SIST EN IEC 60296:2020

SLOVENSKI STANDARD
SIST EN IEC 60296:2020
01-oktober-2020
Nadomešča:
SIST EN 60296:2012
Tekočine za elektrotehniko - Mineralna izolacijska olja za električno opremo
Fluids for electrotechnical applications - Mineral insulating oils for electrical equipment
Flüssigkeiten für elektrotechnische Anwendungen - Isolieröle auf Mineralölbasis für
elektrische Betriebsmittel
Fluides pour applications électrotechniques - Huiles minérales isolantes pour matériel
électrique
Ta slovenski standard je istoveten z: EN IEC 60296:2020
ICS:
29.040.10 Izolacijska olja Insulating oils
SIST EN IEC 60296:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60296:2020

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SIST EN IEC 60296:2020


EUROPEAN STANDARD EN IEC 60296

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2020
ICS 29.040.10 Supersedes EN 60296:2012 and all of its amendments
and corrigenda (if any)
English Version
Fluids for electrotechnical applications - Mineral insulating oils
for electrical equipment
(IEC 60296:2020)
Fluides pour applications électrotechniques - Huiles Flüssigkeiten für elektrotechnische Anwendungen -
minérales isolantes pour matériel électrique Isolieröle auf Mineralölbasis für elektrische Betriebsmittel
(IEC 60296:2020) (IEC 60296:2020)
This European Standard was approved by CENELEC on 2020-07-31. 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,
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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60296:2020 E

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SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
European foreword
The text of document 10/1117/FDIS, future edition 5 of IEC 60296, prepared by IEC/TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60296:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-01
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-07-31
document have to be withdrawn
This document supersedes EN 60296:2012 and all of its amendments and corrigenda (if any).
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 60296:2020 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 60076-2 NOTE Harmonized as EN 60076-2
IEC 60590 NOTE Harmonized as HD 382 S1
IEC 60867 NOTE Harmonized as EN 60867
ISO 2592 NOTE Harmonized as EN ISO 2592


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SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
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 60156 - Insulating liquids - Determination of the - -
breakdown voltage at power frequency - Test
method
IEC 60247 - Insulating liquids - Measurement of relative EN 60247 -
permittivity, dielectric dissipation factor (tan d)
and d.c. resistivity
IEC 60422 2013 Mineral insulating oils in electrical equipment - EN 60422 2013
Supervision and maintenance guidance
IEC 60475 - Method of sampling insulating liquids EN 60475 -
IEC 60567 2011 Oil-filled electrical equipment - Sampling of EN 60567 2011
gases and analysis of free and dissolved gases
- Guidance
IEC 60628 1985 Gassing of insulating liquids under electrical HD 488 S1 1987
stress and ionization
IEC 60666 2010 Detection and determination of specified EN 60666 2010
additives in mineral insulating oils
IEC 60814 - Insulating liquids - Oil-impregnated paper and EN 60814 -
pressboard - Determination of water by
automatic coulometric Karl Fischer titration
IEC 60970 - Insulating liquids - Methods for counting and EN 60970 -
sizing particles
IEC 61125 2018 Insulating liquids - Test methods for oxidation EN IEC 61125 2018
stability - Test method for evaluating the
oxidation stability of insulating liquids in the
delivered state
3

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SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
Publication Year Title EN/HD Year
IEC 61198 - Mineral insulating oils - Methods for the EN 61198 -
determination of 2-furfural and related
compounds
IEC 61619 - Insulating liquids - Contamination by EN 61619 -
polychlorinated biphenyls (PCBs) - Method of
determination by capillary column gas
chromatography
IEC 61620 - Insulating liquids - Determination of the EN 61620 -
dielectric dissipation factor by measurement of
the conductance and capacitance - Test method
IEC 61868 - Mineral insulating oils - Determination of EN 61868 -
kinematic viscosity at very low temperatures
IEC 62021-1 - Insulating liquids - Determination of acidity - EN 62021-1 -
Part 1: Automatic potentiometric titration
IEC 62021-2 - Insulating liquids - Determination of acidity - EN 62021-2 -
Part 2: Colourimetric titration
IEC 62535 2008 Insulating liquids - Test method for detection of EN 62535 2009
potentially corrosive sulphur in used and
unused insulating oil
IEC 62697-1 - Test methods for quantitative determination of EN 62697-1 -
corrosive sulfur compounds in unused and used
insulating liquids - Part 1: Test method for
quantitative determination of dibenzyldisulfide
(DBDS)
IEC 62961 - Insulating liquids - Test methods for the EN IEC 62961 -
determination of interfacial tension of insulating
liquids - Determination with the ring method
ISO 2049 - Petroleum products - Determination of colour - -
(ASTM scale)
ISO 2719 - Determination of flash point - Pensky-Martens EN ISO 2719 -
closed cup method
ISO 3016 - Petroleum and related products from natural or EN ISO 3016 -
synthetic sources - Determination of pour point
ISO 3104 - Petroleum products - Transparent and opaque EN ISO 3104 -
liquids - Determination of kinematic viscosity
and calculation of dynamic viscosity
ISO 3675 - Crude petroleum and liquid petroleum products EN ISO 3675 -
- Laboratory determination of density -
Hydrometer method
ISO 3819 - Laboratory glassware - Beakers EN ISO 3819 -
4

