SIST EN 61869-6:2017

SLOVENSKI STANDARD
01-februar-2017
Nadomešča:
SIST EN 60044-7:2000
SIST EN 60044-8:2003
Instrumentni transformatorji - 6. del: Dodatne splošne zahteve za instrumentne
transformatorje majhnih moči (IEC 61869-6:2016)
Instruments transformers - Part 6: Additional general requirements for Low Power
Instrument Transformers (IEC 61869-6:2016)
Ta slovenski standard je istoveten z: EN 61869-6:2016
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 61869-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2016
ICS 17.220.20 Supersedes EN 60044-7:2000 (partially),
EN 60044-8:2002 (partially)
English Version
Instrument transformers - Part 6: Additional general
requirements for low-power instrument transformers
(IEC 61869-6:2016)
Transformateurs de mesure - Partie 6: Exigences générales Messwandler - Teil 6: Zusätzliche allgemeine
supplémentaires concernant les transformateurs de mesure Anforderungen für Kleinsignal-Messwandler
de faible puissance (IEC 61869-6:2016)
(IEC 61869-6:2016)
This European Standard was approved by CENELEC on 2016-06-01. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, 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
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61869-6:2016 E
European foreword
The text of document 38/501/FDIS, future edition 1 of IEC 61869-6, prepared by IEC/TC 38
"Instrument transformers" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 61869-6:2016.
The following dates are fixed:
(dop) 2017-06-23
• 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) 2019-12-23
standards conflicting with the
document have to be withdrawn
This document is to be read jointly with, and is based on, EN 61869-1:2009, General requirements,
However, the reader is encouraged to use the most recent edition of that document.

This document follows the structure of EN 61869 series and supplements or modifies the
corresponding clauses in EN 61869-1 Standard.

When a particular clause/subclause of Part 1, is not mentioned in this Part 6, that clause/subclause
applies as far as is reasonable. When this standard states “addition”, “modification” or “replacement”,
the relevant text in Part 1 is to be adapted accordingly.

For additional clauses, subclauses, figures, tables, annexes or notes, the following numbering system
is used:
– clauses, subclauses, tables, figures and notes that are numbered starting from 601 are additional to
those in Part 1;
– additional annexes are lettered 6A, 6B, etc.

This document, jointly with EN 61869-1:2009, supersedes EN 60044-7:2000 (partially) and
EN 60044-8:2002 (partially).
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 61869-6:2016 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 standards indicated:

IEC 60044-7:1999 NOTE Harmonized as EN 60044-7:2000 (not modified).
IEC 60044-8:2002 NOTE Harmonized as EN 60044-8:2002 (not modified)
IEC 61508-1 NOTE Harmonized as EN 61508-1.
IEC 61508-3 NOTE Harmonized as EN 61508-3.
IEC 61850 Series NOTE Harmonized as EN 61850 Series.
IEC 61869 Series NOTE Harmonized as EN 61869 Series.
IEC 61869-5 NOTE Harmonized as EN 61869-5.
IEC 61869-9 NOTE Harmonized as EN 61869-9.
IEC 61869-10 NOTE Harmonized as EN 61869-10.
IEC 61869-11 NOTE Harmonized as EN 61869-11.
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
Annex ZA of EN 61869:2009 is applicable with the following additions:

