1. What is Three-Phase Power Calculation?

Definition: This calculator computes the real power in kilowatts (kW) for a three-phase electrical system.

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, between 0 and 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for all three phases and the phase difference between voltage and current.

3. Importance of Three-Phase Power Calculation

Details: Accurate power calculation is essential for proper equipment sizing, energy efficiency, 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, with 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.

Q2: What's a typical power factor value?
A: For 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 values?
A: This uses line-to-line voltage and line current (most common measurement scenario).

Q4: Why √3 in the formula?
A: The √3 accounts for the 120° phase difference between the three phases in a balanced system.

Q5: How do I measure these values?
A: Use a multimeter for voltage, clamp meter for current, and power analyzer for power factor.