精选优质文档-倾情为你奉上Transformer One of the most valuable apparatus in electric power system is the transformer, for it enables us to utilize different voltage levels across the system for the most economical value. Generation of power at the synchronous machine level is normally at a relatively low voltage，which is most desirable economicallyStepping up of this generated voltage to high voltage，extra-high voltage or even to ultra-high voltage is done through power transformers to suit the p
