1. What is 3 Phase Power Calculation?

The 3-phase power calculation converts kilowatts (kW) to amperes (A) in a three-phase electrical system. This is essential for proper sizing of wires, circuit breakers, and other electrical components in industrial and commercial applications.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( I \) — Current in amperes (A)
• \( kW \) — Power in kilowatts
• \( V \) — Line-to-line voltage in volts
• \( PF \) — Power factor (unitless, between 0 and 1)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula accounts for the three-phase power relationship where current is calculated from power, voltage, and power factor.

3. Importance of Current Calculation

Details: Accurate current calculation is crucial for electrical system design, ensuring proper wire sizing, circuit protection, and equipment selection to prevent overheating and potential fire hazards.

4. Using the Calculator

Tips: Enter power in kW, line-to-line voltage in volts, and power factor (typically 0.8-0.95 for most industrial loads). All values must be positive (power > 0, voltage > 0, 0 < PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is being converted into useful work (typically 0.8-1.0).

Q2: Is this for line-to-line or line-to-neutral voltage?
A: The formula uses line-to-line voltage (phase-to-phase voltage) in a 3-phase system.

Q3: What's the difference between 3-phase and single-phase?
A: 3-phase power uses three alternating currents (120° apart) for more efficient power delivery, while single-phase uses one.

Q4: When should I use this calculation?
A: Use for sizing conductors, breakers, and transformers in 3-phase systems like motors, HVAC, and industrial equipment.

Q5: What if I have kVA instead of kW?
A: For kVA, use: \( I = \frac{kVA \times 1000}{\sqrt{3} \times V} \) (no power factor needed).