1. What is 3 Phase kVA?

Definition: kVA (kilovolt-ampere) is a unit of apparent power in 3-phase electrical systems.

Purpose: This calculator converts current (amps) and voltage to kVA for balanced 3-phase systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kVA \) — Apparent power (kilovolt-amperes)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amps)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula accounts for the phase difference in 3-phase systems by multiplying by √3.

3. Importance of kVA Calculation

Details: Proper kVA calculation is essential for sizing transformers, circuit breakers, and other electrical equipment.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts and current in amps. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kVA and kW?
A: kVA is apparent power (volts × amps), while kW is real power (kVA × power factor).

Q2: Is this for line-to-line or line-to-neutral voltage?
A: This uses line-to-line voltage (typically 208V, 480V in industrial systems).

Q3: Can I use this for single-phase systems?
A: No, for single-phase use: kVA = (V × I) / 1000 (without the √3 factor).

Q4: What's a typical power factor for calculations?
A: Power factor isn't needed for kVA calculations, but is typically 0.8-0.95 for motors.

Q5: Why divide by 1000?
A: This converts volt-amperes (VA) to kilovolt-amperes (kVA).