What is the dp value of transformer oil in power transformers?

The dp value of transformer oil in power transformers refers to the dielectric strength, which is crucial for preventing electrical breakdown. Typically, the dp value is measured in kilovolts per millimeter (kV/mm) and indicates the oil’s ability to withstand electrical stress. A higher dp value signifies better insulation properties, ensuring the safe operation of power transformers under high voltage conditions. Regular testing of the dp value is essential for maintenance and reliability.