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Article | REF: D2471 V1

Insulating liquids in electrical engineering - Product features

Author: Noëlle BERGER

Publication date: November 10, 2002

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3. Vegetable oils

Vegetable oils were among the first insulating liquids used in the manufacture of electrical appliances (see F.M. Clark's general work in bibliography). They are essentially made up of triglycerides, i.e. triglycerol esters of fatty acids.

Their chemical formula is :

Fatty acids can be saturated (without double bonds) or unsaturated (with 1 to 6 double bonds). The iodine value quantifies the degree of unsaturation.

3.1 Uses

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