Research On Calculations Of Large Turbine Generator Temperature Rise

As the increase of generator design capacity, its electrical parameters and lossesalso increase obviously. As a result, it is necessary to calculate generator temperaturerises. And temperature rises should be limited to some range, in order to insuregenerator safe operation.Firstly, this article calculates and analyses generator heat source, such asexcitation current and flux density, which are related to rotor copper loss and statoriron loss closely. It is essential to derive their accurate values to ensure the reliabilityof calculated generator temperature rises. Finite element method is adopted tocalculate generator excitation current and stator flux density.Secondly, according to generator various heat exchange types and coolingmethods, equivalent thermal network method is adopted to calculate generatortemperature rises, with the finite element calculation results such as excitation currentand flux density as the inputs of temperature rise calculation programs.Finally, temperature rise test theory and application are also studied. Temperaturedetection method, test method and test data process are all included. In the last,calculated values are verified by comparing test data and calculated values. Soequivalent thermal network method is effective on Turbine generator, and it can beused as a common method for temperature rise calculation of other same typegenerators.