Transformer is the parts of an apparatus of commutation alternating voltage, electric current and impedance, connect in class coil at the outset when having alternating current, core (or magnetism core) in produce communication magnetic flux, make the induction in secondary coil gives voltage (or electric current) . Transformer by core (or magnetism core) comprise with coil, coil has two or the winding of two above, the winding that receives power source among them calls primary coil, the winding of the others calls secondary coil.

One, classification

Press cooling means classification: Dry type (from cold) transformer, oily dip (from cold) transformer, fluoride (evaporate cooling) transformer. Press moistureproof means classification: Open mode transformer, fill seals type transformer, sealed transformer.

Press core or coil structure classification: Core type transformer (tab core, C core, ferrite core) , shell type transformer (core of core of swage of tab core, C, ferrite) , annulus transformer, tinsel transformer.

Count classification by power source photograph: Single-phase transformer, three-phase transformer, polyphase transformer.

Press utility classification: Power source transformer, pressure regulating transformer, frequency transformer, intermediate frequency transformer, high frequency transformer, pulse transformer.

2, the characteristic parameter of power source transformer

Loss of core of transformer of 1 job frequency and frequency concern are very big, design and reason should be used according to using frequency, this kind of frequency calls the job frequency.

2 rated power fall in formulary frequency and voltage, transformer can work for a long time, and the output power that does not provide temperature rise more than.

3 rated voltage point to the voltage that allows to bring to bear on on the coil of transformer, the regulation must not is more than to be worth when the job.

4 voltage are more primary than pointing to transformer the ratio of voltage and sub voltage, available pressure ratio carrying electricity presses compared distinction with laden report.

5 sky carry voltaic transformer when sub open a way, primary still have certain electricity, this part electric current is called carry electricity for nothing. Carry electricity for nothing by magnetization electric current (generation magnetic flux) with iron caustic electric current (cause by core loss) composition. To transformer of 50Hz power source, carry electric current to basically be equal to magnetization electric current for nothing.

6 sky record loss: Show transformer is sub when open circuit, in primary measure power loss. Main loss is core loss, it is the loss that records electric current to arise on block of primary coil copper for nothing next (cupreous caustic) , this share loss is very small.
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