1. What is Three-Phase 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 three-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 three-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 Three-Phase Power Calculation

Details: Accurate power calculation is essential for sizing electrical equipment, determining energy consumption, and designing efficient electrical systems.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between line-to-line and line-to-neutral voltage?
A: In three-phase systems, line-to-line voltage is √3 times the line-to-neutral voltage (208V line-to-line = 120V line-to-neutral).

Q2: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is being converted into useful work.

Q3: When is this formula not applicable?
A: This formula assumes a balanced three-phase system. For unbalanced loads, each phase must be calculated separately.

Q4: What are typical power factor values?
A: Motors typically have PF of 0.8-0.9, resistive loads have PF=1, and capacitive/inductive loads have PF < 1.

Q5: How does this relate to single-phase power?
A: Single-phase power is P = V × I × PF (without the √3 factor). Three-phase delivers more power with less conductor material.