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Frequency of Damage and Related Downtime

 

The reliability of wind turbines and their components is measured not only by their failure rate, but also by the time it takes to restore functionality. However, the reports on repair measures do not relate exclusively to individual assemblies, as repairs are repeatedly required on several assemblies at the same time. In retrospect, it is not always possible to determine which of the damages caused the length of the downtime. The downtimes mentioned here are somewhat blurred due to these possible duplications. 

 

 

 

 Frequency of Damage and Related Downtime

Data source: [WMEP 2006]

 

 

The figure above is taken from the WMEP claims database. This database was established between 1989 and 2006 with the help of the "Scientific Measurement and Evaluation Programme" (WMEP) as part of the "250 MW Wind" programme. During this period, 193,000 monthly energy supply reports and 64,000 reports on maintenance and repair measures for approx. 1,500 wind turbines were collected and analysed. The aim of WMEP was to collect statistically proven empirical values on the practical use of wind energy on a scale relevant to the energy industry and to evaluate them according to uniform criteria. The results of the project still represent one of the few reliable sources of information regarding the reliability of the turbines and their components.