Filters remove suspended solids, fibers, carbon particles, and other debris that can reduce dielectric strength and accelerate aging. In purification skids, staged filtration protects sensitive dehydration components and extends equipment life. Fine filters improve BDV by reducing particle initiated breakdown paths, and some filter media can reduce polar compounds when combined with adsorption. Filters do not remove dissolved water or dissolved gases effectively, so they are paired with vacuum dehydration and degassing. Proper filter selection, differential pressure monitoring, and controlled cleanliness practices are essential for consistent results.
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