SIST EN 61400-25-1:2018

SLOVENSKI STANDARD
01-februar-2018
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SIST EN 61400-25-1:2007
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Wind energy generation systems - Part 25-1: Communications for monitoring and control
of wind power plants - Overall description of principles and models (IEC 61400-25-
1:2017)
Ta slovenski standard je istoveten z: EN 61400-25-1:2017
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61400-25-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2017
ICS 27.180 Supersedes EN 61400-25-1:2007
English Version
Wind energy generation systems -
Part 25-1: Communications for monitoring and control of wind
power plants - Overall description of principles and models
(IEC 61400-25-1:2017)
Systèmes de génération d'énergie éolienne -  Windenergieanlagen - Teil 25-1: Kommunikation für die
Partie 25-1: Communications pour la surveillance et la Überwachung und Steuerung von Windenergieanlagen -
commande des centrales éoliennes - Description globale Einführende Beschreibung der Prinzipien und Modelle
des principes et des modèles (IEC 61400-25-1:2017)
(IEC 61400-25-1:2017)
This European Standard was approved by CENELEC on 2017-08-24. 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, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61400-25-1:2017 E
European foreword
The text of document 88/587/CDV, future edition 2 of IEC 61400-25-1, prepared by IEC/TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 61400-25-1:2017.

The following dates are fixed:
(dop) 2018-06-01
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-12-01
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61400-25-1:2007.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 61400-25-1:2017 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 61850 Series NOTE Harmonized as EN 61850 Series.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year

IEC 61400-25 Series Wind turbines - EN 61400-25 Series
Part 25: Communications for monitoring
and control of wind power plants
IEC 61400-25-2 2015 Wind turbines - EN 61400-25-2 2015
Part 25-2: Communications for monitoring
and control of wind power plants -
Information models
IEC 61400-25-3 2015 Wind turbines - EN 61400-25-3 2015
Part 25-3: Communications for monitoring
and control of wind power plants -
Information exchange models
IEC 61400-25-4 - Wind energy generation systems - EN 61400-25-4 -
Part 25-4: Communications for monitoring
and control of wind power plants - Mapping
to communication profile
IEC 61400-25-6 -  Wind energy generation systems - EN 61400-25-6 -
Part 25-6: Communications for monitoring
and control of wind power plants - Logical
node classes and data classes for
condition monitoring
IEC 61850-7-1 2011 Communication networks and systems for EN 61850-7-1 2011
power utility automation -
Part 7-1: Basic communication structure -
Principles and models
IEC 61850-7-2 2010 Communication networks and systems for EN 61850-7-2 2010
power utility automation -
Part 7-2: Basic information and
communication structure - Abstract
communication service interface (ACSI)

IEC 61400-25-1 ®
Edition 2.0 2017-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –

Part 25-1: Communications for monitoring and control of wind power plants –

Overall description of principles and models

Systèmes de génération d’énergie éolienne –

Partie 25-1: Communications pour la surveillance et la commande des centrales

éoliennes – Description globale des principes et des modèles

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-4363-3

– 2 – IEC 61400-25-1:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 11
4 Abbreviated terms . 15
5 Overall description of IEC 61400-25 (all parts). 16
5.1 General . 16
5.2 Top-down view on wind power plants . 16
5.2.1 Definition of wind power plants . 16
5.2.2 Wind power plant components . 16
5.3 Generic requirements on communication . 18
5.3.1 Communication capability . 18
5.3.2 Communication content . 18
5.3.3 Communication functions . 19
5.4 Communication model of IEC 61400-25 (all parts) . 20
5.4.1 General . 20
5.4.2 Information model . 20
5.4.3 Information exchange model and relation to wind power plant
information models . 22
5.4.4 Mapping to communication profile . 23
6 Wind power plant information model . 23
6.1 General . 23
6.2 Information modelling methodology . 23
6.2.1 Wind power plant information . 23
6.2.2 Modelling approach . 24
6.2.3 Logical devices . 26
6.2.4 Logical nodes . 26
7 Wind power plant information exchange model . 27
7.1 General . 27
7.2 Information exchange modelling methodology . 27
7.2.1 Wind power plant information exchange . 27
7.2.2 Service models . 28
7.2.3 Abstract communication service interface . 29
7.2.4 Service modelling convention . 31
8 Mapping to communication protocols . 34
8.1 General . 34
8.2 Architecture of the mappings. 34
8.3 Mapping of the wind power plant information model . 35
Bibliography . 36

