Library filed under Structural Failure from Denmark
Every time a drop of rain hits a wind turbine blade it contributes to a process that ends in small cracks being formed in the leading edge of the blade that eventually ruin the coating on the blade. The bigger the drop, the worse the damage, reports DR Nyheder.
Siemens Gamesa has commenced a blade repair and upgrade campaign at the Anholt offshore wind farm, after signing agreements with Ørsted for these works to be carried out on the Danish offshore wind farm and UK’s London Array, both featuring Siemens Gamesa’s 3.6MW wind turbines that have been affected by leading edge erosion.
Ørsted must repair up to 2,000 wind turbine blades because the leading edge of the blades has worn down after just a few years at sea. The company has a total of 646 wind turbines from Siemens Gamesa each of which may be affected at different degrees, confirms Ørsted to Finans.
A test version of MHI Vestas' V164 turbine, the world's most powerful wind turbine at 9 megawatts, has caught fire.
A blade has been blown off a Vestas turbine at Bindesbol, western Denmark during storm Urd, local publication Dagbladet Ringkobing-Skjern reported last week.
A large turbine at a Samsø offshore windfarm was wrecked on Saturday, bringing electricity production at the site to a halt. For unknown reasons, the 100-metre-high turbine lost its top part and all of its wings, which then fell into the sea.
"There was a loud bang and then one of the blades span off, and shortly afterwards the gearbox's housing fell to the ground," Henrik Nielsen, one of the officials at the scene.
The blades and gearbox have been spun off a wind turbine in western Jutland after a malfunction allowed it to reach to dangerous speeds in high winds. ..."We cannot get close to it until the wind dies down,” Oluf Jakobsen, from the local Morsø municipality explained on Friday morning. “There’s nothing we can do but sit and wait for the outcome."
The incident involved a single V90-3.0 MW wind turbine, which uses 44-meter-long blades. Two of the blades were damaged ...A developer named Hojstrup Vind ApS owns the wind farm, which features four V90-3.0 MW turbines. The machines were commissioned in December 2013,
Two 44-metre blades have broken on a Vestas V90 3MW turbine commissioned at a Danish wind farm in December. The blades came off “approximately a third of the distance from the tip end” on Sunday at the site close to the town of Sæby in Northern Jutland, Vestas said.
The Danish wind giant is dealing with fallout from a fire on one of its turbine models. A number of operating turbines were paused following the fire, and the company responded to media questions this week.
DENMARK: Horns Rev I, the 160MW offshore wind farm jointly owned by Vattenfall and Dong Energy, has been shut down following a fault in its transformer station.
A construction flaw in the foundations of many sea-based wind turbines was not discovered by inspectors who approved the structures' operation One of the most common foundations for sea-based wind turbines has a critical flaw but was nonetheless approved by a Nordic certification company, reports trade journal Ingeniøren. ...‘It's something no one could foresee and can give any engineer nightmares,' he said.
Following the catastrophic failure of two Vestas wind turbines on Feb 22 and 23, 2008, the Danish energy agency requested an investigation into the events. A report was produced by engineers at Risø DTU. Below is the report translated into English. The original report, in Danish, can be accessed by clicking on the link below. A video of one of the failures can be seen here: http://www.windaction.org/videos/14294 . It is important to note that the debris from the first turbine failure which occurred on February 22 spread as far as 700 meters (2200 feet) away. Risø DTU is formerly a government research institution under the Danish Ministry of Science, Technology and Innovation.
A windmill in Denmark collapsed during a storm in Denmark on Feb 22, 2008. The braking system failed while two technicians worked in the turret at the top. The technicians were able to get out before the collapse. Pieces of the shattered turbine were sent more than 500 meters away. Additional footage can be viewed by clicking here. Duration: 40 seconds
After the industry's recent boom years, wind power providers and experts are now concerned. The facilities may not be as reliable and durable as producers claim. Indeed, with thousands of mishaps, breakdowns and accidents having been reported in recent years, the difficulties seem to be mounting. Gearboxes hiding inside the casings perched on top of the towering masts have short shelf lives, often crapping out before even five years is up. In some cases, fractures form along the rotors, or even in the foundation, after only limited operation. Short circuits or overheated propellers have been known to cause fires. All this despite manufacturers' promises that the turbines would last at least 20 years.