SIST EN 61400-25-2:2016
(Main)Wind turbines - Part 25-2: Communications for monitoring and control of wind power plants - Information models
Wind turbines - Part 25-2: Communications for monitoring and control of wind power plants - Information models
The focus of the IEC 61400-25 series is on the communications between wind power plant
components such as wind turbines and actors such as SCADA systems. Internal
communication within wind power plant components is outside the scope of the IEC 61400-25
series.
The IEC 61400-25 series is designed for a communication environment supported by a clientserver
model. Three areas are defined, that are modelled separately to ensure the scalability
of implementations:
1) wind power plant information models,
2) information exchange model, and
3) mapping of these two models to a standard communication profile.
The wind power plant information model and the information exchange model, viewed
together, constitute an interface between client and server. In this conjunction, the wind power
plant information model serves as an interpretation frame for accessible wind power plant
data. The wind power plant information model is used by the server to offer the client a
uniform, component-oriented view of the wind power plant data. The information exchange
model reflects the whole active functionality of the server. The IEC 61400-25 series enables
connectivity between a heterogeneous combination of client and servers from different
manufacturers and suppliers.
As depicted in Figure 1, the IEC 61400-25 series defines a server with the following aspects:
– information provided by a wind power plant component, for example “wind turbine rotor
speed” or “total power production of a certain time interval”, is modelled and made
available for access;
– services to exchange values of the modelled information defined in IEC 61400-25-3;
– mapping to a communication profile, providing a protocol stack, to carry the exchanged
values from the modelled information (IEC 61400-25-4).
The IEC 61400-25 series only defines how to model the information, information exchange
and mapping to specific communication protocols. The standard excludes a definition of how
and where to implement the communication interface, the application program interface and
implementation recommendations. However, the objective of the standard is that the
information associated with a single wind power plant component (such as a wind turbine) is
accessible through a corresponding logical device.
IEC 61400-25-2 specifies the information model of devices and functions related to wind
power plant applications. In particular, it specifies the compatible logical node names, and
data names for communication between wind power plant components. This includes the
relationship between logical devices, logical nodes and data. The names defined in the
IEC 61400-25 series are used to build the hierarchical object references applied for
communicating with components in wind power plants.
This part of IEC 61400-25 specifies common attribute types and common data classes related
to wind turbine applications. In particular it specifies common data classes for:
• setpoint value,
• status value,
• alarm,
• command,
• event counting,
• state timing,
• alarm set status.
Devices implementing the information model of this part choose one or more logical nodes as
required by the application.
NOTE 1 The IEC 61400-25 series focuses on the common, non-vendor-specific information. Those information
items that tend to vary greatly between vendor-specific implementations can for example be specified in bilateral
agreements or by user groups.
NOTE 2 This part does not provide tutorial material.
Windenergieanlagen - Teil 25-2: Kommunikation für die Überwachung und Steuerung von Windenergieanlagen - Informationsmodelle
Eolienne - Partie 25-2: Communications pour la surveillance et la commande des centrales éoliennes - Modèles d’information
L'IEC 61400-25-2:2015 spécifie le modèle d'information des dispositifs et des fonctions liés aux applications des centrales éoliennes. Elle spécifie notamment les noms de noeud logique compatible et les noms de données utilisés dans la communication entre les composants des centrales éoliennes, y compris la relation entre les dispositifs logiques, les noeuds logiques et les données. Les noms définis dans la série IEC 61400-25 sont utilisés pour établir les références à un objet hiérarchique s'appliquant dans le cadre de la communication avec les composants des centrales éoliennes. Cette nouvelle édition comporte les changements importants suivants par rapport à l'édition précédente:
- l'harmonisation avec de nouvelles éditions de la série IEC 61850,
- la réduction de l'écart entre les normes et la simplification par un référencement amélioré,
- l'extension des objets de données pour fonctionnement des réseaux intelligents,
- l'extension et l'amélioration de la sémantique pour les objets de données existants, etc.
Sistemi generatorjev vetrne turbine - 25-2. del: Komunikacije za spremljanje in nadzor vetrnih elektrarn - Informacijski modeli
Skupina standardov IEC 61400-25 se osredotoča na komunikacije med komponentami vetrnih elektrarn, kot so vetrne turbine, in elementi, kot so sistemi SCADA. Komunikacije znotraj komponent vetrnih elektrarn niso zajete v skupini standardov IEC 61400-25.
