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Efficiency

Active losses of a converter are

1) The thyristor losses ∆ Р_T.

2) The transformer losses

∆Р_Tr = ∆Р_St+ ∆Р_Cop,

where ∆Р_St - steel losses;

∆Р_Cop - Cop-losses in windings.

3) The reactors losses ∆Р_R (anodic, smoothing and current-balancing).

4) Losses in the auxiliary equipment (a control and regulation system, cooling system) ∆P_Aux.

∆Р_St and ∆Р_Aux are constant and are not load-depending.

For middle-and high-voltage sets

where m - number of thyristors in the circuit,

∆U_T - a voltage drop on the thyristor.

More precisely if to take into account current-voltage diagrams of the thyristor

where k_f - the form factor.

Then, for low-voltage rectifiers

Primary windings of the transformer losses

where n₁ - number of primary windings,

R₁ - resistance of a primary winding.

Secondary windings losses the transformer

where n₂ - number of secondary windings;

R₂ - resistance of secondary windings.

Reactor losses

where ∆Р_SmR – the smoothing reactor losses,

∆Р_CBR - the current-balancing reactor losses,

∆Р_AR - the anodic reactor losses.

The core of reactors losses, as a rule, do not take into account.

Thus, at L_d≈∞

At Ld <∞ it is necessary to add a addendum into a denominator

For converters of low power

where η _Th – thyristor block efficiency,

η _Tr - transformer efficiency,

η _f – filter efficiency.

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