1. What is Three Phase kVA?

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

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:

• \( \text{kVA} \) — Apparent power (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 the square root of 3.

3. Importance of Three Phase kVA Calculation

Details: Proper kVA calculation ensures correct sizing of transformers, circuit breakers, and other electrical components 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 includes both real and reactive power.

Q2: Why do we multiply by √3 in three-phase calculations?
A: The √3 accounts for the 120° phase difference between the three phases in a balanced system.

Q3: Is this formula for line-to-line or line-to-neutral voltage?
A: This formula uses line-to-line voltage (also called phase-to-phase voltage).

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

Q5: What's a typical power factor for three-phase motors?
A: Typically 0.8-0.9, but always check manufacturer specifications for exact values.