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

Askarel transformer oil is a synthetic dielectric fluid used in power transformers, primarily composed of polychlorinated biphenyls (PCBs). It is utilized for its excellent insulating properties and thermal stability, allowing efficient heat dissipation and electrical insulation in high-voltage applications. However, due to environmental and health concerns associated with PCBs, the use of askarel transformer oil has been largely phased out in favor of more environmentally friendly alternatives.