Formula to Calculate Amps from kVA [kVA to Ampere]

Electrical transformers and heavy machines are often rated in kVA (kilovolt-ampere). Today you'll learn the formula to calculate amps from kVA.

formula-to-calculate-amps-from-kva

Single Phase Circuits

Single phase amps are defined as multiple of 1000 times kVA divided by voltage.

Mathematically

Amps (1 φ) = [kVA * 1000] / E

Example: Find the current drawn by a single phase 5 kVA circuit at a rated voltage of 400 volts.

Solution: I = [5 * 1000] / 400 = 12.5 A

Two Phase Circuits

Three phase amps are defined as 1000 times kVA divided by 2 times system voltage.

Mathematically

Amps (2 φ) = [kVA * 1000] / [E * 2]

Example: Find the current drawn by a two-phase 3 kVA circuit at a rated voltage of 230 V.

Solution: I = [3 * 1000] / [230 * 2] = 6.52 A

Three Phase Circuits

Three phase amps are defined as 1000 times kVA divided by 1.73 times system voltage.

Mathematically

Amps (3 φ) = [kVA * 1000] / [E * 1.73]

Example: Find the current drawn by a three phase 8 kVA circuit at a rated voltage of 480 volts.

Solution: I = [8 * 1000] / [480 * 1.73] = 9.63 A

No comments:

Post a Comment