"POWER TRANSFORMER" . "RDS877814" . "POWER TRANSFORMER" . . "u20683" . "IEV 421-01-01" . "A transformer that, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power." . "2006.08.10" . "9278000" . "Qualified" .