Quote:
Originally Posted by JohnnyD
The truth to the above misconception is actually one of the valid reasons *against* Cape Wind. The energy is anything but free. Turbines need to be greased and inspected very regularly. Also, I'm curious what the reliability of the turbines will be with all that salt water getting into all the crevices.
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There should be over a 1-2+ decades of reliability data from European installations (Denmark, Germany, etc)
Table 2. Example of German data extracted from Windstats.
Turbine data 1996
MarchJune SeptemberDecember
No of DE turbines reporting1803 1830 1866 1902
Length of reporting period,
h2160 2134 2203 2208
Subassembly failures
Rotor 168 99 150 140
Air brake 30 31 18 23
Mechanical brake 25 29 18 21
Pitch control 24 42 36 46
Main shaft 9 7 1 18
Gearbox 29 46 56 42
Generator 37 47 48 100
Yaw system 52 43 50 63
Measurement system 419 29 28 90
Electrical controls 141 127 96 125
Electrical system 166 130 163 163
Hydraulics 82 62 58 45
Sensors 43 69 39 60
Other 84 55 91 58
Total subfailures 1314 816 857 999
From:
ScienceDirect - Reliability Engineering & System Safety : Reliability analysis for wind turbines with incomplete failure data collected from after the date of initial installation