Fluids for electrotechnical applications - Mineral insulating oils for electrical equipment

IEC 60296:2020 provides specifications and test methods for unused and recycled mineral insulating oils. It applies to mineral oil delivered according to the contractual agreement, intended for use in transformers, switchgear and similar electrical equipment in which oil is required for insulation and heat transfer. Both unused oil and recycled oil under the scope of this document have not been used in, nor been in contact with electrical equipment or other equipment not required for manufacture, storage or transport. Unused oils are obtained by refining, modifying and/or blending of petroleum products and other hydrocarbons from virgin feedstock. Recycled oils are produced from oils previously used as mineral insulating oils in electrical equipment that have been subjected to re-refining or reclaiming (regeneration) by processes employed offsite. Such oils will have originally been supplied in compliance with a recognized unused mineral insulating oil specification. This document does not differentiate between the methods used to recycle mineral insulating oil. Oils treated on-site (see IEC 60422) are not within the scope of this document. Oils with and without additives are both within the scope of this document. This document does not apply to mineral insulating oils used as impregnating medium in cables or capacitors. 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.

Flüssigkeiten für elektrotechnische Anwendungen - Isolieröle auf Mineralölbasis für elektrische Betriebsmittel

Fluides pour applications électrotechniques - Huiles minérales isolantes pour matériel électrique

L'IEC 60296:2020 énonce les spécifications et méthodes d'essai pour les huiles minérales isolantes neuves et recyclées (voir l'Article 3 pour les définitions). Il s'applique à l'huile minérale livrée dans le cadre d’un accord contractuel, destinée à être utilisée dans les transformateurs, appareillages de connexion et matériels électriques analogues, dans lesquels l'huile est exigée comme fluide isolant et caloporteur. Une huile neuve ou recyclée relevant du domaine d’application du présent document n’a été ni utilisée dans des matériels électriques ni mise à leur contact ou au contact de tout autre matériel non exigé à sa fabrication, son stockage ou son transport. Les huiles neuves sont obtenues par raffinage, modification et/ou mélange de produits pétroliers et d’autres hydrocarbures issus de matières premières vierges. Les huiles recyclées sont produites à partir d'huiles précédemment utilisées comme huiles minérales isolantes dans les matériels électriques et qui ont été soumises à un reraffinage ou à une régénération selon des procédés appliqués hors site. À l'origine, ces huiles ont été fournies conformément à une spécification reconnue relative aux huiles minérales isolantes neuves. Le présent document ne fait pas de distinction entre les méthodes utilisées pour recycler les huiles minérales isolantes. Les huiles traitées sur site (voir l'IEC 60422) ne relèvent pas du domaine d'application du présent document. Le présent document s'applique aux huiles avec ou sans additifs. Le présent document ne concerne pas les huiles minérales isolantes utilisées comme imprégnant dans des câbles ou des condensateurs.

Tekočine za elektrotehniko - Mineralna izolacijska olja za električno opremo

General Information

Publication Date
Current Stage
6060 - Document made available - Publishing
Start Date
Completion Date


Buy Standard

EN IEC 60296:2020 - BARVE
English language
45 pages
sale 10% off
sale 10% off
e-Library read for
1 day

Standards Content (Sample)

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
Ta slovenski standard je istoveten z: EN IEC 60296:2020
29.040.10 Izolacijska olja Insulating oils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.


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
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
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

Annex ZA
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)
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:
Publication Year Title EN/HD Year
IEC 60156 - Insulating liquids - Determination of the - -
breakdown voltage at power frequency - Test
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
Publication Year Title EN/HD Year
IEC 61198 - Mineral insulating oils - Methods for the EN 61198 -
determination of 2-furfural and related
IEC 61619 - Insulating liquids - Contamination by EN 61619 -
polychlorinated biphenyls (PCBs) - Method of
determination by capillary column gas
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
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 -
Publication Year Title EN/HD Year
ISO 8754 - Petroleum products - Determination of sulphur EN ISO 8754 -
content - Energy-dispersive X-ray fluorescence
ISO 12185 - Crude petroleum and petroleum products - EN ISO 12185 -
Determination of density - Oscillating U-tube
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
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
IEC 60296 ®
Edition 5.0 2020-06
Fluids for electrotechnical applications – Mineral insulating oils for electrical

Fluides pour applications électrotechniques – Huiles minérales isolantes pour

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

– 2 – IEC 60296:2020 © IEC 2020
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

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.