What is the electrical strength of transformer oil in power transformers?

The electrical strength of transformer oil in power transformers is a critical parameter that indicates its ability to withstand electrical stress without breaking down. Typically, the electrical strength of transformer oil is measured in kilovolts per millimeter (kV/mm) and should ideally exceed 30 kV/mm for effective insulation. This high electrical strength helps prevent arcing and ensures reliable operation of the power transformer under high voltage conditions.