The principle of pneumatic brake

Some wind turbines operating under no load in a storm show that the forces acting on a wind turbine with blades are large when the speed is increased.
Towers collapse due to overload, and in some cases the blades deform or break.
In emergency situations such as zero shaft torque and mechanical brake failure, the air brake can reduce the speed. It is activated when the speed increases, and any mechanical device can be used as long as the air brake is activated.
In fact, the use of mechanical devices with high reliability, often use a centrifugal mechanism.
The air brake will not start, which will result in fatal results.
The disadvantage of the central air brake is that some kind of device is required to transmit the release signal to the air brake. This link can be a weakness, and failure of this link can lead to unexpected failures.
A release air brake with a release device is constructed separately from its nearby activation device.
Because of the large number of release devices, the probability of at least one air brake being activated is greater. Since the centrifugal force increases in proportion to the radius, if the centrifugal force is used as the release standard, the position greater than the radius has an advantage.