1. What is Three-Phase Power?

Three-phase power is a common method of alternating current electric power generation, transmission, and distribution. It is widely used in industrial and commercial applications due to its efficiency and ability to provide constant power delivery.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

Where:

• \( P \) — Three-phase power in watts (W)
• \( V \) — Line voltage in volts (V)
• \( I \) — Line current in amperes (A)
• \( PF \) — Power factor (unitless)
• \( \sqrt{3} \) — Mathematical constant (approximately 1.732)

Explanation: This formula calculates the real power in a balanced three-phase system, accounting for the phase relationship between voltage and current through the power factor.

3. Importance of Three-Phase Power Calculation

Details: Accurate three-phase power calculation is essential for electrical system design, equipment sizing, energy management, and ensuring efficient operation of industrial machinery and motors.

4. Using the Calculator

Tips: Enter line voltage in volts, line current in amperes, and power factor (between 0 and 1). All values must be valid (voltage > 0, current > 0, power factor between 0-1).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between line voltage and phase voltage?
A: Line voltage is the voltage between any two lines, while phase voltage is the voltage between any line and neutral. In star connection, line voltage = √3 × phase voltage.

Q2: Why is power factor important in three-phase calculations?
A: Power factor represents the ratio of real power to apparent power. A low power factor indicates poor electrical efficiency and may result in penalties from utility companies.

Q3: What are typical power factor values?
A: Power factor ranges from 0 to 1. Industrial facilities typically aim for 0.85-0.95. Values below 0.85 may require power factor correction.

Q4: Can this formula be used for unbalanced three-phase systems?
A: No, this formula is for balanced three-phase systems. Unbalanced systems require more complex calculations considering each phase separately.

Q5: How does three-phase power compare to single-phase power?
A: Three-phase systems are more efficient for power transmission, provide smoother power delivery, and require less conductor material for the same power transfer compared to single-phase systems.