IEC 61400-1:2019 pdf free download.Wind energy generation systems – Part 1: Design requirements.
IEC 61400-1:2019 specifies essential design requirements to ensure the structural integrity of wind turbines.
Its purpose is to provide an appropriate level of protection against damage from all hazards during the planned lifetime.
This document is concerned with all subsystems of wind turbines such as control and protection functions, internal electrical systems, mechanical systems and support structures.
This part of EC 61400 outlines minimum design requirements for wind turbines and is not intended for use as a complete design specification or instruction manual.
Any of the requirements of this document may be altered if it can be suitably demonstrated that the safety of the system is not compromised. This provision, however, does not apply to the classification and the associated definitions of external conditions in Clause 6 Compliance with this document does not relieve any person, organization, or corporation from the responsibility of observing other applicable regulations.
This document is not intended to give requirements for wind turbines installed offshore, in articular for the support structure. For offshore installations, reference is made to the IEC 61400-3 series.
2 Normative references
IEC 60034 (all parts)， Rotating electrical machines;
IEC 60038, IEC standard voltages;
IEC 60071-1, Insulation co-ordination-Part 1 Definitions, principles and rules;
IEC 60071-2, Insulation co-ordination- Part 2. Application guidelines;
lEC 60076 (all parts)，Power transformers;
IEC 60204-1, Safety of machinery-Electrical equipment of machines- Part 1: General reauirements;
6.3 Wind conditions
6.3.1 General
A wind turbine shall be designed to safely withstand the wind conditions defined by the selected wind turbine class.
The design values of the wind conditions shall be clearly specified in the design documentation.
The wind regime for load and safety considerations is divided into the normal wind conditions, which will occur frequently during normal operation of a wind turbine, and the extreme wind conditions that are defined as having a 1-year or 50-year return period.
The wind conditions include a constant mean flow combined, in many cases, with either a varying deterministic gust profile or with turbulence. In all cases, the influence of an iclination of the mean flow with respect to a horizontal plane of 8 shall be considered. This flow inclination angle shall be assumed to be invariant with height.

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