EN 61869-1:2009

SLOVENSKI STANDARD
01-december-2009
Instrumentni transformatorji - 1. del: Splošne zahteve (IEC 61869-1:2007)
Instrument transformers -- Part 1: General requirements
Messwandler -- Teil 1: Allgemeine Bestimmungen
Transformateurs de mesure -- Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 61869-1:2009
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 61869-1
NORME EUROPÉENNE
September 2009
EUROPÄISCHE NORM
ICS 17.220.20
English version
Instrument transformers -
Part 1: General requirements
(IEC 61869-1:2007, modified)
Transformateurs de mesure -  Messwandler -
Partie 1: Exigences générales Teil 1: Allgemeine Anforderungen
(CEI 61869-1:2007, modifiée) (IEC 61869-1:2007, modifiziert)

This European Standard was approved by CENELEC on 2009-07-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61869-1:2009 E
Foreword
The text of document 38/360/FDIS, future edition 1 of IEC 61869-1, prepared by IEC TC 38, Instrument
transformers, was submitted to the IEC-CENELEC parallel vote and, together with a number of editorial
modifications drafted by the Technical Committee CENELEC TC 38X, Instrument transformers, to answer
the EMC Consultant’s remarks, it was approved by CENELEC as EN 61869-1 on 2009-07-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-07-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 2004/108/EC. See Annex ZZ.
IEC TC 38 decided to restructure the whole set of stand-alone standards in the IEC 60044 series and
transform it into a new set of standards composed of general requirements documents and specific
requirements documents.
This standard is the first issue of this new series and can be regarded as a Product Family standard. It
contains the general requirements for instrument transformers and shall be read in conjunction with the
relevant specific requirements standard for the instrument transformer concerned.
An overview of the planned set of standards is given below:
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
61869-2 CURRENT 60044-1
TRANSFORMERS
61869-3 INDUCTIVE VOLTAGE 60044-2
TRANSFORMERS
61869-4 COMBINED 60044-3
TRANSFORMERS
61869-5 CAPACITIVE VOLTAGE 60044-5
TRANSFORMERS
61869-1
61869-6 CURRENT 60044-6
TRANSFORMERS FOR
GENERAL
TRANSIENT
REQUIREMENTS FOR
PERFORMANCE
INSTRUMENT
TRANSFORMERS
61869-9 61869-7 ELECTRONIC 60044-7
VOLTAGE
ADDITIONAL
TRANSFORMERS
REQUIREMENTS AND
DIGITAL INTERFACE
61869-8 ELECTRONIC 60044-8
FOR ELECTRONIC
CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
61869-10 LOW-POWER STAND-
ALONE CURRENT
SENSORS
- 3 - EN 61869-1:2009
This standard covers all general requirements formerly found in the stand-alone standards of the
EN 60044 series. Additionally, it introduces some technical innovations:
– requirements for gas-insulated instrument transformers,
– additional special tests,
– requirements for internal arc fault protection,
– requirements for degrees of protection by enclosure,
– requirements for resistance to corrosion,
– requirements for safety and environmental concerns.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61869-1:2007 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
6 Design and construction
6.11.1 Replace the second paragraph by:
For instrument transformers the following EMC requirements and tests are specified:
– requirements for emission, Radio Interference Voltage (RIV) included for high voltage parts of the
equipment.;
– requirements for immunity, only applicable to electronic parts of the equipment;
– requirements for transmitted overvoltages.
6.11.2 Delete the note.
6.11.3 Replace the second paragraph by:
Refer to specific product standards for details.
7 Tests
7.2.5.2 Replace the text of this subclause by:
Refer to specific product standards for details.
Bibliography
Add the following notes for the standards indicated:
IEC 60038 NOTE  Harmonized as HD 472 S2:1989 (modified), with the following title “Nominal voltages for low-voltage
public electricity supply systems”
IEC 60068-2 NOTE  Harmonized in EN 60068-2 series (not modified).
IEC 60071-2 NOTE  Harmonized as EN 60071-2:1997 (not modified).
IEC 60255-22-1 NOTE  Harmonized as EN 60255-22-1:2008 (not modified).
IEC 60565 NOTE  Harmonized as EN 60565:2007 (not modified).
IEC 60599 NOTE  Harmonized as EN 60599:1999 (not modified).
IEC 60660 NOTE  Harmonized as EN 60660:1999 (not modified).
IEC 60664-1 NOTE  Harmonized as EN 60664-1:2007 (not modified).
IEC 60869 NOTE  Harmonized in EN 60869 series (not modified).
IEC 61000 NOTE  Harmonized in EN 61000 series (modified).
IEC 61109 NOTE  Harmonized as EN 61109:2008 (not modified).
IEC 61161 NOTE  Harmonized as EN 61161:2007 (not modified).
IEC 61181 NOTE  Harmonized as EN 61181:2007 (not modified).
IEC 62271-100 NOTE  Harmonized as EN 62271-100:2009 (not modified).
CISPR 11 NOTE  Harmonized as EN 55011:2007 (modified).
CISPR 16-1-1 NOTE  Harmonized as EN 55016-1-1:2007 (not modified).
ISO 9001 NOTE  Harmonized as EN ISO 9001:2008 (not modified).
__________
- 5 - EN 61869-1:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 60060-1 - High-voltage test techniques - HD 588.1 S1 1991
Part 1: General definitions and test
requirements
1) 2)
IEC 60068-2-11 - Environmental testing - EN 60068-2-11 1999
Part 2: Tests - Test Ka: Salt mist

