Why is transformer oil filtering important for extending transformer life?

Oil filtering removes moisture, dissolved gases, acids, sludge, and solid particles that degrade dielectric strength and accelerate insulation aging. Moisture dramatically reduces breakdown voltage and speeds paper degradation. Filtration restores oil properties, improves cooling efficiency, and stabilizes electrical performance. Regular oil treatment can delay costly refurbishment or replacement, reduce failure risk, and extend transformer service life. For aging assets, oil filtration is a cost effective life extension strategy used widely in utility maintenance programs.