Published: Jan 1994
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Electrical insulating liquids are utilized either to insulate components of an electrical network from each other or ground, alone or in combination with solid insulating materials. Requirements for low capacitance systems entail the use of low dielectric constant or permittivity liquids, consistent with acceptable chemical and heat transfer properties. However, when the insulating liquids are employed as impregnants in capacitors, then a higher value of dielectric constant is sought so as to reduce the physical size of the capacitors. Frequently intermediate values of dielectric constant may be advantageous for attaining a more acceptable voltage distribution between contiguous liquid and solid insulations. In order to minimize the amount of energy dissipated, which manifests itself in the form of heat thereby leading to a temperature rise of the insulating system, it is important that the dielectric loss within the insulating system be small. That is, the insulating liquids should be characterized by low values of dissipation factor, which constitutes a measure of the energy loss occurring within the dielectric liquids.
Institut de Recherche d'Hydro-Québec, Varennes, Québec