1. What is 3-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 industrial and commercial applications.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( P \) — Power in Watts (W)
• \( V \) — Line voltage in Volts (V)
• \( I \) — Line current in Amperes (A)
• \( \cos\phi \) — Power factor (dimensionless, between 0 and 1)

Explanation: The √3 factor accounts for the phase difference in three-phase systems. The power factor represents the ratio of real power to apparent power.

3. Importance of Power Factor

Details: Power factor indicates how effectively electrical power is converted into useful work. A higher power factor (closer to 1) means more efficient power usage, while lower power factors indicate poor utilization of electrical power.

4. Using the Calculator

Tips: Enter line voltage (V), line current (A), and power factor (typically between 0.8 and 1 for most industrial loads). All values must be valid (voltage > 0, current > 0, power factor between 0-1).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: In a balanced 3-phase system, line voltage is √3 times the phase voltage (V_line = √3 × V_phase).

Q2: What is a typical power factor value?
A: Industrial facilities typically aim for 0.95 or higher. Motors might have 0.8-0.9 power factor at full load.

Q3: Why use 3-phase instead of single-phase?
A: 3-phase systems are more efficient for power transmission and can deliver more power without increasing conductor size.

Q4: How can I improve power factor?
A: Power factor correction capacitors can be installed to reduce reactive power and improve power factor.

Q5: Does this formula work for both delta and wye configurations?
A: Yes, as long as you use the line voltage and line current values, the formula works for both configurations.