Patent ID: 8585358

Claim:
A wind turbine generator that generates electric power in such a manner that a rotor head that rotates when receiving wind power with wind turbine blades drives a generator installed inside a nacelle, the nacelle being installed at an upper end of a tower that is vertically erected on a foundation, and the wind turbine generator including a closed-circuit lubricating-oil circulation system in which lubricating oil circulates through devices installed in the nacelle, wherein an air-cooled heat exchanger installed in the lubricating-oil circulation system to cool the lubricating oil by heat exchange with air is provided in a region separate from nacelle air; the region separate from the nacelle air is an air intake-exhaust section formed to communicate with an interior of the nacelle via an opening provided in a wall surface of the nacelle; and a heat insulator is disposed on a wall surface of the air intake-exhaust section.