IEC 63012:2019 pdf download

IEC 63012:2019 pdf download.Insulating liquids – Unused modified or blended esters for electrotechnical applications
1 Scope
This document 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 61 099). 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.
2 Normative references
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. IEC 601 56, Insulating liquids – Determination of the breakdown voltage at power frequency – Test method IEC 60247, Insulating liquids – Measurement of relative permittivity, dielectric dissipation factor (tan δ ) and d.c. resistivity IEC 60666, Detection and determination of specified additives in mineral insulating oils IEC 60628, Gassing of insulating liquids under electrical stress and ionization IEC 6081 4, Insulating liquids – Oil-impregnated paper and pressboard – Determination of water by automatic coulometric Karl Fischer titration IEC 60897, Methods for the determination of the lightning impulse breakdown voltage of insulating liquids IEC 61 099:201 0, Insulating liquids – Specifications for unused synthetic organic esters for electrical purposes IEC 61 1 25, Insulating liquids – Test methods for oxidation stability – Test method for evaluating the oxidation stability of insulating liquids in the delivered state IEC TR 61 294, Insulating liquids – Determination of the partial discharge inception voltage (PDIV) – Test procedure
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at https://www.iso.org/obp/ui 3.1 unused insulating liquid liquid as delivered by the supplier which has not been used in, or been in contact with electrical equipment or other equipment not required for its manufacture, storage or transport 3.2 ester insulating liquid insulating liquid consisting of fatty acid esters Note 1 to entry: Fatty acid esters are commonly prepared from the reaction of alcohols and carboxylic acids or found naturally in vegetable oils and fats. 3.3 modified ester insulating liquid ester insulating liquid which has been made/synthesized or altered by chemical reaction Note 1 to entry: The chemical reaction could come about by means of organic chemistry processes, or biochemical processes including enzymatic reactions. Note 2 to entry: Modified ester insulating liquids can, for example, be composed of triglycerides, polyol esters, fatty acid monoesters, fatty acid diesters or combinations thereof. 3.4 blended ester insulating liquid homogeneous combination of unused natural, synthetic and/or modified esters that are miscible Note 1 to entry: The natural esters in this definition are those defined in IEC 62770, synthetic esters in this definition are those defined in IEC 61 099. 3.5 additive chemical substance which is deliberately added to an insulating liquid in small proportion in order to improve certain characteristics