An integrated approach for the calculation of losses and temperatures in the end-region of large turbine generators

The finite-element method is applied to the design of the stator end-packets, the copper screen, and the clamping plate of a 1000 MW two-pole generator. The methods used are described, the results for flux density, loss intensity, and temperature distributions at the rated output and a leading power factor of 0.95 are presented. The results provide insight into the phenomena occurring in the end-region of a large turbine generator and emphasize the significance of axial fluxes from end-heating considerations. The influence of some of the design parameters (for example, the width of stator packets) in controlling the packet temperatures is explained. The technique is validated from measurements on a 660 MW generator of a modern design, and the resulting good correlation shows that the techniques presented are reliable design tools