Make:

wow. now that is something you definately don't want to make !

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looks like the failure point was one of the blades, wonder if the blades were stronger if it could take the forces.

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I thought the blades were supposed to feather when the wind speed got above a certain point, that or the generator is supposed to switch to a mode which effectively retards and stops the fan assembly.

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apparently it was a runaway and they set up the camera knowing it was likely to self destruct. Pretty impressive.

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As I understand it, this 'mill was 20-30 years old, and did not have all of the modern safety and redundancies. The brakes failed, and it would have survived if not for the overspeed.

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couldn't they just load it heavily, increasing the torque required to get it to a certain RPM? that's how a lot of home-brew wind generators are made safe - short the generator. inverse electromagnetic currents are set up in the generator which basically act as a brake.

i'm guessing that the physical brake system failed, not an electromagnetic braking system.

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Here's a thought... I wonder if the blade tips went supersonic? That could possibly cause the disintegration, and it's not outside the realm of possibility that they reached speeds like that.

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@ feathering blades
@ loading the genny

Feathering isn't always controlled automatically. Often a base station sends a command for the turbine to yaw out of the wind. If communications had been severed from the weather station it wouldn't receive that command.

overloading this generator could be as catastrophic as the blades disintegrating. Overloading would result in many hundreds of amps coursing through wire not designed for it...

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It seems many viewers (at other sites) see this as a reason not to build massive wind turbines. I think this shows just how much energy is available in the wind.

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@noah

No kidding. Ever been in the turbine hall of a steam plant? A truly awesome amount of kinetic energy going on there. Scary to think how far the parts would fly in the event of a catastrophic failure.

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It was the safety system of the windmill that failed, which should have stopped it once the winds reached such speeds, and they knew it was going to happen.. (happened here in Denmark, where i live)
It was one of the neighbours that recorded it..

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If you shorted out the electrics, all that would happen is the gearbox would have sheared the teeth off, and then the blades would have had no resistance at all to slow them, thus ensuring that they frag.

A better way to deal with this is to steer the blades so they are not directly into the wind, so the felt windspeed is reduced.

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@noah

Just show them what happens when the brakes on a nuclear reactor fail ;)

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Just moved to the midwest recently and saw my first wind turbine...I had no clue that were that huge! And to see one fly apart...just incredible.

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