1) 2)
IEC 60068-2-17 - Environmental testing - EN 60068-2-17 1994
Part 2: Tests - Test Q: Sealing

1) 2)
IEC 60068-2-75 - Environmental testing - EN 60068-2-75 1997
Part 2-75: Tests - Test Eh: Hammer tests

1) 2)
IEC 60071-1 - Insulation co-ordination - EN 60071-1 2006
Part 1: Definitions, principles and rules

1) 2)
IEC 60085 - Electrical insulation - Thermal evaluation EN 60085 2008
and designation
1) 2)
IEC 60270 - High-voltage test techniques - Partial EN 60270 2001
discharge measurements
1) 2)
IEC 60296 - Fluids for electrotechnical applications - EN 60296 2004
Unused mineral insulating oils for + corr. September 2004
transformers and switchgear
1) 2)
IEC 60376 - Specification of technical grade sulfur EN 60376 2005
hexafluoride (SF ) for use in electrical
equipment
IEC 60417 Data- Graphical symbols for use on equipment - -
base
IEC 60455 Series Resin based reactive compounds used for EN 60455 Series
electrical insulation
1) 2)
IEC 60480 - Guidelines for the checking and treatment of EN 60480 2004
sulphur hexafluoride (SF ) taken from
electrical equipment and specification for its
re-use
1) 2)
IEC 60529 - Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993

1) 2)
IEC 60567 - Oil-filled electrical equipment - Sampling of EN 60567 2005
gases and of oil for analysis of free and
dissolved gases - Guidance
1)
Undated reference.
2)
Valid edition at date of issue.

Publication Year Title EN/HD Year

1) 3)
IEC 60694 - Common specifications for high-voltage EN 60694 1996
switchgear and controlgear standards + corr. May 1999

1) 2)
IEC 60695-1-1 - Fire hazard testing - EN 60695-1-1 2000
Part 1-1: Guidance for assessing the fire
hazard of electrotechnical products - General
guidelines
1) 2)
IEC 60695-1-30 - Fire hazard testing - EN 60695-1-30 2008
Part 1-30: Guidance for assessing the fire
hazard of electrotechnical products -
Preselection testing process - General
guidelines
1) 2)
IEC 60695-7-1 - Fire hazard testing - EN 60695-7-1 2004
Part 7-1: Toxicity of fire effluent - General
guidance
1) 2)
IEC 60721-3-3 - Classification of environmental conditions - EN 60721-3-3 1995
Part 3: Classification of groups of
environmental parameters and their
severities -
Section 3: Stationary use at weatherprotected
locations
1)
IEC/TR 60815 - Guide for the selection of insulators in - -
respect of polluted conditions

