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The turbines are also well designed in terms of their

acoustic aspects; the sound level generated by the

equipment will not exceed 106.1 dB(A) even under full

load. Moreover, they can be run in a variety of sound-

optimised operating modes, which allows them to be

controlled in such a way as to keep the sound power

level as low as possible, taking into account the wind

direction and time of day.

Safety foremost at all times

For the Wennerstorf project, the Nordex Group left

nothing to chance: from the initial concept develop-

ment and the design of the turbine, the assembly work

and the in-house testing, through to logistics oper­

ations and on-site installation, the team in charge of the

project always paid detailed and scrupulous attention

to all safety-related aspects.

For example, as far back as May, Nordex installed the

entire nacelle together with the drive train and the

hub back at their manufacturing plant in order to car-

ry out internal commissioning. The aim was to reduce

the time required for the subsequent commissioning

on-site, and to confirm that all the steps in the work

procedure can be carried out safely. Similarly, new in-

stallation and transport tools were successfully tested,

while the service team performed software tests and

trialled the inspection procedures.

Filed logistics solutions

In the course of the installation ofWennerstorf , a filed

logistics solution for transporting rotor blades was em-

ployed for the first time. The length of the single-piece

rotor blades called for a new transport concept where

the rotor blade, being the only connecting element

between the front and rear axles, simultaneously per-

formed the function of a conventional low-loader. This

is how the rotor blades travelled the 330 kilometres

from the production facility in Rostock to the transfer

site near the wind farm.

Here they were loaded onto a self-propelled vehicle

fitted with a tilting mechanism that can raise a rotor

blade upwards to an angle of up to 60 degrees. In this

way, travelling at walking pace and guided by remote

control, the rotor blades were easily manoeuvred

through the dense stand of trees and onto the con-

struction site.

The turbines at Wennerstorf are only the beginning.

Patxi Landa, CSO, Nordex Group, says: “We have had

very positive responses from our customers. Thanks

to the N149 / 4.0-4.5, we have already become the pre-

ferred turbine supplier for many projects amounting

to several hundred megawatts. Many customers have

already submitted our turbines for the approval process

– and not only in Europe.”  

In-house manufacture of

single-piece rotor blades

The production of the rotor blades for the N149 / 4.0-

4.5 also began in May. The longest single-piece rotor

blades, which the Nordex Group will be manufacturing

in-house from now on, are over 72 metres in length.

Their design is the result of development work to find

the optimal balance between energy production, costs

and weight.

The rotor diameter of 149 metres contributes signifi-

cantly to the very low power-generation costs and the

high yield of the turbine. As was the case with the

predecessor models, the rotor blades of the N149

are made of carbon and glass fibre. In parallel to

the production of the rotor blades for Wennerstorf ,

bench testing required for certification is also currently

under way.    

At the top: The project team celebrat-

ing the completion of the first NR74.5

rotor blade.

Below: Josef Horber, Falk Mehdorn,

Max Jungk and José Luis Blanco (all

Nordex Group)


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