SIST EN IEC 62770:2025
(Main)Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
IEC 62770:2024 describes specifications and test methods for unused natural esters in transformers and similar liquid-immersed electrical equipment in which a liquid is required as an insulating and heat transfer medium. The exposure of natural ester to air leads to deterioration of the insulating liquid. Use of natural esters is therefore restricted to sealed units, or with the conservator tank protected from the contact with atmosphere by a membrane or other suitable system.
Flüssigkeiten für elektrotechnische Anwendungen - Neue natürliche Ester für Transformatoren und ähnliche elektrische Betriebsmittel
Fluides pour applications électrotechniques - Esters naturels neufs pour transformateurs et matériels électriques analogues
IEC 62770:2024 décrit les spécifications et méthodes d'essai applicables aux esters naturels neufs dans les transformateurs et matériels électriques immergés dans du liquide analogues qui nécessitent un liquide en tant que milieu isolant et caloporteur. L'exposition de l'ester naturel à l'air entraîne une détérioration du liquide isolant. L'utilisation des esters naturels est donc limitée à des unités scellées, ou avec le conservateur protégé du contact atmosphérique par une membrane ou tout autre système approprié.
Tekočine za elektrotehniko - Neuporabljeni naravni estri za transformatorje in podobno električno opremo
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2025
Tekočine za elektrotehniko - Neuporabljeni naravni estri za transformatorje in
podobno električno opremo
Fluids for electrotechnical applications - Unused natural esters for transformers and
similar electrical equipment
Flüssigkeiten für elektrotechnische Anwendungen - Neue natürliche Ester für
Transformatoren und ähnliche elektrische Betriebsmittel
Fluides pour applications électrotechniques - Esters naturels neufs pour transformateurs
et matériels électriques analogues
Ta slovenski standard je istoveten z: EN IEC 62770:2024
ICS:
29.040.01 Izolacijski fluidi na splošno Insulating fluids in general
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62770
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2024
ICS 29.040.01 Supersedes EN 62770:2014
English Version
Fluids for electrotechnical applications - Unused natural esters
for transformers and similar electrical equipment
(IEC 62770:2024)
Fluides pour applications électrotechniques - Esters Flüssigkeiten für elektrotechnische Anwendungen - Neue
naturels neufs pour transformateurs et matériels électriques natürliche Ester für Transformatoren und ähnliche
analogues elektrische Betriebsmittel
(IEC 62770:2024) (IEC 62770:2024)
This European Standard was approved by CENELEC on 2024-11-12. 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 62770:2024 E
European foreword
The text of document 10/1215/FDIS, future edition 2 of IEC 62770, prepared by TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62770:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-11-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-11-30
document have to be withdrawn
This document supersedes EN 62770:2014 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 62770:2024 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 60076-14 NOTE Approved as EN 60076-14
IEC 60296 NOTE Approved as EN IEC 60296
IEC 60422 NOTE Approved as EN IEC 60422
IEC 61039 NOTE Approved as EN 61039
IEC 61099 NOTE Approved as EN 61099
IEC 61868 NOTE Approved as EN 61868
IEC 63012 NOTE Approved as EN IEC 63012
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 IEC 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 60475 - Method of sampling insulating liquids EN IEC 60475 -
IEC 60666 - Detection and determination of specified EN 60666 -
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 61125 - Insulating liquids - Test methods for EN IEC 61125 -
oxidation stability - Test method for
evaluating the oxidation stability of
insulating liquids in the delivered state
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 62021-3 - Insulating liquids - Determination of acidity EN 62021-3 -
- Part 3: Test methods for non-mineral
insulating oils
IEC 62535 - Insulating liquids - Test method for EN 62535 -
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)
ISO 2049 - Petroleum products - Determination of - -
colour (ASTM scale)
ISO 2592 - Petroleum and related products - EN ISO 2592 -
Determination of flash and fire points -
Cleveland open 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 fluids - 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 12185 - Crude petroleum and petroleum products - EN ISO 12185 -
Determination of density - Oscillating U-
tube method
ASTM D1500 - Standard Test Method for ASTM Color of - -
Petroleum Products (ASTM Colour Scale)
ASTM D7042 - Standard Test Method for Dynamic - -
Viscosity and Density of Liquids by
Stabinger Viscometer (and the Calculation
of Kinematic Viscosity)
IEC 62770 ®
Edition 2.0 2024-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fluids for electrotechnical applications – Unused natural esters for
transformers and similar electrical equipment
Fluides pour applications électrotechniques – Esters naturels neufs pour
transformateurs et matériels électriques analogues
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.01 ISBN 978-2-8322-9528-1
– 2 – IEC 62770:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 9
4 Properties, their significance and test methods . 9
4.1 General . 9
4.2 Physical properties . 9
4.2.1 Appearance and colour . 9
4.2.2 Viscosity . 10
4.2.3 Pour point . 10
4.2.4 Water content . 10
4.2.5 Density . 10
4.3 Electrical properties . 11
4.3.1 Breakdown voltage . 11
4.3.2 Dielectric dissipation factor (DDF) . 11
4.3.3 Relative permittivity (dielectric constant) . 11
4.4 Chemical properties . 11
4.4.1 Acidity . 11
4.4.2 Corrosive sulfur . 11
4.4.3 Additive content . 11
4.4.4 Furfural content . 12
4.5 Performance . 12
4.5.1 General . 12
4.5.2 Oxidation stability . 12
4.6 Health, safety and environmental (HSE) properties . 12
4.6.1 Fire point and flash point . 12
4.6.2 Polychlorinated biphenyls (PCBs) . 12
4.6.3 Biodegradation . 13
4.6.4 Aquatic toxicity . 13
5 Classification, identification, general delivery requirements, and sampling . 13
5.1 Classification . 13
5.2 Identification and general delivery requirements . 13
5.3 Sampling. 13
Annex A (normative) Summary of the test method for evaluating oxidation stability
of unused natural esters . 15
A.1 General . 15
A.2 Test conditions . 15
A.3 Precision . 15
A.4 Relative repeatability (r) . 15
A.5 Relative reproducibility (R) . 15
Bibliography . 16
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