What is the dielectric strength of transformer mineral oil?

The dielectric strength of transformer mineral oil is a critical parameter that indicates its ability to withstand electrical stress without breaking down. It is typically measured in kilovolts per millimeter (kV/mm) and serves as an essential indicator of the oil’s insulating properties. Generally, new transformer mineral oil should have a dielectric strength of at least 30 kV or higher, while oils that have been in operation may show reduced strength due to degradation, contamination, or the presence of moisture. Regular testing using a suitable tester, such as a dielectric strength test transformer, is essential to monitor the condition of transformer mineral oil and ensure optimal performance and safety in electrical systems.