Online filtration continuously removes moisture, dissolved water, and particulates while the transformer remains energized, helping maintain dielectric strength and reducing aging stress on paper insulation. It can also slow oxidation by reducing catalytic contaminants and improving oil cleanliness. This supports higher reliability by stabilizing key metrics like BDV and moisture ppm, reducing partial discharge risk, and extending maintenance intervals. Online systems are especially useful for critical assets where outages are costly, though they must be properly engineered to avoid leaks and air ingress.
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