Publication Year Title EN/HD Year

- - Voltage characteristics of electricity EN 50160 2010
supplied by public electricity networks
IEC 60068-2-6 2007 Environmental testing - EN 60068-2-6 2008
Part 2-6: Tests - Test Fc: Vibration
(sinusoidal)
IEC 60255-27 2013 Measuring relays and protection equipment EN 60255-27 2014
- Part 27: Product safety requirements
IEC 60603-7-1 2011 Connectors for electronic equipment - EN 60603-7-1 2011
Part 7-1: Detail specification for 8-way,
shielded, free and fixed connectors
IEC 60794-2 2002 Optical fibre cables - EN 60794-2 2003
Part 2: Indoor cables - Sectional
specification
IEC 60794-3 2014 Optical fibre cables - EN 60794-3 2015
Part 3: Outdoor cables - Sectional
specification
IEC 60812 2006 Analysis techniques for system reliability - EN 60812 2006
Procedure for failure mode and effects
analysis (FMEA)
1) 2)
IEC 61000-4-1 2006 Electromagnetic compatibility (EMC) - EN 61000-4-1 2007
Part 4-1: Testing and measurement
techniques - Overview of IEC 61000-4
series
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - EN 61000-4-2 2009
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
+A1 2007  +A1 2008
+A2 2010  +A2 2010
1)
Superseded by IEC/TR 61000-4-1:2016.
2)
Withdrawn publication.
Publication Year Title EN/HD Year

IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - EN 61000-4-4 2012
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - EN 61000-4-5 2014
Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - EN 61000-4-6 2014
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
IEC 61000-4-7 2002 Electromagnetic compatibility (EMC) - EN 61000-4-7 2002
Part 4-7: Testing and measurement
techniques - General guide on harmonics
and interharmonics measurements and
instrumentation, for power supply systems
and equipment connected thereto
+A1 2008  +A1 2009
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - EN 61000-4-8 2010
Part 4-8: Testing and measurement
techniques - Power frequency magnetic
field immunity test
3)
IEC 61000-4-9 1993 Electromagnetic compatibility (EMC) - EN 61000-4-9 1993
Part 4-9: Testing and measurement
techniques - Pulse magnetic field immunity
test
3)
+A1 2000  +A1 2001
4)
IEC 61000-4-10 1993 Electromagnetic compatibility (EMC) - EN 61000-4-10 1993
Part 4-10: Testing and measurement
techniques - Damped oscillatory magnetic
field immunity test
+A1 2000  +A1 2001
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) - EN 61000-4-11 2004
Part 4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) - EN 61000-4-13 2002
Part 4-13: Testing and measurement
techniques - Harmonics and
interharmonics including mains signaling at
a.c. power port, low frequency immunity
tests
+A1 2009  +A1 2009
3)
Superseded by EN 61000-4-9:2016 (IEC 61000-4-9:2016): DOW = 2019-08-17.
4)
Superseded by IEC 61000-4-10:2016.
Publication Year Title EN/HD Year

5)
IEC 61000-4-16 1998 Electromagnetic compatibility (EMC) - EN 61000-4-16 1998
Part 4-16: Testing and measurement
techniques - Test for immunity to
conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
+A1 2001  +A1 2004
+A2 2009  +A2 2011
IEC 61000-4-18 2006 Electromagnetic compatibility (EMC) - EN 61000-4-18 2007
Part 4-18: Testing and measurement + corr. September 2007
techniques - Damped oscillatory wave
immunity test
+A1 2010  +A1 2010
IEC 61000-4-29 2000 Electromagnetic compatibility (EMC) - EN 61000-4-29 2000
Part 4-29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61025 2006 Fault Tree Analysis (FTA) EN 61025 2007
IEC 61076-2-101 2012 Connectors for electronic equipment - EN 61076-2-101 2012
Product requirements -
Part 2-101: Circular connectors - Detail
specification for M12 connectors with
screw-locking
IEC/TS 61850-2 2003 Communication networks and systems in - -
substations -
Part 2: Glossary
IEC 61850-7-4 2010 Communication networks and systems for EN 61850-7-4 2010
power utility automation -
Part 7-4: Basic communication structure -
Compatible logical node classes and data
object classes
IEC 61869-1 (mod) 2007 Instrument transformers - EN 61869-1 2009
Part 1: General requirements
IEC 61869-2 2012 Instrument transformers - EN 61869-2 2012
Part 2: Additional requirements for current
transformers
IEC 61869-3 2011 Instrument transformers - EN 61869-3 2011
Part 3: Additional requirements for
inductive voltage transformers
IEC/TR 61869-103 2012 Instrument transformers - The use of - -
instrument transformers for power quality
measurement
IEC 62271-100 2008 High-voltage switchgear and controlgear - EN 62271-100 2009
Part 100: Alternating current circuit-
breakers
+A1 2012  +A1 2012
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
5)
Superseded by EN 61000-4-16:2016 (IEC 61000-4-16:2015): DOW = 2019-01-13.
Publication Year Title EN/HD Year

