EN IEC 61400-40:2026

Wind energy generation systems - Part 40: Electromagnetic compatibility (EMC) - Requirements and test methods

IEC 61400-40:2026 provides the EMC requirements and test methods that apply to the individual wind turbine and all the sub systems which are part of the wind turbine. The current document applies to measurements on individual wind turbines and not multiple wind turbines. This document defines the requirements and test methods for the verification of the wind turbine performance against radiated emissions and the immunity of their components against conducted and radiated phenomena. This document is applicable to onshore and offshore wind turbines.

Windenergieanlagen - Teil 40: Elektromagnetische Verträglichkeit (EMV) - Anforderungen und Prüfverfahren

Systèmes de génération d'énergie éolienne - Partie 40: Compatibilité électromagnétique (CEM) - Exigences et méthodes d'essai

IEC 61400-40:2026 définit les exigences de CEM et les méthodes d'essai qui s'appliquent aux éoliennes individuelles ainsi qu'à tous les sous-systèmes qui font partie de l'éolienne. Le présent document s'applique aux mesurages effectués sur des éoliennes individuelles et non sur plusieurs éoliennes. Le présent document définit les exigences et les méthodes d'essai pour la vérification des performances des éoliennes en ce qui concerne les émissions rayonnées et de l'immunité de leurs composants aux phénomènes conduits et rayonnés. Le présent document s'applique aux éoliennes en mer et sur terre. Les considérations relatives à la sécurité ne sont pas couvertes par la présente norme.

Sistemi za proizvodnjo vetrne energije - 40. del: Elektromagnetna združljivost (EMC) - Zahteve in preskusne metode (IEC 61400-40:2026)

IEC 61400-40:2026 določa zahteve za elektromagnetno združljivost (EMC) in preskusne metode, ki se uporabljajo za posamezno vetrno turbino in vse podsisteme, ki so del vetrne turbine.
Ta dokument se uporablja za meritve na posameznih vetrnih turbinah in ne na več vetrnih turbinah.
Ta dokument določa zahteve in preskusne metode za preverjanje zmogljivosti vetrne turbine glede na oddajane emisije in odpornost njihovih komponent proti prevodnim in sevalnim pojavom. Ta dokument je uporaben za vetrne turbine na kopnem in na morju.

General Information

• Status: Published
• Publication Date: 09-Apr-2026
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: CLC/TC 88 - Wind turbines
• Drafting Committee: IEC/TC 88 - IEC_TC_88
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 10-Apr-2026
• Completion Date: 10-Apr-2026
• Ref Project: SIST EN IEC 61400-40:2026 - Wind energry generation systems - Part 40: Electromagnetic compatibility (EMC) - Requirements and test methods (IEC 61400-40:2026)

Relations

• Replaces: EN 61400-4:2013 - Wind turbines - Part 4: Design requirements for wind turbine gearboxes
• Effective Date: 24-Aug-2021
• Refers: EN 55016-2-3:2017 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance measurements
• Effective Date: 24-Mar-2026
• Refers: EN IEC 55016-1-1:2019 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus
• Effective Date: 24-Mar-2026
• Refers: EN 55016-1-6:2015 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-6: Radio disturbance and immunity measuring apparatus - EMC antenna calibration
• Effective Date: 24-Mar-2026
• Refers: EN 61000-4-5:2014 - Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test
• Effective Date: 24-Mar-2026
• Refers: EN 61000-4-34:2007 - Electromagnetic compatibility (EMC) - Part 4-34: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests for equipment with mains current more than 16 A per phase
• Effective Date: 24-Mar-2026
• Refers: EN 61400-2:2014 - Wind turbines - Part 2: Small wind turbines
• Effective Date: 24-Mar-2026
• Refers: EN IEC 61000-4-11:2020 - Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests for equipment with input current up to 16 A per phase
• Effective Date: 24-Mar-2026
• Refers: EN 55016-2-3:2017/A1:2019 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance measurements
• Effective Date: 24-Mar-2026
• Refers: EN IEC 61000-4-3:2020 - Electromagnetic compatibility (EMC) - Part 4-3 : Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test
• Effective Date: 24-Mar-2026
• Refers: EN IEC 55011:2025 - Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
• Effective Date: 24-Mar-2026
• Refers: EN IEC 55016-1-4:2025 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test sites for radiated disturbance measurements
• Effective Date: 24-Mar-2026
• Refers: EN 61000-4-8:2010 - Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement techniques - Power frequency magnetic field immunity test
• Effective Date: 24-Mar-2026
• Refers: EN IEC 61000-6-2:2019 - Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity standard for industrial environments
• Effective Date: 24-Mar-2026
• Refers: EN 61000-4-4:2012 - Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test
• Effective Date: 24-Mar-2026

