Abstract
TODAY many factors, including cooling, rating, and number of phases, affect the selection of the main power transformer. The types of transformer cooling now available are: type OA, self-cooled; type OW, water-cooled; type OA/FA, self-cooled/forced-air-cooled; type OA/FA/FA, self-cooled/forced-air-cooled; type FOA, forced-oil-air-cooled; and type FOW, forced-oil-water-cooled. The choice of the method of cooling for a transformer may depend on consideration of load cycle requirements, first cost, losses, reactance, installation cost, maintenance cost, shipping limitation, and other factors.
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