IEC 63012:2019 

Insulating liquids - Unused modified or blended esters for electrotechnical applications


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IEC 60312:2019 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.

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Additional information

Publication typeInternational Standard
Publication date2019-05-09
Available language(s)English/French
TC/SCTC 10 - Fluids for electrotechnical applicationsrss
ICS29.040.10 - Insulating oils
Stability date  2024
File size1311 KB

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