Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes10-2130
This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions. 
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Volume 10 article 225 pages: 85 - 92

Pantelis N. Botsaris 
Democritus University of Thrace School of Engineering, Vasilissis Sofias 12, Xanthi, Greece

E. I. Konstantinidis 
Democritus University of Thrace School of Engineering, Vasilissis Sofias 12, Xanthi, Greece

D. Pitsa 
Democritus University of Thrace School of Engineering, Vasilissis Sofias 12, Xanthi, Greece

Nowadays, the availability of wind turbines usually approaches the 98%. The objective is to increase the turbines availability, by improving the wind turbine reliability especially for offshore plants. The wind turbines reliability is a pivotal factor in the successfully function of a wind power plant. High reliability can be achieved by understanding and minimizing the failures of the system. Maintenance planning could make maintenance more efficient and could lead to a reduction of failure events. In order to decide the most effective maintenance strategy, it should be identified the most critical components of the wind turbines, which are prone to failures. The maintenance strategy should take into both the reliability improvement and the reduction of maintenance cost. It is es­sential to determine and record the main cause that provokes the failure event. The data logging and statistical processing of failure information could improve the reliability of the system components. A wind turbine is a complex power generating system consisting of several structural, electrical and mechanical components. Its efficiency depends largely on its reliability level. In the present study, the factors that affect the reliability of a wind turbine are presented, as well as the analytical way of calculating its reliability. The reliability analysis of the wind turbine is based on the systemic approach of the wind turbine subsystems, as its total reliability depends directly on the reliability of the subsystems. It is based on a technical analysis of the reliability of com­plex systems. The model used is the Fault Tree Analysis (FTA), which is an identification method for probable causes of system failure. The relation of reliability, maintainability and availability is also presented and explained by the example of a small wind farm.

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The authors wish to thank ROKAS S.A. for pro­viding valuable information regarding the techni­cal characteristics and access to the failure data base of their wind turbines.

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