Wind energy generation systems - Part 50: Wind measurement - Overview

IEC 61400-50:2022 provides a general introduction to the options that are available for wind measurement, which are further detailed in the other parts of the IEC 61400-50 series. Tandis que ces autres normes définissent les cas d’utilisation relatifs aux mesurages du vent, la série IEC 61400-50 établit des exigences de mesure du vent qui sont indépendantes des cas d’utilisation. Son objectif est d’assurer que les mesurages du vent et l’évaluation des incertitudes (relative à ces mesurages) sont effectués de manière cohérente dans tout le secteur éolien; et d’assurer que ces mesurages du vent sont effectués de telle sorte que les incertitudes pouvant être quantifiées soient dans une plage acceptable.
This first edition of IEC 61400-50 is part of a structural revision that cancels and replaces the performance standards IEC 61400-12-1:2017 and IEC 61400-12-2:2013. The structural revision contains no technical changes with respect to IEC 61400-12-1:2017 and IEC 61400-12-2:2013, but the parts that relate to wind measurements, measurement of site calibration and assessment of obstacle and terrain have been extracted into separate standards.

Systèmes de génération d’énergie éolienne – Partie 50: Mesurage du vent - Vue d'ensemble

IEC 61400-50:2022 fournit une introduction générale aux options de mesure du vent disponibles, avec de plus amples informations dans les autres parties de la série IEC 61400‑50. Whereas those other standards define use-cases for wind measurements, the IEC 61400-50 series sets those wind measurement requirements which are independent of the use-case. Its purpose is to ensure that wind measurements and the evaluation of uncertainties in those measurements are carried out consistently across the wind industry and that wind measurements are carried out such that the uncertainties can be quantified and that those uncertainties are within an acceptable range.
La présente première édition de l’IEC 61400-50 fait partie d’une révision structurelle qui annule et remplace les normes de performance IEC 61400-12-1:2017 et IEC 61400-12-2:2013. Cette révision structurelle ne contient aucune modification technique par rapport à l'IEC 61400-12-1:2017 et l'IEC 61400-12 2:2013. Toutefois, les parties relatives aux mesurages du vent, au mesurage de l'étalonnage du site et à l'évaluation des obstacles et du terrain ont été extraites vers des normes distinctes.

General Information

Status
Published
Publication Date
29-Aug-2022
Current Stage
PPUB - Publication issued
Completion Date
30-Aug-2022
Ref Project

Buy Standard

Standard
IEC 61400-50:2022 - Wind energy generation systems - Part 50: Wind measurement - Overview
English and French language
25 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 61400-50
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –
Part 50: Wind measurement – Overview
Systèmes de génération d'énergie éolienne –
Partie 50: Mesurage du vent – Vue d’ensemble
IEC 61400-50:2022-08(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2022 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
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 IEC Products & Services Portal - products.iec.ch

The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the

variety of criteria (reference number, text, technical publications previews. With a subscription you will always

committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.

and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - IEC Products & Services Portal - products.iec.ch

webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez

La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un

en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour

comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 300 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
19 langues additionnelles. Egalement appelé Vocabulaire
Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
---------------------- Page: 2 ----------------------
IEC 61400-50
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –
Part 50: Wind measurement – Overview
Systèmes de génération d'énergie éolienne –
Partie 50: Mesurage du vent – Vue d’ensemble
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-5600-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61400-50:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Symbols, units and abbreviated terms ............................................................................. 7

5 Wind measurement overview ........................................................................................... 8

6 Interfaces between standards .......................................................................................... 9

Bibliography .......................................................................................................................... 12

Figure 1 – Overview of relationship between standards in the IEC 61400-12 and

IEC 61400-50 series ............................................................................................................. 10

Table 1 – IEC 61400 series parts which make reference to wind measurements

previously defined in IEC 61400-12-1 ................................................................................... 11

---------------------- Page: 4 ----------------------
IEC 61400-50:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND ENERGY GENERATION SYSTEMS –
Part 50: Wind measurement – Overview
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 61400-50 has been prepared by IEC technical committee 88: Wind energy generation

systems. It is an International Standard.

This first edition of IEC 61400-50 is part of a structural revision that cancels and replaces the

performance standards IEC 61400-12-1:2017 and IEC 61400-12-2:2013. The structural revision

contains no technical changes with respect to IEC 61400-12-1:2017 and IEC 61400-12-2:2013,

but the parts that relate to wind measurements, measurement of site calibration and assessment

of obstacle and terrain have been extracted into separate standards.