Skupina standardov IEC 61400-25 je zasnovana za komunikacijsko okolje, ki ga podpira model odjemalec-strežnik. Opredeljena so tri področja, ki so oblikovana posebej, da se zagotovi nadgradljivost uporabljenih različic:
1) informacijski modeli vetrnih elektrarn,
2) model za izmenjavo informacij,
3) preslikava teh dveh modelov v standardni komunikacijski profil.
Informacijski model vetrne elektrarne in model za izmenjavo informacij skupaj sestavljata vmesnik med odjemalcem in strežnikom. Informacijski model vetrne elektrarne se uporablja kot okvir za interpretacijo dostopnih podatkov vetrne elektrarne. Strežnik uporablja informacijski model vetrne elektrarne, da odjemalcu ponuja enoten pregled podatkov vetrne elektrarne, ki je osredotočen na komponente elektrarne. Model za izmenjavo informacij predstavlja aktivne funkcije strežnika. Skupina standardov IEC 61400-25 omogoča povezljivost med raznolikimi odjemalci in strežniki različnih proizvajalcev in dobaviteljev.
Kot prikazuje slika 1, skupina standardov IEC 61400-25 opredeljuje strežnik z naslednjimi vidiki:
– informacija, ki jo posreduje komponenta vetrne elektrarne, na primer »hitrost rotorja vetrne turbine« ali »skupna proizvodnja energije v določenem časovnem intervalu«, se modelira in postane dostopna;
– storitve za izmenjavo vrednosti modelirane informacije so opredeljene v standardu IEC 61400-25-3;
– preslikava v komunikacijski profil, kar zagotavlja sklad protokolov za prenos izmenjanih vrednosti iz modelirane informacije (IEC 61400-25-4).
Skupina standardov IEC 61400-25 opredeljuje samo način modeliranja informacij, izmenjavo informacij in preslikavo v določen komunikacijski protokol. Standard ne določa, kako in kje je treba izvesti komunikacijski vmesnik, programski vmesnik in priporočila za izvajanje. Vendar je cilj standarda omogočiti dostop do informacij posamezne komponente vetrne elektrarne (na primer vetrne turbine) prek ustrezne logične naprave.
Standard IEC 61400-25-2 določa informacijski model naprav in funkcij, povezanih z aplikacijami vetrnih elektrarn. Določa zlasti imena združljivih logičnih vozlišč in imena podatkov za komunikacijo med komponentami vetrne elektrarne. Sem spada razmerje med logičnimi napravami, logičnimi vozlišči in podatki. Imena, določena v skupini standardov IEC 61400-25, se uporabljajo za izdelavo hierarhičnih sklicev na predmete, ki se uporabljajo za komunikacijo s komponentami v vetrnih elektrarnah.
Ta del standarda IEC 61400-25 določa običajne vrste atributov in običajne razrede podatkov, povezane z uporabo vetrnih turbin. Določa zlasti običajne razrede podatkov za:
• vrednost nastavitvene točke,
• vrednost stanja,
• alarm,
• ukaz,
• štetje dogodkov,
• časovno načrtovanje stanj,
• stanje nastavitve alarma.
Naprave, v katerih se uporablja informacijski model, opisan v tem delu, izberejo enega ali več logičnih vozlišč, kot zahteva aplikacija.
OPOMBA 1: Skupina standardov IEC 61400-25 se osredotoča na skupne informacije, ki niso vezane na določenega prodajalca. Te elemente informacij, ki se običajno zelo razlikujejo glede na uporabo, značilno za določenega prodajalca, je mogoče na primer določiti v dvostranskih pogodbah ali s strani skupin uporabnikov.
