What is the permittivity of transformer oil?

The permittivity of transformer oil typically ranges from 2.2 to 2.5 (relative permittivity or dielectric constant). This property is crucial as it affects the oil’s insulating capabilities and its performance in power transformers. The permittivity influences the electric field distribution within the transformer, impacting efficiency and reliability. Regular testing of transformer oil’s permittivity is essential for maintaining optimal transformer operation and preventing insulation failure.