A three-phase power transformer is an electrical device used to transform the voltage levels of alternating current. It is usually composed of high-voltage windings, low-voltage windings, iron cores and oil tanks, etc. Among them, the high-voltage windings and low-voltage windings achieve voltage conversion through the principle of electromagnetic induction, the iron core serves to Подобрете магнитното поле, а масленият резервоар се използва за изолация и разсейване на топлината .
