What are the differences between naphthenic and paraffinic transformer oil in power transformers?

The differences between naphthenic and paraffinic transformer oil in power transformers primarily lie in their chemical composition and performance characteristics. Naphthenic oils contain cycloalkanes and offer better low-temperature fluidity, making them suitable for colder climates. In contrast, paraffinic oils, rich in straight-chain hydrocarbons, exhibit higher oxidation stability and better thermal properties, which can enhance the longevity and efficiency of power transformers. Each type has specific applications based on environmental conditions and operational requirements.