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 kilowatts (kW)
• \( V \) — Line-to-line voltage (V)
• \( I \) — Current (A)
• \( PF \) — Power factor (0-1)
• \( \eta \) — Motor efficiency (0-1)

Explanation: The formula accounts for all three phases of power, the power factor (which represents the phase difference between voltage and current), and the motor's efficiency.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for sizing electrical equipment, determining energy consumption, and ensuring proper motor operation.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amps, power factor (typically 0.8-0.95), and motor efficiency (typically 0.85-0.95). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is typical power factor for motors?
A: Induction motors typically have power factors between 0.8-0.95 at full load, lower at partial loads.

Q2: How does efficiency affect power calculation?
A: Efficiency accounts for energy losses in the motor. Higher efficiency means more input power is converted to mechanical power.

Q3: Is this formula for line or phase values?
A: The formula uses line-to-line voltage and line current (not phase values).

Q4: Can I use this for single-phase motors?
A: No, single-phase motors use a different formula: P = V × I × PF × η / 1000.

Q5: Why divide by 1000?
A: The division converts watts to kilowatts (1 kW = 1000 W).