The anemometer measures the wind speed and notifies the wind turbine controller when it is so windy that it would be profitable to use power to make wind turbine turn (yaw) into the wind and start running.
It is important to know how much wind there is.
If the wind is too strong the wind turbine can break.
|This is why the wind turbine is brought to a stop when the wind exceeds 25 metres per second.
When the wind drops, the anemometer tells the controller that it is OK to start the turbine again.