| Powerformer is a new type of high-voltage generator. The stator windings of Powerformer are XLPE cables. The windings have cylindrical cross-section. An even electric field distribution is produced around the circular conductor yields. An uneven electric field distribution is produced around the rectangular conductor of the conventional generator yields. The design philosophy of the conventional generator has prevented the output voltage from exceeding 36kV. But the circular conductor can overcome this disadvantage. The use of circular conductor has made it impossible to increase the output voltage of the generator to the grid voltage level. So Powerformer is directly connected with the power network without the step-up transformer. Compared with the conventional generator, Powerformer has the advantages of low cost, high efficiency and low maintenance, so it has the wide developing prospect in the future.Electromagnetic field and temperature field of the 130kW Powerformer prototype is analyzed and calculated by the finite element method in this paper.The developing background and study state at home and abroad are introduced in this paper, and the significance of electromagnetic field and temperature field research for large synchronous generator and Powerformer is analyzed detailed.Then, the 2D electromagnetic field model of Powerformer is established in this paper. The model is analyzed by using finite element method. The electromagnetic field distribution of Powerformer under no load operation and rated operation are obtained. Finally, temperature fields of Powerformer of stator and rotor under rated operation is analyzed, a 3D temperature model of stator and rotor are established respectively, the model is analyzed by using finite element method. The temperature distribution of stator and rotor are obtained. Then the calculation results by using finite element method and experimental data are compared and analyzed, the corresponding results are obtained.
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