What is the chemical formula of transformer oil?

The transformer oil chemical formula is not defined by a single chemical formula as transformer oil is a complex mixture primarily derived from petroleum. It mainly consists of aliphatic and aromatic hydrocarbons, with carbon (C) and hydrogen (H) being the principal elements. The composition may vary, but the generalized formula can typically be represented as CnH2n+2, where “n” represents the number of carbon atoms in the molecule. Transformer oils are tailored to meet specific electrical and thermal performance standards, ensuring insulation and cooling in transformers.