Stator grounding is the most common fault of large generator. If the accurate coil of the fault can be located quickly and effectively

the maintenance progress of the generator can be greatly speed up

and the fault generator can be put back into use as soon as possible. For this purpose

a stator grounding fault location method for large steam turbine generator is proposed

which takes the distribution of winding potential into account. Firstly

the fault characteristics and the influence of winding potential distribution are analyzed when single-phase ground fault occurs in large generator

and the amplitude equation and phase equation of zero sequence voltage are constructed. On this basis

the potential distribution of stator winding can be analytically expressed

so the fault location can be directly calculated by numerical solution method. Simulation analysis result verifies the effectiveness of the proposed method.