一种直接消除变压器合闸励磁涌流的方法  

A Method to Eliminate the Magnetizing Inrush Current of Energized Transformers

作　　者：何越[1] 林湘宁[1] 黄景光[1] 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电工技术学报》2011年第11期141-149,共9页Transactions of China Electrotechnical Society

基　　金：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

摘　　要：变压器在轻载或者空载的情况下合闸通电,可能导致一次绕组流过励磁涌流。涌流出现的原因在于变压器铁心因合闸角、剩磁等各种条件的综合作用而进入饱和区甚至是深度饱和区。励磁涌流对变压器自身和电网的电能质量都有不利影响,本文提出了一种基于二阶欠阻尼电路和分压器组成的涌流抑制器,来消除变压器合闸时刻出现的励磁涌流。利用三卷变压器的第三绕组,配以"涌流抑制器"来实现施加在三卷变压器的第三绕组上的电压幅值逐渐爬升,同时保证施加在两个绕组上的电压幅值不同、但相位相同,以起到对励磁涌流的抑制作用。仿真结果证实了该方法的正确性和有效性。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.

关 键 词：励磁涌流 第三绕组 涌流抑制器 

分 类 号：TM406[电气工程—电器]