Full Load Current Turns Ratio calculator for Transformer
Compute transformer full-load current for single/three-phase and find turns ratio a = Np/Ns = Vp/Vs = Is/Ip. Includes examples and quick reference tables.
full load current calculator transformer
Rated kVA, voltage give full-load current: single-phase I = S/V, three-phase I = S/ ( sqrt 3 VLL ). Is/Ip connects the primary and secondary currents in an ideal transformer with the turns ratio a = Vp/ Vs.
Formula to Convert VA to KW
- Single Phase:
kW = (VA × PF) ÷ 1000 - Three Phase:
kW = (VA × PF × √3) ÷ 1000
VA to KW Calculator Overview
Convert volt-amperes (VA) to kilowatts (kW) using our fast and accurate VA to kW Calculator. This tool works for both single-phase and three-phase systems, using voltage and power factor to deliver precise real power values. It's ideal for engineers, electricians, and energy professionals.
Sample VA to KW Canversion Table
| VA | PF | kW (Single Phase) | kW (Three Phase) |
|---|---|---|---|
| 1000 | 0.8 | 0.8 | 1.39 |
| 5000 | 0.9 | 4.5 | 7.79 |
Frequently Asked Questions - Full Load Current Turns Ratio calculator for Transformer:
How do I calculate transformer full-load current?
Single-phase: I=S/V. Three-phase: I=S/(√3·V_LL).
What is the turns ratio formula?
a = Np/Ns = Vp/Vs = Is/Ip for an ideal transformer.
How are primary and secondary currents related?
Is = a·Ip and Ip = Is/a, inverse to the voltage ratio.
Does frequency change full-load current?
For a given kVA and voltage, FLA formulas are unchanged; frequency affects design limits, not the algebra.
How do I get kVA from amps?
Single-phase: S=V·I. Three-phase: S=√3·V_LL·I (kVA by ÷1000).
Can I use line-to-neutral voltage?
Use V_LL for 3φ formulas. If using V_phase, compute per-phase and multiply by 3.
What about transformer efficiency and regulation?
They slightly change real currents under load; use nameplate kVA/voltage for FLA and protection sizing.
How do I refer currents between sides?
Multiply/divide by a: I'primary-side = I_secondary/a, etc.
Is inrush current the same as FLA?
No. Inrush is a transient many times FLA and not used for continuous rating.
How precise should results be?
Two decimals are typical; always verify against nameplate and protection coordination.