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SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
Publication Year Title EN/HD Year
ISO 8754 - Petroleum products - Determination of sulphur EN ISO 8754 -
content - Energy-dispersive X-ray fluorescence
spectrometry
ISO 12185 - Crude petroleum and petroleum products - EN ISO 12185 -
Determination of density - Oscillating U-tube
method
ISO 14596 - Petroleum products - Determination of sulphur EN ISO 14596 -
content - Wavelength-dispersive X-ray
fluorescence spectrometry
ASTM D 1500 - Standard Test Method for ASTM Color of - -
Petroleum Products (ASTM Color Scale)
ASTM D 6591 - Standard Test Method for Determination of - -
Aromatic Hydrocarbon Types in Middle
Distillates - High Performance Liquid
Chromatography Method with Refractive Index
Detection
ASTM D 7042 - Standard Test Method for Dynamic Viscosity - -
and Density of Liquids by Stabinger Viscometer
(and the Calculation of Kinematic Viscosity)
ASTM D 7896 - Standard Test Method for Thermal Conductivity, - -
Thermal Diffusivity and Volumetric Heat
Capacity of Engine Coolants and Related Fluids
by Transient Hot Wire Liquid Thermal
Conductivity Method
DIN 51353 - Testing of insulating oils; detection of corrosive - -
sulfur; silver strip test
IP 346 - Determination of polycyclic aromatics in - -
lubricant base oils and asphaltene free
petroleum fractions - Dimethylsulfoxide
refractive method



5

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IEC 60296

®


Edition 5.0 2020-06




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE
colour

inside










Fluids for electrotechnical applications – Mineral insulating oils for electrical

equipment



Fluides pour applications électrotechniques – Huiles minérales isolantes pour

matériel électrique

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.040.10 ISBN 978-2-8322-8377-6




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60296:2020
– 2 – IEC 60296:2020 © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Properties of oil . 12
4.1 General . 12
4.2 Functional properties . 12
4.3 Production and stability . 12
4.4 Performance . 13
4.5 Health, safety and environment (HSE) properties . 13
5 Classification, labelling, identification, general delivery requirements and sampling . 13
5.1 Classification and labelling . 13
5.1.1 Classes . 13
5.1.2 Antioxidant (oxidation inhibitor) content . 13
5.1.3 Lowest cold start energizing temperature (LCSET) . 14
5.1.4 Labelling and ordering designation . 14
5.2 Requirements . 14
5.3 Miscibility and compatibility . 14
5.4 Identification and general delivery requirements . 15
5.5 Sampling. 15
6 Properties, their significance and test methods . 15
6.1 Viscosity . 15
6.2 Pour point . 16
6.3 Water content . 16
6.4 Breakdown voltage . 16
6.5 Density . 16
6.6 Dielectric dissipation factor (DDF) . 17
6.7 Colour and appearance . 17
6.8 Acidity . 17
6.9 Interfacial tension (IFT) . 17
6.10 Sulphur content. 17
6.11 Corrosive and potentially corrosive sulphur . 17
6.12 Additives (see 3.3) . 18
6.12.1 General . 18
6.12.2 Antioxidants (see 3.4) . 18
6.12.3 Metal passivators. 18
6.12.4 Pour point depressants . 18
6.13 Oxidation stability . 19
6.14 Flash point . 19
6.15 Polycyclic aromatics (PCAs) and polyaromatic hydrocarbons (PAHs) . 19
6.16 Polychlorinated biphenyl content (PCBs). 19
6.17 2-furfural (2-FAL) and related compounds content . 19
6.18 DBDS content . 20
6.19 Stray gassing under thermo-oxidative stress . 20
7 Additional properties . 24

