DC Motor Power Calculation (3 Phase)

3-Phase Power Formula:

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

Power (P):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is 3-Phase Power Calculation?

The 3-phase power calculation estimates the power consumption or generation in a three-phase electrical system. While typically used for AC systems, this formula can also be applied to rare 3-phase DC motor systems.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

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

Where:

\( P \) — Power in watts
\( V \) — Line-to-line voltage in volts
\( I \) — Current in amps
\( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The √3 factor accounts for the phase difference in three-phase systems, converting between line and phase quantities.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for sizing electrical components, determining energy consumption, and ensuring system efficiency.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts and current in amps. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is this formula typically for AC systems?
A: Three-phase systems are predominantly AC, but some specialized DC applications (like certain industrial motors) may use three-phase configurations.

Q2: What's the difference between line and phase voltage?
A: In 3-phase systems, line voltage is between two lines, while phase voltage is between a line and neutral. For balanced systems, V_line = √3 × V_phase.

Q3: Does this account for power factor?
A: No, this is the apparent power calculation. For real power in AC systems, multiply by power factor (cosφ).

Q4: Can I use this for single-phase systems?
A: For single-phase, use P = V × I (without the √3 factor).

Q5: What are typical voltage levels for 3-phase systems?
A: Common voltages include 208V, 240V, 380V, 400V, 415V, 480V, and 600V, depending on region and application.