What are ester based transformer oils and how do they benefit power transformers?

Ester based transformer oils are synthetic or natural oils derived from esters, which are organic compounds formed from the reaction of acids and alcohols. These oils benefit power transformers by providing superior dielectric properties, higher flash points, and enhanced thermal stability compared to conventional mineral oils. Additionally, ester based transformer oils are biodegradable and have lower environmental impact, making them a more sustainable choice for insulating and cooling power transformers.