1. What is 3-Phase Power Calculation?

The 3-phase power calculation determines the real power consumed by a three-phase hydraulic pump motor. It accounts for voltage, current, power factor, and motor efficiency to provide accurate power measurement in kilowatts (kW).

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

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

Explanation: The √3 factor accounts for the phase difference in three-phase systems. The power factor represents the ratio of real power to apparent power, and efficiency accounts for energy losses in the motor.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for proper motor sizing, energy consumption analysis, electrical system design, and cost estimation in hydraulic systems.

4. Using the Calculator

Tips:

• Measure voltage between any two phases (line-to-line)
• Current should be measured per phase
• Typical power factor for motors: 0.8-0.95
• Typical motor efficiency: 0.85-0.95
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: Why use √3 in the calculation?
A: The √3 factor accounts for the 120° phase difference between the three phases in a balanced three-phase system.

Q2: What's the difference between real and apparent power?
A: Real power (kW) is the actual power consumed, while apparent power (kVA) is the product of voltage and current. The ratio is the power factor.

Q3: How does motor efficiency affect power calculation?
A: Efficiency accounts for energy losses (heat, friction). A 90% efficient motor converts 90% of electrical input to mechanical output.

Q4: When should I use this calculation?
A: Use it when sizing motors, calculating energy costs, or designing electrical systems for three-phase hydraulic pumps.

Q5: What if my system is single-phase?
A: For single-phase systems, use P = V × I × PF × η (without the √3 factor).