ISO/IEC/IEEE 2010 Information technology - Smart transducer - -
21451-4 interface for sensors and actuators -
Part 4: Mixed-mode communication
protocols and Transducer Electronic Data
Sheet (TEDS) formats
IEC 61869-6 ®
Edition 1.0 2016-04
INTERNATIONAL
STANDARD
colour
inside
Instrument transformers –
Part 6: Additional general requirements for low-power instrument transformers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20 ISBN 978-2-8322-3330-6

– 2 – IEC 61869-6:2016  IEC 2016
CONTENTS
FOREWORD. 6
1 Scope . 10
2 Normative reference . 10
3 Terms and definitions . 13
3.1 General terms and definitions . 13
3.2 Terms and definitions related to dielectric ratings and voltages . 17
3.3 Terms and definitions related to current ratings . 17
3.4 Terms and definitions related to accuracy . 21
3.5 Terms and definitions related to other ratings . 26
3.7 Index of abbreviations and symbols . 26
4 Normal and special service conditions . 28
4.2 Normal service conditions . 28
4.2.3 Vibrations or earth tremors . 28
4.2.601 Partially outdoor LPIT . 28
5 Ratings . 28
5.3 Rated insulation levels and voltages . 28
5.3.5 Insulation requirements for secondary terminals . 28
5.3.601 Rated auxiliary power supply voltage (U ) . 28
ar
5.4 Rated frequency . 29
5.5 Rated output . 29
5.5.601 Rated burden (R ) . 29
br
5.5.602 Standard values for the rated delay time (t ) . 29
dr
5.6 Rated accuracy class . 30
6 Design and construction . 30
6.7 Mechanical requirements . 30
6.11 Electromagnetic compatibility (EMC) . 30
6.11.3 Requirements for immunity . 30
6.11.4 Requirement for transmitted overvoltages . 32
6.11.601 Emission requirements . 32
6.13 Markings . 33
6.601 Requirements for optical transmitting system and optical output link . 33
6.601.1 General . 33
6.601.2 Optical connectors . 33
6.601.3 Fibre optic terminal box . 33
6.601.4 Total cable length . 33
6.602 Requirements for electrical transmitting system and electrical wires for
output link . 33
6.602.1 Connectors . 33
6.602.2 Earthing of the output cable. 34
6.603 Signal-to-noise ratio . 34
6.604 Failure detection and maintenance announcement . 35
6.605 Operability . 35
6.606 Reliability and dependability . 35
6.607 Vibrations . 35
7 Tests . 36
7.1 General . 36

