1. What is 3-Phase Power?

Three-phase power is a common method of alternating-current electric power generation, transmission, and distribution. It's more efficient than single-phase power for large loads and industrial applications.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Line-to-line voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (unitless, 0 to 1)

Explanation: The formula calculates real power in a balanced three-phase system. The √3 factor accounts for the phase difference between the three phases.

3. Importance of Power Factor

Details: Power factor represents the ratio of real power to apparent power. A lower power factor indicates inefficient power usage with more reactive power in the system.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amperes, and power factor (0 to 1). For purely resistive loads, power factor is 1. For inductive loads (like motors), it's typically 0.8-0.9.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line-to-line and line-to-neutral voltage?
A: In a 3-phase system, line-to-line voltage is √3 times the line-to-neutral voltage. This calculator uses line-to-line voltage.

Q2: Can I use this for single-phase calculations?
A: No, for single-phase use P = V × I × PF (without the √3 factor).

Q3: What is a typical power factor value?
A: For resistive loads it's 1. For motors it's typically 0.8-0.9. Poor power factor (below 0.8) may require correction.

Q4: How does this differ from apparent power?
A: This calculates real power (watts). Apparent power (VA) would be √3 × V × I without the PF factor.

Q5: Why is three-phase power more efficient?
A: Three-phase provides constant power transfer (vs. pulsating in single-phase) and uses less conductor material for the same power transfer.