OPOMBA 2: V tem delu izobraževalno gradivo ni na voljo.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sistemi generatorjev vetrne turbine - 25-2. del: Komunikacije za spremljanje in nadzor vetrnih elektrarn - Informacijski modeliEolienne - Partie 25-2: Communications pour la surveillance et la commande des centrales éoliennes - Modèles d’informationWind turbines - Part 25-2: Communications for monitoring and control of wind power plants - Information models27.180Sistemi turbin na veter in drugi alternativni viri energijeWind turbine systems and other alternative sources of energyICS:Ta slovenski standard je istoveten z:EN 61400-25-2:2015SIST EN 61400-25-2:2016en01-april-2016SIST EN 61400-25-2:2016SLOVENSKI
STANDARDSIST EN 61400-25-2:20071DGRPHãþD
SIST EN 61400-25-2:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 61400-25-2
November 2015 ICS 27.180
Supersedes
EN 61400-25-2:2007
English Version
Wind turbines - Part 25-2: Communications for monitoring and control of wind power plants - Information models (IEC 61400-25-2:2015)
Eoliennes - Partie 25-2: Communications pour la surveillance et la commande des centrales éoliennes - Modèles d'information (IEC 61400-25-2:2015)
Windenergieanlagen - Teil 25-2: Kommunikation für die Überwachung und Steuerung von Windenergieanlagen - Informationsmodelle (IEC 61400-25-2:2015) This European Standard was approved by CENELEC on 2015-08-04. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17,
B-1000 Brussels © 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61400-25-2:2015 E SIST EN 61400-25-2:2016
EN 61400-25-2:2015 2
European foreword The text of document 88/539/FDIS, future edition 2 of IEC 61400-25-2, prepared by IEC TC 88 "Wind turbines" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61400-25-2:2015. The following dates are fixed:
• latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-05-20 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-08-04
This document supersedes EN 61400-25-2:2007. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61400-25-2:2015 was approved by CENELEC as a European Standard without any modification. SIST EN 61400-25-2:2016
EN 61400-25-2:2015 3
Annex ZA (normative)
Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 61400-25-1 -
Wind turbines -- Part 25-1: Communications for monitoring and control of wind power plants - Overall description of principles and models EN 61400-25-1 -
IEC 61400-25 series
Wind turbines EN 61400-25 series
IEC 61400-25-3 2015
Wind turbines -- Part 25-3: Communications for monitoring and control of wind power plants - Information exchange models FprEN 61400-25-3 2015
IEC 61400-25-4 -
- -
IEC 61850-5 -
Communication networks and systems for power utility automation -- Part 5: Communication requirements for functions and device models EN 61850-5 -
IEC 61850-7-1 2011
Communication networks and systems for power utility automation -- Part 7-1: Basic communication structure - Principles and models EN 61850-7-1 2011
IEC 61850-7-2 2010
Communication networks and systems for power utility automation -- Part 7-2: Basic information and communication structure - Abstract communication service interface (ACSI) EN 61850-7-2 2010
IEC 61850-7-3 2010
Communication networks and systems for power utility automation -- Part 7-3: Basic communication structure - Common data classes EN 61850-7-3 2011
IEC 61850-7-4 2010
Communication networks and systems for power utility automation -- Part 7-4: Basic communication structure - Compatible logical node classes and data object classes EN 61850-7-4 2010
ISO 639 series
Codes for the representation of names of languages - series
ISO 3166 series
Codes for the representation of names of countries and their subdivisions - series
ISO 80000-1 -
Quantities and units -- Part 1: General EN ISO 80000-1 -
IEC/TS 61400-26-1 2011
Wind turbines - Part 26-1: Time-based availability for wind turbine generating systems - -
IEEE 754 -
IEEE Standard for Binary Floating-Point Arithmetic - -
SIST EN 61400-25-2:2016
SIST EN 61400-25-2:2016
IEC 61400-25-2 Edition 2.0 2015-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Wind turbines –
Part 25-2: Communications for monitoring and control of wind power plants – Information models
Eoliennes –
Partie 25-2: Communications pour la surveillance et la commande des centrales éoliennes – Modèles d’information
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 27.180
ISBN 978-2-8322-2726-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