Figure 1 – Conceptual communication model of the IEC 61400-25 series . 10
Figure 2 – Data processing by the server (conceptual) . 21
Figure 3 – Modelling approach (conceptual) . 22
Figure 4 – Structure of wind power plant information model . 25

IEC 61400-25-1:2017 © IEC 2017 – 3 –
Figure 5 – Role of common data classes (CDC) in WPP information model . 25
Figure 6 – Client and server role . 28
Figure 7 – IEM service models . 28
Figure 8 – Conceptual information exchange model for a wind power plant . 30
Figure 9 – IEM service model with examples . 32
Figure 10 – Sequence diagram . 33
Figure 11 – ACSI mapping to communication stacks/profiles . 34
Figure 12 – Communication profiles . 35

Table 1 – Operational functions . 19
Table 2 – Management functions . 20
Table 3 – Wind power plant information categories . 24
Table 4 – General table structure of a logical node (LN) . 26
Table 5 – Data class attributes in a logical node . 27
Table 6 – Service table . 32

– 4 – IEC 61400-25-1:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND ENERGY GENERATION SYSTEMS –

Part 25-1: Communications for monitoring and control of
wind power plants – Overall description of principles and 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.
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.
International Standard IEC 61400-25-1 has been prepared by IEC technical committee 88:
Wind energy generation systems.
This second edition cancels and replaces the first edition published in 2006. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) general harmonization of text and overview models with the other parts of the
IEC 61400-25 series,
b) harmonization of definitions in other related standards.

IEC 61400-25-1:2017 © IEC 2017 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
88/587/CDV 88/622/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The title of TC 88 was changed in 2015 from Wind turbines to Wind energy generation
systems.
A list of all parts in the IEC 61400 series, published under the general titles Wind turbines and
Wind energy generation systems can be found on the IEC website.
The users of IEC 61400-25 have formed a community, USE61400-25. For further information
see http://www.use61400-25.com.
Attached to the release of the IEC 61400-25 standard series and in addition to the standard
IEC maintenance process, a specific maintenance process is set up to handle technical
issues raised after publication. Here are the main principles:
• Technical issues (called TISSUES) are collected from the release of the new document in
cooperation with the user group for the IEC 61400-25 standard series USE61400-25.
• The collected TISSUES can be categorized in two groups:
– TISSUES that can threaten interoperability between implementations of the standard
and that need either corrections or clarifications (“IntOp” TISSUES),
– TISSUES that propose new features that will be implemented in future versions of the
standard (“next edition” TISSUES).
• IntOp TISSUES require immediate clarification and are following a transparent fixing
process handled by the user group for the IEC 61400-25 standard series together with the
editors of the IEC 61400-25 standard series.
• The detailed specification of this process, the list of TISSUES, associated fix, their status
and impact on implementation and certification are accessible through the USE61400-25
web site http://www.use61400-25.com.
• IEC recommends implementing the proposed fixes to IntOp TISSUES, as soon as they
have reached the “green” status. The list of TISSUES which are implemented in an
intelligent electronic device (IED) should be transparently stated by its manufacturer.

