Re: Storm and wind turbines.
- From: "Enzo Matrix" <enzo55@xxxxxxxxxxx>
- Date: Mon, 10 Mar 2008 19:25:55 -0000
Richard Brooks wrote:
Watching the local news the reported said that if the wind speed
increased too much, the wind turbine would shut down.
It doesn't shut down in the way you are thinking. The blades do not come to
a halt. That would provide too much stress on the blade mountings. The
turbine is simply disconnected from the generator
Why didn't they think of installing something akin to a variable pitch
screw so that if the wind was greater, the pitch of the turbine blades
increased?
They do have that sort of system. It is intended to produce a constant speed
of rotation at the optimum efficiency of the generator. However in a very
high wind, that optimum speed will be exceeded even if the blade is set to
its minimum pitch. If the blades were left connected to the generator in
overspeed conditions they could damage it. That is why they are
disconnected. They can even be disconnected in conditions where generator
efficiency falls below a certain level.
--
Enzo
I wear the cheese. It does not wear me.
.
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