1. What is Three Phase Power Calculation?

The three-phase power calculation determines the real power (kW) delivered by a three-phase generator or motor. It accounts for the voltage, current, and power factor in a balanced three-phase system.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

Where:

• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amperes)
• \( PF \) — Power factor (unitless, 0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)
• 1000 — Conversion factor from watts to kilowatts

Explanation: The formula calculates real power by accounting for both the magnitude and phase relationship between voltage and current in AC systems.

3. Importance of Power Factor

Details: Power factor represents the ratio of real power to apparent power. A higher PF (closer to 1) indicates more efficient power usage, while lower PF means more current is required for the same real power.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amperes, and power factor (typically 0.8-0.95 for generators). All values must be valid (voltage > 0, current > 0, PF between 0-1).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kW and kVA?
A: kW is real power (what does work), while kVA is apparent power (voltage × current). kW = kVA × PF.

Q2: Why use line-to-line voltage?
A: Three-phase systems are typically specified with line-to-line voltage (e.g., 480V, 208V) rather than phase-to-neutral.

Q3: What's a typical power factor for generators?
A: Most generators operate at 0.8-0.95 PF. Lower PF may require generator derating.

Q4: Does this work for single-phase systems?
A: No, single-phase uses P = V × I × PF (without the √3 factor).

Q5: How does this relate to generator sizing?
A: Generators are typically rated in kVA at a specific PF (often 0.8). This calculation helps determine real power output.