– 6 – IEC 61400-25-1:2017 © IEC 2017
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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 publication 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.
IEC 61400-25-1:2017 © IEC 2017 – 7 –
INTRODUCTION
IEC 61400-25 (all parts) is intended for vendors (manufacturers, suppliers), operators,
owners, planners, and designers of wind power plants as well as system integrators and utility
companies operating in the wind energy market. IEC 61400-25 (all parts) is intended to be
accepted and to be used world-wide as the international standard for communications in the
domain of wind power plants.
IEC 61400-25 (all parts) has been developed in order to provide a uniform communications
basis for the monitoring and control of wind power plants. It defines wind power plant specific
information, the mechanisms for information exchange and the mapping to communication
protocols. In this regard, IEC 61400-25 (all parts) defines details required to exchange the
available information with wind power plant components in a manufacturer-independent
environment. This is done by definitions made in this part of IEC 61400-25 or by reference to
other standards.
The wind power plant specific information describes the crucial and common process and
configuration information. The information is hierarchically structured and covers for example
common information found in the rotor, generator, converter, grid connection and the like. The
information may be simple data (including timestamp and quality) and configuration values or
more comprehensive attributes and descriptive information, for example engineering unit,
scale, description, reference, statistical or historical information. All information of a wind
power plant defined in IEC 61400-25 (all parts) is name tagged. A concise meaning of each
data is given. The standardized wind power plant information can be extended by means of a
name space extension rule. All data, attributes and descriptive information can be exchanged
by corresponding services.
The implementation of IEC 61400-25 (all parts) allows SCADA systems (supervisory control
and data acquisition) to communicate with wind turbines from multiple vendors. The
standardized self-description (contained either in an XML file or retrieved online from a
device) can be used to configure SCADA applications. Standardization of SCADA applications
are excluded in IEC 61400-25 (all parts) but standardized common wind turbine information
provides means for re-use of applications and operator screens for wind turbines from
different vendors. From a utility perspective, unified definitions of common data minimize
conversion and re-calculation of data values for evaluation and comparison of all their wind
power plants.
IEC 61400-25 (all parts) can be applied to any wind power plant operation concept, i.e. both
individual wind turbines, clusters and more integrated groups of wind turbines. The application
area of IEC 61400-25 (all parts) covers components required for the operation of wind power
plants, i.e. not only the wind turbine generator, but also the meteorological system, the
electrical system, and the wind power plant management system. The wind power plant
specific information in IEC 61400-25 (all parts) excludes information associated with feeders
and substations. Substation communication is covered within IEC 61850 (all parts).
The intention of IEC 61400-25 (all parts) is to enable components from different vendors to
communicate with other components, at any location. Object-oriented data structures can
make the engineering and handling of large amounts of information provided by wind power
plants less time-consuming and more efficient. IEC 61400-25 (all parts) supports scalability,
connectivity, and interoperability.
IEC 61400-25 (all parts) is a basis for simplifying the contracting of the roles the wind turbine
and SCADA systems have to play. The crucial part of the wind power plant information, the
information exchange methods, and the communication stacks are standardized. They build a
basis to which procurement specifications and contracts could easily refer.

– 8 – IEC 61400-25-1:2017 © IEC 2017
IEC 61400-25 is organized in several parts.
• IEC 61400-25-1 offers an introductory orientation, crucial requirements, and a modelling
guide.
• IEC 61400-25-2 and IEC61400-25-6 contain the description of the information model, a
uniform, component-oriented view of the wind power plant data, including extensions for
condition monitoring.
• IEC 61400-25-3 describes the information exchange model. It reflects the functionality of
the server.
• IEC 61400-25-4 presents five alternative mappings of the information model and
information exchange model to a standard communication profile. The choice depends on
the application and the functionality and performance needed.
• IEC 61400-25-5 describes test cases for conformance testing of implementations.
NOTE Performance of IEC 61400-25 (all parts) implementations are application specific. IEC 61400-25 (all parts)
does not guarantee a certain level of performance. This is beyond the scope of IEC 61400-25 (all parts). However,
there is no underlying limitation in the communications technology to prevent high speed application (millisecond
level responses).
IEC 61400-25-1:2017 © IEC 2017 – 9 –
WIND ENERGY GENERATION SYSTEMS –

