IEC 61400-1-2019 cor1-2019 PDF

Full title and description

IEC 61400-1:2019 COR1:2019 — Wind energy generation systems - Part 1: Design requirements. This publication specifies essential design requirements to ensure the structural integrity and safe operation of wind turbines and their subsystems (mechanical, electrical, control/protection and support structures) over the planned lifetime. The 2019 edition includes technical updates from the previous edition and the Corrigendum 1 (2019) corrects or clarifies limited editorial and technical items.

Abstract

IEC 61400-1:2019 defines design requirements, design load cases (DLCs), wind turbine classes (including extensions for tropical cyclones and high turbulence), turbulence modelling updates (Weibull distribution for NTM), and revisions to partial safety factors. Corrigendum 1 (2019) provides corrections to the 2019 edition and has been incorporated into consolidated copies of the standard.

General information

• Status: Published.
• Publication date: 8 February 2019 (base edition); Corrigendum 1 circulated September 2019.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 27.180 (Wind turbine energy systems).
• Edition / version: Edition 4.0 (2019); Corrigendum 1 (2019) — consolidated/redline and interpretation sheets exist in subsequent releases.
• Number of pages: 168 (main publication) — Corrigendum 1: typically 1 page; consolidated/redline publications indicate corrigendum content included.

Scope

This part of IEC 61400 specifies essential design requirements to provide an appropriate level of protection against damage from hazards during the planned lifetime of a wind turbine. It applies to wind turbines of all sizes (with IEC 61400-2 intended for small wind turbines) and covers subsystems including control and protection functions, internal electrical systems, mechanical systems and support structures. The document is intended to be used together with relevant IEC and ISO standards.

Key topics and requirements

• Design load cases (DLCs) and procedures for defining representative loads for ultimate and fatigue design.
• Wind turbine classification, including extensions to address tropical cyclones and high-turbulence sites.
• Turbulence modelling updates (Weibull distribution for NTM) and related requirements for site-specific turbulence characterisation.
• Specification and revision of partial safety factors and load combinations for structural design.
• Requirements for electrical, mechanical, control and protection subsystems relevant to structural integrity and safe operation.
• Editorial and technical corrections provided by Corrigendum 1 (2019).

Typical use and users

Used by wind turbine designers, structural and aerodynamic engineers, certification bodies, test laboratories, manufacturers, project developers, and regulators to establish and verify design compliance, perform load calculations, and support certification and type-approval processes. Consolidated and redline editions (including corrigenda and interpretation sheets) are commonly used for procurement and conformity assessment.

Related standards

Commonly used together with other parts of the IEC 61400 series such as IEC 61400-2 (small wind turbines), IEC 61400-3-1 (offshore installations), and other IEC/ISO standards referenced in Clause 2 of the document. National and regional adoptions (EN/IEC) and subsequent amendments or interpretation sheets may also be relevant.

Keywords

wind turbine, design requirements, design load cases (DLC), turbulence model (NTM), Weibull distribution, wind turbine classes, tropical cyclone, partial safety factors, corrigendum.

FAQ

Q: What is this standard?

A: IEC 61400-1:2019 COR1:2019 is the fourth edition (2019) of the international standard for wind turbine design requirements; Corrigendum 1 (2019) provides corrections to that edition.

Q: What does it cover?

A: It covers essential structural and design requirements for wind turbines and their subsystems, including load cases, turbulence modelling, turbine classification (including for extreme environments) and partial safety factors; it is intended to be used with other IEC/ISO standards referenced within the document.

Q: Who typically uses it?

A: Designers, manufacturers, certification bodies, test laboratories, project developers and regulators involved in wind turbine design, testing and conformity assessment.

Q: Is it current or superseded?

A: The 2019 edition (Edition 4.0) with Corrigendum 1 (2019) is the published edition; consolidated/redline copies and subsequent interpretation sheets or amendments (for example interpretation sheet issued in 2025 and regional amendment activity) may be available—users should consult the IEC publication record or national standards bodies for the latest consolidated or amended texts before procurement or certification.

Q: Is it part of a series?

A: Yes — it is Part 1 of the IEC 61400 series (wind energy generation systems), which contains multiple parts addressing small turbines, offshore applications, power quality, measurement, and other topics.

Q: What are the key keywords?

A: Wind turbine, design requirements, load cases, turbulence, turbine classification, partial safety factors, corrigendum.