineering,Wuhan University,Wuhan 430072,China)  
In order to research and realize partial discharge(PD) sources localization within power transformer and to improve the accuracy of localization,a new method is presented in this paper,which is based on spatial spectrum estimation.Two ultrasonic sensor arrays are located on the inner wall of the transformer tank to detect the ultrasonic signal emitted by the partial discharge sources.Spatial spectrum estimation technique and information theoretic criteria are used in analyzing the signal feature information(Direction-of-Arrival(DOA),number of signal etc,and the number of partial discharge signal estimation and direction-of-arrival estimation were accomplished.A uniform linear array(ULA) consisting of 4 isotropic acoustic sensors was developed,a suit of experiment system for partial discharge sources localization testing system was established,and a series of experiments on multiple PD sources localization for single partial discharge source and two partial discharge sources were performed.The results of localization show that: the method can effectively estimate the location parameter of multiple partial discharge sources in a high estimated accuracy and set up solid theoretical and experimental foundation for multiple partial discharge sources localization in large power transformer.
【CateGory Index】: TM835;TM41
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