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《Power System Technology》 2006-01
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A Multi-Target Method to Locate Internal Partial Discharge Sources within Transformer Based on Array Signal Processing

LUO Ri-cheng1,LI Wei-guo2,LI Cheng-rong2(1.School of Electrical Engineering,Wuhan University,Wuhan 430072,Hubei Province,China;2.Beijing Key Laboratory of High Voltage & EMC(North China Electric Power University),Changping District,Beijing 102206,China)  
A new method to locate multiple discharge sources within transformer by array signal processing is proposed,i.e.two supersonic sensor arrays are installed on inner wall of transformer tank to detect the supersonic signals emitted by partial discharge sources,and using the spatial spectrum estimation theory of array signal processing technology the characteristic information of the signals received by the arrays(number of signal sources,propagation direction,etc.) are analyzed,then the estimation of number of discharge sources,the direction of discharge sources and the distances among discharge sources and sensors are determined respectively,after that the multi-target localization of partial discharge sources is implemented.Simulation results show that the proposed method possesses good resolution and estimation accuracy and can effectively estimate the spatial positions of multiple discharging points within transformer.
【Fund】: 国家自然科学基金资助项目(50477040)~~
【CateGory Index】: TM835
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