1. What is a Three Phase Motor Power Calculator?

Definition: This calculator estimates the power consumption of a three-phase motor based on voltage, current, and power factor.

Purpose: It helps electrical engineers, technicians, and maintenance personnel determine motor power requirements for proper sizing and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Power in kilowatts (kW)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amps)
• \( PF \) — Power factor (0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for all three phases in the system and converts the result to kilowatts.

3. Importance of Three Phase Power Calculation

Details: Accurate power calculation ensures proper motor selection, circuit protection, and energy efficiency in industrial applications.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts, current in amps, and power factor (default 0.85). All values must be > 0, with PF between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor and why is it important?
A: Power factor represents the phase difference between voltage and current. It affects the actual power delivered to the motor (0 = no power, 1 = full power).

Q2: What's a typical power factor for motors?
A: Most three-phase motors have PF between 0.8-0.9 when fully loaded, but this drops at partial loads.

Q3: How do I measure line-to-line voltage?
A: Use a multimeter to measure between any two phase conductors (not phase-to-neutral).

Q4: Can I use this for single-phase motors?
A: No, use our Single Phase Power Calculator as the formula is different (no √3 factor).

Q5: How does this relate to motor horsepower?
A: 1 HP ≈ 0.746 kW. Multiply kW result by 1.34 to convert to horsepower.