Part 25-1: Communications for monitoring and control of
wind power plants – Overall description of principles and models

1 Scope
The focus of IEC 61400-25 (all parts) 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 beyond the scope of
IEC 61400-25 (all parts).
IEC 61400-25 (all parts) is designed for a communication environment supported by a client-
server 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. IEC 61400-25 (all parts) enables
connectivity between a heterogeneous combination of client and servers from different
manufacturers and suppliers.
As depicted in Figure 1, IEC 61400-25 (all parts) 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. The information modelled in IEC 61400-25 (all parts) is defined in
IEC 61400-25-2 and IEC 61400-25-6,
– 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).
IEC 61400-25 (all parts) only defines how to model the information, information exchange and
mapping to specific communication protocols. IEC 61400-25 (all parts) excludes a definition of
how and where to implement the communication interface, the application program interface
and implementation recommendations. However, the objective of IEC 61400-25 (all parts) is
that the information associated with a single wind power plant component (such as a wind
turbine) is accessible through a corresponding logical device.
This part of IEC 61400-25 gives an overall description of the principles and models used in
IEC 61400-25 (all parts).
NOTE IEC 61400-25 (all parts) 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, in user groups, or in amendments to IEC 61400-25 (all parts).

– 10 – IEC 61400-25-1:2017 © IEC 2017
Communication model of the IEC 61400-25 series
Client Server
Messaging
Information exchange Information exchange
through mapping
model (get, set, report, model (get, set, report,
to communication
log, control, etc.) profile (Read, log, control, etc.)

write, … message)
Defined in Defined in
Wind power
Actor
Defined in
IEC 61400-25-3 IEC 61400-25-3
plant
e.g.
IEC 61400-25-4
SCADA component
e.g. wind turbine
Wind power plant Wind power plant
information model information model

