Abstract
Oil-filled power transformers were first conceived and manufactured in the mid-tolate-1800s. They were (and to this day are) an essential component of the electrical power transmission and distribution infrastructure. Power transformers perform a power conversion function. A transformer takes electrical power of certain voltage and current characteristics through its primary terminals and delivers this power on its secondary terminals with changed voltage and current levels. By increasing voltage, and thus reducing the current level, power transformers minimise losses and enable the economical transmission of electrical power over long distances.
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