Transformers are devices that alter alternating voltage using the principle of electromagnetic induction, primarily consisting of primary windings, secondary windings, and an iron core (magnetic core). Their main functions include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformers).

Transformers can be categorized by their application as: distribution transformers, power transformers, fully sealed transformers, modular transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type transformer test transformers, angle transformers, high-current transformers, excitation transformers, etc.

Transformers are fundamental equipment for power transmission and distribution, widely used in industries, agriculture, transportation, urban communities, and other fields. There are approximately 17 million transformers in operation in our country, with a total capacity of about 11 billion kilovolt-amperes. Transformer losses account for about 40% of the power losses in transmission and distribution, offering significant potential for energy saving.