This three phase transformer calculator relates kVA, line voltage, and line current. Enter any two values above to solve for the third.
Formulas
S (VA) = √3 × VL × IL IL = (kVA × 1000) ÷ (√3 × VL)
Example
30 kVA at 400 V: line current = 30,000 ÷ (√3 × 400) = 43.3 A.
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Frequently Asked Questions
How do I calculate three-phase transformer current?
Divide the kVA times 1000 by the square root of 3 times the line voltage. For 30 kVA at 400 V, that is about 43.3 amps.
What is the three-phase power formula?
Apparent power equals the square root of 3 times line voltage times line current (S = 1.732 x VL x IL).
Why the square root of 3?
It accounts for the 120-degree phase difference between the three line voltages in a balanced system.