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. SIST EN 61400-25-2:2016 colourinside
– 2 – IEC 61400-25-2:2015 © IEC 2015 CONTENTS FOREWORD . 6 INTRODUCTION . 8 1 Scope . 9 2 Normative references. 10 3 Terms and definitions . 12 4 Abbreviated terms . 12 5 General . 15 5.1 Overview of logical node classes . 15 5.2 Use of logical node classes . 17 5.3 Extensions of the information model . 18 6 Wind power plant logical node classes . 18 6.1 System specific logical nodes . 18 6.1.1 Wind power plant common logical node class . 18 6.1.2 LN: Logical node zero Name: LLN0 . 20 6.1.3 LN: Physical device information Name: LPHD . 20 6.2 Wind power plant specific logical nodes . 21 6.2.1 LN: Wind power plant general information Name: WPPD . 21 6.2.2 LN: Wind turbine general information Name: WTUR . 22 6.2.3 LN: Wind turbine rotor information Name: WROT . 22 6.2.4 LN: Wind turbine transmission information Name: WTRM . 23 6.2.5 LN: Wind turbine generator information Name: WGEN . 24 6.2.6 LN: Wind turbine converter information Name: WCNV . 25 6.2.7 LN: Wind turbine transformer information Name: WTRF . 26 6.2.8 LN: Wind turbine nacelle information Name: WNAC . 27 6.2.9 LN: Wind turbine yawing information Name: WYAW . 28 6.2.10 LN: Wind turbine tower information Name: WTOW . 29 6.2.11 LN: Wind power plant meteorological information Name: WMET . 30 6.2.12 LN: Wind power plant alarm information Name: WALM . 31 6.2.13 LN: Wind turbine availability information
Name: WAVL . 31 6.2.14 LN: Wind power plant active power control Name: WAPC . 32 6.2.15 LN: Wind power plant reactive power control Name: WRPC . 33 6.3 Data name semantic . 34 7 Common data classes . 47 7.1 Basic concepts for common data classes (CDC) . 47 7.1.1 Categories of common data classes . 47 7.1.2 Structure of common data classes . 48 7.2 Type definitions . 50 7.2.1 General . 50 7.2.2 BasicTypes . 50 7.2.3 CommonACSITypes . 50 7.2.4 ConstructedAttributeClasses . 51 7.2.5 Originator . 54 7.3 Wind power plant specific common data classes (CDC). 55 7.3.1 General . 55 7.3.2 Setpoint value (SPV) . 56 7.3.3 Status Value (STV) . 58 SIST EN 61400-25-2:2016
IEC 61400-25-2:2015 © IEC 2015 – 3 –
7.3.4 Alarm (ALM) . 58 7.3.5 Command (CMD) . 60 7.3.6 Event counting (CTE) . 61 7.3.7 State timing (TMS) . 63 7.3.8 Alarm Set Status (AST) . 65 7.4 Common data classes inherited from IEC 61850-7-3 . 65 7.4.1 CDCs from IEC 61850-7-3 (unchanged) . 65 7.4.2 CDCs from IEC 61850-7-3 (specialised) . 66 7.5 Common data class attribute semantics . 68 Annex A (informative)
Information model for statistical data
and historical statistical data . 73 A.1 General . 73 A.2 Model for statistical and historical statistical data . 73 A.3 Logical node extension for statistical data . 76 A.3.1 Data for calculation method for analogue and statistical analogue values . 76 A.3.2 Data name semantics . 76 A.4 Common data class for statistical data . 78 A.4.1 Object reference setting group common data class (ORG) . 78 Annex B (normative)
Value range for units and multiplier . 80 Annex C (normative)
Logical nodes for state log, analogue log and report information . 83 C.1 LN: Wind turbine state log information
Name: WSLG . 83 C.2 LN: Wind turbine analogue log information Name: WALG . 85 C.3 LN: Wind turbine report information Name: WREP . 88 Annex D (informative)
Wind power plant controller . 90 D.1 General . 90 D.2 Active power control functions . 91 D.3 Reactive power control functions . 94 Annex E (informative)
List of mandatory logical nodes and data . 97 E.1 General . 97 Annex F (informative)
Control authority management . 99 F.1 General . 99 F.2 Functional description . 99 F.2.1 Local mode . 99 F.2.2 Local mode at station level . 99 F.3 Logical Node representation . 100 F.3.1 Local mode . 100 F.3.2 Diagram description . 100 F.4 Local mode at station level . 101 F.4.1 General . 101 F.4.2 Diagram description . 101
Figure 1 – Conceptual communication model of the IEC 61400-25 series . 10 Figure 2 – Relationship of logical nodes . 15 Figure 3 – Use of instances of logical nodes . 18 Figure A.1 – Conceptual model of statistical and historical statistical data (1) . 74 Figure A.2 – Conceptual model of statistical and historical statistical data (2) . 75 SIST EN 61400-25-2:2016
– 4 – IEC 61400-25-2:2015 © IEC 2015 Figure D.1 – Conceptual structure of the wind power plant control functions . 90 Figure D.2 – Schematic illustration of the active