The purpose of the re-structure was to allow the future management and revision of the power

performance standards to be carried out more efficiently in terms of time and cost and to provide

a more logical division of the wind measurement requirements into a series of separate

standards which could be referred to by other use-case standards in the IEC 61400 series and

subsequently maintained and developed by appropriate experts.
---------------------- Page: 5 ----------------------
– 4 – IEC 61400-50:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
88/827/CDV 88/863/RVC

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.

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/standardsdev/publications.

A list of all parts in the IEC 61400 series, published 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,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 6 ----------------------
IEC 61400-50:2022 © IEC 2022 – 5 –
INTRODUCTION

The purpose of the IEC 61400-50 series of standards is to provide uniform methodologies and

requirements that will ensure consistency, accuracy and reproducibility in the measurement of

the wind. In creating the IEC 61400-50 series of standards, a distinction is now made between

the method of measurement of the wind and the various "use-cases" in other parts of IEC 61400

in which those wind measurements are applied (e.g. power performance, noise measurement,

load measurement, resource assessment). It is anticipated that the IEC 61400-50 series of

standards will be applied by:

a) wind turbine manufacturers testing prototype or serial production turbines with the aim of

determining or verifying aspects of the turbine specification where the measured wind is a

necessary input (e.g. power performance, noise, structural loads);

b) wind measurement equipment manufacturers providing instruments, meteorological masts

and mounting hardware to the wind industry;

c) organizations and laboratories providing wind measurement instrumentation calibration

services;

d) technical consultants delivering wind measurement services to wind turbine manufacturers,

wind farm developers and operators, etc.;

e) wind turbine operators who need to verify that stated or required specifications are met and

which require wind measurements as an input;

f) other committees developing standards in the IEC 61400 series which make reference to

the specification of equipment and methods to be used in the measurement of the wind.

This series of related standards provides guidance in the wind measurement methods,

equipment, classification, calibration and uncertainty assessment that can be used in the

delivery of various use-case tests. The standards will benefit those parties involved in the

manufacture, installation planning and permitting, operation, utilization, and regulation of wind

turbines. The technically accurate measurement techniques recommended in these standards

should be applied by all parties to ensure that continuing development and operation of wind

turbines is carried out in an atmosphere of consistent and accurate communication relative to

wind measurement. These standards present measurement, classification and calibration

procedures expected to provide accurate results that can be replicated by others. Meanwhile,

a user of these standards needs to be aware that not all wind measurement methods specified

in these standards are applicable to all use-cases. The use-case standards (e.g. power

performance) define which wind measurement methods and equipment are allowable and in

which circumstances. Furthermore, the use-case standards may define further restrictions on

the wind measurements (e.g. height of measurement). Therefore, a user should consider the

most appropriate wind measurement method and standard in relation to the use-case to which

the wind measurements are to be put before procuring the wind measurements.
The separated standards in the wind measurement series comprise:

a) IEC 61400-50, Wind energy generation systems – Part 50: Wind measurement – Overview

b) IEC 61400-50-1, Wind energy generation systems – Part 50-1: Wind measurement –

Application of meteorological mast, nacelle and spinner mounted instruments

c) IEC 61400-50-2, Wind energy generation systems – Part 50-2: Wind measurement –

Application of ground-mounted remote sensing technology

d) IEC 61400-50-3, Wind energy generation systems – Part 50-3: Use of nacelle-mounted

lidars for wind measurements

Procedures for calibration, classification, mounting and derivation of the measurement

uncertainty of cup anemometers and ultrasonic anemometers are given in IEC 61400-50-1.

Procedures for calibration, classification and derivation of the measurement uncertainty of

remote sensing devices are given in IEC 61400-50-2. Special care should be taken in the

selection of the instruments and methods chosen to measure the wind because it can influence

the result of the test.
---------------------- Page: 7 ----------------------
– 6 – IEC 61400-50:2022 © IEC 2022
WIND ENERGY GENERATION SYSTEMS –
Part 50: Wind measurements – Overview
1 Scope

The IEC 61400 series of standards addresses wind energy generation technical requirements

up to the point of interconnection with the utility grid system. The IEC 61400-50 series of

standards comprises a sub-set of standards which specify the requirements for equipment and

methods to be used in the measurement of the wind.

Wind measurements are required as inputs to various tests and analyses specified in other use-

case standards in the IEC 61400 series (e.g. power performance, resource assessment, noise

measurement). Whereas those other standards define use-cases for wind measurements, the

IEC 61400-50 series sets those wind measurement requirements which are independent of the

use-case. Its purpose is to ensure that wind measurements and the evaluation of uncertainties

in those measurements are carried out consistently across the wind industry and that wind

measurements are carried out such that the uncertainties can be quantified and that those

uncertainties are within an acceptable range.

