How to identify the transformer

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How to identify the transformer
1) identify from the appearance of commonly used power transformer iron core, which has two kinds of E and C shape.E shape iron core transformer with shell type structure (coil) core package, using D41, D42 high-quality silicon steel sheet as core, widely used.C shape iron core transformer with cold-rolled silicon steel belt as core, magnetic leakage is small, small volume, a core structure (core coil package).
2) from the winding number identification of common power supply transformer terminals have two windings, that is, a primary and a secondary winding, so there are four terminal.Some of the power transformer to prevent ac and other interference, often add a shielding layer between the primary and secondary windings, the shielding layer is ground terminal.Therefore, the power transformer terminals at least four.
3) from the silicon steel sheet laminated mode identification E of power transformer silicon steel sheet is * insert, leaving no air gap between E and I pills, fit the whole core.Audio input and output transformer of E and I with a certain air gap between each piece, this is the difference between power and audio transformer is the most intuitive way.As for C type transformer, power transformer is commonly.