SIST EN IEC 60422:2025
(Main)Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
IEC 60422:2024 provides monitoring guidance and procedures that are required for the use and maintenance of mineral insulating oils and other hydrocarbon-based liquids in transformers and other electrical equipment, including strategic spares and tanks for holding spare parts and components.
This document is applicable to mineral insulating oils, originally supplied conforming to IEC 60296, in transformers, switchgear and other electrical apparatus where oil sampling is reasonably practicable, and where the normal operating conditions specified in the equipment specifications apply.
This document is also intended to assist the power equipment operator to evaluate the condition of the oil and maintain it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice.
The document includes recommendations on tests and evaluation procedures, and outlines methods for reconditioning and reclaiming oil, and the decontamination of oil contaminated with PCBs.
NOTE The condition monitoring of electrical equipment, for example by analysis of dissolved gases, furanic compounds or other means, is outside the scope of this document.
Isolieröle auf Mineralölbasis in elektrischen Betriebsmitteln - Leitlinie zur Überwachung und Wartung
Huiles minérales isolantes dans les matériels électriques - Lignes directrices pour la maintenance et la surveillance
L'IEC 60422:2024 fournit des recommandations et des procédures de surveillance nécessaires pour l'utilisation et la maintenance des huiles minérales isolantes et d'autres liquides à base d'hydrocarbures dans les transformateurs et autres matériels électriques, y compris les pièces de rechange stratégiques et les cuves qui contiennent les pièces et composants de rechange.
Le présent document s'applique aux huiles minérales isolantes qui satisfont à l'origine aux exigences de l'IEC 60296 et sont présentes dans les transformateurs, appareillages de connexion et autres appareils électriques pour lesquels le prélèvement d'échantillons d'huile est raisonnablement possible et auxquels les conditions normales de fonctionnement prévues dans les spécifications du matériel s'appliquent.
Le présent document est également destiné à aider l'opérateur du matériel électrique à évaluer l'état de l'huile et à la maintenir en état d'être utilisée. Il fournit également une base commune à l'élaboration de codes de pratique locaux plus complets et plus spécifiques.
Le document inclut des recommandations sur les essais et les procédures d'évaluation et indique des procédés de retraitement et de régénération de l'huile ainsi que de décontamination de l'huile contaminée par les PCB.
NOTE La surveillance de l'état des matériels électriques, par exemple par l'analyse des gaz dissous et des dérivés furaniques, ou par tout autre moyen, ne fait pas partie du domaine d'application du présent document.
Mineralna izolacijska olja v električni opremi - Napotki za nadzorovanje in vzdrževanje
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2025
Mineralna izolacijska olja v električni opremi - Napotki za nadzorovanje in
vzdrževanje
Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
Isolieröle auf Mineralölbasis in elektrischen Betriebsmitteln - Leitlinie zur Überwachung
und Wartung
Huiles minérales isolantes dans les matériels électriques - Lignes directrices pour la
maintenance et la surveillance
Ta slovenski standard je istoveten z: EN IEC 60422:2024
ICS:
29.040.10 Izolacijska olja Insulating oils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60422
NORME EUROPÉENNE
EUROPÄISCHE NORM August 2024
ICS 29.040.10 Supersedes EN 60422:2013
English Version
Mineral insulating oils in electrical equipment - Supervision and
maintenance guidance
(IEC 60422:2024)
Huiles minérales isolantes dans les matériels électriques - Isolieröle auf Mineralölbasis in elektrischen Betriebsmitteln -
Lignes directrices pour la maintenance et la surveillance Leitlinie zur Überwachung und Wartung
(IEC 60422:2024) (IEC 60422:2024)
This European Standard was approved by CENELEC on 2024-08-22. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60422:2024 E
European foreword
The text of document 10/1233/FDIS, future edition 5 of IEC 60422, prepared by TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60422:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-05-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-08-22
document have to be withdrawn
