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Condition Monitoring: Bachmann Develops Low-Emissions CMS for Nordex

Rudolstadt, Germany - German based Bachmann Monitoring GmbH from Rudolstadt has developed a Condition Monitoring System (CMS) with extremely low electromagnetic emissions for the Dutch wind farm "De Drentse Monden en Oostermoer" (DMO).

The special feature of the project is that the wind farm is located near the central antenna field of the “Low-Frequency Array” (LOFAR). This Europe-wide network containing thousands of highly sensitive radio antennas is used by the Netherlands Institute for Radio Astronomy ASTRON to research the universe. To avoid interference with the world’s largest antenna network, electromagnetic emissions from the wind park must be kept to a minimum.

Thus, Nordex as the supplier of the wind turbines (WTGs) asked Bachmann to reduce the emissions of its CMS, normally operating in the range of 30 MHz to 240 MHz, to a level of at least 35 dB below the quasi-peak value. As a result, the CMS is well below the typical statutory limits for electromagnetic interference radiation.

In partnership with turbine manufacturer Nordex Group, whose N131/3900 turbine was built for particularly low interference emissions, Nordex and Bachmann presented a convincing solution to clients Duurzame Energieproductie Exloermond BV, Raedthuys DDM B.V. and Wind Park Oostermoer Exploitatie B.V.

“Our CMS first had to be examined intensively and then adapted to meet this challenging requirement. The emissions are currently far below the legal limits”, says Bachmann Monitoring GmbH Managing Director, Holger Fritsch. Emission values were measured by independent third parties in the test turbine with installed CMS, erected by Nordex last year. ASTRON also confirmed very low electromagnetic emissions from the entire system.

Source: IWR Online, 09 Mar 2020