1) 2)
IEC 60867 - Insulating liquids - Specifications for unused EN 60867 1994
liquids based on synthetic aromatic
hydrocarbons
1) 2)
IEC 61462 - Composite hollow insulators - Pressurized EN 61462 2007
and unpressurized insulators for use in
electrical equipment with rated voltage greater
than 1 000 V - Definitions, test methods,
acceptance criteria and design
recommendations
4)
IEC/TR 61634 - High-voltage switchgear and controlgear - - -
Use and handling of sulphur hexafluoride
(SF ) in high-voltage switchgear and
controlgear
1) 2)
IEC 62155 (mod) - Hollow pressurized and unpressurized EN 62155 2003
ceramic and glass insulators for use in
electrical equipment with rated voltages
greater than 1 000 V
1) 2)
IEC 62262 - Degrees of protection provided by EN 62262 2002
enclosures for electrical equipment against
external mechanical impacts (IK code)

1) 5)
IEC 62271-2 - High-voltage switchgear and controlgear - EN 62271-2 2003
Part 2: Seismic qualification for rated voltages
of 72,5 kV and above
1) 2)
IEC 62271-203 - High-voltage switchgear and controlgear - EN 62271-203 2004
Part 203: Gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV

3)
EN 60694:1996 is superseded by EN 62271-1:2008, which is based on IEC 62271-1:2007.
4)
IEC/TR 61643 is superseded by IEC/TR 62271-303:2008, which is harmonized as CLC/TR 62271-303:2009.
5)
EN 62271-2:2003 is superseded by EN 62271-207:2007, which is based on IEC 62271-207:2007.

- 7 - EN 61869-1:2009
Publication Year Title EN/HD Year

1)
CISPR 18-2 - Radio interference characteristics of - -
overhead power lines and high-voltage
equipment -
Part 2: Methods of measurement and
procedure for determining limits

1)
IEC Guide 109 - Environmental aspects - Inclusion in - -
electrotechnical product standards

1)
ISO 3231 - Paints and varnishes - Determination of - -
resistance to humid atmospheres containing
sulphur dioxide
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Article 1 of Annex I of the EC Directive 2004/108/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directives concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
NOTE  EN 61869-1:2009 does not give presumption of conformity without another part of the standard.
___________
IEC 61869-1
Edition 1.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Instrument transformers –
Part 1: General requirements
Transformateurs de mesure –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XB
CODE PRIX
ICS 17.220.20 ISBN 2-8318-9322-4

– 2 – 61869-1 © IEC:2007
CONTENTS
FOREWORD.6

1 Scope.9
2 Normative references .9
3 Terms and definitions .10
3.1 General definitions .11
3.2 Definitions related to dielectric ratings.11
3.3 Definitions related to current ratings .13
3.4 Definitions related to accuracy .13
3.5 Definitions related to other ratings.14
3.6 Definitions related to gas insulation.14
3.7 Index of abbreviations .15
4 Normal and special service conditions .15
4.1 General .15
4.2 Normal service conditions .16
4.2.1 Ambient air temperature .16
4.2.2 Altitude.16
4.2.3 Vibrations or earth tremors .16
4.2.4 Other service conditions for indoor instrument transformers .16
4.2.5 Other service conditions for outdoor instrument transformers .17
4.3 Special service conditions .17
4.3.1 General .17
4.3.2 Altitude.17
4.3.3 Ambient temperature .17
4.3.4 Vibrations or earth tremors .17
4.3.5 Earthquakes .17
4.4 System earthing .18
5 Ratings.18
5.1 General .18
5.2 Highest voltage for equipment .18
5.3 Rated insulation levels .20
5.3.1 General .20
5.3.2 Rated primary terminal insulation level .20
5.3.3 Other requirements for primary terminals insulation.20
5.3.4 Between-section insulation requirements.21
5.3.5 Insulation requirements for secondary terminals .21
5.4 Rated frequency.21
5.5 Rated output .21
5.6 Rated accuracy class .21
6 Design and construction .21
6.1 Requirements for liquids used in equipment .21
6.1.1 General .21
6.1.2 Liquid quality .21
6.1.3 Liquid level device .21
6.1.4 Liquid tightness .21
6.2 Requirements for gases used in equipment .21

