Adaption-based selective stator ground protection method

The invention relates to the field of relay protection, and discloses an adaption-based selective stator ground protection method, which solves the limited selectivity, low sensitivity, and low reliability of a stator ground protection scheme in the prior art. The method includes: determining whether a ground fault occurs according to the magnitude of an acquired zero-sequence voltage; when a ground fault occurs, determining whether to perform the stator ground protection according to a direction criterion: acquiring the zero-sequence voltage and the zero-sequence current at a generator end toobtain an angle [gamma] between two vectors, and performing a tripping operation when the angle [gamma] is in an action zone; and not performing protection when the angle [gamma] is outside the action zone, wherein the operation sensitivity angle [phi] in the direction criterion is determined in such a way that by acquiring the position of a generator exit circuit breaker and determining a main wiring operation mode base