o overview Article No th to th position Art B3-VH15-B Bevel-helical speed reduction gearbox B3

Flender/Flender Gear Units/Bevel-helical speed reduction gearbox B3

One DAU unit is located in the bottom of the wind turbine tower, another in the nacelle and the third is mounted on the hub it is rotating and transmitting data over RF-link. The serial channel from each DAU is connected to the PC over multi-port serial plug-in board. The selected scan rate of 3 Hz is sufficient for meteorological properties and structural load measurements, but it is far too slow when studying the impact of the wind turbine on the power grid. Thus, another part of the acquisition system works at higher sampling rate (1.8 kHz) on transducer signals originating from the 3 phase voltages and currents at the 6 generator terminals see Figure 1. The signals are connected to signal-conditioning interface that performs sample and hold operation, scales the signals to the 5 level and delivers the conditioned signals to 1-bit multi-channel ADC plug-in board in the PC. standard desktop PC is used as the central component of the data acquisition system. The PC is connected to the Internet and thereby to DTU from where it can be operated remotely. Dedicated measurement software has been developed under LabVIEW. Data are collected in 1 minutes intervals and the complete time series plus statistics derived from this series are saved on disk ready for later treatment. The electric power signals are treated differently due to the fast sampling rate. The idea is to aggregate power quality parameters over 1 minutes intervals synchronous with the DAU intervals so atmospheric, mechanical and electrical behaviour directly can be correlated. To diminish the amount of data, on-line data reduction is compulsory. DATA MANAGEMENT The data files with 1-minute statistics are uploaded every 1 minutes to an internal MySQL NORDTANK database located at DTU, using FTP as indicated in Figure 6. Presented at EWEC 2, Athens 2 February 2 March 2 Page 6/8 3.5m FLENDER GRAFFENSTADEN winddata speed reducers/nordtank Temperature ftp 3mCup anemometer Wind vane wind turbine