Prediction of Core Losses of Three-Phase Distribution Transformer  

作　　者：Mihail Digalovski Krste Najdenkoski Goran Rafajlovski 

机构地区：[1]Faculty of Electrical Engineering and lnformation Technologies, Karpos II, bb, Skopje 1000, Republic of Macedonia

出　　处：《Journal of Energy and Power Engineering》2013年第12期2347-2353,共7页能源与动力工程（美国大卫英文）

摘　　要：Transformers are normally designed and built for use at rated frequency and sinusoidal load current. A non-linear load on a transformer leads to harmonic power losses which cause increased operational costs and additional heating in transformer parts. It leads to higher losses, early fatigue of insulation, premature failure and reduction of the useful life of the transformer. To prevent these problems, the rated capacity of transformer which supplies harmonic loads must be reduced. In this work, a typical 50 kVA three-phase distribution transformer with real practical parameters is taken under non-linear loads generated due to domestic loads. The core losses is evaluated using the three dimensional model of the transformer developed in FEM （finite element method） program based on valid model of transformer under high harmonic conditions. And finally a relation associated with core losses and amplitude of high harmonic order are reviewed ＆ analyzed and then a comparison is being carried out on the results obtained by different excitation current in transformer windings.

关 键 词：Core losses three-phase transformer HARMONIC 3D model finite element method magnetic flux distribution. 

分 类 号：TM421[电气工程—电器] TN606[电子电信—电路与系统]