How is transformer oil leak repair typically performed in the field?

Field repair begins with locating the leak source such as gaskets, valves, radiators, weld seams, or bushing interfaces. The area is cleaned, oil level is managed to reduce pressure at the leak point, and temporary containment is placed to prevent environmental release. Repairs may include tightening flanges, replacing gaskets, resealing fittings, applying approved sealants for minor seepage, or welding for structural defects during an outage. After repair, oil level is restored, air is removed if needed, and oil is sampled to confirm moisture and dielectric condition remain acceptable.