Low viscosity vegetable oil-based dielectric fluids

H - Electricity – 01 – B

Patent

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H01B 3/20 (2006.01)

Patent

CA 2625185

The invention provides a low viscosity vegetable oil-based dielectric fluid composition comprising vegetable oil and alkyl esters. The physical and chemical stability of a dielectric fluid over prolonged periods of use is an important performance requirement. Thus, a vegetable oil with a high monounsaturated fatty acid content is preferred, in particular a high oleic acid vegetable oil. A blend of between 40:60 to 60:40 vegetable oil to alkyl ester will afford a dielectric fluid composition with a viscosity of < 20 cSt @ 40~C.

La présente invention se rapporte à une composition de fluide diélectrique à base d'huile végétale de faible viscosité, qui contient une huile végétale et des esters d'alkyle. La stabilité physique et chimique d'un fluide diélectrique sur des périodes d'utilisation prolongées est un critère de performance important. Ainsi, l'on préfère utiliser une huile végétale à forte teneur en acides gras monoinsaturés, en particulier une huile végétale à forte teneur en acide oléique. Un mélange présentant un rapport huile végétale:ester d'alkyle compris entre 40:60 et 60:40 permet d'obtenir une composition de fluide diélectrique présentant une viscosité inférieure à 20 cSt à 40 °C.

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