Natural esters distribution transformers: A solution for environmental and fire risk prevention

Abstract

The electrical transformers insulated and cooled with mineral oils remain, still today, the most widespread and effective solution for converting electrical energy. Mineral oils are used for their excellent dielectric and thermal properties, but have a low flash/fire points and biodegradability and these factors may negatively contribute in cases of fire and toxic release with contamination of soil and surface water and groundwater. For these reasons, innovative insulating fluids, such as natural esters (vegetable oils), have been suggested worldwide.