METHOD FOR LOCATING SINGLE-PHASE GROUNDING FAULT OF GENERATOR STATOR WINDING

摘要

Disclosed is a method for locating a single-phase grounding fault of a generator stator winding, including the following steps: (1) collecting three-phase voltages of a generator terminal voltage inductor of a generator to derive a self-produced zero sequence voltage; (2) calculating the fundamental wave amplitude of the three-phase voltages and self-produced zero sequence voltage and comparing the magnitude of the three-phase voltages, wherein one phase with the lowest voltage is the grounding fault phase; and (3) calculating the grounding transit resistance of the grounding fault phase to obtain a location relationship with a neutral point at the grounding fault place, so as to determine the grounding fault location. The locating method does not need injected stator grounding protection but only needs generator three-phase voltages to calculate and obtain the fault location, which is simple to operate, highly efficient and convenient for on-site troubleshooting.