It is a large encased group of metal plates about the size of a small house with 2 sets of insulated copper wires wrapped around the plates -an input and output – to convert a very high transmission supply line voltage – maybe 44 thousand volts to a lower voltage of 2200 volts that runs down the power line poles in your neighbourhood. Look at your street’s power poles and you will see a mini substation that converts he 2200 volt to 220 volts and may supply several homes.
to view the rest click on the link on the left :http://wiki.answers.com/Q/What_is_a_substation_transformer
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