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PICList Thread
'[TECH]:: Bad day for Wind Turbines'
2010\07\19@233433 by RussellMc

face picon face
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Link is to 16 somewhat artistic photos of large wind turbines on fire
or the results of the fires.

These came via email. Brief text suggested lubrication failures and
that may be the major cause, but photo 6 had some German text which
suggested lightning strke as "root cause". End result was about the
same as in all the other cases.

One photo, not obviously contrived, shows a vehicle-blade impact which
demonstrates the very large size of the blades, the relative weakness
of motor vehicles and why you want to have your insurances paid up to
date.
Worth a look even if WT's are not a strong interest.

           http://bit.ly/BadDayForWindTurbines

Putting this in TECH rather than OT as it highlights a side of
technology which may be less obvious.
When you have unattended  2 MW + power units with suitable gearboxes,
lubrication failures that aren't caught early may lead to
'interesting' results. These are certainly all interesting.

Presumably and hopefully the 'ute driver was absent at the time of
blade arrival.

I like the image against a dark sky of cascading ribbons of fire which
look somewhat like lighning but presumably are burning lubricating
oil.

Possibly useful comment on photo uploading:

These photos were all embedded in a single email.
Fotki allows email uploading.
I created a new album with an email access code (very easy and fast)
and sent the email to the assigned address - instant upload of all 16
photos.
Fotki is free for lower res photos (such as all these) and charges a
modest annual sum for unlimited full resolution storage.


:


 Russell

____________________

Ref: Jeff F

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2010\07\20@085522 by Carl Denk

flavicon
face
I understand that the electrical arcing in the bearings (ball and
roller) creates a surface defect and possibly local metallurgical
defects that then some time later cause bearing failure. I can't recall
the application where I became familiar with this phenomenon, but might
have been aircraft.

2010\07\20@103800 by Alan B Pearce

face picon face
> Link is to 16 somewhat artistic photos of large wind turbines on fire
> or the results of the fires.

Hmm, Vestas (the name on the van in one of the photos) are manufacturers
of wind turbines on the continent, and in development of wind turbine
blades that use 'stealth technology' as used on aircraft, to make the
moving blades invisible to radar to get around problems with them
appearing on air traffic control radar screens. Apparently the work is
being done in partnership with Qinetiq
<http://en.wikipedia.org/wiki/QinetiQ> a commercial spinout from the UK
defence research section.
--
Scanned by iCritical.

2010\07\20@141525 by Bob Axtell

face picon face
RussellMc wrote:
{Quote hidden}

Russell, about a year ago I went to a solar/wind conference in Las
Vegas. One speaker discussed the
considerable failures of wind turbines worldwide. The failures are not
well-under4stood, but the damage is sometimes breath-taking. Some
underwriters have become less enthusiastic about wind and are looking
more closely at solar PV,
which seems to be making great strides of late.

--Bob A

2010\07\20@174805 by Spehro Pefhany

picon face
At 11:34 PM 7/19/2010, you wrote:
>Link is to 16 somewhat artistic photos of large wind turbines on fire
>or the results of the fires.

Unpleasant. There's also this failure mode:
http://www.youtube.com/watch?v=u14tBwO5QVQ

A substantial fraction of the San Gorgonio Pass Wind farm (near
Palm Springs CA) seems to be out of service every time I drive
through. It's a rather special place, and the wind typically is
whistling through when it's not so windy elsewhere.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



2010\07\21@220209 by Vitaliy

face
flavicon
face
What's with the Meerkat?

2010\07\21@222515 by RussellMc

face picon face
> What's with the Meerkat?

Consider:

- What Meerkats' traditional stereotypical role is, especially in photos
- Where the photo is in the sequence.
- Where the Meerkat is looking (especially in thumbnail view, but also
generally)
- Title of the Meerkat photo.

:-)

No Meerkats were harmed in the creation of this photo sequence (as far
as I know).
Meerkat was in Singapore. WT's were elsewhere.

FWIW - Meerkat has second to top number of views. 93 compared to photo
1's 95. Photo 2 has 91.



