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 motors and other heavy loads.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

Where:

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

Explanation: The formula accounts for the phase relationship in three-phase systems, with the √3 factor (approximately 1.732) converting between line and phase values.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for sizing electrical equipment, determining energy consumption, and ensuring proper operation of three-phase motors and other industrial equipment.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amps, and power factor as a decimal (e.g., 0.85). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: 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.

Q2: What's the difference between line and phase voltage?
A: In three-phase systems, line voltage is between any two lines, while phase voltage is between any line and neutral.

Q3: What is a typical power factor for motors?
A: Induction motors typically have power factors between 0.75 and 0.9 when fully loaded, lower when lightly loaded.

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

Q5: How do I measure three-phase current?
A: Use a clamp meter on any one of the three phase conductors (current should be balanced in normal operation).