1. What is 3-Phase Power Calculation?

The 3-phase power calculation determines the real power (in watts) delivered to a 3-phase motor or electrical system. It accounts for voltage, current, power factor, and motor efficiency to provide accurate power measurement.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Line-to-line voltage (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (0-1)
• \( \eta \) — Motor efficiency (0-1)

Explanation: The √3 factor accounts for the phase difference in 3-phase systems. Power factor and efficiency adjust for real-world losses.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for motor sizing, electrical system design, energy efficiency assessment, and proper circuit protection.

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 0.8-0.95). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: In a 3-phase system, line voltage is between any two lines, while phase voltage is between any line and neutral. The calculator uses line voltage.

Q2: Why is power factor important?
A: Power factor represents the ratio of real power to apparent power. Lower PF means more current is needed for the same real power.

Q3: What's typical motor efficiency?
A: Standard motors are typically 85-95% efficient, with higher efficiency in larger motors and premium efficiency models.

Q4: Can I use this for single-phase systems?
A: No, single-phase power calculation uses P = V × I × PF (without the √3 factor).

Q5: How accurate is this calculation?
A: It provides theoretical power. Actual power may vary due to voltage fluctuations, temperature effects, and other real-world conditions.