What maintenance is required for oil-filled power transformers?

Oil-filled power transformers require regular maintenance to ensure optimal performance and longevity. Key maintenance tasks include monitoring and testing the insulating oil for moisture, acidity, and dissolved gases, performing visual inspections for leaks or corrosion, and checking electrical connections for tightness. Additionally, periodic thermal imaging can identify hot spots, while routine cleaning of bushings and ensuring proper grounding are essential. Regular maintenance schedules should align with manufacturer recommendations and industry standards.