How Does Impedance Affect Transformer Size?
Impedance influences transformer size primarily because it impacts the amount of current required to generate a particular quantity of power.
A lower impedance transformer will need thicker wire and a larger core material to withstand higher currents, results in a larger physical dimension.
In contrast, a higher impedance transformer may constitute smaller as it requires less current handling capacity.
The 80% rule for electrical transformers is a protection recommendation that states that a transformer’s continuous load should not exceed 80% of its rated kVA (kilovolt-ampere) capacity.
This guideline creates a safety buffer to avoid overheating, reduce insulation deterioration and handle temporary power surges.