What are the differences between mineral oil and vegetable oil in transformers?

The differences between mineral oil and vegetable oil in transformers primarily lie in their chemical composition and environmental impact. Mineral oil, derived from petroleum, has excellent electrical insulating properties and thermal stability but poses environmental risks if spilled. In contrast, vegetable oil is biodegradable, renewable, and has a higher flash point, enhancing fire safety. However, it may have lower oxidation stability compared to mineral oil, affecting its long-term performance in transformers.