What is the breakdown voltage of power transformer oil?

The breakdown voltage of power transformer oil is a crucial parameter in assessing the insulating properties of the oil. It indicates the maximum voltage that the oil can withstand before electrical breakdown occurs, leading to a conductive path that can cause equipment failure. Typically, the breakdown voltage for high-quality transformer oil should be above 30 kV for a 2.5 mm gap, but the exact value can vary based on the oil’s purity, moisture content, and presence of contaminants. Regular testing using Globecore’s oil breakdown voltage tester is essential to ensure the reliability and efficiency of power transformers, as it helps maintain optimal performance and prevents failures, extending the lifespan of the equipment.