Comparison worksheet
Compare transformer losses on the same basis.
Enter values from two actual data sheets. This is not a brand ranking or a full ownership-cost model.
Option A
Option B
Initial values are hypothetical examples, not manufacturer specifications.
The model
Loss kW ≈ no-load loss + rated load loss × (load % ÷ 100)²
Annual loss energy ≈ loss kW × energized hours
Annual loss energy ≈ loss kW × energized hours
This model assumes a constant load during energized hours. Do not square an annual-average load to estimate losses for a varying load profile.
The simple square-law approximation omits temperature variation, changing daily load, harmonics, auxiliary cooling power, purchase price, maintenance and financing. Match the data-sheet test conditions and ratings before comparing options.