Overview

EN IEC 61400-40:2026 sets out essential requirements and test methods for electromagnetic compatibility (EMC) in wind energy generation systems, specifically applying to individual wind turbines and their subsystems. Published by CLC, this international standard ensures that both onshore and offshore wind turbines are evaluated for radiated emissions and the immunity of their components to conducted and radiated electromagnetic phenomena. By complying with these EMC requirements, wind turbine manufacturers and operators can minimize interference with other equipment, ensuring reliable grid integration and maintaining the safety and reliability standards expected in modern wind energy installations.

Key Topics

• Scope: The standard applies to individual wind turbines, including all subsystems, for both onshore and offshore installations. It does not cover arrays or multiple turbines as a whole.
• EMC Requirements: Detailed emission and immunity requirements help verify that wind turbines do not cause or are not susceptible to electromagnetic interference.
• Test Methods: Defines specific measurement procedures, setups, and operating conditions for assessing electromagnetic emissions and immunity.
• Measurement Focus:
  • Radiated and conducted magnetic emissions (150 kHz–30 MHz)
  • Radiated electric field emissions (30 MHz–1 GHz)
  • Immunity tests including electrostatic discharge, radiated electromagnetic fields, fast transient bursts, surges, power frequency magnetic fields, and voltage dips/interruptions
• Documentation: Specifies the necessary data recording and reporting practices for test results, site conditions, and system configurations.
• Compliance with Related IEC and CISPR Standards: Incorporates and references a range of EMC terminology, measurement, and evaluation criteria from internationally recognized publications.

Applications

EN IEC 61400-40:2026 is vital for the following stakeholders in the wind energy sector:

• Wind Turbine Manufacturers: Ensures that turbine designs meet current EMC performance criteria, preventing interference with communications equipment and neighboring infrastructure.
• Wind Farm Developers and Operators: Helps reduce downtime and operational risks due to electromagnetic disturbances; supports smooth grid integration of new turbines.
• Test Laboratories and Certification Bodies: Provides clear, harmonized procedures and requirements for EMC compliance assessment and reporting.
• Regulatory Authorities: Offers a basis for national and regional conformity assessment in wind power projects, supporting alignment with European and international regulations.
• Design Engineers: Supports the planning and implementation of EMC-compliant subsystems, including control systems, converters, and transformers used within turbine installations.

By adopting this standard, industry stakeholders can assure regulatory compliance, facilitate international market access, and promote high standards of wind turbine reliability and performance.

Related Standards

EN IEC 61400-40:2026 is closely linked with several other international standards, providing a comprehensive framework for EMC and wind energy systems:

• IEC 61400-1: Wind energy generation systems - Design requirements
• IEC 61000 Series: Electromagnetic compatibility (EMC) standards covering general immunity and emission requirements, testing, and measurement techniques
  • IEC 61000-4-2: Electrostatic discharge immunity
  • IEC 61000-4-3: Radiated, radio-frequency, electromagnetic field immunity
  • IEC 61000-4-4: Electrical fast transient/burst immunity
  • IEC 61000-4-5: Surge immunity
  • IEC 61000-4-6: Conducted immunity to RF fields
  • IEC 61000-4-8: Power frequency magnetic field immunity
  • IEC 61000-4-11, -34: Voltage dips and interruption immunity
• CISPR Standards: Address radio-frequency disturbance limits and measurement equipment, such as CISPR 11, CISPR 16-1-1, and CISPR 16-2-3

