Hi-Pot Test Failure of Transformer Winding, Impact and Corrective Actions

The modes of failure, impact and corrective actions have been observed as an effective way to improve reliability, which is a feature used in various power grid fields. This needs continuous monitoring and evaluation of its operation to minimize the cost of the operation. The failures in the transformer are analyzed in detail to identify the reasons and the procedure to find out the solution for the same with enhanced capacity and reliability. Transformer have the most common failure known as winding failure which is detected in Hi-Pot test. Many historical findings of the examination have not showed any early indication of transformer failure, the outcome of the Hi-Pot test showed significant deformation in both primary and secondary winding. To reduce future recurrence corrective actions are suggested.