IEC 61400-1-2019 Wind energy generation systems – Part 1: Design requirements.
5 Principal elements
5.1 General
The engineering and technical requirements to ensure the safety of the structural, mechanical, electrical and control systems of the wind turbine are given in the following clauses. This specification of requirements applies to the design, manufacture, installation and manuals for operation and maintenance of a wind turbine and the associated quality management process. In addition, safety procedures, which have been established in the various practices that are used in the installation, operation and maintenance of wind turbine, are taken into account.
5.2 Design methods
This document requires the use of an aeroelastic dynamics model to predict design loads. Such a model shall be used to determine the loads over a range of wind speeds, using the turbulence conditions and other wind conditions defined in Clause 6 and design situations defined in Clause 7. All relevant combinations of external conditions and design situations shall be analysed. A minimum set of such combinations has been defined as load cases in this document. Data from full scale testing of a wind turbine shall be used to increase confidence in predicted design values and to verify structural dynamics models and design situations as specified in 7.2. Verification of the adequacy of the design shall be made by calculation and/or by testing. If test results are used in this verification, the external conditions during the test shall be shown to reflect the characteristic values and design situations defined in this document. The selection of test conditions, including the test loads, shall take account of the relevant safety factors.
5.3 Safety classes
A wind turbine shall be designed according to one of the following two safety classes:
• a normal safety class which applies when a failure results in risk of personal injury or other social or economic consequence;
• a special safety class that applies when the safety requirements are determined by local regulations and/or the safety requirements are agreed between the manufacturer and the customer. Partial safety factors, for normal safety class wind turbines, are specified in 7.6. Partial safety factors for special safety class wind turbines shall be agreed between the manufacturer and the customer. A wind turbine designed according to a special safety class shall be classified as a class S wind turbine, as defined in 6.2.
5.4 Quality assurance
Quality assurance shall be an integral part of the design, procurement, manufacture, installation, operation and maintenance of the wind turbines and all their components.
It is recommended that the quality system comply with the requirements of ISO 9001 .IEC 61400-1 pf download.