tjh290633 wrote:With a wind turbine there may be two options, either feather the blades if they are variable pitch (unlikely) or to turn them into a position where the wind is not driving them, such as side on to the wind instead of facing into it.
TJH
Feathering the blades (pitch control) is used for nearly all modern large wind turbines. Each blde pitches independently and only one out of three is required to bring the turbine to an idle condition (triple redundancy)
Turning the whole nacelle to face out of the wind (yaw control) is used on some small (<5kW) wind turbines but not on large wind turbines.
In the past some large wind turbines have used air brakes either in the form of flaps or more commonly rotating blade tips
So far, there is no evidence that there was a problem with the wind turbines and there is industry speculation that there was an electrical problem related to the connection to shore.