Construction
The transformer s for these are made much the same way smaller transformers are made. Most use a "C" or "E" shaped core made from laminations of sheet steel stacked and either glued together with resin or banded together with steel straps. The low current, high voltage primaries are wound from enamel coated copper wire and the high current, low voltage secondaries are wound using a thick ribbon of aluminum or copper insulated with resin-impregnated paper. The entire assembly is baked to cure the resin then submerged in a large (usually gray) powder coated steel tank which is then filled with high purity mineral oil, which is inert and non-conductive. The mineral oil helps dissipate heat and protects the transformer from moisture, which will float on the surface of the oil. The tank is temporarily depressurized to remove any remaining moisture that would cause arcing and is sealed against the weather with a gasket at the top.
Read more about this topic: Distribution Transformer
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