What is the dielectric breakdown voltage of transformer oil?

The dielectric breakdown voltage of transformer oil is a critical parameter that indicates its insulating properties. Typically, the dielectric breakdown voltage of transformer oil should be above 30 kV for a 2.5 mm gap, ensuring effective insulation in power transformers. Regular testing of this voltage helps assess the oil’s condition and its ability to prevent electrical discharges, which is vital for the safe operation of transformers.