(rotor speed, brake
Defined in
status, total power
IEC 61400-25-2 and
Application Application
production, etc)
IEC 61400-25-6
Defined in
IEC 61400-25-2 and
Outside
IEC 61400-25-6
Outside
scope
scope
IEC
Figure 1 – Conceptual communication model of the
IEC 61400-25 series
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 61400-25 (all parts), Wind turbines – Part 25: Communications for monitoring and control
of wind power plants
IEC 61400-25-2:2015, Wind turbines – Part 25-2: Communications for monitoring and control
of wind power plants – Information models
IEC 61400-25-3:2015, Wind turbines – Part 25-3: Communications for monitoring and control
of wind power plants – Information exchange models
IEC 61400-25-4, Wind energy generation systems – Part 25-4: Communications for monitoring
and control of wind power plants – Mapping to communication profile
IEC 61400-25-6, Wind energy generation systems – Part 25-6: Communications for monitoring
and control of wind power plants – Logical node classes and data classes for condition
monitoring
IEC 61850-7-1:2011, Communication networks and systems for power utility automation –
Part 7-1: Basic communication structure – Principles and models
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)
IEC 61400-25-1:2017 © IEC 2017 – 11 –
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
actor
role a system plays in the context of monitoring and control, while it is not directly involved in
wind power plant operation, such as supervisory control and data acquisition system (SCADA)
Note 1 to entry: There are many other designations for example central management system, monitoring and
control system, remote control system
3.2
alarm
wind power plant state information
statement of safety intervention by the wind turbine control system (i.e. on/off)
3.3
characteristic values
properties of analogue information (min., max., avg, dev, etc.)
3.4
command
controllable data for system behaviour
EXAMPLE Enable/disable, activate/deactivate.
3.5
communication function
function used by an actor to configure, perform and monitor the information exchange with
wind power plants
EXAMPLE Operational function, management function.
3.6
control
operational function used for changing and modifying, intervening, switching, controlling,
parameterization and optimizing of wind power plants
3.7
counting value
total number of occurrences of a specific event
3.8
data retrieval
operational function used for collecting of wind power plant data
3.9
diagnostics
management function used to set up and provide for self-monitoring of the communication
system
– 12 – IEC 61400-25-1:2017 © IEC 2017
3.10
electrical system
set of electrical components working together as parts of a wind turbine or wind farm for
collecting and transmitting the produced electricity in a wind power plant
3.11
event
state transition (status, alarm, command)
3.12
intelligent electronic device
IED
any device incorporating one or more processors, with the capability to receive data from an
external sender or to send data to an external receiver
EXAMPLE Wind turbine controller.
Note 1 to entry: An IED may have connections as a client, or as a server, or both, with other IEDs.
Note 2 to entry: This note only applies to the French language.
3.13
information
content of communication
Note 1 to entry: The basic element is raw data from the wind power plant components, which shall be processed
into specified information according to IEC 61400-25 (all parts).
Note 2 to entry: Wind power plant information categories are: source information (analogue and state
information), derived information (statistical and historical information). Information is defined as data (usually
processed and derived data, and information describing other data).
3.14
information exchange
communication process between two systems, such as wind power component and actor, with
the goal to provide and to get relevant information
Note 1 to entry: Information exchange requires specific communication functions, consisting of one or more
services.
3.15
information model
model representing knowledge concerning functions and devices in which the functions are
implemented
Note 1 to entry: This knowledge is made visible and accessible through the means of IEC 61400-25 (all parts).
The model describes in an abstract way a communication oriented representation of a real function or device.
3.16
log
historical information
Note 1 to entry: Log is a chronological list of source information for a period of time.
3.17
logging
operational function
Note 1 to entry: Logging is the praxis of recording sequential data, often chronologically. The result of logging is a
log.
IEC 61400-25-1:2017 © IEC 2017 – 13 –
3.18
logical device
entity that represents a set of typical wind power plant functions
3.19
management function
function required for the administration of the information exchange in a certain level
Note 1 to entry: Management functions are user/access management, time synchronization, diagnostics, and
configuration.
3.20
mandatory
provided in compliance to IEC 61400-25 (all parts)
3.21
measured data
sampled value of a process quantity with associated data attributes such as time stamp and
quality
3.22
meteorological system
component of a wind power plant responsible for the monitoring of the ambient conditions, for
example the wind speed, wind direction, pressure, temperature
Note 1 to entry: It supplies data for various purposes for example to correlate the meteorological data to the
electrical energy output by individual wind turbines to the potentially usable wind energy.
3.23
monitoring
operational function used for local or remote observation of a system or a process for any
changes which may occur over time
Note 1 to entry: The term can also be used for observation of the behaviour of a data value or a group of data
values.
3.24
operational function
function to obtain information and to send instructions for the normal daily operation of wind
power plants
Note 1 to entry: Types of operational function are: monitoring, logging, reporting, data retrieval, control.
3.25
optional
optionally provided in compliance with IEC 61400-25 (all parts)
3.26
parameter
controllable information intended for obtaining or correcting a system behaviour
3.27
processed data
measured value, with the associated data attributes such as time stamp and quality, which
has been processed according to the calculation method attribute
3.28
profile(s)
format(s) used by a particular protocol to transmit data objects or commands, etc.

