What is the transformer oil top-up procedure?

The transformer oil top-up procedure involves several key steps. First, ensure the transformer is de-energized and isolated. Check the oil level using the gauge; if low, identify the oil type and source. Use a clean, filtered oil to prevent contamination. Carefully open the filling valve and add oil until the recommended level is reached. Monitor for leaks and check the temperature. Finally, document the procedure and perform a visual inspection of the transformer.