We occasionally filter the oil by running it through a temporarily installed purifier to remove the moisture. Why should I install a DryKeep system?
Moisture within the transformer is shared between the liquid insulation (Oil) and the solid insulation (Cellulose/Paper). Only about 2% of the total moisture is dissolved in the oil with the remaining 98% trapped within the paper. For many years it was assumed that removing the moisture from the oil by periodic filtering, took care of the moisture problem. In reality, it only removed a small percentage of the water. Depending on the design of filter unit used, the transformer may have to be de-energized while this filtering process is performed. As soon as you remove the filtering unit and re-energize the transformer, moisture will diffuse from the paper will attempt to dissolve in the oil. Eventually, the temperature will level off and remain somewhat constant. The diffusion of water from the insulation tends to slow as the transformer tries to reach a state of equilibrium. The problem occurs when the oil becomes saturated before equilibrium is reached. Water continues to flow from th
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