Influence of Additional Loss in the Rotor Surface on Rotor Temperature Field of 1100MW Half-speed Nuclear Power Turbine Generator

Accurately calculation of temperature can truly judge the output of large capacity turbo generator. The copper and core loss of generator is the major factor to determine generator temperature field. And the resistance of coils, an important variable for calculating copper loss, varies with the windings temperature. It is more obviously that the interactions between the resistance and the temperature of windings in the 1100MW nuclear power generator rotor with axial-radial ventilation form, which is because the rotor windings have high thermal coefficient of imbalance in this ventilation form. Thence, the rotor temperature field is calculated by the finite volume method considering varied rotor surface loss. Based on the first calculation results, the new resistance in the calculated temperature of coils is used to secondly calculate rotor temperature filed until the resistance match with the coils temperature. The results between initial calculation and iterative calculation are comparatively studied, which can provide theoretical guidance for precisely calculating iron core loss and generator temperature field.