61869-1 © IEC:2007 – 3 –
6.2.1 General .21
6.2.2 Gas quality .22
6.2.3 Gas monitoring device .22
6.2.4 Gas tightness .22
6.2.5 Pressure relief device.23
6.3 Requirements for solid materials used in equipment .23
6.4 Requirements for temperature rise of parts and components .23
6.4.1 General .23
6.4.2 Influence of altitude on temperature-rise.24
6.5 Requirements for earthing of equipment .25
6.5.1 General .25
6.5.2 Earthing of the enclosure.25
6.5.3 Electrical continuity .25
6.6 Requirements for the external insulation.25
6.6.1 Pollution .25
6.6.2 Altitude.26
6.7 Mechanical requirements.27
6.8 Multiple chopped impulse on primary terminals .28
6.9 Internal arc fault protection requirements .28
6.10 Degrees of protection by enclosures.29
6.10.1 General .29
6.10.2 Protection of persons against access to hazardous parts and
protection of the equipment against ingress of solid foreign objects.29
6.10.3 Protection against ingress of water.29
6.10.4 Indoor instrument transformers.30
6.10.5 Outdoor instrument transformers .30
6.10.6 Protection of equipment against mechanical impact under normal
service conditions.30
6.11 Electromagnetic Compatibility (EMC) .30
6.11.1 General .30
6.11.2 Requirement for Radio Interference Voltage (RIV) .30
6.11.3 Requirements for immunity .31
6.11.4 Requirement for transmitted overvoltages.31
6.12 Corrosion .32
6.13 Markings .33
6.14 Fire hazard.33
7 Tests .33
7.1 General .33
7.1.1 Classification of tests .33
7.1.2 List of tests.34
7.1.3 Sequence of tests.35
7.2 Type tests .35
7.2.1 General .35
7.2.2 Temperature-rise test .36
7.2.3 Impulse voltage withstand test on primary terminals .37
7.2.4 Wet test for outdoor type transformers.38
7.2.5 Electromagnetic Compatibility (EMC) tests .38
7.2.6 Test for accuracy.40
7.2.7 Verification of the degree of protection by enclosures.40

– 4 – 61869-1 © IEC:2007
7.2.8 Enclosure tightness test at ambient temperature .41
7.2.9 Pressure test for the enclosure .41
7.3 Routine tests .41
7.3.1 Power-frequency voltage withstand tests on primary terminals .41
7.3.2 Partial discharge measurement .42
7.3.3 Power-frequency voltage withstand tests between sections .44
7.3.4 Power-frequency voltage withstand tests on secondary terminals .44
7.3.5 Test for accuracy.44
7.3.6 Verification of markings .44
7.3.7 Enclosure tightness test at ambient temperature .45
7.3.8 Pressure test for the enclosure .45
7.4 Special tests .45
7.4.1 Chopped impulse voltage withstand test on primary terminals .45
7.4.2 Multiple chopped impulse test on primary terminals .46
7.4.3 Measurement of capacitance and dielectric dissipation factor .47
7.4.4 Transmitted overvoltage test .47
7.4.5 Mechanical tests.49
7.4.6 Internal arc fault test.50
7.4.7 Enclosure tightness tests at low and high temperatures.51
7.4.8 Gas dew point test.52
7.4.9 Corrosion test.52
7.4.10 Fire hazard test .52
7.5 Sample tests .52
8 Rules for transport, storage, erection, operation and maintenance .53
9 Safety.53
10 Influence of products on the natural environment .53

Annex A (normative) Identification of test specimen .54
Annex B (informative) Rules for transport, storage, erection, operation and
maintenance .55
Annex C (informative) Fire hazard .60
Annex D (informative) Sample test.61

Bibliography.62

Figure 1 – Altitude correction factor for the temperature rise.25
Figure 2 – Altitude correction factor .27
Figure 3 – Transmitted overvoltages measurement: Test impulse waveforms.32
Figure 4 – RIV measuring circuit .39
Figure 5 – Test circuit for partial discharge measurement .42
Figure 6 – Alternative circuit for partial discharge measurement .42
Figure 7 – Example of balanced test circuit for partial discharge measurement.43
Figure 8 – Example of calibration circuit for partial discharge measurement.43
Figure 9 – Transmitted overvoltages measurement: general test configuration.48
Figure 10 – Transmitted overvoltages measurement: test circuit and GIS Test
configuration (CT).48

