Method for operating a wind turbine comprising a drive train driving one or more electrical generators ( 23, 31 ) that supply power to an electric grid ( 11 ), by which, in events that can create a load inversion in the gearbox ( 17 ), a drive train dump load ( 5 ) is activated for ensuring that the drive train torque has a constant direction, avoiding the impact of backlashes in the gearbox ( 17), said dump load ( 5 ) consisting of power absorbed by one or several means chosen among means specifically dedicated to the absorption of said dump load ( 5 ) and means present at the wind turbine for other purposes. The invention also refers to a wind turbine for implementing said method.