1. What is 3 Phase AC Power?

Three-phase power is a common method of alternating current electric power generation, transmission, and distribution. It is 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)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula calculates real power in a balanced three-phase system, accounting for the phase difference between voltage and current.

3. Importance of Power Factor

Details: Power factor represents the ratio of real power to apparent power. A lower power factor indicates poor electrical efficiency, with more energy lost in the distribution system.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amperes, and power factor (between 0 and 1). For purely resistive loads, power factor is 1.

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 (e.g., 400V line-to-line ≈ 230V line-to-neutral).

Q2: Why is √3 used in the formula?
A: The √3 factor accounts for the 120° phase difference between the three phases in a balanced system.

Q3: What is a typical power factor value?
A: Industrial loads typically range from 0.7 to 0.9. Resistive loads (heaters) have PF=1, while inductive loads (motors) have lower PF.

Q4: Can this formula be used for unbalanced loads?
A: No, this formula assumes a balanced 3-phase system. Unbalanced systems require more complex calculations.

Q5: How does this differ from single-phase power calculation?
A: Single-phase power is simply P = V × I × PF (without the √3 factor).