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Transformer Desiccant Breather Selection
Guide
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The following data should be used for the basic selection of a Transformer Breather. In order to assess the size of the breather the air volume above the oil in the conservator tank is the most important factor. The quantity of oil and the transformer rating is of secondary importance. The daily breathing rate is based on the assumption that there are two temperature drops of 8°C per 24 hours. The breathing volume change, which occurs during the pump start-up, is not taken into consideration. The typical desiccant fill for transformer breathers is 2-5 mm beaded blue indicating silica gel. Orange silica gel is also available. They cylinders on sizes R, S, T and U are manufactured from clear, shatter-proof, UV stabilized polycarbonate. The sight windows on sizes V, W, X, Y and Z and the double and treble units are manufactured from the same material. The oil-seal bowls utilize low pressure, inward and outward relief valves. It is important to emphasize that, with the exception of routine inspection to determine the condition of the desiccant, AGM Transformer Desiccant Breathers are virtually maintenance free.
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