What are the technical aspects of what is in transformer oil?

Transformer oil primarily consists of mineral oil, which is derived from refining crude oil. It contains various hydrocarbons, typically alkanes and cycloalkanes, and may include additives for improved performance. Key technical aspects include its dielectric strength, thermal conductivity, and viscosity, which are crucial for effective insulation and heat dissipation in power transformers. Additionally, transformer oil is tested for impurities, moisture content, and oxidation stability to ensure optimal performance and longevity of the transformer.