What is relative saturation of transformer oil?

Relative saturation of transformer oil refers to the degree to which the oil can dissolve gases, primarily moisture and other volatile compounds, compared to its maximum capacity at a given temperature and pressure. It is expressed as a percentage, indicating how close the oil is to becoming saturated with dissolved gases. Monitoring relative saturation is crucial for assessing the insulation properties and overall health of the transformer, as high saturation levels can lead to reduced dielectric strength and increased risk of failure.