what is dielectric strength of transformer oil?

Dielectric strength of transformer oil refers to its ability to withstand electric stress without breaking down or conducting electricity. It is measured in kilovolts per millimeter (kV/mm) and indicates the oil’s effectiveness as an insulating material. High dielectric strength is crucial for transformer operation, as it prevents electrical breakdown and ensures reliable performance. Typically, transformer oil has a dielectric strength of around 30 to 50 kV/mm, depending on its purity and condition.