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An external characteristic in per unit values

Let’s divide the right and left parts of the equation of an external characteristic by E_d0:

Let I_dR – a rated load current. In view of it we could note

If to take into account, that

then

Let's take into account, that an impedance voltage of transformer

From here, we should set up an equation of external characteristic of a single-phase circuit with a centre tap

If this equation to note as

there is suited for any circuit of rectifying with the proper value of A.

1.9 A single-phase bridge rectifier

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