1. What is Three Phase Power Calculation?

Definition: This calculator computes the real power in kilowatts (kW) for 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 (0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

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

3. Importance of Three 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, with PF between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: In three-phase systems, line voltage is between any two lines, while phase voltage is between any line and neutral.

Q2: What is a typical power factor value?
A: Motors typically have PF of 0.8-0.9, while purely resistive loads have PF=1.

Q3: Why do we multiply by √3?
A: The √3 accounts for the 120° phase difference between the three phases.

Q4: How do I measure three-phase current?
A: Use a clamp meter on any one of the three phase conductors.

Q5: Does this calculate real or apparent power?
A: This calculates real power (kW). For apparent power (kVA), omit the power factor.