The article presents a protection from single phase earth fault of the stator winding synchronous generator that works in the block with a transformer, whose work is based on the calculation of the current at the place of a single-phase ground fault, by using the combined principle of the imposition of direct current in the circuit that contain insulation windings stator to determine the active resistance of the stator winding insulation to earth, the energy level previously charged capacitor

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... r determining the transition resistance at the site of ground fault, control of voltage of zero-sequence, and consideration of capacitance of stator winding insulation to earth.