Abstract:Large turbo generator is an important part in power systems and its stability directly affects the safe operation of the power system. On the basis of establishing two dimensional electromagnetic field circuit dcondition

and asymmetric operation condition of a 1407MVA turbo generator was further studied in the paper.Firstly

the paper analyzes changes in different conditions and definition calculation method of flux density deviation angle under asymmetrical load of generator.The variation law of the generator magnetic field is studied by the flux density deviation angle. The inner power factor and power angle are calculated under the condition of asymmetric load operation. The paper analyzes the change of inner power factor and power angle.The result indicated that turbo generator not only the magnetic field displacement happened but also the change of inner power factor

power angle happened. The simulation results are consistent with the theoretical analysis.Therefore

it provides with certain theoretical basis for asymmetric operation condition and fault judgment of the generator.