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Definition of Transformer (adsbygoogle = window.adsbygoogle || []).push({}); A transformer is a static machine used for transforming power from one circuit to another without changing frequency. This is a very basic  definition of transformer . History of Transformer The  history of transformer  was commenced in the year 1880. In the year 1950, 400KV electrical power transformer  was introduced in high  voltage   electrical power  system. In the early 1970s, unit rating as large as 1100MVA was produced and 800KV and even higher KV class transformers were manufactured in year of 1980. Use of Power Transformer Generation of electrical power  in low  voltage level is very much cost effective. Hence electrical power  is generated in low  voltage level. Theoretically, this low  voltage  level power can be transmitted to the receiving end. But if the  voltage  level of a power is increased, the  electric current  of the power is reduced which causes reduction in ohmic or I