Motor Power Calculator 3 Phase

Three Phase Power Formula:

\[ P = V \times I \times \sqrt{3} \times PF \]

Power (P):

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1. What is Three Phase Power Calculation?

The three phase power calculation formula estimates electrical power consumption for three phase motors and systems. It provides an accurate assessment of power requirements based on voltage, current, and power factor measurements.

2. How Does the Calculator Work?

The calculator uses the three phase power formula:

\[ P = V \times I \times \sqrt{3} \times PF \]

Where:

\( P \) — Power in watts
\( V \) — Voltage in volts
\( I \) — Current in amps
\( \sqrt{3} \) — Approximately 1.732 (dimensionless)
\( PF \) — Power factor (dimensionless, between 0 and 1)

Explanation: The formula accounts for the three-phase system characteristics, where √3 represents the phase relationship between the three voltage waveforms.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for proper motor sizing, electrical system design, energy consumption analysis, and determining appropriate circuit protection devices.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, and power factor (dimensionless value between 0 and 1). All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is √3 used in three phase calculations?
A: √3 accounts for the 120-degree phase difference between the three phases in a balanced three-phase system.

Q2: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It indicates how effectively electrical power is being used, with 1.0 being ideal.

Q3: When should this calculation be used?
A: This calculation is specifically for balanced three-phase AC systems, typically used for industrial motors and heavy electrical equipment.

Q4: Are there limitations to this formula?
A: This formula assumes a balanced three-phase system with sinusoidal waveforms. It may not be accurate for unbalanced systems or systems with significant harmonics.

Q5: How does this differ from single phase power calculation?
A: Single phase power calculation uses P = V × I × PF without the √3 factor, as there's no phase relationship to account for.