How to convert kVA to amps

How to convert apparent power in kilovolt-amps (kVA) to electric current in amps (A).

You can calculate amps from kilovolt-amps and volts, but you can't convert kilovolt-amps  to amps since kilovolt-amps and amps units do not measure the same quantity.

Single phase kVA to amps calculation formula

To convert apparent power in kilovolt-amps (kVA) to electric current in amps (A), you can use the formula:

I(A) = 1000 × S(kVA) / V(V)

where

  1. I is the phase current in amps,
  2. S is the apparent power in kilovolt-amps, and
  3. V is the RMS voltage in volts.

To use this formula, simply substitute the values for S and V into the equation and solve for I. In the example you provided, the apparent power was 3 kVA and the RMS voltage supply was 110 volts, so the phase current is calculated as follows:

I(A) = 1000 × 3 kVA / 110 V = 27.27 A

Therefore, the phase current in this example is 27.27 amps.

It's important to note that this formula is specific to single phase systems. For three phase systems, the formula would be slightly different, taking into account the phase angle between the three phases. You can use the following formula to calculate the current in amps for a three phase system:

I(A) = 1000 × S(kVA) / (√3 × V(V))

where S is the apparent power in kilovolt-amps, V is the RMS voltage in volts, and √3 is the square root of 3.

3 phase kVA to amps calculation formula

Calculation with line to line voltage

To convert apparent power in kilovolt-amps (kVA) to electric current in amps (A) in a three phase system, you can use the formula:

I(A) = 1000 × S(kVA) / (√3 × VL-L(V))

where

  1. I is the phase current in amps,
  2. S is the apparent power in kilovolt-amps, and
  3. VL-L is the line to line RMS voltage in volts.
  4. √3 is the square root of 3.

To use this formula, simply substitute the values for S and VL-L into the equation and solve for I. In the example you provided, the apparent power was 3 kVA and the line to line RMS voltage supply was 190 volts, so the phase current is calculated as follows:

I(A) = 1000 × 3 kVA / (√3 × 190 V) = 9.116 A

Therefore, the phase current in this example is 9.116 amps.

It's important to note that this formula assumes that the line to line voltage is being used as the reference voltage. If the phase to neutral voltage is being used as the reference voltage, the formula would be slightly different. You can use the following formula to calculate the current in amps for a three phase system using the phase to neutral voltage as the reference:

I(A) = 1000 × S(kVA) / (√3 × VL-N(V))

where S is the apparent power in kilovolt-amps, and VL-N is the phase to neutral RMS voltage in volts.

Calculation with line to neutral voltage

To convert apparent power in kilovolt-amps (kVA) to electric current in amps (A) in a three phase system, you can use the formula:

I(A) = 1000 × S(kVA) / (3 × VL-N(V))

where

  1. I is the phase current in amps,
  2. S is the apparent power in kilovolt-amps, and
  3. VL-N is the phase to neutral RMS voltage in volts.

To use this formula, simply substitute the values for S and VL-N into the equation and solve for I. In the example you provided, the apparent power was 3 kVA and the phase to neutral RMS voltage supply was 120 volts, so the phase current is calculated as follows:

I(A) = 1000 × 3 kVA / (3 × 120 V) = 8.333 A

Therefore, the phase current in this example is 8.333 amps.

It's important to note that this formula assumes that the phase to neutral voltage is being used as the reference voltage. If the line to line voltage is being used as the reference voltage, the formula would be slightly different. You can use the following formula to calculate the current in amps for a three phase system using the line to line voltage as the reference:

I(A) = 1000 × S(kVA) / (√3 × VL-L(V))

where S is the apparent power in kilovolt-amps, and VL-L is the line to line RMS voltage in volts. √3 is the square root of 3.

 

How to convert amps to kVA ►

 


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