1. What is 3-Phase kVA?

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

Purpose: This calculator helps determine the apparent power in a 3-phase system based on voltage and current measurements.

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 including the √3 factor.

3. Importance of 3-Phase kVA Calculation

Details: Proper kVA calculation is essential for sizing transformers, circuit breakers, and other electrical equipment in 3-phase systems.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts and the 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 (voltage × current), while kW is real power (kVA × power factor).

Q2: Is this formula for line-to-line or line-to-neutral voltage?
A: This formula uses line-to-line voltage.

Q3: Why is √3 used in 3-phase calculations?
A: √3 accounts for the 120° phase difference between phases in a balanced 3-phase system.

Q4: Can I use this for single-phase systems?
A: No, for single-phase use: kVA = (V × I) / 1000 (without the √3 factor).

Q5: How does power factor affect this calculation?
A: Power factor doesn't affect kVA calculation but is needed to determine real power (kW).