AC Power Calculator 3-Phase

3-Phase Power Formula:

\[ P_{kW} = \frac{V \times I \times PF \times \sqrt{3}}{1000} \]

Power (P_kW): kW

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1. What is a 3-Phase AC Power Calculator?

Definition: This calculator computes the real power in kilowatts for a balanced three-phase AC electrical system.

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

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_{kW} = \frac{V \times I \times PF \times \sqrt{3}}{1000} \]

Where:

\( P_{kW} \) — Real power (kilowatts)
\( V \) — Line-to-line voltage (volts)
\( I \) — Line current (amps)
\( PF \) — Power factor (unitless, 0 to 1)
\( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula accounts for all three phases in the system and converts the result to kilowatts.

3. Importance of 3-Phase Power Calculation

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

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts, line 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: Is this for line-to-line or line-to-neutral voltage?
A: The calculator uses line-to-line (phase-to-phase) voltage.

Q3: What's a typical power factor value?
A: For motors, 0.8-0.9 is common. Resistive loads have PF=1, while inductive loads have lower PF.

Q4: Can I use this for single-phase systems?
A: No, use our Single-Phase Power Calculator for single-phase systems.

Q5: Why divide by 1000?
A: This converts the result from watts to kilowatts (1 kW = 1000 W).