Patent ID: 6520737
Filing Date: 2003-02-18
Classification: F03D,F05B,F16L,Y02E,Y10S

Abstract:
An off-shore wind turbine comprisinga stationary part including a tower extending substantially vertically, a nacelle comprising a wind rotor having at least one blade arranged on a main shaft having a substantially horizontal rotation axis, and a power transmission system, a yawing system comprising a stationary part being fixed to an upper end of the tower and a movable part being fixed to the nacelle, the stationary part and the movable part being designed so that the nacelle is being supported vertically and horizontally by the tower and may pivot relatively to the tower about a substantially vertical yawing axis, and a cooling system for transferring excessive heat from the power transmission system to seawater surrounding the wind turbine, the cooling system comprising first conduction means for conducting a flow of cooling liquid from the stationary part of the wind turbine and to the nacelle during normal operational conditions and at most positions of the nacelle relative to the tower, pumping means for pumping the flow of cooling liquid through the first conducting means and first heat exchanging means for transferring heat from the power transmission system to the cooling liquid.