Library filed under Structural Failure

Gearbox fault halts wind turbines

Repair work is due to begin this week on a wind farm off the coast of Kent which has seen a third of its turbines grind to a halt since early December. Of the 36 turbines erected off Herne Bay - on the Kentish Flats - 12 have experienced gearbox problems. Four have been repaired but the others have been running at reduced efficiency pending a break in the weather. The Danish firm Vestas, which owns and maintains them, said the high failure rate was unusual.
29 Jan 2007

Wind turbine topples over: Question is why?

HIGASHIDORI, Aomori Prefecture–The industry ministry Wednesday said it is trying to determine what caused a 68-meter-high wind turbine to collapse earlier this week since strong winds apparently were not blowing at the time. The incident at the Iwaya Wind Farm in the Iwaya district of Higashidori in this northern prefecture is thought to have occurred late Monday, according to officials of Eurus Energy Holdings Corp., which manages the wind farm. While no one was injured, the incident resulted in temporary power outages to homes in the area because power lines were severed.
11 Jan 2007

News on the wind turbine front just keeps coming in

The talk in the local community is that five of the 12 turbines at Toora are now shut down because of equipment failure, the warrantee period has expired and they can't get parts. This wind farm is not particularly old and it's now limping along with a 42% reduction in power output. It's probably a good time to get this junk off the Toora hills....... This mucking around with turbines all adds to the cost of something that is nothing more than a hoax, which would all be pretty funny if it wasn't subsidised by the public purse.
4 Jan 2007

Strong Wind Uncovers Weaknesses - Wind energy installations grew at a record pace in 2005. With the extension of production tax credits, the wind industry is in a boom cycle. However, challenges still buffet the industry.

To continue its rapid growth, wind energy must overcome some major hurdles in the next few years. Market development in the United States is strongly dependent on the federal PTCs, which for now must be periodically renewed by Congress.
1 May 2006

New offshore calamity for Vestas

Great Yarmouth, England. Vestas faces another offshore calamity with faulty turbines in the British Scroby Sands farm. Defects have been found in a bear­ing of the gearboxes of 18 of the 30 V80 machines, the president of Vestas Northern Europe, Tom Pedersen, has confirmed. This is only a year and a half after Vestas was in the headlines with serious flaws in its machines in the Horns Rev farm off the western coast of Denmark. The transformers and gener­ators of all 80 V80 turbines had to be dis­mantled and repaired on land - at a cost of millions for the world wind industry leader.Pedersen says as a precaution the rele­vant bearings will be exchanged in all 30 of the Scroby Sands turbines installed in 2003. No such problems were to be ex­pected with North Hoyle, the UK's first major offshore wind farm, inaugurated in November 2003, because the V80 ma­chines installed there have different types of gears, says Pedersen. But dam­age to bearings similar to that now found at Scroby Sands had occurred in some turbines in the USA and the cause is still being investigated, he added. In addition to the bearings, five generators have to be replaced in Scroby Sands. Pedersen said they'd be taken apart to find the cause. Vestas is lucky inasmuch as the repairs can be done at sea without the nacelles having to be taken down. Weath­er permitting, the repair campaign is to be completed shortly."This is no new Horns Rev," assures Ves­tas man Pedersen. But it's still a bad time for his company to be in the news again with damaged components. As recently as the end of November, Vestas shocked its investors with yet another profit warn­ing, explained as partially due to quality flaws in the products of suppliers."Our philosophy 'failure is not an option' must also be implemented by our suppli­ers,"' Vestas CEO, Ditlev Engel, empha­sised in an interview with us a few weeks ago (new energy 6/2005). Now the res­olute manager can show sooner than he probably bargained for how he intends to assert that principle.
17 Feb 2006

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