IEC 63012:2019

Insulating liquids - Unused modified or blended esters for electrotechnical applications

IEC 63012:2019 defines requirements for the characterization of unused modified esters or blends of unused esters used as insulating liquids for electrotechnical applications. It does not cover liquids that contain any proportion of used liquids. The liquids covered by this document are intended mainly for transformer applications.
Unused modified/synthetized esters are derived from a natural or synthetic base, or are blends of both. This document covers a variety of ester liquids not covered by other standards specific to natural esters (IEC 62770) or synthetic esters (IEC 61099). As it addresses various categories of liquids, this document also covers a wide range of values for certain performance characteristics. An important property is viscosity, which can affect the design and cooling performance of electrical equipment. A categorization is defined based on the kinematic viscosity of the different liquids. The category of low viscosity ester liquids is established.

Isolants liquides - Esters neufs modifiés ou mélangés pour applications électrotechniques

L'IEC 63012:2019 définit les exigences relatives à la caractérisation des esters neufs modifiés ou des mélanges d'esters neufs, utilisés comme isolants liquides pour des applications électrotechniques. Il ne couvre pas les liquides contenant une proportion quelconque de liquides usagés. Les liquides couverts par le présent document sont principalement destinés aux applications dans des transformateurs. Les esters neufs synthétiques/modifiés sont dérivés d'une base naturelle ou synthétique, ou sont des mélanges des deux. Le présent document couvre une variété de liquides à base d'esters non couverts par d'autres normes spécifiques aux esters naturels (IEC 62770) ou aux esters synthétiques (IEC 61099). Traitant d'une grande variété de liquides, le présent document couvre également une large plage de valeurs pour certaines caractéristiques de performance. La viscosité est une propriété importante qui peut influencer la conception et les performances de refroidissement du matériel électrique. Une classification est définie sur la base de la viscosité cinématique des différents liquides. La catégorie des liquides à base d'esters à faible viscosité est donc établie.

General Information

• Status: Published
• Publication Date: 08-May-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.040.10 - Insulating oils
• Technical Committee: TC 10 - Fluids for electrotechnical applications
• Drafting Committee: PT 63012 - TC 10/PT 63012
• Current Stage: PPUB - Publication issued
• Start Date: 31-May-2019
• Completion Date: 09-May-2019

Standards Content (Sample)

IEC 63012 ®
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating liquids – Unused modified or blended esters for electrotechnical
applications
Isolants liquides – Esters neufs modifiés ou mélangés pour applications
électrotechniques
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IEC 63012 ®
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating liquids – Unused modified or blended esters for electrotechnical

applications
Isolants liquides – Esters neufs modifiés ou mélangés pour applications

électrotechniques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10 ISBN 978-2-8322-6894-0

– 2 – IEC 63012:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Classification . 10
4.1 General . 10
4.2 Fire performance classification . 10
4.3 Viscosity classification . 10
5 Properties, significance and test methods . 10
5.1 Physical properties . 10
5.1.1 Appearance . 10
5.1.2 Colour . 11
5.1.3 Viscosity . 11
5.1.4 Lubricity . 11
5.1.5 Thermal conductivity . 11
5.1.6 Thermal expansion coefficient . 11
5.1.7 Specific heat capacity . 11
5.1.8 Pour point . 11
5.1.9 Water content . 12
5.1.10 Water saturation . 12
5.1.11 Density . 12
5.1.12 Interfacial tension . 12
5.2 Electrical properties . 12
5.2.1 AC breakdown voltage . 12
5.2.2 Lightning impulse breakdown voltage . 12
5.2.3 Partial discharge inception voltage (PDIV) . 13
5.2.4 Dielectric dissipation factor (DDF) . 13
5.2.5 Relative permittivity (dielectric constant) . 13
5.2.6 DC resistivity . 13
5.2.7 Electrostatic charging tendency (ECT) . 13
5.3 Chemical properties . 13
5.3.1 Acidity . 13
5.3.2 Additive content . 13
5.3.3 Corrosive and potentially corrosive sulphur compounds . 13
5.3.4 Methanol content . 14
5.4 Properties related to long term performance . 14
5.4.1 Oxidation stability . 14
5.4.2 Operating temperature . 14
5.4.3 Material compatibility . 15
5.4.4 Stray gassing . 15
5.4.5 Gassing tendency . 15
5.5 Health, safety and environmental properties . 15
5.5.1 General . 15
5.5.2 Polychlorinated biphenyls (PCBs) . 15
5.5.3 Environmental toxicity . 15

5.5.4 Flash point and fire point . 15
5.5.5 Sustainability . 16
5.5.6 Biodegradation . 16
5.5.7 Disposal . 16
6 Minimum performance requirements . 16
7 Identification and general delivery requirements . 16
Annex A (informative) Miscibility and compatibility of liquids and retrofilling of

transformers . 19
Bibliography . 20

Table 1 – Required performance characteristics of modified or blended esters . 17
Table 2 – Optional performance characteristics of modified or blended esters . 18

– 4 – IEC 63012:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATING LIQUIDS – UNUSED MODIFIED OR BLENDED ESTERS
FOR ELECTROTECHNICAL APPLICATIONS

FOREWORD
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