A Novel Fault Location Method for Generator Stator Grounding Considering Armature Reaction

Stator grounding fault is very common to the large generator, and the accurate fault location can greatly reduce the time of corrective maintenance. However, this problem can be very hard since the structure of the winding is very complex. In this paper, a fault location method for large generator stator grounding considering armature reaction is proposed. Firstly, the fundamental potential distribution of the stator winding and the influence of armature reaction on the measured voltage are analyzed, and the mathematical relationship among fault position, fundamental potential, fundamental voltage and grounding resistance is then constructed. On this basis, the process of the fault location can be established. Finally, the accuracy and efficiency of the proposed method are verified by extensive experiments performed on PSCAD/EMTDC.