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For a primary winding

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Type power or electrical rating is

Active power of a rectified current is

,

i.e. Pad is approximately 2,5 times greater than Pd. That is the reason of increasing of the transformer. In the core of the transformer is created the additional permanent magnetic flux penetrating the core due to a constant component of a secondary winding current. This phenomenon is named as the permanent magnetization of the transformer. As a result the magnetizing current grows up by a few times. So it is necessary to increase sections of a wire of a primary winding and the dimensions of the transformer at whole. It is also necessary to increase the dimensions of the transformer thanks availability of higher harmonics at primary current.

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