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《Automation of Electric Power Systems》 2005-06
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Theory Analysis of the Sympathetic Inrush in Operating Transformers

BI Da-qiang , WANG Xiang-heng , LI De-jia , YU Gao-wang , WANG Zan-ji , WANG Wei-jian ( Tsinghua University, Beijing 100084, China) (Nuclear Power Qinshan Joint Venture Company Limited, Haiyan 314300, China) (Protection & Automation Business Dept of XJ Electric Corporation, Xuchang 461000, China)  
A mathematical model is developed for two transformers in parallel and cascade operation to analyze the variation of their flux linkages based on the linearized magnetic circuit. The mathematical representations of flux linkage in the operating and energized transformer are deduced and it is analytically explained that the operating transformer may be saturated and the sympathetic inrush is produced and affected in it, after another adjacent transformer is energized in parallel or in cascade. At the same time, by adopting the piecewise linearized magnetization characteristics, the influences of such factors as the residual flux linkage, switching time, parameters of the connected power line on the amplitude of sympathetic inrush and the time of transformer saturation are further analyzed by numerical simulation. The analytic conclusions are verified by the results obtained. These analyses provide a theoretical basis to the investigation on the mal-operation of transformer differential protection and an understanding of the sympathetic inrush itself.
【Fund】: 许继电力科技基金资助项目~~
【CateGory Index】: TM411
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