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

The transformer kVA rating can be used to calculate amps.

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

kVAVoltageSingle Phase AmpsThree Phase Amps
5001204166.6672408.478
5002082403.8461389.506
5002202272.7271313.715
5002302173.9131256.597
5004801041.667602.1195
5001 kV500289.0173
5001.5 kV333.3333192.6782
5002.2 kV227.2727131.3715
5003.3 kV151.515287.58101
5005.5 kV90.9090952.54861
50011 kV45.4545526.2743
50066 kV7.5757584.379051
500230 kV2.1739131.256597
500400 kV1.250.722543
500500 kV10.578035
50033 kV15.151528.758101

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

kVAVoltageSingle Phase AmpsThree Phase Amps
10001208333.3334816.956
10002084807.6922779.013
10002204545.4552627.43
10002304347.8262513.194
10004802083.3331204.239
10001 kV1000578.0347
10001.5 kV666.6667385.3565
10002.2 kV454.5455262.743
10003.3 kV303.0303175.162
10005.5 kV181.8182105.0972
100011 kV90.9090952.54861
100066 kV15.151528.758101
1000230 kV4.3478262.513194
1000400 kV2.51.445087
1000500 kV21.156069
100033 kV30.3030317.5162
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