1. What is 3-Phase kWh Calculation?

The 3-phase kWh calculation determines the energy consumption in kilowatt-hours for three-phase electrical systems, which are commonly used in industrial and commercial applications. It accounts for the balanced three-phase power delivery.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amperes)
• \( PF \) — Power factor (unitless, 0 to 1)
• \( h \) — Time duration (hours)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula calculates real power consumption by accounting for the phase relationship in three-phase systems and converting watts to kilowatt-hours.

3. Importance of 3-Phase Power Calculation

Details: Accurate energy calculation is essential for electrical system design, energy monitoring, billing, and efficiency analysis in three-phase installations.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amperes, power factor (typically 0.8-1.0), and operating time in hours. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between single-phase and three-phase kWh calculation?
A: Three-phase uses √3 factor and line-to-line voltage, while single-phase uses simple V×I without the √3 factor.

Q2: What is a typical power factor value?
A: For motors, 0.85 is common. Resistive loads have PF=1. Always check equipment specifications.

Q3: Is this calculation valid for unbalanced loads?
A: This calculator assumes balanced three-phase load. For unbalanced loads, calculate each phase separately.

Q4: Can I use this for DC systems?
A: No, for DC use simple P=V×I. Three-phase calculation is specific to AC systems.

Q5: How accurate is this calculation?
A: It provides theoretical energy consumption. Actual values may vary due to system losses and harmonics.