Filter cartridges remove suspended solids such as cellulose fibers from paper insulation, carbon particles, metallic wear debris, and sludge fragments. Depending on micron rating, they can also reduce fine particulate contamination that lowers dielectric strength and accelerates insulation damage. Cartridges do not remove dissolved moisture or gases by themselves, so effective oil treatment often combines filtration with vacuum dehydration and degassing. Cartridge condition is monitored by differential pressure, and elements are replaced to avoid bypass or reduced flow that can limit treatment effectiveness.
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