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WT 8091/10 (extract from WT 8090/10)
Page 1 of 2
Summary of results of the noise emission measurement, in accordance with IEC 61400-11, of a WTGS of the type
REpower 3.4M 104 Customer:
Date of Order:
Galmsbüll (Turbine No. 300.003)
Site:
REpower Systems AG Albert-Betz-Str. 1 24783 Osterrönfeld Germany
Contractor:
WINDTEST Kaiser-Wilhelm-Koog GmbH Sommerdeich 14 b 25709 Kaiser-Wilhelm-Koog Germany
2010-11-09
Order No.:
4285 09 05754 252
Extracts from this report may only be reproduced with the written permission of WINDTEST Kaiser-Wilhelm-Koog GmbH. This report consists of 2 pages in total.
Wind Turbine Technical Data: Type: ........................................................................REpower 3.4M 104 Manufacturer:......................................................REpower Systems AG Turbine serial number:...............................................................300.003 Rated power:............................................................................ 3370 kW Power control: .................................................................................pitch Tower type: ..................................................................... tubular/conical Rotor manufacturer:...............................................PowerBlades GmbH Rotor blade type:.........................................................................RE50.8 Rotor blade serial number: .......................................... 0011/0012/0013 Rotor diameter: .............................................................................104 m Rotor blade pitch angle (degrees): ............................................variabel Number of rotor blades: ........................................................................3 Rotor speed(s) (or range): ............................................. 6,9 - 13,8 min-1 Gearbox manufacturer:..............................................................Eickhoff Gearbox type: .....................................EBN 2525 A03R01A/G53645XA Gearbox serial numbers: ..............................................................23616 Generator manufacturer: .......................................................... Winergy Generator type: ....................................................... JFRA-630MR-06A1 Generator serial number: .........................................................5147738 Generator speed(s) (or range):...................................... 600-1200 min-1 Generator rated power:............................................................ 3589 kW These data do not replace the corresponding manufacturer’s certificate.
REpower Dokumenten-Nummer
Rev.
D-3.1-VM.SM.03-D
A
Freigabe
Datum
S. Bigalke
2010-05-11
-EN
Measurement geometry: Hub height above ground:.......................................................... 80 m Measurement distance R0:...................................................... 120 m Height of microphone hA: ............................................................ 0 m Distance rotor centre to tower axis d: .................................... 4,23 m
Measurement conditions: Measurement date(s): ..................................................... 2010-04-01 Range of wind speed at 10m height, 1-min average WS10m:..................................................5,5 - 11,0 m/s Wind direction: ..........................................................................WSW Range of power, 1-min-average Pw el:...................... 2866 - 3413 kW Air pressure pLuft:...................................................... 998 - 1002 hPa Air temperature TLuft: ...................................................... 4,2 - 7,1 °C Turbulence intensity: ..............................................................14,1 %
Power curve: From report: DEWI W-PV 09-003.1.A Testing Auth.: DEWI GmbH Measurement Period: 2009-05-20 - 2009-07-13 WS (m/s) 2,07 2,49 3,03 3,46 4,02 4,52 5,00 5,53 6,04 6,49 7,01
Power (kW) -4,95 -5,28 0,23 24,05 89,71 150,98 239,95 370,83 487,01 626,83 798,07
WS (m/s) 7,51 8,00 8,49 9,01 9,47 10,00 10,46 11,01 11,50 12,02 12,51
Power (kW) WS (m/s) 1024,74 1209,62 1474,97 1814,70 2056,48 2303,86 2515,73 2864,85 3055,63 3205,83 3300,00
Power (kW)
13,01 13,50 14,00 14,48 15,05 15,50 15,98 16,55 16,94 17,52 18,00
3353,96 3396,26 3408,87 3432,91 3429,10 3428,33 3430,79 3426,74 3424,61 3427,48 3421,64
Determination of the sound power level: WS10m
6
7
8
9
10
1402
2186
2915
3302
3407
-
105,0
103,9
103,1
103,0
-
1,2
1,2
1,1
1,1
[m/s] PW el [kW] LWA [dB] UC [dB]
WT 8091/10 (extract from WT8090/10)
Page 2 of 2
Summary of results of the noise emission measurement, in accordance with IEC 6140061400-11, of a WTGS of the type REpower 3.4 3.4M 104
Recalculation of LWA for different hub heights in dB(A) (WS at a height of 10 m) **: Hub height [m]
LWA (6 m/s)
LWA (7 m/s)
LWA (8 m/s)
LWA (9 m/s)
LWA (10 m/s)
78,0
-
105,1
103,9
103,2
103,1
96,5
-
104,8
103,9
102,8
102,9
100,0
-
104,7
103,9
102,8
102,9
**
A direct recalculation of the tonality is not possible, as other acoustic effects may arise due to the different length of the tower.
Third octave sound power spectrum in dB(A) for the wind speed in 10 m height corresponding to the maximum sound power level given on page 1: 1/3 octave freq. [Hz] LWA (7,0 m/s) 1/3 octave freq. [Hz] LWA (7,0 m/s)
50
63
80
100
125
160
200
250
315
400
500
630
76,1
79,0
81,5
88,1
89,1
88,7
90,8
93,3
94,4
94,6
96,0
95,3
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
95,6
94,9
93,5
92,6
89,7
87,3
84,8
81,1
76,6
70,0
63,6
58,2
Tonality according to IEC 61400-11/Ed.2: Representative FFT - Spectra (left 8 m/s and right 10 m/s at a height of 10 m):
WS in 10 m height [m/s]
6,0
7,0
8,0
9,0
10,0
Freq. of most prevalent tone, f [Hz]
-
112
112
112
112
Tonality, ∆Lk [dB]
-
-3,45
-6,79
-2,77
-2,40
Audibility, ∆La,k [dB]
-
-1,44
-4,78
-0,76
-0,39
Remarks: For lack of values at the 6 m/s bin, it was not possible to perform the analysis for this bin. Checked:
________________________ Dipl.-Ing. K. Buchmann Head of Department Acoustics & Inspections
Kaiser-Wilhelm-Koog, 2010-06-01
Engineer:
________________________ Dipl.-Ing. J. Dedert