1. What is a 3 Phase Power Calculator?

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

Purpose: It helps electricians, engineers, and technicians determine 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 voltage (volts)
• \( I \) — Line current (amps)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula calculates the total power in a balanced three-phase system by accounting for the phase relationships between voltages and currents.

3. Importance of 3 Phase Power Calculation

Details: Accurate kVA calculation ensures proper sizing of electrical equipment, circuit protection, and power distribution systems.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts and the line 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). For resistive loads, they're equal.

Q2: Is this formula for balanced three-phase systems?
A: Yes, this formula assumes a balanced load across all three phases.

Q3: What voltage should I use - line or phase?
A: Use line-to-line voltage (not phase voltage) for this calculation.

Q4: Can I use this for single-phase calculations?
A: No, for single-phase use: kVA = (V × I) / 1000 (omit the √3 factor).

Q5: How do I convert kVA to amps?
A: Rearrange the formula: I = (kVA × 1000) / (V × √3)