Analyze efficiency, losses, regulation, and loading across conditions. Switch methods, save reports, and inspect trends. Designed for quick study, audits, teaching, and practical planning.
Fill the fields that match your selected method. Unused fields are safely ignored. After submission, the result appears above this form.
| Scenario | Method | Key Inputs | Result Summary |
|---|---|---|---|
| Distribution unit at steady load | Direct | Input 125.00 kW, Output 120.50 kW | Efficiency = 96.40%, Loss = 4.50 kW |
| Rated review with known losses | Loss | Output 80.00 kW, Core 600 W, Full-load copper 1300 W, Load 90% | Efficiency ≈ 98.11%, Current copper loss ≈ 1053 W |
| Measured field values | Electrical | Three phase, Primary 11,000 V, 6 A, 0.92 PF; Secondary 415 V, 132 A, 0.89 PF | Efficiency computed from real input and output power |
Efficiency (%) = (Output Power / Input Power) × 100
Use this when both input power and output power are already known from measurement, logging, or test reports.
Input Power = Output Power + Core Loss + Current Copper Loss
Current Copper Loss = Full-Load Copper Loss × (Load Fraction)2
Single phase real power = V × I × PF
Three phase real power = √3 × V × I × PF
Maximum efficiency occurs when copper loss equals core loss.
The chart estimates the load where this balance happens, then plots efficiency over a load range for fast comparison.
Transformer efficiency is the percentage of input power delivered as useful output power. Higher values mean lower losses, less heating, and better operating economy at the selected load.
Use direct mode when input and output power are known. Use loss mode when core and copper losses are available. Use electrical mode when voltage, current, and power factor are measured.
Core loss stays nearly constant, while copper loss rises with current squared. Because output power and variable losses change differently, efficiency usually rises, peaks, then falls as loading increases.
It occurs when copper loss equals core loss under the chosen operating basis. This calculator estimates the load percentage where that balance appears using the supplied loss data.
No. If a result exceeds 100%, the entered measurements or units are inconsistent. Recheck power factor, current, voltage, power units, and whether input and output were reversed.
Real power depends on voltage, current, phase angle, and system type. Including power factor converts electrical quantities into usable input or output power for a more realistic estimate.
The graph is theoretical. It uses rated capacity, operating power factor, core loss, and full-load copper loss. When some values are missing, practical estimates keep the graph useful.
Yes. It is useful for classroom examples, quick audits, and maintenance comparisons. For compliance-grade studies, confirm assumptions with nameplate data, standards, test reports, and calibrated measurements.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.