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eng.transformer-efficiency Calculator
Calculates transformer efficiency and voltage regulation from core loss, copper loss, and load power factor. Transformer efficiency is highest at 75–80% full load — core losses are constant; copper losses are proportional to the square of the current.
Inputs
Rated Kva
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Iron Loss Kw
Reference formula or conversion factor shown for context.
Copper Loss Kw
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Load Pf
A multiplier applied in the calculation.
Load Fraction
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Results
efficiency (%)
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
output power (kW)
Reference formula or conversion factor shown for context.
total losses (kW)
The combined total across all inputs and components.