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Title:
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Betrouwbaarheidsanalyse NedWind 40
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Author(s):
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Published by:
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Publication date:
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ECN
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1996
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ECN report number:
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Document type:
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ECN-C--96-051
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ECN publication
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Number of pages:
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Full text:
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39
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Download PDF
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Abstract:
The experiences with reliability analysis techniques are presented forthe case study: 'NedWind 40: Reliability Analysis and Maintenance
Procedures'. Also methods to collect failure and maintenance data are
discussed. The reliability analysis techniques are described only briefly
because they were performed in accordance with the practical guidelines for
the assessment of wind turbine safety, as drafted in the Joule-II project
'European Wind Turbine Standards'. The analysis showed that these guidelines
are suitable to obtain good results. The analysis procedure comprises the
following steps: (1) description of the wind turbine, its main systems, and
the operational procedures; (2) performance of event sequence analysis; (3)
performance of Failure Modes, Effects, and Criticality Analysis (FMECA); (4)
system modelling; and (5) quantification of system model and event sequences.
The analysis revealed that performing the FMECA is the crucial step in
reliability analysis. Because of this fact, NedWind wants to implement the
FMECA in their 'design reviews' of new wind turbines. The analysis gives a
lot of additional insight in the failure behaviour of the systems. The
quantitative part of the reliability analysis was performed successfully with
generic data from handbooks instead of specific wind turbine failure data,
because the operational experience of the NedWind 40 was too short.
Furthermore, the maintenance sheets did not contain all the information that
was needed for a detailed quantitative analysis. The quantitative analysis
showed that the NedWind 40 is a reliable and safe wind turbine. A general
conclusion is that the availability of control and protection systems can be
improved by applying monitoring, rather then applying components, with a
higher reliability. In order to collect the necessary failure and maintenance
data, a failure registration sheet was developed, together with a database
structure for data storage. Analysis techniques for the failure and
maintenance data were discussed briefly. 2 figs., 8 tabs.
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