1. Mineral oils

The use of mineral oils in electrical equipment dates back almost to the beginning of industrial production. They have two main functions: electrical insulation and heat transfer.

Mineral insulating oils are obtained by distillation of selected petroleum products, natural substances of geological origin, stripped of various materials (light gases, hydrogen sulfide, water, etc.). They are complex mixtures (several thousand different molecules) of hydrocarbons, sulfur compounds, oxygenates, nitrogen compounds and traces of organometallic compounds. They are known as crudes. They are extracted in all regions of the world, and several hundred different types have been identified.

Progressive improvements in crude oil refining processes have led to the production of increasingly high-performance mineral insulating oils. These improvements, combined...

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Mineral oils

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Bibliography

Article references [D 2 471].

(1) - LIPSCOMB (T.G.) - Electrical Insulating oils – Section 1 : Refining and specification limits - . ASTM Publication STP 998, Herbert G. Erdman editor (sept. 1988).
(2) - SIEROTA (A.), RUNGIS (J) - Electrical Insulating...

Standardization

International Electrotechnical Commission IEC

http://www.iec.ch/catig-f.htm

Matériel électrique pour atmosphères gazeuses explosives. Quatrième partie : Méthode d'essai. - CEI 60079 - (1975)
Isolants liquides. Détermination de la tension de claquage à fréquence industrielle. Méthode d'essai. - CEI 60156 - (1995-08)