61869-1 © IEC:2007 – 5 –
Table 1 – Temperature categories .16
Table 2 – Rated primary terminal insulation levels for instrument transformers .19
Table 3 – Partial discharge test voltages and permissible levels .20
Table 4 – Permissible temporary leakage rates for gas systems .22
Table 5 – Limits of temperature rise for various parts, materials and dielectrics of
instrument transformers .24
Table 6 – Creepage distances .26
Table 7 – Static withstand test loads.28
Table 8 – Arc fault duration and performance criteria.29
Table 9 – Transmitted over voltage limits.31
Table 10 – List of tests .34
Table 11 – Gas type and pressure during type, routine and special tests .35
Table 12 – Modalities of application of the test loads to be applied to the line primary
terminals.50
Table C.1 – Fire hazard of electro technical products.60

– 6 – 61869-1 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 1: General requirements
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall be attached 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
essential 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 61869-1 has been prepared by IEC technical committee 38:
Instrument transformers.
TC 38 decided to restructure the whole set of stand-alone Standards in the IEC 60044 series
and transform it into a new set of standards composed of general requirements documents
and specific requirements documents.
This Standard is the first issue of this new series and can be regarded as a Product Family
standard. It contains the general requirements for instrument transformers and shall be read
in conjunction with the relevant specific requirements standard for the instrument transformer
concerned.
61869-1 © IEC:2007 – 7 –
An overview of the planned set of standards is given below:
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD STANDARD
STANDARD
61869-2 CURRENT 60044-1
TRANSFORMERS
61869-3 INDUCTIVE VOLTAGE 60044-2

TRANSFORMERS
61869-4 COMBINED 60044-3
TRANSFORMERS
61869-5 CAPACITIVE VOLTAGE 60044-5

TRANSFORMERS
61869-1
61869-6 CURRENT 60044-6
GENERAL
TRANSFORMERS FOR
REQUIREMENTS FOR
TRANSIENT
INSTRUMENT
PERFORMANCE
TRANSFORMERS
61869-9 61869-7 ELECTRONIC VOLTAGE 60044-7
TRANSFORMERS
ADDITIONAL
REQUIREMENTS AND 61869-8 ELECTRONIC
60044-8
DIGITAL INTERFACE
CURRENT
FOR ELECTRONIC
TRANSFORMERS
INSTRUMENT
TRANSFORMERS
61869-10 LOW-POWER STAND-
ALONE CURRENT
SENSORS
This Standard covers all general requirements formerly found in the stand-alone standards of
the IEC 60044 series. Additionally, it introduces some technical innovations:
• requirements for gas-insulated instrument transformers
• additional special tests
• requirements for internal arc fault protection
• requirements for degrees of protection by enclosure
• requirements for resistance to corrosion
• requirements for safety and environmental concerns
The text of this standard is based on the following documents:
FDIS Report on voting
38/360/FDIS 38/364/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.

– 8 – 61869-1 © IEC:2007
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
61869-1 © IEC:2007 – 9 –
INSTRUMENT TRANSFORMERS –
Part 1: General requirements
1 Scope
This International Standard is applicable to newly manufactured instrument transformers with
analogue or digital output for use with electrical measuring instruments or electrical protective
devices having rated frequencies from 15 Hz to 100 Hz.
This standard is a product family standard and covers general requirements only. For each
kind of instrument transformer the product standard is composed by this standard and the
relevant specific standard.
2 Normative references
The following referenced documents are essential for the application 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 60060-1: High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60068-2-11: Basic environmental testing procedures – Part 2: Tests – Test Ka: Salt mist
IEC 60068-2-17: Basic environmental testing procedures – Part 2: Tests - Test Q: Sealing
IEC 60068-2-75: Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests.
IEC 60071-1: Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60085: Electrical insulation – Thermal classification
IEC 60270: High-voltage test techniques – Partial discharge measurements
IEC 60296: Fluids for electrotechnical applications – Unused mineral insulating oils for
transformers and switchgear
IEC 60376: Specification of technical grade sulfur hexafluoride (SF ) for use in electrical
equipment
IEC 60417: Graphical symbols for use on equipment
IEC 60455 (all parts): Resin based reactive compounds used for electrical insulation
IEC 60480: Guidelines for the checking and treatment of sulphur hexafluoride (SF ) taken
from electrical equipment and specification for its re-use
IEC 60529: Degrees of protection provided by enclosures (IP code)
IEC 60567: Oil-filled electrical equipment – Sampling of gases and of oil for analysis of free
and dissolved gases – Guidance

