1. What is a 3-Phase kVA Calculator?

Definition: This calculator computes the apparent power (kVA) in a three-phase electrical system based on voltage and current.

Purpose: It helps electrical engineers, technicians, and electricians determine the power requirements for three-phase equipment and 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)
• √3 — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the phase difference in three-phase systems by multiplying by the square root of 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 greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kVA and kW?
A: kVA measures apparent power (voltage × current), while kW measures real power. They differ by the power factor (kW = kVA × PF).

Q2: Is this for line-to-line or line-to-neutral voltage?
A: The calculator uses line-to-line voltage (typically 208V, 400V, 480V in three-phase systems).

Q3: Why do we multiply by √3 in three-phase?
A: The √3 factor accounts for the 120° phase difference between the three phases in a balanced system.

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

Q5: What's a typical three-phase voltage?
A: Common voltages include 208V, 240V, 400V, 415V, 480V, depending on country and application.