Transformers is a mutual Electromagnetic induction, transform voltage, current, and impedance devices. Function of a transformer are: voltage transformation; current transformation, impedance transformation; isolated voltage regulator (transformer magnetic saturation), and so on.

Classification of common transformers can be summarized as follows:

(A) by means of cooling:

(1) dry-type transformers: relying on natural air convection or increase the fan cooling, electricity used for high-rise buildings, high-speed charging site and partial lighting, electronic circuits, small capacity transformers.

2) for oil-immersed Transformers: rely on oil as the cooling medium, such as oil-immersed self-cooled, oil-impregnated oil-air cooling, water cooling, forced oil circulation.

(B) by winding forms:

(1) two-winding transformer: used to connect two of the power system voltage levels.

(2) three-winding Transformers: generally used for electric power systems in substations, connect three voltage levels.

(3) auto-biandianqi: used to connect different voltages of the power system. Also can be used as a normal transformers after the rise or drop.

(C) the iron core form:

(1) core transformer: used in high voltage power transformers.

(2) non-Crystal alloy transformer: amorphous alloy iron core transformer is a new type of magnetic material, no load current decreased by about 80%, is currently the preferred distribution transformer energy saving effect, especially suitable for rural power grid load rate and developing regions places lower.

(3) shell type transformers: special transformer for high current, such as electric arc furnace transformers, welding transformers; or for use in electronic equipment and televisions, radios and other power transformers Shanghai Hong-box-type transformer.

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