Transformers is a using electromagnetic induction by each other, transforms the voltage, current and impedance of the device. Transformer's main features are: voltage transformation; current transformation, impedance transformation; isolated voltage regulator (magnetic saturation of transformers).

Commonly used classification of transformers can be summarized as follows:

(A) by means of cooling:
(1) dry-type transformer by means of natural air convection or increase the fan cooling, multi for high-rise buildings, high-speed site electricity and local lighting, electronic circuits, and other small power transformer.
(2) oil-immersed Transformers: rely on oil as cooling medium, such as oil-immersed self-cooling and air-cooled, oil-soaked cold, oil-immersed forced oil circulation.
(B) by winding forms:
(1) two-winding transformer: used to connect two of the power system voltage levels.
(2) three-winding transformer is generally used to power system substations and connect three voltage levels.
(3) auto-biandianqi: used to connect different voltages of the power system. Also can be used as common step-up transformers after or drop.
(C) the iron core forms:
(1) core type transformer: high-voltage power transformers.
(2) non-Crystal alloy transformer: amorphous alloy iron core transformer used new magnetic materials, no load current reduced by about 80%, is by far the better distribution transformer energy saving effect, especially for rural power grids and low load rate of the developing areas.
(3) shell type transformers: special used for high current transformers, furnace transformers, welding transformers; or used in electronic devices and power transformers of Shanghai, such as TV, radio-box type transformer.
 
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