The Study Of The Eddy Losses And Temperature Field Of Winding In Power Transformer

The eddy current loss and the partical overheating caused by leakage magnetic for power transformer is very important problem that has never been resolved by far. The larger transformer capability is,the greater leakage magnetic is,the greater the eddy loss is,the more diffcult the problem of partical overheating caused by the eddy loss is resolved .so how to resolved this problem is very important and useful.The large universal finite element software——Ansys is introduced and used inthis paper. Adopted electrical-magnetic and transformer theory, a 2-D leakage magnetic field model of power transformer is built with a lot of simulation analysis for 2-D model of transformer.. On the basis of the accurate analysis for 2-D leakage magnetic field of transformer,the distribution of the magnetic flux density of high voltage winding and low voltage winding is gived , and the distribution of magnetic flux density along radial and axial direction is compared of high voltage winding and low voltage winding . The magnetic flux density of every finite element is also caculated .The eddy current loss of the winding caused by leakage magnetic is caculated accurately by the finite element method,and analyzed combining with the eddy current loss computed by the conventional experience method.Coupling with temperature field on the basis of the total losses of windings, acquired the graph of winding's temperature rise, and analyzed the result by theory . The plan is proposed to improve the distributing of forced-directed area in forced-directed oil cooling transformer , and proved the feasibility of it by theory . The theoretical basis is provided for the design of power transformer.