Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment

IEC 62770:2013 describes specifications and test methods for unused natural esters in transformers and similar oil-impregnated electrical equipment in which a liquid is required as an insulating and heat transfer medium. Natural esters with additives are within the scope of this standard. Because of their different chemical composition, natural esters differ from insulating mineral oils and other insulating fluids that have high fire points, such as synthetic esters or silicone fluids. Natural, ester-derived insulating fluids with low viscosity have been introduced but are not covered by this standard. Pertinent properties of such fluids are given in Annex B. This standard is applicable only to unused natural esters. Reclaimed natural esters and natural esters blended with non-natural esters fluids are beyond the scope of this standard.

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

La CEI 62770:2013 décrit les spécifications et méthodes d'essai applicables aux esters naturels neufs dans les transformateurs et matériels électriques imprégnés d'huile analogues nécessitant un liquide en tant que milieu isolant et caloporteur. Les esters naturels avec additifs entrent dans le domaine d'application de la présente norme. En raison de leur composition chimique différente, les esters naturels se distinguent des huiles minérales isolantes et d'autres fluides isolants qui possèdent des points de feu élevés, tels que les esters synthétiques ou les fluides silicones. Les fluides isolants dérivés d'esters naturels présentant une faible viscosité ont été introduits, mais ne sont pas couverts par la présente norme. Les propriétés pertinentes de ces fluides sont indiquées dans l'Annexe B. La présente norme n'est applicable qu'aux esters naturels neufs. Les esters naturels régénérés et les esters naturels mélangés à des fluides à base d'esters non naturels n'entrent pas dans le domaine d'application de cette norme.

Tekočine za elektrotehniko - Neuporabljene naravne estrske tekočine za transformatorje in podobno električno opremo (IEC 62770:2013)

EN IEC 62770 opisuje specifikacije in preskusne metode za neuporabljene naravne estrske tekočine za transformatorje in podobno oljno impregnirano električno opremo, kjer je tekočina potrebna kot sredstvo za izolacijo in prenos toplote. Uporaba naravnih estrov ni priporočena za električno opremo, ki je izpostavljena atmosferskim vplivom. V tem standardu se izraz „naravni estri“ nanaša na izolacijske tekočine za transformatorje in podobno elektronsko opremo ustrezne biorazgradljivosti in okoljske združljivosti. Takšni naravni estri so rastlinska olja, pridobljena iz semen, in olja, pridobljena iz drugih primernih bioloških materialov, ter dovedena do določene točke v določenem času. Ta olja so sestavljena iz trigliceridov. Ta standard zajema naravne estre z dodatki. Naravni estri se zaradi drugačne kemične sestave razlikujejo od izolacijskih mineralnih olj in drugih izolacijskih tekočin, ki imajo visoka gorišča, kot so sintetični estri ali silikonske tekočine. Naravne nizkoviskozne izolacijske tekočine iz estrov so predstavljene, vendar jih ta standard ne zajema. Zadevne lastnosti takšnih tekočin so podane v Dodatku B. Ta standard zajema samo neuporabljene naravne estre. Ponovno uporabljeni naravni estri in naravni estri, zmešani z nenaravnimi estrskimi tekočinami, niso vključeni v obseg tega standarda. Kemijska nomenklatura in znanstvene oznake, uporabljene v tem standardu, so skladne s priročnikom Mednarodne zveze za čisto in uporabno kemijo (IUPAC) o količinah, enotah in simbolih v fizikalni kemiji.

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Fluids for electrotechnical applications - Unused natural esters liquids for transformers
and similar electrical equipment
Fluides pour applications électrotechniques - Esters naturels neufs pour transformateurs
et matériels électriques analogues
Ta slovenski standard je istoveten z: EN 62770:2014
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.

