1. What is a Three Phase kW Calculator?

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:

• \( P \) — Real power (kilowatts)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amperes)
• \( PF \) — Power factor (decimal between 0 and 1)

Explanation: The square root of 3 (≈1.732) accounts for the phase difference in three-phase systems. The result is divided by 1000 to convert watts to kilowatts.

3. Importance of Three Phase Power Calculation

Details: Accurate power calculation ensures proper sizing of electrical components, energy efficiency, and system safety.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts, current in amperes, 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: Typical power factor values?
A: Motors: 0.8-0.9, Resistive loads: 1.0, Fluorescent lights: 0.5-0.9.

Q3: Line-to-line vs line-to-neutral voltage?
A: This calculator uses line-to-line voltage (common in three-phase systems).

Q4: Why divide by 1000?
A: To convert the result from watts to kilowatts (1 kW = 1000 W).

Q5: Can I use this for single-phase systems?
A: No, for single-phase use P = V × I × PF (without the √3 factor).