1. What is 3-Phase kVA Calculation?

Definition: This calculator computes the apparent power in kilovolt-amperes (kVA) for three-phase electrical systems.

Purpose: It helps electricians, engineers, and technicians determine the power requirements for three-phase equipment and circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula accounts for the phase relationship in three-phase systems where voltages are 120° apart.

3. Importance of 3-Phase kVA Calculation

Details: Accurate kVA calculation is essential for proper sizing of transformers, circuit breakers, and wiring in industrial and commercial electrical systems.

4. Using the Calculator

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

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). kVA includes both working and reactive power.

Q2: When should I use this calculation?
A: For sizing three-phase transformers, generators, UPS systems, and determining circuit capacity.

Q3: Is this for line-to-line or line-to-neutral voltage?
A: The formula uses line-to-line voltage (typically 208V, 480V, etc. in North America).

Q4: What if I know kW instead of current?
A: You'll need to know the power factor to convert kW to kVA (kVA = kW/power factor).

Q5: Why is √3 used in three-phase calculations?
A: It accounts for the 120° phase difference between the three phases in a balanced system.