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《Transactions of China Electrotechnical Society》 2011-11
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A Method to Eliminate the Magnetizing Inrush Current of Energized Transformers

He Yue Lin Xiangning Huang Jingguang(State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China)  
When transformers are energized under no-load or lightly loaded condition,the inrush current may occur on the primary circuit of the transformers.The magnetizing inrush current is inevitable when the transformer core enters into saturation state or even deep saturation state due to the many factors such as inception angles,residual flux and so on.The magnetizing inrush current has adverse effect both on the transformer itself and the power quality in the power system.A new technique to remove the inrush currents is proposed when the transformers are switched on.Incorporating the "inrush current suppresser(ICS)",it makes use of the tertiary winding of the three-winding transformer to allow the voltage on the tertiary winding climb gradually,and ensures that the voltages on both sides have the same phase,but different magnitudes.In this case,the inrush current can be eliminated successfully.The simulation results show the correctness and effectiveness of the proposed method.
【Fund】: 国家自然科学基金(50837002、50777024);; 国家高技术研究发展计划(863计划)(2008AA05Z214);; 国家重点基础研究发展计划(973计划)(2009CB219700);; 教育部新世纪人才资助项目(NCET-07-0325);; 国家电网公司(SGKJJSKF2008与2009);; 中央高校基本科研业务费专项资金;; 国家大学生创新实践训练计划(0710486037)资助项目
【CateGory Index】: TM407
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