Patent ID: 7038330

Claim:
A wind power station comprising: a wind rotor including at least one blade mounted to a rotatable shaft; a transmission having an input shaft mechanically coupled to the rotatable shaft for rotation therewith at a variable input speed, and an output shaft rotating at a variable output speed which is increased at a fixed ratio as compared to the input speed; and an asynchronous generator having a generator rotor mechanically coupled to the output shaft of the transmission for rotation therewith, and a generator stator electrically coupled to a power grid which provides at least one alternating voltage having a grid frequency to the generator, the generator supplying at least one alternating current to the power grid at the grid frequency; wherein a protection unit protecting the generator and the transmission against accidental breakdowns of the at least one alternating voltage provided by the power grid includes: at least one choke electrically arranged between the power grid and the generator stator, and a synchronous electrical machine electrically coupled to the choke.