IEC 61869-6:2016  IEC 2016 – 3 –
7.1.2 List of tests . 36
7.2 Type tests . 37
7.2.1 General . 37
7.2.2 Temperature-rise test . 37
7.2.3 Impulse voltage withstand test on primary terminals . 37
7.2.5 Electromagnetic compatibility (EMC) tests . 37
7.2.6 Test for accuracy . 41
7.2.601 Low-voltage component voltage withstand test . 43
7.3 Routine tests . 44
7.3.1 Power-frequency voltage withstand tests on primary terminals . 44
7.3.4 Power-frequency voltage withstand tests on secondary terminals . 45
7.3.5 Test for accuracy . 45
7.3.601 Power-frequency voltage withstand test for low-voltage components . 45
7.4 Special tests . 45
7.4.601 Vibration tests . 45
601 Information to be given with enquiries, tenders and orders . 46
601.1 Designation . 46
601.2 Dependability . 46
Annex 6A (normative) LPIT frequency response and accuracy requirements for
harmonics . 47
6A.1 General . 47
6A.2 Requirements for noise and distortion . 47
6A.3 Anti-aliasing filter requirements for LPIT using digital data processing . 47
6A.4 LPIT accuracy requirements for harmonics and low frequencies . 49
6A.4.1 General . 49
6A.4.2 Measuring accuracy classes . 49
6A.4.3 Accuracy class extension for quality metering and low bandwidth d.c.
applications . 50
6A.4.4 Protective accuracy classes . 51
6A.4.5 Special high bandwidth protection accuracy class . 51
6A.4.6 Special accuracy classes for d.c. coupled low-power voltage
transformers . 52
6A.5 Tests for accuracy versus harmonics and low frequencies . 52
6A.6 Test arrangement and test circuit. 53
6A.6.1 Test for accuracy for harmonics and low frequencies . 53
6A.6.2 Type test for proper anti-aliasing . 53
Annex 6B (informative) Transient performances of low-power current transformers . 55
6B.1 General . 55
6B.2 Short-circuit currents in power systems . 55
6B.3 Conventional current transformer equivalent circuit . 58
6B.4 Types of current transformers . 60
6B.4.1 Types of conventional CTs . 60
6B.4.2 Types of low-power current transformers . 61
6B.5 Transient performance of current transformers . 62
6B.5.1 Transient performance of conventional current transformers . 62
6B.5.2 Transient performance of low-power current transformers . 63
6B.6 Summary . 64
Annex 6C (informative) Transient performances of low-power voltage transformers . 65
6C.1 Overview . 65

– 4 – IEC 61869-6:2016  IEC 2016
6C.2 General . 65
6C.2.1 Defining primary and secondary voltages . 65
6C.2.2 Normal service conditions of the network . 65
6C.2.3 Abnormal service conditions of the network . 66
6C.2.4 Rated secondary voltages . 66
6C.2.5 Steady-state conditions . 66
6C.3 Transient conditions . 66
6C.3.1 Theoretical considerations . 66
6C.3.2 Definition of transient error . 73
6C.3.3 Test of transient performance . 73
Annex 6D (informative) Test circuits . 78
6D.1 Test circuits for accuracy measurements in steady state for low-power
current transformers . 78
6D.2 Test circuits for accuracy measurements in steady state for low-power
voltage transformers . 81
Annex 6E (informative) Graph explaining the accuracy requirements for multi-purpose
low-power current transformer . 84
Bibliography . 85

Figure 601 – General block diagram of a single-phase LPIT. 10
Figure 602 – Primary time constant T . 19
p
Figure 603 – Duty cycles, single energization . 20
Figure 604 – Duty cycles, double energization . 21
Figure 605 – Examples of subassembly subjected to EMC tests – Usual structure used
in HV AIS applications . 38
Figure 606 – Examples of subassembly subjected to EMC tests – Usual structure used
in MV applications . 39
Figure 607 – Examples of subassembly subjected to EMC tests – Usual structure used
in HV GIS applications . 39
Figure 608 – Temperature cycle accuracy test . 42
Figure 6A.1 – Digital data acquisition system example . 48
Figure 6A.2 – Frequency response mask for metering accuracy class 1 (f = 60 Hz, f =
r s
4 800 Hz) . 49
Figure 6B.1 – Illustration of a fault in a power system . 56
Figure 6B.2 – Short-circuit current a.c. and d.c. components . 56
Figure 6B.3 – Symmetric fault current . 57
Figure 6B.4 – Asymmetric fault current . 57
Figure 6B.5 – Equivalent electrical circuit of a conventional CT . 58
Figure 6B.6 – Flux-current characteristic for a conventional CT without remanence
representation . 59
Figure 6B.7 – Representation of hysteresis and remanent flux for a conventional CT . 60
Figure 6B.8 – Comparison of flux-current characteristics for gapped and gapless CTs . 62
Figure 6B.9 – Secondary current distorted due to the CT saturation . 63
Figure 6B.10 – AC component for non-saturated and saturated CT . 63
Figure 6C.1 – Schematic diagram explaining the trapped charge phenomena . 69
Figure 6C.2 – Voltages during trapped charges phenomena . 70
Figure 6C.3 – Modelization example of a simplified low-power voltage transformer . 72

