What does the interfacial tension test of transformer oil show?

The interfacial tension test transformer oil is a crucial assessment that measures the oil’s ability to maintain its insulating properties and contaminate resistance. It indicates the presence of polar compounds, which can arise from oxidation, hydrolysis, or contamination. A decrease in interfacial tension suggests degradation of the oil, leading to increased risk of failures in electrical equipment due to the loss of insulating capability. Regular testing helps determine the oil’s condition, predict its lifespan, and ensure the reliability of transformer operations.