![]() ![]() Requirements for design, operation and maintenance (British Standard) Lubrication of the gearbox is covered along with prototype and production testing.īS EN 50308:2004 Wind turbines. Guidance is included on the specification of shafts, shaft interfaces and fits, bearings and gear housing structure. Plain bearings are permissible, although their use and rating is not covered. The standard applies to designs using rolling element bearings. The gearing elements referenced include spur, helical or double helical and their combinations in parallel and epicyclic arrangements in the main power path. Furthermore, this method provides a means to evaluate designs based upon gearbox lifetime economics. A standardized method for calculating gearbox reliability is included which allows for an objective comparison of different gearbox designs. The standard provides guidance on the application of the wind turbine loads in relationship to the design of gears and gearbox elements. This standard applies to modular and integrated designs. This applies to wind turbines installed both onshore and offshore. SCOPE This standard is applicable to enclosed speed increasing gearboxes for horizontal axis wind turbine drivetrains with a power rating in excess of 500 kW. Annex information is supplied on wind turbine architecture, wind turbine load description, quality assurance, operation and maintenance, minimum purchaser gearbox manufacturer ordering data, lubrication selection and monitoring, determination of an application factor from a load spectrum using the equivalent torque, and bearing stress calculations. It provides information for specifying, selecting, designing, manufacturing, testing, procuring, operating and maintaining reliable speed increasing gearboxes for wind turbine generator system service. This standard is intended to apply to wind turbine gearboxes. Even if electrical overhead lines are covered by IEC standards, designers can use this document for the mast structures to overhead lines (which are not covered by IEC standards) if they so wish.ĪNSI/AGMA 6006-B20 Standard for Design and Specifications of Gearboxes for Wind Turbines Also, in many cases, only parts of structures are to be designed for ice loads because they are more vulnerable to unforeseen ice than is the whole structure. NOTE Some typical types of structure are mentioned, but other types can also be considered by designers by thinking in terms of which type of structure is sensitive to unforeseen ice, and act thereafter. This document is intended to be used in conjunction with ISO 2394. Atmospheric icing on electrical overhead lines is covered by IEC (International Electrotechnical Commission) standards. rope ways (cable railways) - structures for ski-lifts - buildings or parts of them exposed to potential icing - towers for special types of construction such as transmission lines, wind turbines, etc. ISO 12494:2017 is intended for use in determining ice mass and wind load on the iced structure for the following types of structure: - masts - towers - antennas and antenna structures - cables, stays, guy ropes, etc. In particular, the action of wind can be increased considerably due to both increased exposed area and increased drag coefficient. CAUTION It is extremely important to design for some ice instead of no ice, and then the question of whether the amount of ice was correct is of less importance. Using such an estimate in the structural design will result in a much safer structure than designing without any considerations for problems due to ice. Even in such cases, this document can be useful because local meteorologists or other experienced persons should be able to, on the safe side, estimate a proper ice class. For many areas, however, no information is available. ![]() Information about the degree of normal icing amounts (= ice classes) for the site in question is used. The practical use of all data in this document is based upon certain knowledge of the site of the structure. However, it is the user's responsibility to carefully consider the applicability of this document to the structure in question. In cases where a certain structure is not directly covered by this or another standard or recommendation, designers can use the intentions of this document. ![]() ISO 12494:2017 describes the general principles of determining ice load on structures of the types listed in this clause. ISO 12494:2017 Atmospheric icing of structures
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