What does interfacial tension indicate about transformer oil?

Interfacial tension in transformer oil indicates the oil’s ability to separate from water and other contaminants. A higher interfacial tension suggests better oil quality and lower levels of impurities, which is crucial for maintaining insulation properties and preventing electrical breakdown. Conversely, a lower interfacial tension may indicate the presence of polar contaminants, which can compromise the oil’s effectiveness and the overall reliability of the transformer. Regular monitoring is essential for optimal transformer performance.