Input Parameters
About This Calculator
- Turns ratio = Vp / Vs
- 1φ: I = kVA×1000 / V
- 3φ: I = kVA×1000 / (√3 × V)
How this transformer calculator works
The turns ratio determines voltage transformation: ratio = V_primary / V_secondary.
Current is inversely proportional: higher voltage side has lower current. Three-phase uses the √3 factor.
FAQ
Transformer current formula?
1φ: I = kVA×1000/V. 3φ: I = kVA×1000/(√3×V).
Turns ratio?
Vp/Vs. 480V/240V = 2:1 ratio.
How to size?
Sum all loads × diversity, pick next standard kVA.