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SIST EN IEC 60296:2020
IEC 60296:2020 © IEC 2020 – 3 –
7.1 General . 24
7.2 Electrostatic charging tendency (ECT) . 24
7.3 Gassing tendency . 24
7.4 Thermal properties . 25
7.5 Properties connected with consistency (aromatic content, distribution of

PAHs, refractive index) . 25
7.6 Lubricating properties . 25
7.7 Particle content . 25
7.8 Foaming. 25
7.9 Transformer oil test equivalents . 25
Annex A (normative) Method for stray gassing under thermo-oxidative stress . 26
A.1 Overview of the method . 26
A.2 Required materials . 26
A.3 Pretreatment of syringes . 26
A.4 Procedure A: stray gassing under oxidative conditions (high oxygen content) . 27
A.4.1 Pretreatment of mineral oil . 27
A.4.2 Filling syringes with mineral oil . 27
A.4.3 Incubation procedure . 27
A.4.4 Dissolved gas analysis . 27
A.5 Procedure B: stray gassing under inert conditions (low oxygen content) . 27
A.6 Reporting . 28
A.6.1 Test report . 28
A.6.2 Evaluation of the stray gassing behaviour of the oil . 28
A.7 Precision data . 28
A.7.1 General . 28
A.7.2 Repeatability . 28
A.7.3 Reproducibility . 28
A.8 Results of the RRT. 29
A.8.1 General . 29
A.8.2 Stray gassing pattern 1 . 29
A.8.3 Stray gassing pattern 2 . 30
A.8.4 Stray gassing pattern 3 . 31
A.8.5 Stray gassing pattern 4 . 32
Annex B (informative) Potentially corrosive sulphur . 33
B.1 Mechanism of copper sulphide deposition . 33
B.2 Corrosive sulphur compounds in oil . 33
B.3 Detection of corrosive sulphur compounds in oils containing passivators . 33
B.3.1 General . 33
B.3.2 Procedure 1 . 34
B.3.3 Procedure 2 . 34
Annex C (informative) Contamination of oils with silicone. 35
Annex D (informative) Transformer oil test equivalents . 36
Bibliography . 38

Figure A.1 – Syringes with and without copper . 27
Figure A.2 – Stray gassing pattern 1 . 29
Figure A.3 – Stray gassing pattern 2 . 30
Figure A.4 – Stray gassing pattern 3 . 31

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Figure A.5 – Stray gassing pattern 4 . 32

Table 1 – Meaning of the identifying letter codes in the ordering designation of mineral
oil according to IEC 60296 . 14
Table 2 – Maximum viscosity and pour point of mineral insulating oil . 16
Table 3 – General specifications, Type A (fully inhibited high grade oils) . 21
Table 4 – General specifications, Type B (uninhibited and inhibited

standard grade oils) . 23
Table D.1 – Some transformer oil test equivalents . 36

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SIST EN IEC 60296:2020
IEC 60296:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
MINERAL INSULATING OILS FOR ELECTRICAL EQUIPMENT

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 60296 has been prepared by IEC technical committee 10: Fluids
for electrotechnical applications.
This fifth edition cancels and replaces the fourth edition published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– This International Standard is applicable to specifications and test methods for unused
and recycled mineral insulating oils in the delivered state.
– Within the transformer insulating oils, two groups, Type A and Type B, are defined, based
on their performance.
– A new method for stray gassing under thermo-oxidative stress of mineral insulating oils,
which has been tested in a joint round robin test (RRT) between CIGRE D1 and
IEC technical committee 10, has been included.

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SIST EN IEC 60296:2020
– 6 – IEC 60296:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
10/1117/FDIS 10/1118/RVD

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 committee has decided that the contents of this document 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 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.

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SIST EN IEC 60296:2020
IEC 60296:2020 © IEC 2020 – 7 –
INTRODUCTION
WARNING – This document does not purport to address all the safety problems associated
with its use. It is the responsibility of the user of this document to establish appropriate health
and safety practices and determine the applicability of regulatory limitations prior to use.
The mineral insulating oils which are the subject of this document should be handled in
compliance with local regulations and suppliers safety data-sheets.
This document is applicable to mineral insulating oils, chemicals and used sample containers.
The disposal of these items should be carried out according to local regulations with regard to
their impact on the environment.

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FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
MINERAL INSULATING OILS FOR ELECTRICAL EQUIPMENT



1 Scope
This document provides specifications and test methods for unused and recycled mineral
insulating oils (see Clause 3
...