By following EN IEC 61400-40:2026 together with these referenced standards, organizations ensure comprehensive EMC compliance for wind energy projects, supporting innovation and sustainability in global renewable energy markets.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2026
Nadomešča:
SIST EN 61400-4:2013
Sistemi za proizvodnjo vetrne energije - 40. del: Elektromagnetna združljivost
(EMC) - Zahteve in preskusne metode (IEC 61400-40:2026)
Wind energry generation systems - Part 40: Electromagnetic compatibility (EMC) -
Requirements and test methods (IEC 61400-40:2026)
Windenergieanlagen – Teil 40: Elektromagnetische Verträglichkeit (EMV) –
Anforderungen und Prüfverfahren (IEC 61400-40:2026)
Systèmes de génération d'énergie éolienne - Partie 40: Compatibilité électromagnétique
(CEM) - Exigences et méthodes d'essai (IEC 61400-40:2026)
Ta slovenski standard je istoveten z: EN IEC 61400-40:2026
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61400-40

NORME EUROPÉENNE
EUROPÄISCHE NORM April 2026
ICS 27.180 Supersedes EN 61400-4:2013
English Version
Wind energy generation systems - Part 40: Electromagnetic
compatibility (EMC) - Requirements and test methods
(IEC 61400-40:2026)
Systèmes de génération d'énergie éolienne - Partie 40: Windenergieanlagen - Teil 40: Elektromagnetische
Compatibilité électromagnétique (CEM) - Exigences et Verträglichkeit (EMV) - Anforderungen und Prüfverfahren
méthodes d'essai (IEC 61400-40:2026)
(IEC 61400-40:2026)
This European Standard was approved by CENELEC on 2026-04-01. 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,
Türkiye 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
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61400-40:2026 E

European foreword
The text of document 88/1131/FDIS, future edition 1 of IEC 61400-40, prepared by TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61400-40:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-04-30
document have to be withdrawn
This document supersedes EN 61400-4:2013 and all of its amendments and corrigenda (if any).
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61400-40:2026 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61400-21-1 NOTE Approved as EN IEC 61400-21-1
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC/TR 61000-2-5 - Electromagnetic compatibility (EMC) - Part - -
2-5: Environment - Description and
classification of electromagnetic
environments
IEC 61000-4-2 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-2 -
4-2: Testing and measurement techniques
- Electrostatic discharge immunity test
IEC 61000-4-3 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-3 -
4-3: Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-4 - Electromagnetic compatibility (EMC) - Part EN 61000-4-4 -
4-4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-5 - Electromagnetic compatibility (EMC) - Part EN 61000-4-5 -
4-5: Testing and measurement techniques
- Surge immunity test
IEC 61000-4-6 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-6 -
4-6: Testing and measurement techniques
- Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61000-4-8 - Electromagnetic compatibility (EMC) - Part EN 61000-4-8 -
4-8: Testing and measurement techniques
- Power frequency magnetic field immunity
test
IEC 61000-4-11 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-11 -
4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current up to 16 A per phase
IEC 61000-4-34 - Electromagnetic compatibility (EMC) - Part EN 61000-4-34 -
4-34: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current more than 16 A per phase
IEC 61000-6-2 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-2 -
6-2: Generic standards - Immunity
standard for industrial environments
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 -
CISPR 11 2024 Industrial, scientific and medical equipment EN IEC 55011 2025
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
CISPR 16-1-1 2019 Specification for radio disturbance and EN IEC 55016-1-1 2019
immunity measuring apparatus and
methods - Part 1-1: Radio disturbance and
immunity measuring apparatus -
Measuring apparatus
CISPR 16-1-4 - Specification for radio disturbance and EN IEC 55016-1-4 -
immunity measuring apparatus and
methods - Part 1-4: Radio disturbance and
immunity measuring apparatus - Antennas
and test sites for radiated disturbance
measurements
CISPR 16-1-6 - Specification for radio disturbance and EN 55016-1-6 -
immunity measuring apparatus and
methods - Part 1-6: Radio disturbance and
immunity measuring apparatus - EMC
antenna calibration
CISPR 16-2-3 2016 Specification for radio disturbance and EN 55016-2-3 2017
immunity measuring apparatus and
methods - Part 2-3: Methods of
measurement of disturbances and
immunity - Radiated disturbance
measurements
+ A1 2019 + A1 2019
+ A2 2023 + A2 2023
CISPR 16-4-2 - Specification for radio disturbance and EN 55016-4-2 -
immunity measuring apparatus and
methods - Part 4-2: Uncertainties, statistics
and limit modelling - Measurement
instrumentation uncertainty
IEC 61400-40 ®
Edition 1.0 2026-02
INTERNATIONAL
STANDARD
Wind energy generation systems -
Part 40: Electromagnetic compatibility (EMC) - Requirements and test methods
ICS 27.180  ISBN 978-2-8327-1004-3