This document supersedes EN 60422:2013 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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60422:2024 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60567 NOTE Approved as EN IEC 60567
IEC 60599 NOTE Approved as EN IEC 60599
IEC 61198 NOTE Approved as EN 61198
IEC 61620 NOTE Approved as EN 61620
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60156 - Insulating liquids - Determination of the EN 60156 -
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 60296 2020 Fluids for electrotechnical applications - EN IEC 60296 2020
Mineral insulating oils for electrical
equipment
IEC 60475 - Method of sampling insulating liquids EN IEC 60475 -
IEC 60666 2010 Detection and determination of specified EN 60666 2010
additives in mineral insulating oils
IEC 60814 - Insulating liquids - Oil-impregnated paper EN 60814 -
and pressboard - Determination of water
by automatic coulometric Karl Fischer
titration
IEC 60970 - Insulating liquids - Methods for counting EN 60970 -
and sizing particles
IEC 61125 2018 Insulating liquids - Test methods for EN IEC 61125 2018
oxidation stability - Test method for
evaluating the oxidation stability of
insulating liquids in the delivered state
IEC 61619 - Insulating liquids - Contamination by EN 61619 -
polychlorinated biphenyls (PCBs) - Method
of determination by capillary column gas
chromatography
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
Publication Year Title EN/HD Year
IEC 62535 2008 Insulating liquids - Test method for EN 62535 2009
detection of potentially corrosive sulphur in
used and unused insulating oil
IEC 62697-1 - Test methods for quantitative EN 62697-1 -
determination of 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- EN ISO 2719 -
Martens closed cup method
ISO 3016 - Petroleum and related products from EN ISO 3016 -
natural or synthetic sources -
Determination of pour point
ISO 3104 - Petroleum products – Transparent and EN ISO 3104 -
opaque liquids – Determination of
kinematic viscosity and calculation of
dynamic viscosity
ISO 3675 - Crude petroleum and liquid petroleum EN ISO 3675 -
products - Laboratory determination of
density - Hydrometer method
ISO 6247 - Petroleum products - Determination of - -
foaming characteristics of lubricating oils
ISO 9120 - Petroleum and related products - - -
Determination of air-release properties of
steam turbine and other oils - Impinger
method
ISO 12185 - Crude petroleum and petroleum products - EN ISO 12185 -
Determination of density - Oscillating U-
tube method
ASTM D7042 - Standard Test Method for Dynamic - -
Viscosity and Density of Liquids by
Stabinger Viscometer (and the Calculation
of Kinematic Viscosity)
ASTM D971 - Standard Test Method for Interfacial - -
Tension of Oil Against Water by the Ring
Method
DIN 51353 - Testing of insulating oils; detection of - -
corrosive sulfur; silver strip test
IEC 60422 ®
Edition 5.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mineral insulating oils in electrical equipment – Supervision and maintenance
guidance
Huiles minérales isolantes dans les matériels électriques – Lignes directrices
pour la maintenance et la surveillance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10 ISBN 978-2-8322-9202-0
– 2 – IEC 60422:2024 © IEC 2024
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 Properties and deterioration or degradation of oil . 12
5 Categories of equipment . 12
6 Sampling of oil from equipment. 13
7 In-service oil diagnostic tests . 14
7.1 General . 14
7.2 Colour . 15
7.3 Appearance . 15
7.4 Breakdown voltage (BDV) . 15
7.5 Water content . 16
7.5.1 Water content in the oil and paper system . 16
7.5.2 Influence of water on the solid and liquid dielectric system . 16
7.5.3 Water in oil . 17
7.5.4 Water in the solid insulation . 18
7.5.5 Interpretation of results . 19
7.6 Acidity . 20
7.7 Dielectric dissipation factor (DDF) and resistivity . 21
7.8 Inhibitor content . 22
7.8.1 Oxidation stability . 22
7.8.2 Monitoring of uninhibited and inhibited oils . 22
7.9 Sediment . 22
7.10 Sludge . 23
7.11 Interfacial tension (IFT) . 23
7.12 Particles . 23
7.13 Flash point . 24
7.14 Compatibility . 24
7.14.1 General . 24
7.14.2 Compatibility between different insulating mineral oils (miscibility) . 24
7.15 Pour point . 25
7.16 Density . 25
7.17 Viscosity . 26
7.18 Polychlorinated biphenyls (PCBs) . 26
7.19 Corrosive sulphur in mineral insulating oil . 26
7.19.1 General . 26
7.19.2 Corrosive sulphur . 27
7.19.3 Potentially corrosive sulphur . 27
7.19.4 Dibenzyl disulphide (DBDS) . 27
7.20 Metal passivator. 28
7.21 Air release and
...
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