Transformer kVA to Amps Rating Calculator with Calculations and Examples [Single/Three Phase Transformer]

The transformer kVA rating can be used to calculate amps.

Also see explanation of kVA to Amps formulas here

Transformer kVA to Amps Calculator

Transformer Amps from kVA rating Formulas

Single-phase Transformer Amps = Transformer kVA rating * 1000/E

Three-phase Transformer Amps = Transformer kVA rating * 1000 / (E*1.73)

Examples for Transformer Amps calculations

225 kVA, 3.3 kV Transformer amps

Find the amperage rating of a transformer having 225 kVA and 500 V in case of single and three phase

In the case of single-phase: I = 225 * 1000 / 3.3kV = 68.18 Amps

In case of three-phase: I = 225 * 1000 / (230 * 1.73) = 39.41 Amps

500 kVA, 3.3 kV Transformer Amps

• 500 kVA Single Phase Transformer: I = 500 * 1000 / 3.3kV = 151.5 Amps
• 500 kVA Three phase Transformer: I = 500 * 1000 / (3.3 * 1.73 kV) = 87.58 Amps

500 kVA Transformer Chart for Different Voltage Levels

1000 kVA Transformer Amps

• 1000 kVA Transformer Single Phase Amps when V = 33 kV: 30.30 A
• 1000 kVA Transformer Single Phase Amps when V = 33 kV: 17.51 A

1000 kVA Transformer Chart for Different Voltage Levels