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 generators 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 (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 accounts for the phase difference in three-phase systems and the efficiency represented by the power factor.

3. Importance of Power Factor

Details: Power factor (PF) represents the ratio of real power to apparent power. A higher PF (closer to 1) indicates more efficient power usage. Typical generators have PF between 0.8 and 1.0.

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 with power factor between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is line-to-line voltage?
A: It's the voltage measured between any two of the three phases in a three-phase system, also called phase-to-phase voltage.

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 for generators?
A: Most generators operate at power factors between 0.8 and 0.95. The calculator defaults to 0.8 which is a common conservative value.

Q4: Can I use this for single-phase systems?
A: No, for single-phase systems use P = V × I × PF (without the √3 factor).

Q5: How does this relate to generator sizing?
A: This calculates real power output. Generator capacity is typically rated in kVA (apparent power), which is calculated as √3 × V × I without the PF.