1. What is 3-Phase Power Calculation?

Definition: This calculator computes the real power in a three-phase electrical system based on voltage, current, and power factor.

Purpose: It helps electrical engineers, technicians, and electricians determine the actual power consumption in three-phase systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Real power (kilowatts)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amps)
• \( PF \) — Power factor (unitless, 0-1)
• \( \sqrt{3} \) — Constant for three-phase systems

Explanation: The formula accounts for all three phases and converts the result to kilowatts by dividing by 1000.

3. Importance of 3-Phase Power Calculation

Details: Accurate power calculation is essential for proper equipment sizing, energy efficiency analysis, and electrical system design.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts, current in amps, and power factor (default 0.8). All values must be > 0.

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.

Q2: What's a typical power factor value?
A: For industrial motors, it's typically 0.8-0.9. Resistive loads have PF=1, while inductive loads have lower PF.

Q3: Is this formula for line or phase voltage?
A: The formula uses line-to-line voltage (not phase voltage) for standard three-phase calculations.

Q4: How do I measure three-phase current?
A: Use a clamp meter on any one of the three phase conductors (current should be balanced in ideal conditions).

Q5: Can I use this for single-phase systems?
A: No, for single-phase use \( P_{kW} = \frac{V \times I \times PF}{1000} \) (without the √3 factor).