EN IEC 61400-5:2020

SLOVENSKI STANDARD
01-oktober-2020
Sistemi za proizvodnjo energije na veter - 5. del: Rotorski listi vetrnih turbin (IEC
61400-5:2020)
Wind energy generation systems - Part 5: Wind turbine blades (IEC 61400-5:2020)
Windenergieanlagen - Teil 5: Rotorblätter von Windenergieanlagen (IEC 61400-5:2020)
Systèmes de génération d'énergie éolienne - Partie 5: Pales d’éoliennes (IEC 61400-
5:2020)
Ta slovenski standard je istoveten z: EN IEC 61400-5:2020
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61400-5

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 27.180
English Version
Wind energy generation systems - Part 5: Wind turbine blades
(IEC 61400-5:2020)
Systèmes de génération d'énergie éolienne - Partie 5: Windenergieanlagen - Teil 5: Rotorblätter von
Pales d'éoliennes Windenergieanlagen
(IEC 61400-5:2020) (IEC 61400-5:2020)
This European Standard was approved by CENELEC on 2020-07-21. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61400-5:2020 E

European foreword
The text of document 88/759/FDIS, future edition 1 of IEC 61400-5, prepared by IEC/TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61400-5:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-04-21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-07-21
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 61400-5:2020 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-415 - International Electrotechnical Vocabulary - - -
Part 415: Wind turbine generator systems
IEC 61400-1 - Wind energy generation systems - Part 1: EN IEC 61400-1 -
Design requirements
IEC 61400-2 - Wind turbines - Part 2: Small wind turbines EN 61400-2 -
IEC 61400-3-1 - Wind energy generation systems - Part 3- EN IEC 61400-3-1 -
1: Design requirements for fixed offshore
wind turbines
IEC 61400-3-2 - Wind energy generation systems - Part 3- - -
2: Design requirements for floating offshore
wind turbines
IEC 61400-23 - Wind turbines - Part 23: Full-scale EN 61400-23 -
structural testing of rotor blades
IEC 61400-24 - Wind energy generation systems - Part 24: EN IEC 61400-24 -
Lightning protection
ISO/IEC 17021-1 - Conformity assessment - Requirements for EN ISO/IEC 17021-1 -
bodies providing audit and certification of
management systems - Part 1:
Requirements
ISO 10474 - Steel and steel products - Inspection - -
documents
ISO 2394 - General principles on reliability for - -
structures
ISO 9000 - Quality management systems - EN ISO 9000 -
Fundamentals and vocabulary
ISO 9001 - Quality management systems - EN ISO 9001 -
Requirements
- - Metallic products - Types of inspection EN 10204 -
documents
ISO 16269-6 - Statistical interpretation of data - Part 6: - -
Determination of statistical tolerance
intervals
IEC 61400-5 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –

Part 5: Wind turbine blades
Systèmes de génération d’énergie éolienne –

Partie 5: Pales d’éoliennes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-8335-6

– 2 – IEC 61400-5:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Notation . 10
4.1 Symbols . 10
4.2 Greek symbols . 11
4.3 Subscripts . 11
4.4 Coordinate systems . 11
5 Design environmental conditions . 12
6 Design . 13
6.1 Structural design process. 13
6.1.1 General requirements . 13
6.1.2 Building block approach for composite structural design . 13
6.1.3 General blade design process . 14
6.1.4 Design loads . 17
6.2 Blade characteristics . 18
6.2.1 Blade properties . 18
6.2.2 Functional design tolerances . 18
6.3 Aerodynamic design . 19
6.3.1 General . 19
6.3.2 Aerodynamic characteristics . 19
6.3.3 Power performance characterisation (informative) . 20
6.3.4 Airfoil noise (informative) . 20
6.4 Material requirements . 20
6.4.1 General . 20
6.4.2 Material properties for blade design . 20
6.4.3 Qualification of materials for manufacture . 24
6.5 Design for manufacturing . 25
6.5.1 General . 25
6.5.2 Requirement for manufacturing tolerances . 25
6.6 Structural design . 26
6.6.1 General design approach . 26
6.6.2 Structural analysis . 27
6.6.3 Verification requirements . 29
6.6.4 Partial safety factors for materials . 30
6.6.5 Structural design verification. 34
6.6.6 Additional failure modes . 47
7 Manufacturing requirements . 48
7.1 Manufacturing process . 48
7.2 Workshop requirements . 48
7.2.1 General . 48
7.2.2 Workshop facilities . 49
7.2.3 Material handling and storage facilities . 49
7.2.4 Tools and equipment . 50

IEC 61400-5:2020 © IEC 2020 – 3 –
7.2.5 Personnel . 51
7.3 Quality management system requirements . 52
7.4 Manufacturing process requirements. 52
7.4.1 General manufacturing requirements . 52
7.4.2 Gelcoat application to the mould . 52
7.4.3 Building up the laminate . 53
7.4.4 Adhesive bonding process . 54
7.4.5 Curing . 55
7.4.6 Demoulding . 55
7.4.7 Trimming, cutting, and grinding . 55
7.4.8 Surface finish . 56
7.4.9 Sealing . 56
7.4.10 Additional component assembly processes . 56
7.4.11 Mass and balance . 57
7.4.12 Manufacturing and assembly processes outside controlled environment . 57
7.5 Manufacture of natural fiber-reinforced rotor blades . 57
7.6 Other manufacturing processes . 58
7.7 Quality control process . 58
7.7.1 Manufacturing quality plan .
...