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Transformer (Step-down)

A Transformer is a static apparatus, with no moving parts, which transforms electrical power from one circuit to another with changes in voltage and current and no change in frequency. In Step-down transformer the voltage from the Power Plant or Generation Station is around 20kV. In order to transmit this voltage over long distances, it is stepped up to 440kV using a Step up Transformer. This voltage with increased levels is then transmitted to a distribution station. At the distribution station, the 440kV is reduced to 11kV using a Step down Transformer. The voltage with decreased level is then made ready for consumer use. Before going in to the details of the Step down Transformer, we will first see the working principle of a transformer in general.

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