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《Electric Power Automation Equipment》 2013-04
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Converter transformer modeling based on additive process and short circuit fault calculation

ZHANG Jie,WANG Weian,MA Yaqing,TANG Jianzhao,REN Tao(CSR Research Institute of Electricity Technology & Materials Engineering,Zhuzhou 412001,China)  
A digraph of coupled circuit is made for converter transformer,where the transformer is regarded as an electric network containing coupled branches,and based on which,the additive process is applied to directly build the equations of electric network containing coupled branches and the mathematical models of converter transformer in normal condition are thus obtained.For calculating its typical internal and external faults,the mathematical models of converter transformer in the condition of interior fault are obtained by amending the correlative contribution of branches according to the change of nodes and branches.Actual examples validate the correctness of the method of mathematical modeling and fault calculation,which needs less computer memory and has higher computational efficiency,accuracy and versatility.It is suitable for the mathematical modeling of complex multi-winding transformer in normal and interior fault conditions and the calculation of arbitrary internal and external faults.
【Fund】: 国家自然科学基金资助项目(50907018);; 湖南省“十一五”重大科技专项项目(06GK1003-1)~~
【CateGory Index】: TM42
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