% Impedance of Power Transformer ?
% Impedance of Power Transformer ?
(OP)
can someone give an additional info regarding % impedance on power transformer ?
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% Impedance of Power Transformer ?
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RE: % Impedance of Power Transformer ?
RE: % Impedance of Power Transformer ?
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RE: % Impedance of Power Transformer ?
RE: % Impedance of Power Transformer ?
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RE: % Impedance of Power Transformer ?
RE: % Impedance of Power Transformer ?
Dan - Owner

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RE: % Impedance of Power Transformer ?
RE: % Impedance of Power Transformer ?
Check the nameplate
RE: % Impedance of Power Transformer ?
Second, the impedance you can read on nameplate or catalogue it is the short-circuit impedance -it is not the no-load impedance of the main magnetic circuit of transformer but the leakage impedance-most of this is due magnetic field in the surrounding air.
The impedance in % is referring to a virtual impedance Z=S/Voltage^2 that means the Zsc in ohm has to be divided by this impedance and multiplied by 100.Usually it is employed in short-circuit calculation but neglecting the no-load current impedance one can use it for voltage drop calculations.
RE: % Impedance of Power Transformer ?
I suggest a little reading about per unit impedance for a better understanding.
RE: % Impedance of Power Transformer ?
The "percent" terminology is used because the impedance is expressed based on the transformer's kVA rating, not in ohms.
Plenty of info available on-line for free on this topic, I'm sure.
RE: % Impedance of Power Transformer ?
Distribution transformers have much lower impedances, 1.8% to about 7%.
With a high X/R ratio the X will be the predominant component of the impedance. The R may predominate for full load voltage drop or regulation.
Bill
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