This document provides a general introduction to the options that are available for wind

measurement, which are further detailed in the other parts of the IEC 61400-50 series.

2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
complex terrain

terrain surrounding the test site that features significant variations in topography and terrain

obstacles that can cause flow distortion
3.2
cut-in wind speed
lowest wind speed at which a wind turbine will begin to produce power
3.3
cut-out wind speed
wind speed at which a wind turbine cuts out from the grid due to high wind speed
3.4
data set
collection of data sampled over a continuous period
---------------------- Page: 8 ----------------------
IEC 61400-50:2022 © IEC 2022 – 7 –
3.5
flow distortion

change in air flow caused by obstacles, topographical variations, or other wind turbines that

results in the wind speed at the measurement location being different from the wind speed at

the wind turbine location
3.6
hub height

height of the centre of the swept area of the wind turbine rotor above the

ground at the tower

Note 1 to entry: For a vertical axis wind turbine the hub height is defined as the height of the centroid of the swept

area of the rotor above the ground at the tower.
3.7
power performance
measure of the capability of a wind turbine to produce electric power and energy
3.8
rotor equivalent wind speed

wind speed corresponding to the kinetic energy flux through the swept rotor area when

accounting for the variation of the wind speed with height
3.9
standard uncertainty
uncertainty of the result of a measurement expressed as a standard deviation
3.10
uncertainty in measurement

parameter, associated with the result of a measurement, which characterizes the dispersion of

the values that could reasonably be attributed to the measurand
3.11
wind measurement equipment
meteorological mast or remote sensing device
3.12
wind shear
change of wind speed with height across the wind turbine rotor
3.13
wind veer
change of wind direction with height across the wind turbine rotor
4 Symbols, units and abbreviated terms
Symbol Description Unit
NTF nacelle transfer function
RSD remote sensing device
U wind speed [m/s]
wind speed in bin i [m/s]
u category B standard uncertainty component
combined category B uncertainties in bin i
V wind speed [m/s]
---------------------- Page: 9 ----------------------
– 8 – IEC 61400-50:2022 © IEC 2022
Symbol Description Unit
annual average wind speed at hub height [m/s]
ave
measured wind speed averaged over 10 min [m/s]
10min
WME wind measurement equipment
α wind shear exponent from power law
standard deviation of parameter averaged over 10 min
10min
5 Wind measurement overview

The term "wind measurement" refers to the determination of various characteristics of the wind

by measurement. These characteristics commonly include wind speed, wind direction and

turbulence intensity, although there are other characteristics of the wind which can be

determined by measurement. Furthermore, these characteristics can be defined in terms of

differing spatial extents of measurement (e.g. point or volumetric), time base (e.g. high

frequency or low frequency) and components (e.g. horizontal, line of sight or 3D vectors). The

first editions of the IEC 61400-50 series of standards are focused on requirements for

instruments and methods to measure wind speed, wind direction and turbulence intensity which

will typically be reduced to 10-minute statistics (mean, minimum, maximum, standard deviation)

for use as input to an analysis or process defined in one of the use-case standards in the

IEC 61400 series.

Many of the methods, assumptions and specifications associated with the wind industry are

historically linked to the assumption that wind measurements are carried out with a cup

anemometer measuring the horizontal component of the wind. This typically implies that the

wind measurements are point measurements and are generally low pass filtered (due to the

inherent inertial and aerodynamic characteristics of a cup anemometer).

NOTE The term "point measurement" is used in a relative sense here. A cup anemometer or ultrasonic anemometer

is of relatively small dimensions compared to a large wind turbine or compared to the measurement volume of remote

sensing devices. In that sense, the wind measurement from a cup or ultrasonic anemometer can be considered to be

a point measurement.

However, other measurement technologies have become common place in the past decade.

These technologies include ultrasonic anemometers and remote sensing devices (RSDs) such

as lidars and sodars. The wind measurements provided by these devices are achieved in a

different way to those from a cup anemometer and are possibly not directly comparable with

those from a cup anemometer without further post-processing.

In the case of ultrasonic anemometers, instruments are available which provide full three-

dimensional wind measurement at a point but, as they have no moving parts, are not subject to

the inertial or aerodynamic filtering experienced by a cup anemometer. This can make ultrasonic

anemometers particularly suitable for situations where complex or turbulent wind flows are

being investigated and higher frequency measurements of multiple vector components of the

wind are required. The relatively small size of the probes and lack of moving parts on ultrasonic

anemometers can make the provision of heating to prevent icing less onerous than on a cup

anemometer, making them particularly suitable for wind measurements in cold climates.

