what is sludge in transformer oil?

Sludge in transformer oil refers to the accumulation of solid contaminants and degradation products that form over time due to the aging of the oil and the presence of moisture, dirt, and metal particles. This sludge can hinder the oil’s insulating properties, reduce heat transfer efficiency, and lead to potential transformer failures. Regular monitoring and maintenance, including oil filtration and replacement, are essential to manage sludge and ensure the reliable operation of transformers.