IEC 61400-40:2026-02(en)
IEC 61400-40:2026 © IEC 2026
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, abbreviated terms and units . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms and units . 6
4 Operating conditions during testing. 6
5 Emission requirements . 7
5.1 General . 7
5.2 Conducted emissions . 7
5.3 Radiated emissions. 7
5.3.1 General. 7
5.3.2 Measurement system . 9
5.3.3 Data recording . 9
5.3.4 Requirements for the wind turbine . 10
5.3.5 Requirements for the measurement site . 10
5.3.6 Weather conditions . 10
5.3.7 Measurement setup . 10
5.3.8 Description of the operating modes . 14
5.3.9 Limit values . 15
5.3.10 Measurement uncertainty . 15
5.4 Flicker . 16
6 Immunity requirements . 16
6.1 General . 16
6.2 Electrostatic discharge . 16
6.3 Immunity to radiated electromagnetic fields . 16
6.4 Immunity to burst EFT . 16
6.5 Surge tests . 16
6.6 Conducted immunity . 16
6.7 Immunity to power frequency magnetic field . 16
6.8 Voltage dips, short interruptions and voltage variations . 17
7 Test reports . 17
7.1 Test report requirements for emission tests of the wind turbine . 17
7.1.1 General. 17
7.1.2 Wind turbine . 17
7.1.3 Antenna orientation for each measurement point . 17
7.1.4 Site description . 18
7.1.5 Description of the test setup . 18
7.1.6 Test report annex . 18
7.2 Test report requirements for immunity tests . 18
Annex A (informative) Variations with effect on EMC behaviour of a wind turbine . 19
Annex B (normative) Main converter of wind turbines . 20
Annex C (normative) Limit values CISPR 11:2024, Table 20 . 21
Annex D (informative) Deviation from CISPR standards . 22
IEC 61400-40:2026 © IEC 2026
Annex E (informative) Recommendation of a possible procedure to detect buried
cables . 23
Bibliography . 24

Figure 1 – Recommended flow chart of EMI measurement . 8
Figure 2 – Example of a test configuration for an EMC measurement on a wind turbine
– Reference points relative to the wind turbine hub . 12
Figure 3 – Example of a test configuration with a transformer . 13
Figure 4 – Example of a test setup of a magnetic field strength measurement . 13
Figure 5 – Example of a test setup of an electric field strength measurement. 14
Figure 6 – Overview of operating modes of a wind turbine . 15

Table 1 – Summary of measurements for each reference point of the antenna . 9
Table C.1 – CISPR 11:2024 limits for 30 m measurement distance . 21

