IEC 61400-3-1:2019

Wind energy generation systems - Part 3-1: Design requirements for fixed offshore wind turbines

IEC 61400-3-1:2019

Name:IEC 61400-3-1:2019   Standard name:Wind energy generation systems - Part 3-1: Design requirements for fixed offshore wind turbines
Standard number:IEC 61400-3-1:2019   language:English language
Release Date:04-Apr-2019   technical committee:TC 88 - Wind energy generation systems
Drafting committee:WG 3 - TC 88/WG 3   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 61400-3-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
colour
inside
Wind energy generation systems –
Part 3-1: Design requirements for fixed offshore wind turbines





your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de
CH-1211 Geneva 20
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

.
IEC 61400-3-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
colour
inside
Wind energy generation systems –

Part 3-1: Design requirements for fixed offshore wind turbines

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.180 ISBN 978-2-8322-6600-7

– 2 – IEC 61400-3-1:2019 © IEC 2019
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
4 Symbols and abbreviated terms . 19
4.1 Symbols and units. 19
4.2 Abbreviations . 20
5 Principal elements . 21
5.1 General . 21
5.2 Design methods . 21
5.3 Safety classes . 22
5.4 Quality assurance . 22
5.5 Rotor–nacelle assembly markings . 23
6 External conditions – definition and assessment . 23
6.1 General . 23
6.2 Wind turbine classes . 24
6.3 Definition of external conditions at an offshore wind turbine site . 24
6.3.1 General . 24
6.3.2 Wind conditions . 25
6.3.3 Marine conditions . 25
6.3.4 Electrical power network conditions . 32
6.3.5 Other environmental conditions . 32
6.4 Assessment of external conditions at an offshore wind turbine site . 33
6.4.1 General . 33
6.4.2 The metocean database . 33
6.4.3 Assessment of wind conditions . 34
6.4.4 Assessment of marine conditions . 36
6.4.5 Assessment of other environmental conditions . 40
6.4.6 Assessment of electrical network conditions . 41
6.4.7 Assessment of soil conditions . 41
7 Structural design . 42
7.1 General . 42
7.2 Design methodology . 42
7.3 Loads. 42
7.3.1 General . 42
7.3.2 Gravitational and inertial loads . 42
7.3.3 Aerodynamic loads . 43
7.3.4 Actuation loads . 43
7.3.5 Hydrodynamic loads . 43
7.3.6 Sea/lake ice loads . 43
7.3.7 Other loads . 44
7.4 Design situations and load cases . 44
7.4.1 General . 44
7.4.2 Power production (DLC 1.1 to 1.6) . 50

7.4.3 Power production plus occurrence of fault or loss of electrical network
connection (DLC 2.1 – 2.5) . 51
7.4.4 Start up (DLC 3.1 to 3.3). 53
7.4.5 Normal shutdown (DLC 4.1 to 4.2) . 54
7.4.6 Emergency stop (DLC 5.1) . 54
7.4.7 Parked (standstill or idling) (DLC 6.1 to 6.4) . 55
7.4.8 Parked plus fault conditions (DLC 7.1 to 7.2) . 56
7.4.9 Transport, assembly, maintenance and repair (DLC 8.1 to 8.4) . 57
7.4.10 Sea/lake ice design load cases . 60
7.5 Load and load effect calculations . 61
7.5.1 General . 61
7.5.2 Relevance of hydrodynamic loads . 61
7.5.3 Calculation of hydrodynamic loads . 62
7.5.4 Calculation of sea/lake ice loads . 62
7.5.5 Overall damping assessment for support structure response evaluations . 62
7.5.6 Simulation requirements . 64
7.5.7 Other requirements . 65
7.6 Ultimate limit state analysis. 66
7.6.1 Method . 66
7.6.2 Ultimate strength analysis . 68
7.6.3 Fatigue failure . 68
7.6.4 Special partial safety factors . 69
7.6.5 Assessment of cyclic loading for foundation assessment . 69
8 Control system . 69
9 Mechanical systems . 70
10 Electrical system . 70
11 Foundation and substructure design . 70
12 Assembly, installation and erection . 71
12.1 General . 71
12.2 Planning . 72
12.3 Installation conditions . 72
12.4 Site access . 72
12.5 Environmental conditions . 73
12.6 Documentation . 73
12.7 Receiving, handling and storage . 73
12.8 Support structure systems . 73
12.9 Assembly of offshore wind turbine . 73
12.10 Erection of offshore wind turbine . 74
12.11 Fasteners and attachments . 74
12.12 Cranes, hoists and lifting equipment . 74
13 Commissioning, operation and maintenance . 74
13.1 General . 74
13.2 Design requirements for safe operation, inspection and maintenance . 75
13.3 Instructions concerning commissioning . 76
13.3.1 General . 76
13.3.2 Energization . 76
13.3.3 Commissioning tests . 76
13.3.4 Records . 76

– 4 – IEC 61400-3-1:2019 © IEC 2019
13.3.5 Post commissioning activities . 76
13.4 Operator’s instruction manual . 76
13.4.1 General . 76
13.4.2 Instr
...

  • Relates Information
  • ISO 8130-9:1992

    ISO 8130-9:1992 - Coating powders
    09-28
  • EN 352-2:2020/FprA1

    EN 352-2:2021/oprA1:2023
    09-28
  • IEC TS 61158-4:1999

    IEC TS 61158-4:1999 - Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Part 4: Data Link protocol specification Released:3/24/1999 Isbn:2831847656
    09-28
  • HD 566 S1:1990

    HD 566 S1:1998
    09-28
  • ISO 5131:1982/Amd 1:1992

    ISO 5131:1982/Amd 1:1992
    09-28
  • EN 60598-2-22:1990

    EN 60598-2-22:1996
    09-27
  • ISO 8504-2:1992

    ISO 8504-2:1992 - Preparation of steel substrates before application of paints and related products -- Surface preparation methods
    09-27
  • EN 12165:2024

    prEN 12165:2022
    09-27
  • IEC TS 61158-6:1999

    IEC TS 61158-6:1999 - Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Part 6: Application Layer protocol specification Released:3/24/1999 Isbn:2831847613
    09-27
  • ISO 4252:1992

    ISO 4252:1992 - Agricultural tractors -- Operator's workplace, access and exit -- Dimensions
    09-27