What is the breakdown voltage of transformer oil?

The breakdown voltage of transformer oil is a critical parameter that assesses its insulating properties and ability to withstand electrical stress. Typically, new, quality transformer oil should have a breakdown voltage of at least 30 kV for a 2.5 mm gap, indicating good insulation performance. However, this value can vary based on the oil’s condition, moisture content, and the presence of contaminants. Regular testing using reliable devices, such as the Globecore breakdown voltage tester, is essential to evaluate the insulation performance of transformer oil accurately. Maintaining optimal breakdown voltage is crucial to preventing electrical failures in transformers, ensuring reliable operation in industrial applications, and prolonging equipment life.