What is Transformer Oil: Types, Properties & Uses

Transformer oil is a specially refined insulating fluid used in transformers and other high-voltage electrical equipment to provide effective electrical insulation, remove heat generated during operation, and protect internal components from oxidation and moisture. It is mainly available as mineral oil, silicone oil, and ester-based oils (natural and synthetic), each offering different advantages in terms of fire safety, thermal performance, and environmental impact. Key properties of transformer oil include high dielectric strength, excellent thermal stability, low viscosity, low moisture content, and good oxidation resistance. Transformer oil is commonly used in power and distribution transformers, switchgear, circuit breakers, and high-voltage capacitors to ensure safe operation, prevent electrical failures, and extend equipment lifespan.