3-Phase kW Calculator

3-Phase Power Formula:

\[ kW = \frac{\sqrt{3} \times Volts \times Amps \times PF}{1000} \]

Power (kW):

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1. What is a 3-Phase kW Calculator?

Definition: This calculator estimates the power in kilowatts (kW) for a 3-phase electrical circuit based on voltage, current, and power factor.

Purpose: It helps electricians, engineers, and technicians determine the power consumption or generation in 3-phase systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ kW = \frac{\sqrt{3} \times Volts \times Amps \times PF}{1000} \]

Where:

\( kW \) — Power in kilowatts
\( Volts \) — Line-to-line voltage (V)
\( Amps \) — Current (A)
\( PF \) — Power factor (dimensionless, between 0 and 1)

Explanation: The √3 factor accounts for the phase difference in 3-phase systems, and dividing by 1000 converts watts to kilowatts.

3. Importance of 3-Phase Power Calculation

Details: Accurate power calculation is essential for sizing equipment, determining energy consumption, and ensuring electrical system safety.

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, and power factor must be ≤ 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, 0.8-0.9 is common. 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 (standard measurements in 3-phase systems).

Q4: Can I use this for single-phase calculations?
A: No, for single-phase use: kW = Volts × Amps × PF / 1000 (without the √3 factor).

Q5: How does this relate to kVA?
A: kVA = kW / PF. kVA represents apparent power while kW represents real power.