IEC 62770:2013

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.

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.

General Information

• Status: Published
• Publication Date: 18-Nov-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.040.01 - Insulating fluids in general
• Technical Committee: TC 10 - Fluids for electrotechnical applications

Relations

• Revised: IEC 62770:2024 - Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62770 ®
Edition 1.0 2013-11
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

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IEC 62770 ®
Edition 1.0 2013-11
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
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 29.040 ISBN 978-2-8322-1191-5

– 2 – 62770  IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
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
Table A.1 – Relative repeatability and relative reproducibility obtained for different
parameters during RRT . 15
Table B.1 – Specifications for low-viscosity of monoesters derived from natural esters . 16

– 4 – 62770  IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
UNUSED NATURAL ESTERS FOR TRANSFORMERS
AND SIMILAR ELECTRICAL EQUIPMENT

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