Motor kVA Calculator

Calculate apparent power (kVA) for electric motors

Motor kVA Calculator

Compliant with IEC 60034 Standards

Results:

Apparent Power (kVA): 0.00

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How to Use the Calculator

Input Motor Details

  1. Select Motor Power Type (HP or kW)
  2. Enter Motor Power value
  3. Provide Voltage (V)
  4. Input Motor Efficiency (%)
  5. Enter Power Factor (0-1)
  6. Select Phase (Single or Three)

Calculate kVA

  1. Click the "Calculate" button
  2. The Apparent Power (kVA) will be displayed
  3. Use the "Reset" button to clear inputs

Understanding Results

  1. kVA represents the total apparent power drawn by the motor.
  2. It's crucial for sizing electrical components like transformers and cables.
  3. Higher efficiency and power factor reduce kVA for the same mechanical output.

Motor kVA Fundamentals

Apparent Power (kVA)

kVA (kilo-Volt-Amperes) is the apparent power, which is the total power flowing into an electrical circuit from a source. It is the product of the voltage and current, without considering the power factor or efficiency.

  • Important for sizing electrical infrastructure.
  • Includes both real (kW) and reactive (kVAR) power.

Efficiency & Power Factor

  • Efficiency: Ratio of mechanical output power to electrical input power.
  • Power Factor: Ratio of real power (kW) to apparent power (kVA).
  • Both impact the actual electrical load and kVA.

Key Formula:

kVA = (Motor Power (kW) / (Efficiency / 100)) / Power Factor

Where Motor Power (kW) is the mechanical output power.

Calculation Formulas

If Motor Power is in HP:
kW_mechanical = HP × 0.746

Then, for both HP and kW input:
kVA = (kW_mechanical / (Efficiency / 100)) / Power Factor

Example Calculation

Three Phase AC Motor:

Motor Power: 10 HP

Voltage: 400V

Efficiency: 85%

Power Factor: 0.8

kW_mechanical = 10 HP × 0.746 = 7.46 kW

kVA = (7.46 kW / (85 / 100)) / 0.8

kVA = (7.46 / 0.85) / 0.8

kVA = 8.776 / 0.8 = 10.97 kVA

Result: 10.97 kVA

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