# Lecture 16 - UCF Transformer Voltage Regulation(1 Ideal n=...

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CF Transformer Voltage Regulation (1) UCF Ideal: P N n V V S P = Non-ideal: S N n

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CF Transformer Voltage Regulation (2) UCF No load (open circuit): P nl V n Snl V ull load : Full load : S eqs S eqs Sfl P jX R n I I V V + + = % 100 / % 100 × = × = Sfl Sfl P Sfl Sfl Snl V V n V V V V VR Voltage regulation:
CF Transformer Voltage Regulation (3) UCF V S eqs S eqs Sfl P jX R n I I V + + = Discussions: ) L d i l i (i d ti ) % 100 / × = Sfl Sfl P V V n V VR (1) Load is lagging (inductive) 0 / > > VR V n V Sfl P

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CF Transformer Voltage Regulation (4) UCF S eqs S eqs Sfl P jX R I I V V + + = (2) Load is resistive (unit power factor) n 0 / > > VR V n V Sfl P (3) Load is leading (capacitive) () g( p ) 0 be may be may / > < VR V n V Sfl P
CF Transformer VR Calculation (1) UCF / V n V % 100 × = S S P V VR Given: (1) V S (fixed) (2) rated apparent power (VA) of the load ) f t f th l d (3) power factor of the load Find: I S and then V P rated S S S I V = load I V S S θ = I S : V S eqs S eqs Sfl P jX R n I I V + + =

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CF Transformer VR Calculation (2) UCF / V n V % 100 × = S S P V VR
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Lecture 16 - UCF Transformer Voltage Regulation(1 Ideal n=...

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