EN IEC 61869-99:2022

SLOVENSKI STANDARD
01-februar-2023
Instrumentni transformatorji - 99. del: Slovar (IEC 61869-99:2022)
Instrument transformers - Part 99: Glossary (IEC 61869-99:2022)
Messwandler – Teil 99: Glossar (IEC 61869-99:2022)
Transformateurs de mesure - Partie 99: Glossaire (IEC 61869-99:2022)
Ta slovenski standard je istoveten z: EN IEC 61869-99:2022
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61869-99

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2022
ICS 17.220.20; 01.040.01
English Version
Instrument transformers - Part 99: Glossary
(IEC 61869-99:2022)
Transformateurs de mesure - Partie 99: Glossaire Messwandler - Teil 99: Glossar
(IEC 61869-99:2022) (IEC 61869-99:2022)
This European Standard was approved by CENELEC on 2022-12-13. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61869-99:2022 E

European foreword
The text of document 38/709/FDIS, future edition 1 of IEC 61869-99, prepared by IEC/TC 38
"Instrument Transformers" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61869-99:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-09-13
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-12-13
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61869-99:2022 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60364-1:2005 NOTE Harmonized as HD 60364-1:2008 + A11:2017
IEC 61850-7-4 NOTE Harmonized as EN 61850-7-4
IEC 61850-9-2:2011 NOTE Harmonized as EN 61850-9-2:2011 (not modified)
IEC 61869 (series) NOTE Harmonized as EN IEC 61869 (series)

IEC 61869-99 ®
Edition 1.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 99: Glossary
Transformateurs de mesure –
Partie 99: Glossaire
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.040.01; 17.220.20 ISBN 978-2-8322-5852-1

– 2 – IEC 61869-99:2022 © IEC 2022
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 Basic terms and definitions . 6
3.2 Instrument transformer types, parts and details . 9
3.3 Current aspects . 16
3.4 Voltage aspects . 18
3.5 Accuracy aspects . 20
3.6 Miscellaneous aspects . 40
Annex A (informative) Indexes . 45
A.1 Alphabetical list of terms . 45
A.2 List of symbols and abbreviated terms in alphabetical order . 50
Bibliography . 54

Table A.1 – Index of terms . 45
Table A.2 – Index of abbreviated terms and symbols . 50

IEC 61869-99:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 99: Glossary
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 61869-99 has been prepared by IEC technical committee 38: Instrument Transformers. It
is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
38/709/FDIS 38/711/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the IEC 61869 series, published under the general title Instrument
transformers, can be found on the IEC website.

– 4 – IEC 61869-99:2022 © IEC 2022
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.
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.

IEC 61869-99:2022 © IEC 2022 – 5 –
INTRODUCTION
Definitions presented in this document are definitions related to the terminology of the
IEC 61869 series and updated in terms of editorial and technical aspects according to the
official decisions of TC 38 (38/619/Q and 38/626/RQ).
TC 38 decided to start this project to develop the IEC 61869-99 Glossary as preliminary work
for revision of IEC 60050-321. The Glossary IEC 61869-99, when published, will be used as a
basis for the update of IEC 60050-321.
Definitions that are listed in this document are valid definitions and should be used for
terminology concerning instrument transformers.
The structure of this Glossary does not follow the order of product families but follows a logical
order based on the hierarchy of concepts: starting from the most general concepts and
continuing with the more specific ones.
For the purpose of better orientation in the arrangement of terminology it is helpful to use the
"Supporting document for IEC 61869-99" which is located at the following link:
https://www.iec.ch/dyn/www/f?p=103:227:::::FSP_ORG_ID:1241

– 6 – IEC 61869-99:2022 © IEC 2022
INSTRUMENT TRANSFORMERS –
Part 99: Glossary
1 Scope
This part of the IEC 61869 series contains the glossary of specific terminology and definitions
used in the field of instrument transformers within the various parts of the series. Unless it is
otherwise specified, in this document all periodic electrical quantities are understood to be RMS
values.
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 terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
NOTE See Annex A for indexes of terms, abbreviated terms, and symbols.
3.1 Basic terms and definitions
3.1.1
instrument transformer
IT
device providing a secondary signal whose instantaneous value is substantially proportional to
the instantaneous value of the primary voltage or current with a defined accuracy and intended
to feed protective, metering or control equipment
3.1.2
current sensor
CS
device providing a secondary si
...