EN 62770
April 2014
ICS 29.040
English version
Fluids for electrotechnical applications -
Unused natural esters for transformers and similar electrical equipment
(IEC 62770:2013)
Fluides pour applications Flüssigkeiten für elektrotechnische
électrotechniques - Anwendungen -
Esters naturels neufs pour Neue natürliche Ester für Transformatoren
transformateurs et matériels électriques und ähnliche elektrische Betriebsmittel
analogues (IEC 62770:2013)
(CEI 62770:2013)
This European Standard was approved by CENELEC on 2013-12-24. 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, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, 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: Avenue Marnix 17, B - 1000 Brussels

© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62770:2014 E
The text of document 10/909/FDIS, future edition 1 of IEC 62770, prepared by IEC TC 10 "Fluids for
electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62770:2014.
The following dates are fixed:

• latest date by which the document has (dop) 2014-10-18
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-12-24
• latest date by which the national
standards conflicting with the

document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
Endorsement notice
The text of the International Standard IEC 62770:2013 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 60422 NOTE Harmonised as EN 60422.
IEC 61039 NOTE Harmonised as EN 61039.
IEC 61099 NOTE Harmonised as EN 61099.
IEC 61868 NOTE Harmonised as EN 61868.

- 3 - EN 62770:2014
Annex ZA
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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
Publication Year Title EN/HD Year

IEC 60076-14 - Power transformers - EN 60076-14 -
Part 14: Liquid-immersed power transformers
using high-temperature insulation materials

IEC 60156 - Insulating liquids - Determination of the EN 60156 -
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 60296 - Fluids for electrotechnical applications - EN 60296 -
Unused mineral insulating oils for
transformers and switchgear
IEC 60475 - Method of sampling insulating liquids EN 60475 -

IEC 60666 - Detection and determination of specified EN 60666 -
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 61100 - Classification of insulating liquids according to EN 61100 -
fire point and net calorific value

IEC 61125 1992 Unused hydrocarbon based insulating liquids - EN 61125 1993
Test methods for evaluating the oxidation
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
Withdrawn in 2009 and partially replaced by IEC 61039.

IEC 62021-3 - Insulating liquids - Determination of acidity - EN 62021-3 -
Part 3: Test methods for non mineral
insulating oils
IEC 62535 2008 Insulating liquids - Test method for detection EN 62535 2009
of potentially corrosive sulphur in used and
unused insulating oil
IEC 62697-1 - Test method 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)

ISO 2592 - Determination of flash and fire points - - -
Cleveland open cup method
ISO 2719 - Determination of flash point - Pensky-Martens - -
closed cup method
ISO 3016 - Petroleum products - Determination of pour - -
ISO 3104 - Petroleum products - Transparent and opaque - -
liquids - Determination of kinematic viscosity
and calculation of dynamic viscosity

ISO 3675 - Crude petroleum and liquid petroleum - -
products - Laboratory determination of density
- Hydrometermethod
ISO 12185 - Crude petrolelum and petroleum products - - -
Determination of density - Oscillating U-tube
ASTM D 1275 - Standard Test Method for Corrosive Sulfur in - -
Electrical Insulating Oils
OECD 201-203 - Test Guidelines for ecotoxicity - -

OECD 301 Guideline for testing of chemicals adopted by - -
European Council
US EPA - Office of Prevention, Pesticides and Toxic - -
Substances (OPPTS)
835.311 - Fate, Transport and Transformation Test - -
IEC 62770 ®
Edition 1.0 2013-11
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

ICS 29.040 ISBN 978-2-8322-1191-5

– 2 – 62770  IEC:2013
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Properties, their significance and test methods . 9
4.1 General . 9
4.2 Physical properties . 9
4.2.1 Appearance . 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 . 10
4.3.1 Breakdown voltage . 10
4.3.2 Dielectric dissipation factor (DDF) . 10
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 . 11
4.5 Performance . 11
4.5.1 Oxidation stability . 11
4.5.2 Total acidity . 12
4.5.3 Viscosity . 12
4.5.4 Dielectric dissipation factor (DDF) . 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 . 12
4.6.4 Toxicity . 12
5 Classification, identification, general delivery requirements and sampling . 12
5.1 Classification . 12
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 Introductory remark . 15
A.2 Test conditions . 15
A.3 Precision . 15
A.4 Relative repeatability (r) . 15
A.5 Relative reproducibility (R) . 15
Annex B (informative) Specifications of low-viscosity insulating fluids derived from
natural esters . 16
Bibliography . 17

62770  IEC:2013 – 3 –
Table 1 – General specifications . 14

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