– 10 – 61869-1 © IEC:2007
IEC 60694: Common specifications for high-voltage switchgear and controlgear standards
IEC 60695-1-1: Fire hazard testing – Part 1-1: Guidance for assessing the fire hazard of
electrotechnical products - General guidelines
IEC 60695-1-30: Fire hazard testing – Part 1-30: Guidance for assessing the fire hazard of
electrotechnical products – Use of preselection testing procedures
IEC 60695-7-1: Fire hazard testing – Part 7-1: Toxicity of fire effluent - General guidance
IEC 60721-3-3: Classification of environmental conditions – Part 3-3: Classification of groups
of environmental parameters and their severities – Stationary use of weatherprotected
locations
IEC 60721-3-4: Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 4: Stationary use at non-
weatherprotected locations
IEC 60815, Guide for the selection of insulators in respect of polluted conditions
IEC 60867: Insulating liquids – Specifications for unused liquids based on synthetic aromatic
hydrocarbons
IEC 61462: Composite hollow insulators – Pressurized and unpressurized insulators for use in
electrical equipment with rated voltage greater that 1 000 V – Definitions, test methods and
acceptance criteria and design recommendations
IEC 61634: High-voltage switchgear and controlgear – Use and handling of sulphur
hexafluoride (SF ) in high-voltage switchgear and controlgear
IEC 62155: Hollow pressurized and unpressurized ceramic and glass insulators for use in
electrical equipment with rated voltages greater than 1 000 V
IEC 62262: Degree of protection IK code
IEC 62271-2: High-voltage switchgear and controlgear – Part 2: Seismic qualification for rated
voltages of 72,5 kV and above.
IEC 62271-203: High-voltage switchgear and controlgear – Part 203: Gas-insulated metal-
enclosed switchgear for rated voltages above 52 kV
CISPR 18-2: Radio interference characteristics of overhead power lines and high-voltage
equipment – Part 2: Methods of measurement and procedure for determining limits
IEC Guide 109: Environmental aspects – Inclusion in electrotechnical product standards
ISO 3231: Paints and varnishes – Determination of resistance to humid atmospheres
containing sulphur dioxide
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

61869-1 © IEC:2007 – 11 –
3.1 General definitions
3.1.1
instrument transformer
transformer intended to transmit an information signal to measuring instruments, meters and
protective or control devices or similar apparatus
[IEV 321-01-01, modified]
3.1.2
enclosure
housing affording the type and degree of protection suitable for the intended application
[IEV 826-12-20]
3.1.3
primary terminals
terminals to which the voltage or current to be transformed is applied
3.1.4
secondary terminals
terminals which transmit an information signal to measuring instruments, meters and
protective or control devices or similar apparatus
3.1.5
secondary circuit
the external circuit receiving the information signals supplied by the secondary terminals of an
instrument transformer
[IEV 321-01-08, modified]
3.1.6
section
electrically conductive part of an instrument transformer insulated from other similar parts and
equipped with terminals
3.2 Definitions related to dielectric ratings
3.2.1
highest voltage of a system (Usys)
highest value of the phase-to-phase operating voltage (r.m.s. value) which occurs under
normal operating conditions at any time and at any point in the system
[IEV 601-01-23, modified]
3.2.2
highest voltage for equipment (U )
m
the highest r.m.s. value of phase-to-phase voltage for which the equipment is designed in
respect of its insulation as well as other characteristics which relate to this voltage in the
relevant equipment standards
[IEV 604-03-01 ]
3.2.3
rated insulation level
combination of voltage values which characterizes the insulation of a transformer with regard
to its capability to withstand dielectric stresses

– 12 – 61869-1 © IEC:2007
3.2.4
is
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