What is synthetic ester transformer oil and how is it used in power transformers?

Synthetic ester transformer oil is a type of insulating and cooling fluid made from synthetic esters, which are derived from renewable sources. It is used in power transformers to provide electrical insulation and thermal management. Synthetic ester transformer oil has a higher flash point and better biodegradability compared to mineral oils, making it a safer and more environmentally friendly option. Its properties enhance the performance and longevity of power transformers, especially in environmentally sensitive areas.