Study Of Stator End Region Magnetic Field Of Powerformer And Calculation Of Its End Region Leakage Reactance

In this paper,the design characteristics and development situatution of Powerformer are introduced；the structure of prototype is studied,and three dimension end region entity model of Powerformer stator is established；the theory of analyzing end region eddy magnetic field of stator by finite element method is studied；end region magnetic field of stator is analyzed and the numerical value of end region leakage reactance of stator is calculated.Against a prototype which is being produced,its three dimension end region entity model of stator is established,and with the aim of simplifying calculation,the theory of how to simplify entity model is studied,then the theory is made use of, and the end region entity model of stator is simplifi-ed；meshing characteristics of three dimension entity model and shortcomin-gs of end region entity model of stator are studied,then meshing method of three dimension end region entity model of Powerformer stator is studied as well,and the simplified entity model is meshed．With this meshed model,the distribution of end region magnetic field of stator is analyzed,and the magnetic field energy and reactance of Powerformer end region are calculated and compared with design value．Because the prototype is being produced,in this paper,stator core,gap and eddy equipment are not taken into consideration,and this has a little influence on the result,but through analysis,the result is proved to be good．Through the example calculation,it is known that the method of this paper is useful and through theoretic analysis,it is proved that end regionleakage reactance of Powerformer is greater than that of conventional electrical machine．　　The work in this paper has some practical values,and provides a basic theory for completed analysis to the end region magnetic field of Powerfor-mer．...