What is the dielectric breakdown strength of transformer oil in power transformers?

The dielectric breakdown strength of transformer oil in power transformers is a critical parameter that indicates the oil’s ability to withstand electrical stress without failing. Typically, the dielectric breakdown strength of high-quality transformer oil ranges from 30 to 70 kV per millimeter. This property is essential for ensuring the safe operation of power transformers, as it prevents electrical discharges that could lead to equipment failure or fire hazards. Regular testing of this strength is vital for maintenance.