1. What is a Three Phase Wattage Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Real power (watts)
• \( V \) — 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 in the system 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 ≤ 1.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: Line voltage is between any two phases, while phase voltage is between a phase and neutral. Line voltage = √3 × phase voltage.

Q2: What is a typical power factor value?
A: Motors typically have PF 0.8-0.9, resistive loads have PF 1.0, and capacitive/inductive loads have lower PF.

Q3: Why use √3 in the formula?
A: The √3 factor accounts for the 120° phase difference between the three phases in a balanced system.

Q4: Does this calculate real or apparent power?
A: This calculates real power (watts). Apparent power (VA) would exclude the power factor.

Q5: How do I measure three-phase current?
A: Use a clamp meter on any one phase conductor (current should be balanced in a healthy system).