IEC 61400-40:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Wind energy generation systems -
Part 40: Electromagnetic compatibility (EMC) -
Requirements and test methods
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61400-40 has been prepared by IEC technical committee 88: Wind energy generation
systems. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
88/1131/FDIS 88/1144/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
IEC 61400-40:2026 © IEC 2026
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 61400 series, under the general title: Wind energy generation
systems, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 61400-40:2026 © IEC 2026
1 Scope
This part of IEC 61400 provides the EMC requirements and test methods that apply to the
individual wind turbine and all the sub systems which are part of the wind turbine.
The current document applies to measurements on individual wind turbines and not multiple
wind turbines.
This document defines the requirements and test methods for the verification of the wind turbine
performance against radiated emissions and the immunity of their components against
conducted and radiated phenomena.
This document is applicable to onshore and offshore wind turbines.
Safety considerations are not covered by this standard.
2 Normative references
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.
IEC TR 61000-2-5, Electromagnetic compatibility (EMC) - Part 2-5: Environment - Description
and classification of electromagnetic environments
IEC 61000-4-2, Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement
techniques - Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement
techniques - Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-8, Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement
techniques - Power frequency magnetic field immunity test
IEC 61000-4-11, Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement
techniques - Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current up to 16 A per phase
IEC 61000-4-34, Electromagnetic compatibility (EMC) - Part 4-34: Testing and measurement
techniques - Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current more than 16 A per phase
IEC 61000-6-2, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity
standard for industrial environments
IEC 61400-40:2026 © IEC 2026
IEC 61400-1, Wind energy generation systems - Part 1: Design requirements
IEC 61400-2, Wind turbines - Part 2: Small wind turbines
CISPR 11:2024, Industrial, scientific and medical equipment - Radio-frequency disturbance
characteristics - Limits and methods of measurement
CISPR 16-1-1:2019, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring
apparatus
CISPR 16-1-4, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test
sites for radiated disturbance measurements
CISPR 16-1-6, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-6: Radio disturbance and immunity measuring apparatus - EMC antenna
calibration
CISPR 16-2-3:2016, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated
disturbance measurements
CISPR 16-2-3:2016/AMD1:2019
CISPR 16-2-3:2016/AMD2:2023
CISPR 16-4-2, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 4-2: Uncertainties, statistics and limit modelling - Measurement instrumentation
uncertainty
3 Terms, definitions, abbreviated terms and units
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61400-1, IEC 61400-2
and CISPR 11 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Abbreviated terms and units
NOTE 1 Generic abbreviations are used in this document.
NOTE 2 Only generic symbols and units are used in this document.
EMI electromagnetic interference
EUT equipment under test
ESD electrostatic discharge
EFT electrical fast transient
4 Operating conditions during testing
Operating conditions specific for this document are included in the relevant clauses.
IEC 61400-40:2026 © IEC 2026
5 Emission requirements
5.1 General
The wind turbine shall fulfil the emission requirements of this document.
Additional requirements for main converters of wind turbines are shown in Annex B.
Changes on a wind turbine can have an effect on the EMC behaviour of the wind turbine. An
overview of the main characteristics that can have influence on EMC behaviour of a wind turbine
is described in Annex A.
5.2 Conducted emissions
For radio protection purposes, the radiated magnetic emissions of the whole wind turbine are
measured in the range of 150 kHz to 30 MHz (conducted emissions frequency range). Instead
of measuring the common mode/differential mode currents, the radiated magnetic emissions
generated by these currents are measured as described in 5.3.
Harmonic, interharmonic and higher frequency emission requirements which are relevant to
and are out
power quality for grid connected wind turbines are handled in IEC 61400-21-1 [1]
of scope of this document.
5.3 Radiated emissions
5.3.1 General
Due to continuous variation of wind speed and other external influences, the emissions of wind
turbines can vary during the measurements. The emissions from the wind turbine shall be
distinguished from ambient signals.
An overview of a recommended test sequence is given in Figure 1 and Table 1.
Description of Figure 1:
The measurements shall be executed under the following conditions:
• Reference points and orientations of the antenna are given in 5.3.7.
• The settings of the EMI-receiver are given in 5.3.7.
• The operating modes of the wind turbine are given in 5.3.8.
• To
...