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《Automation of Electric Power Systems》 2006-06
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Correlation Analysis of Waveforms in Non-saturation Zone Based Method to Identify Magnetizing Inrush in Transformer

BI Da-qiang , ZHANG Xiang-an , YANG Hui-hong , YU Gao-wang , WANG Xiang-heng1 , WANG Wei-jian ( State Key Lab of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China) (Protection & Automation Business Dept of XJ Electric Corporation, Xuchang 461000, China)  
A novel algorithm based on the correlation analysis of waveforms to distinguish between magnetizing inrush and short-circuit fault current is proposed. In the proposed algorithm, the non-saturation zone of transformer is decided by comparing the algebraic sum of sampling data in a short slide window of differential current under magnetizing inrush and short-circuit fault, then two kinds of standard sinusoidal waveform are structured according to the value and position of peak point of differential current in the non-saturation zone. The correlation coefficients between the sampling waveform and two structured sinusoidal waveforms are calculated, and the magnetizing inrush or fault current is decided according to the average of correlation coefficients. Experimental results verify that the method can correctly switch on the differential protection in short time for the internal short-circuit fault in operation and energizing with turn-to-turn short-circuit, and reliably block the protection during the magnetizing inrush. The method can block the differential protection in split-phase, and is of good capability being immune to the saturation of current transformer.
【Fund】: 国家自然科学基金资助项目(50507014) 许继电力科技基金资助项目。~~
【CateGory Index】: TM407
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