How is the oil breakdown voltage test conducted on transformers?

The oil breakdown voltage test in transformers is conducted using a dielectric strength tester, often referred to as a breakdown voltage tester. First, the transformer oil sample is collected under clean conditions to avoid contamination. The tester is then set up, ensuring the electrodes are clean and properly aligned. A specified voltage is applied gradually to the oil sample until dielectric breakdown occurs, which is indicated by an electrical discharge between the electrodes. The breakdown voltage is recorded, and this process helps assess the insulating properties of the transformer oil, ensuring it meets the required standards for safe operation. Regular testing of the breakdown voltage is essential for maintaining transformer performance and reliability.