RSDs carry out measurements of the wind through a relatively large volume (of the order of

metres to tens of metres in scale) at a range of heights above or distances from the

measurement device’s physical location (of the order of several to many hundreds of metres

above or from the RSD). The more complex the flow through that measurement volume, the

more likely it is that the wind parameters measured by an RSD will be significantly different to

(or even erroneous compared to) those achieved from a cup or ultrasonic anemometer

measuring at nominally the same location and height as the RSD but over a small volume of

the order of centimetres in scale. However, RSDs can have advantages in terms of

deployability, safety (if ground mounted) and allowing economic measurement of the wind at

---------------------- Page: 10 ----------------------
IEC 61400-50:2022 © IEC 2022 – 9 –

high heights above ground when compared to conventional mast mounted cup or ultrasonic

anemometers.

From the above it is evident that different wind measurement methods are influenced not only

by the characteristics of the instrument but also by the environment in which the wind

measurement instrument is sited. The complexity of the wind flow influences the accuracy of

the wind measurements as defined by the instrument’s classification or indeed can result in a

particular type of instrument being inappropriate for use in certain wind flow or complex terrain

situations. Furthermore, the detail of the mounting hardware (e.g. masts and booms) and

geometry for the instrument has an influence on the accuracy of the measurements. The

IEC 61400-50 series of standards set requirements on the siting and mounting of wind

measurement instruments.

In summary, the IEC 61400-50 series of standards specifies requirements and methods for the

use, calibration and classification of conventional cup anemometers (and wind vanes),

ultrasonic anemometers and remote sensing devices such that the resultant wind

measurements will be compliant in terms of accuracy and uncertainty with the use-case

requirements specified in other standards in the IEC 61400 series. Not all wind measurement

methods are compatible with all use-cases. The use-case standards define which wind

measurement method or methods are acceptable for that use-case.
6 Interfaces between standards

The decision to implement wind measurements according to the IEC 61400-50 series is usually

to satisfy a wind measurement requirement from one of the other use-case standards. In the

first editions of the IEC 61400-50 series of standards, the requirements are a direct duplication

of the wind measurement requirements from IEC 61400-12-1:2017 and IEC 61400-12-2:2013.

The wind measurement requirements have been separated out from IEC 61400-12-1:2017 and

IEC 61400-12-2:2013 into the IEC 61400-50 series whilst the remaining power performance

requirements have been transferred into a set of documents in the IEC 61400-12 series.

Figure 1 illustrates in overview the relationship between the restructured standards and the

direction of flow of information.
---------------------- Page: 11 ----------------------
– 10 – IEC 61400-50:2022 © IEC 2022
Figure 1 – Overview of relationship between standards
in the IEC 61400-12 and IEC 61400-50 series

In addition, there are other published standards in the IEC 61400 series which currently refer

to the wind measurement requirements specified in IEC 61400-12-1:2005 or

IEC 61400‑12‑1:2017. The intention is that the user should now refer to the appropriate

IEC 61400-50 series standard for those wind measurement requirements. Table 1 lists those

standards in the IEC 61400 series which currently refer to IEC 61400-12-1:2005 or

IEC 61400‑12-1:2017 for their wind measurement requirements and which standard in the

IEC 61400-50 series is the most appropriate to refer to now. As none of those standards except

IEC 61400-12-1:2017 have been updated to consider the use of RSDs for wind measurements,

the recommendation is to reference IEC 61400-50-1 and not IEC 61400-50-2 until specific

consideration is given to the suitability of RSDs for each use-case standard.
---------------------- Page: 12 ----------------------
IEC 61400-50:2022 © IEC 2022 – 11 –
Table 1 – IEC 61400 series parts which make reference to
wind measurements previously defined in IEC 61400-12-1
Wind measurement reference
Present Update to
IEC 61400 part Edition Year 50-1 50-2
-12-1 2 2017 Self x x
-12-2 1 2013 Self and 12-1 x
-1 4 2019 12-1 x
-2 3 2013 12-1 x
-11 2018 12-1, 12-2 x
3.1
-13 1 2015 12-1 x

Edition 3.1 (IEC 61400-11:2012+AMD1:2018) refers specifically to the use of nacelle anemometers for wind

speed measurement and references Part 12-2 for the specification for the mounting of that nacelle

anemometer. The guidance on nacelle anemometer mounting still resid
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.