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Rotor parts from the wind turbine prototype crashed

A part of the wind turbine prototype “Vertical Sky A 32” with vertical rotors crashed on the wind test field during gusts. One of the three rotor arms and the 54-meter long rotor blade were in the field. Nobody was injured in the accident.

Part of the wind turbine prototype "Vertical Sky A 32" crashed on the wind test field during gusts. The system in Grevenbroich was only set up in September for extensive testing there.

Neurather heard a big bang on Sunday evening, “as if something big had fallen over,” says Sebastian Draxel. The cause was outside the town on the Frimmersdorfer Höhe. A part of the wind turbine prototype “Vertical Sky A 32” with vertical rotors crashed on the wind test field during gusts. One of the three rotor arms and the 54-meter long rotor blade were in the field. Nobody was injured in the accident.

The new, unusual-looking system was only installed on the test field in September to be extensively tested there. In the 105 meter high prototype, the wind turbine hub is not mounted vertically, as is usual, but horizontally. Three rotor blades spin around them like a carousel. The cause of the accident was still unknown on Monday.

"We are in the process of securing the site for safety," explained Ellen Hahn, spokeswoman for the Neurath company Windtest GmbH, which operates the test field on the Frimmersdorfer Höhe. Then it is necessary to look for the cause... more [truncated due to possible copyright]  

Part of the wind turbine prototype "Vertical Sky A 32" crashed on the wind test field during gusts. The system in Grevenbroich was only set up in September for extensive testing there.

Neurather heard a big bang on Sunday evening, “as if something big had fallen over,” says Sebastian Draxel. The cause was outside the town on the Frimmersdorfer Höhe. A part of the wind turbine prototype “Vertical Sky A 32” with vertical rotors crashed on the wind test field during gusts. One of the three rotor arms and the 54-meter long rotor blade were in the field. Nobody was injured in the accident.

The new, unusual-looking system was only installed on the test field in September to be extensively tested there. In the 105 meter high prototype, the wind turbine hub is not mounted vertically, as is usual, but horizontally. Three rotor blades spin around them like a carousel. The cause of the accident was still unknown on Monday.

"We are in the process of securing the site for safety," explained Ellen Hahn, spokeswoman for the Neurath company Windtest GmbH, which operates the test field on the Frimmersdorfer Höhe. Then it is necessary to look for the cause together with the manufacturer.

“We are surprised,” said Ellen Hahn. As far as she knows, such an accident has not yet occurred on the test field, which went into operation 22 years ago.

In distant Dübendorf in Switzerland, Patrick Richter learned about the incident at around 9 p.m., Richter is the company founder, CEO, and managing director of Agile Wind Power who manufactured of the prototype. "Two employees immediately made their way to Grevenbroich", explains Richter, who "wasn't very happy about the news". “Shortly after 7 p.m., a 13.5 meter long rotor arm broke off about two meters from the hub.” The rotor arm, together with the 54-meter long rotor blade attached, crashed to the ground. “There were gusts, but it wasn't particularly windy,” says Patrick Richter. Fortunately, there were no injuries. "In addition to field damage and the damage to the damaged rotor arm and rotor blade, no further third-party damage was recorded," explains the company Agile Wind Power, in a press release.

The reason for the failure is now the subject of investigation.

"We don't yet know the cause, it's still too early,” says Richter. "A lot is now being checked and reevaluated."

At the beginning of September, the large Vertical Sky A 32 wind turbine was installed on the wind test field in Grevenbroich, after which the commissioning process began. "The system was not yet contributing energy to the grid. In the weeks since September, a number of subsystems had been tested. "We were making very good progress. We were about to complete commissioning. The accident thwarted our plans," explains Patrick Richter.

In spring 2019 he presented the principle of the Vertical Sky A 32 at Windtest in Neurath. He mentioned several advantages of the new technology: The wind turbine with the special arrangement of the hub and rotor blades is about three times quieter than other wind turbines. This means that the Vertical Sky can be built closer to residential areas. A special feature is the rotor blade pitch control. "4000 times a second it checks whether the rotor blades are optimally positioned to the wind," the immediate correction allows a high degree of efficiency at a low rotation speed.

Further advantages according to the manufacturer: Birds should be at a much lower risk of colliding with the rotors. There are many interested parties for Vertical Sky, Richter said yesterday.


Source: https://rp-online.de/nrw/st...

NOV 16 2020
https://www.windaction.org/posts/51979-rotor-parts-from-the-wind-turbine-prototype-crashed
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