BS EN 61400-4:2013

INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and conventions
4 Symbols, abbreviations and units
5 Design for reliability
6 Drivetrain operating conditions and loads
7 Gearbox design, rating, and manufacturing requirements
8 Design verification
9 Operation, service and maintenance requirements
Annex A (informative) - Examples of drivetrain interfaces and
        loads specifications
Annex B (informative) - Gearbox design and manufacturing
        considerations
Annex C (informative) - Bearing design considerations
Annex D (informative) - Considerations for gearbox structural
        elements
Annex E (informative) - Recommendations for lubricant performance
        in wind turbine gearboxes
Annex F (informative) - Design verification documentation
Annex G (informative) - Bearing calculation documentation
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications
Bibliography

Pertains to enclosed speed increasing gearboxes for horizontal axis wind turbine drive trains with a power rating in excess of 500 kW.

IEC 61400-4:2012(E) is applicable to enclosed speed increasing gearboxes for horizontal axis wind turbine drivetrains with a power rating in excess of 500 kW. This standard applies to wind turbines installed onshore or offshore. It provides guidance on the analysis of the wind turbine loads in relation to the design of the gear and gearbox elements. The gearing elements covered by this standard include such gears as spur, helical or double helical and their combinations in parallel and epicyclic arrangements in the main power path. The standard is based on gearbox designs using rolling element bearings. Also included is guidance on the engineering of shafts, shaft hub interfaces, bearings and the gear case structure in the development of a fully integrated design that meets the rigours of the operating conditions. Lubrication of the transmission is covered along with prototype and production testing. Finally, guidance is provided on the operation and maintenance of the gearbox.