How is the breakdown voltage of oil measured?

The breakdown voltage of oil, particularly transformer oil, is measured using a dielectric strength tester, which applies a controlled voltage to the oil sample until it breaks down. This testing device, commonly found in Globecore’s range of products, utilizes two electrodes submerged in the oil. As the voltage is gradually increased, the moment the oil becomes conductive and current flows between the electrodes indicates the breakdown voltage, an essential property that reflects the oil’s ability to insulate and prevent arcing. Accurate measurement of breakdown voltage is critical for ensuring the reliability and longevity of electrical equipment.