1. What is a 3-Phase kVA Calculator?

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

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

3. Importance of kVA Calculation

Details: Proper kVA calculation ensures correct sizing of transformers, generators, and circuit protection devices in three-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 (volts × amps), while kW is real power (kVA × power factor). kVA accounts for the total power in the system.

Q2: Is this for line-to-line or line-to-neutral voltage?
A: The calculator uses line-to-line (phase-to-phase) voltage.

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 voltage for three-phase systems?
A: Common voltages include 208V, 240V, 480V, or higher for industrial applications.

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.