                 Russell

2010\07\21@231700 by Vitaliy

face
flavicon
face

----- Original Message -----
From: "RussellMc" <.....apptechnzKILLspamspam@spam@gmail.com>
To: "Microcontroller discussion list - Public." <piclistspamKILLspammit.edu>
Sent: Wednesday, July 21, 2010 19:24
Subject: Re: [TECH]:: Bad day for Wind Turbines


>> What's with the Meerkat?
>
> Consider:
>
> - What Meerkats' traditional stereotypical role is, especially in photos
> - Where the photo is in the sequence.
> - Where the Meerkat is looking (especially in thumbnail view, but also
> generally)
> - Title of the Meerkat photo.

Yeah, I read the description and knew it was there on purpose, but I didn't
know about the traditional sterotypical role. Whatever. :)

2010\07\22@034244 by RussellMc

face picon face
> >> What's with the Meerkat?

> Yeah, I read the description and knew it was there on purpose, but I didn't
> know about the traditional sterotypical role. Whatever. :)

One (or more) from a group is "assigned" to stand guard looking for
trouble or danger while the others do other things. Guard duty is said
to typically last about an hour before another takes their place.
Typical stance is to stand vertically on two legs and tail and scan
the surroundings and sky.

I don't know what they'd make of wind turbines.

                             Russell

________________

eg

They often stand on their rear legs and gaze alertly over the southern
African plains where they live. Mothers can even nurse their young
while standing.
http://animals.nationalgeographic.com/animals/mammals/meerkat/


Meerkats forage in a group with one "sentry" on guard watching for
predators while the others search for food. Sentry duty is usually
approximately an hour long. Baby meerkats do not start foraging for
food until they are about 1 month old, and do so by following an older
member of the group who acts as the pup's tutor.[3] The meerkat
standing guard makes peeping sounds when all is well. If the meerkat
spots danger, it barks loudly or whistles.
http://en.wikipedia.org/wiki/Meerkat

Photo
http://www.fellowearthlings.org/

When on guard duty, there is an entirely different assortment of
sounds employed. These sounds are constant and communicate to everyone
else what is happening during the watch.  When everything is fine, the
sentry emits mellow tones. When a predator is spotted at a distance, a
beeping sound is given, almost like a yellow alert.  If the predator
gets closer, the sound differentiates depending on the type of
predator. The martial eagle tends to get the most frantic alarm even
from great distance.   Meerkats allow some predators to get very close
before they sound the red alert (up to 100 feet from the den).
http://www.meerkats.net/info.htm

2010\07\22@042026 by Matt Rhys-Roberts

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On 20/07/2010 13:55, Carl Denk wrote:
> I understand that the electrical arcing in the bearings (ball and
> roller) creates a surface defect and possibly local metallurgical
> defects that then some time later cause bearing failure. I can't recall
> the application where I became familiar with this phenomenon, but might
> have been aircraft.
>    

(This may be happening on my ageing motorbike, i.e. where the chassis
return current is fed through the steering headrace bearings, causing
some headlamp flicker when I brake hard!)

Would electrically conductive lubricants help the wind turbine problem?
Is it initiated by lightning strike, or reliance on bearings for current
conduction?

Matt

2010\07\22@083339 by Carl Denk

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With what little I know of lubrication technology. It is important to
maintain a film of lubricant between all moving parts. I would assume
"electrically conductive materials" would have to have some metallic
particles unless the relying on electrons moving in a liquid sort of
technology (probably will hear something from the Guru's on this area
:)  ). In the case of the electrons, wouldn't that be similar to a
plating process, which I don't think would be desirable. I'm assuming
that your bike has a friction off the side of the tire generator, using
the frame as one of the conductors. Need to get a "Hummer" (that's a
1960's English bicycle brand) front wheel hub generator. It was the
front wheel hub with a concentric generator stator/rotor. It had 2 wires
to your lights. Worked very well. I drove my Raleigh Gran Prix (1960,
made in England, would be compared for the age to a top of the line Trek
today) in all kinds of Michigan weather with no problems. What are you
using for grease. Get a cartridge (auto grease gun size) of good quality
lithium auto/truck chassis, instead of those little tubes that are
questionable quality. I use shell's

On 7/22/2010 4:17 AM, Matt Rhys-Roberts wrote:
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