power limitation control function . 91 Figure D.3 – Schematic illustration of the gradient power control function . 92 Figure D.4 – Schematic illustration of the delta power control function . 92 Figure D.5 – Schematic illustration of a combined control –
including gradient, delta and active power limitation control . 93 Figure D.6 – Schematic illustration of the apparent power control function . 93 Figure D.7 – Schematic illustration of the reactive power control function . 94 Figure D.8 – Schematic illustration of the power factor control function . 95 Figure D.9 – Schematic illustration of the voltage control function
using reactive power control . 96 Figure F.1 – Local mode . 100 Figure F.2 – Local mode at station level . 101
Table 1 – System specific logical nodes . 15 Table 2 – Wind power plant general logical nodes . 16 Table 3 – Logical nodes for modelling a wind turbine . 16 Table 4 – Logical nodes for modelling a non-turbine device . 17 Table 5 – Wind power plant common logical node class . 19 Table 6 – Logical node zero class . 20 Table 7 – Physical device information class . 21 Table 8 – LN: Wind power plant general information (WPPD) . 21 Table 9 – LN: Wind turbine general information (WTUR) . 22 Table 10 – LN: Wind turbine rotor information (WROT) . 23 Table 11 – LN: Wind turbine transmission information (WTRM) . 24 Table 12 – LN: Wind turbine generator information (WGEN). 25 Table 13 – LN: Wind turbine converter information (WCNV) . 26 Table 14 – LN: Wind turbine transformer information (WTRF) . 27 Table 15 – LN: Wind turbine nacelle information (WNAC) . 28 Table 16 – LN: Wind turbine yawing information (WYAW) . 29 Table 17 – LN: Wind turbine tower information (WTOW) . 29 Table 18 – LN: Wind power plant meteorological information (WMET) . 30 Table 19 – LN: Wind power plant alarm information (WALM) . 31 Table 20 – LN: Wind turbine availability (WAVL) . 32 Table 21 – LN: Wind power plant active power control information (WAPC) . 33 Table 22 – LN: Wind power plant reactive power control information (WRPC) . 34 Table 23 – Data name semantic . 35 Table 24 – General table structure of a common data class (CDC) . 48 Table 25 – Common data class attributes . 49 Table 26 – Conditions for the presence of an attribute . 49 Table 27 – Basic types . 50 Table 28 – AnalogueValue . 51 Table 29 – TimeStamp type . 52 Table 30 – TimeQuality definition . 53 SIST EN 61400-25-2:2016
IEC 61400-25-2:2015 © IEC 2015 – 5 –
Table 31 – TimeAccuracy . 53 Table 32 – Quality . 54 Table 33 – Unit . 54 Table 34 – Originator . 55 Table 35 – Values for orCat . 55 Table 36 – Wind power plant specific common data classes. 56 Table 37 – CDC: Setpoint value (SPV) . 57 Table 38 – CDC: Status Value (STV) . 58 Table 39 – CDC: Alarm (ALM) . 59 Table 40 – CDC: Command (CMD) . 61 Table 41 – CDC: Event counting (CTE) . 62 Table 42 – CDC: State timing (TMS) . 64 Table 43 – CDC: Alarm Set Status (AST) . 65 Table 44 – Specialized common data classes . 66 Table 45 – Wind power plant device name plate
common data class specification WDPL . 67 Table 46 – Common data class attribute semantic . 68 Table A.1 – Description of Data . 77 Table A.2 – Object reference setting group common data class specification. 78 Table B.1 – SI units: base units . 80 Table B.2 – SI units: derived units . 80 Table B.3 – SI units: extended units . 81 Table B.4 – SI units: industry specific units. 81 Table B.5 – Multiplier . 82 Table C.1 – LN: Wind turbine state log information (WSLG) . 84 Table C.2 – LN: Wind turbine analogue log information (WALG) . 86 Table C.3 – LN: Wind turbine report information (WREP) . 89 Table E.1 – Mandatory system specific logical nodes . 97 Table E.2 – Mandatory wind turbine specific logical nodes . 97 Table E.3 – Mandatory wind power plant specific common data classes (CDC) . 97 Table E.4 – Mandatory common data classes inherited from IEC 61850-7-3 . 97 Table E.5 – Mandatory common data classes inherited
from IEC 61850-7-3 and specialised . 98
SIST EN 61400-25-2:2016
– 6 – IEC 61400-25-2:2015 © IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
WIND TURBINES –
Part 25-2: Communications for monitoring and
control of wind power plants – Information models
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.
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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. International Standard IEC 61400-25-2 has been prepared by IEC technical committee 88: Wind turbines.
The text of this standard is based on the following documents: FDIS Report on voting 88
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