1. What is Three Phase Motor Power Calculation?

Definition: This calculator computes the real power (in kilowatts) consumed by a three-phase electric motor based on voltage, current, and power factor.

Purpose: It helps electrical engineers, technicians, and maintenance personnel determine motor power consumption for energy management and system design.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Real power (kilowatts)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Line current (amps)
• \( PF \) — Power factor (unitless, 0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems

Explanation: The formula accounts for all three phases in the system and converts the result to kilowatts by dividing by 1000.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for sizing electrical components, energy efficiency analysis, and cost estimation.

4. Using the Calculator

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

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 a typical power factor value?
A: Induction motors typically have power factors between 0.8 and 0.9 when fully loaded.

Q3: Should I use line or phase values?
A: This calculator uses line-to-line voltage and line current values (standard for three-phase calculations).

Q4: How does this differ from single-phase calculation?
A: Three-phase power includes the √3 factor and is more efficient for the same power transfer.

Q5: Can I calculate horsepower from this result?
A: Yes, 1 kW ≈ 1.341 horsepower. Multiply kW result by 1.341 to get HP.