– 14 – IEC 61400-25-1:2017 © IEC 2017
3.29
protocol stack
particular software implementation of a computer networking protocol suite
Note 1 to entry The terms are often used interchangeably. Strictly speaking, the suite is the definition of the
protocols and the stack is the software implementation of them.
3.30
report
actual information sent by the function reporting
Note 1 to entry: A report can contain all kinds of information defined in IEC 61400-25-2.
3.31
reporting
operational function to transfer data from a server to a client, initiated by a server application
process
3.32
supervisory control and data acquisition
SCADA
system based on a processor unit which receives information from IEDs, determines the
control requirements and sends commands to IEDs
Note 1 to entry: SCADA is a computer system that for example dispatchers use to monitor the power distribution
throughout a service or control area.
Note 2 to entry: This note only applies to the French language.
3.33
status
state condition of a component or system (st1/st2/.stn)
3.34
statistical information
result of applying a statistical algorithm to a set of data in order to get, for example, minimum,
maximum, mean standard deviation
3.35
timing data
time duration of a specific state
3.36
time synchronization
coordination of occurrences to operate in unison with respect to time
Note 1 to entry: This process can be a premeditated arrangement set forth on a parallel time scape, or it can be
an observable coincidence in eventuality.
3.37
three phase data
measured value in a three phase electrical circuit with associated data attributes such as time
stamp, quality and calculation method
3.38
transient log
event triggered chronological list of high resolution information for a short period of time
(event driven report)
IEC 61400-25-1:2017 © IEC 2017 – 15 –
3.39
user/access management
management function used for setting up, modifying, deleting users (administratively),
assigning access rights (administratively) and monitoring access
Note 1 to entry: A management function does not necessarily include communication services.
3.40
wind power plant
complete system consisting of any number of technical subsystems referred to in
IEC 61400-25 (all parts) as wind power plant components, for example one or more wind
turbines
Note 1 to entry: The main objective of a wind power plant is to generate electrical energy from the wind.
3.41
wind power plant analogue information
continuous information concerning the actual condition or behaviour of a component or
system
EXAMPLE Measured value, processed value, three phase value, setpoint, parameter.
3.42
wind power plant component
technical system employed in the operation of wind power plants, such as wind turbine,
meteorological, electrical and wind power plant management system
3.43
wind power plant management system
component of a wind power plant, which is responsible for ensuring that the complete system
adapts itself to the static and dynamic conditions and requirements of the electrical power
connection (i.e., interoperation of the WTs with substation and other power network related
devices)
Note 1 to entry: A wind power plant management system may include other functions (e.g. Shadow control
functionality, noise or sound reduction, ice warning, lightning protection) not modelled in IEC 61400-25 (all parts).
3.44
wind turbine
main component of a wind power plant
Note 1 to entry: It is responsible for generating energy and meets the task of using the wind potential of a certain
location that converts kinetic wind energy into electric energy.
4 Abbreviated terms
ACSI abstract communication service interface
CDC common data class
CMS condition monitoring system
DC data class
DNP3 distributed network protocol version 3
IED intelligent electronic device
IEM information exchange model
LCB log control block
LD logical device
LN logical node
O&M operation and maintenance
– 16 – IEC 61400-25-1:2017 © IEC 2017
OSI open systems interconnection
RCB report control block
SCADA supervisory control and data acquisition
SCSM specific communication service mapping
WPP wind power plant
WT wind turbine
XML extensible mark-up language

5 Overall description of IEC 61400-25 (all parts)
5.1 General
The main objective of IEC 61400-25 (all parts) is to create a standard basis for manufacturer-
independent communications for monitoring and control. Manufacturers and suppliers of wind
power plant components shall implement IEC 61400-25 (all parts) in their devices and
systems.
Clause 5 provides a general overview of the context, models, modelling approach, and
application possibilities of IEC 61400-25 (all parts).
Subclause 5.2 provides a top-down view on wind power plants and shows the areas where
IEC 61400-25 (all parts) can be applied. It explains what is to be understood under the term
‘wind power plant’, which operation concepts are distinguished and which components are
used to run wind power plants.
Subclause 5.3 describes the demands made with reference to the communication taking place
within the framework of the monitoring and control of wind power plants. It explains which
general communication capabilities wind power plants shall possess and which contents and
functions are required for communication.
Subclause 5.4 provides an overview of the communication model defined by
IEC 61400-25 (all parts). The server-client communication environment that served as the
basis when developing IEC 61400-25 (all parts) is introduced briefly. Next, three server-client
application topologies are introduced, illustrating the communication architectures that are
possible by way of an example. Finally, the three areas defined by IEC 61400-25 (all parts) to
be implemented as the standard for the monitoring and control of wind powe
...