IEC 61869-6:2016  IEC 2016 – 5 –
Figure 6C.4 – Testing arrangement for short time constant . 76
Figure 6C.5 – Testing arrangement for long time constant . 77
Figure 6C.6 – Typical waveform of e(t) during test . 77
Figure 6D.1 – Test circuit for analogue accuracy measurements in steady state . 78
Figure 6D.2 – Test circuit for analogue accuracy measurements in steady state
(alternative solution) . 79
Figure 6D.3 – Test circuit for digital accuracy measurements in steady state . 80
Figure 6D.4 – Test circuit for analogue accuracy measurements in steady state . 81
Figure 6D.5 – Test circuit for analogue accuracy measurements in steady state
(alternative solution) . 82
Figure 6D.6 – Test circuit for digital accuracy measurements in steady state . 83
Figure 6E.1 – Accuracy limits of a multi-purpose low-power current transformer . 84

Table 601 – Secondary terminal and low voltage component withstand capability . 28
Table 602 – Immunity requirements and tests . 30
Table 603 – Connectors . 34
Table 10 – List of tests . 36
Table 6A.1 – Anti-aliasing filter . 48
Table 6A.2 – Measuring accuracy classes . 50
Table 6A.3 – Accuracy classes extension for quality metering and low bandwidth d.c.
applications . 50
Table 6A.4 – Accuracy classes extension for high bandwidth d.c. applications . 51
Table 6A.5 – Protective accuracy classes . 51
Table 6A.6 – Accuracy classes for special high bandwidth protection . 52
Table 6A.7 – Accuracy classes for special d.c. coupled low-power voltage transformers . 52
Table 6A.8 – Accuracy classes for harmonics . 53
Table 6B.1 – Protective CTs . 61
Table 6C.1 – Primary short circuit . 71
Table 6C.2 – Trapped charges . 71
Table 6C.3 – Limits of instantaneous voltage error for protective electronic voltage
transformers in case of trapped charges reclose . 71

– 6 – IEC 61869-6:2016  IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 6: Additional general requirements
for low-power instrument transformers

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 61869-6 has been prepared by IEC technical committee 38:
Instrument transformers.
This first edition of IEC 61869-6 cancels and replaces the relevant parts of IEC 60044-7,
published in 1999, and of IEC 60044-8, published in 2002 .
______________
IEC 60044-7 and IEC 60044-8 will eventually be replaced by the IEC 61869 series, but until all the relevant
parts will be published, these two standards are still in force.

IEC 61869-6:2016  IEC 2016 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
38/501/FDIS 38/507/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61869 series, published under the general title Instrument
transformers, can be found on the IEC website.
This Part 6 is to be read in conjunction with, and is based on, IEC 61869-1:2007, General
Requirements - however, the reader is encouraged to use its most recent edition.
This Part 6 follows the structure of IEC 61869-1:2007 and supplements or modifies its
corresponding clauses.
When a particular clause/subclause of Part 1 is not mentioned in this Part 6, that
clause/subclause applies. When this standard states “addition”, “modification” or
“replacement”, the relevant text in Part 1 is to be adapted accordingly.
For additional clauses, subclauses, figures, tables, annexes or notes, the following numbering
system is used:
– clauses, subclauses, tables, figures and notes that are numbered starting from 601 are
additional to those in Part 1;
– additional annexes are lettered 6A, 6B, etc.
An overview of the planned set of standards at the date of publication of this document is
given below. The updated list of standards issued by IEC TC 38 is available at the website:
www.iec.ch.
– 8 – IEC 61869-6:2016  IEC 2016

PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
IEC IEC
ADDITIONAL REQUIREMENTS FOR 60044-1
61869-2
CURRENT TRANSFORMERS
60044-6
ADDITIONAL REQUIREMENTS FOR 60044-2
61869-3
INDUCTIVE VOLTAGE TRANSFORMERS

ADDITIONAL REQUIREMENTS FOR 60044-3
61869-4
COMBINED TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-5
61869-5
CAPACITOR VOLTAGE TRANSFORMERS
IEC 61869-1
ADDITIONAL REQUIREMENTS FOR 60044-7
IEC 61869-6 61869-7
GENERAL
ELECTRONIC VOLTAGE
REQUIREMENTS
ADDITIONAL
TRANSFORMERS
FOR
GENERAL
INSTRUMENT
ADDITIONAL REQUIREMENTS FOR 60044-8
REQUIREMENTS 61869-8
TRANSFORMERS
ELECTRONIC CURRENT
FOR LOW-POWER
TRANSFORMERS
INSTRUMENT
TRANSFORMERS
DIGITAL INTERFACE FOR INSTRUMENT
61869-9
TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR LOW-
61869-10
POWER PASSIVE CURRENT
TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR LOW- 60044-7
61869-11
POWER PASSIVE VOLTAGE
TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR
61869-12
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED
PASSIVE TRANSFORMERS
STAND ALONE MERGING UNIT
61869-13
ADDITIONAL REQUIREMENTS FOR
61869-14
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
ADDITIONAL REQUIREMENTS FOR DC
61869-15
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS
IEC 61869-6:2016  IEC 2016 – 9 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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.
– 10 – IEC 61869-6:2016  IEC 2016
INSTRUMENT TRANSFORMERS –
Part 6: Additional general requirements
for low-power instrument transformers

1 Scope
This part of IEC 61869 is a product family standard and covers only additional general
requirements for low-power instrument transformers (LPIT) used for a.c. applications having
rated frequencies from 15 Hz to 100 Hz covering MV, HV and EHV or used for d.c.
applications. This product standard is based on IEC 61869-1:2007, in addition to the relevant
product specific standard.
This part of IEC 61869 does not cover the specification for the digital output format of
instrument transformers.
This part of IEC 61869 defines the errors in case of analogue or digital output. The other
characteristics of the digital interface for instrument transformers are standardised in
IEC 61869-9 as an application of the standards, the IEC 61850 series, which details layered
substation communication architecture.
This part of IEC 61869 considers additional requirements concerning bandwidth. The
accuracy requirements on harmonics and requirements for the anti-aliasing filter are given in
the normative Annex 6A.4.
The general block diagram of single-phase LPITs is given in Figure 601.
According to the technology, it is not absolutely necessary that all parts described in
Figure 601 are included in the instrument transformer.
As an example, for low-power passive transformers (LPITs without active electronic
components) the blocks are composed only with passive components and there is no power
supply.
Primary Primary Transmitting Secondary
sensor converter system converter
Input signal Output signal
Primary Secondary
Power Power
supply supply
IEC
Figure 601 – General block diagram of a single-phase LPIT
2 Normative reference
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.
IEC 61869-6:2016  IEC 2016 – 11 –
Clause 2 of IEC 61869-1:2007 is applicable with the following additions:
IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration
(sinusoidal)
IEC 60255-27:2013, Measuring relays and protection equipment – Part 27: Product safety
requirements
IEC 60603-7-1:2011, Connectors for electronic equipment – Part 7-1: Detail specification for
8-way, shielded, free and fixed connectors
IEC 60794-2:2002, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 60794-3:2014, Optical fibre cables – Part 3: Outdoor cables – Sectional specification
IEC 60812:2006, Analysis techniques for system reliability – Procedure for failure mode and
effects analysis (FMEA)
IEC 61000-4-1:2006, Electromagnetic compatibility (EMC) – Part 4-1: Testing and
measurement techniques – Overview of IEC 61000-4 series
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, ind
...