1. What is Three Phase Power?

Three-phase power is a common method of alternating-current electric power generation, transmission, and distribution. It is more efficient than single-phase power for delivering large amounts of electrical energy.

2. How Does the Calculator Work?

The calculator uses the three phase power formula:

Where:

• \( I \) — Current in Amperes (A)
• \( P \) — Power in Watts (W)
• \( V \) — Line to Line Voltage in Volts (V)
• \( \cos \phi \) — Power Factor (dimensionless, 0-1)

Explanation: The formula calculates the current flowing in a three-phase system given the power, voltage, and power factor.

3. Importance of Power Factor

Details: Power factor represents the ratio of real power flowing to the load to the apparent power in the circuit. A higher power factor indicates more efficient power usage.

4. Using the Calculator

Tips: Enter power in watts, line-to-line voltage in volts, and power factor (typically between 0.8 and 1 for most industrial loads). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between line and phase voltage?
A: In three-phase systems, line voltage is between any two phases, while phase voltage is between any phase and neutral.

Q2: What is a typical power factor value?
A: For industrial motors, power factor is typically 0.8-0.9. Resistive loads have power factor of 1.

Q3: Why do we multiply by √3 in three-phase calculations?
A: The √3 factor accounts for the phase difference between the three phases in a balanced system.

Q4: Can I use this for single-phase calculations?
A: No, for single-phase use the formula: I = P / (V × cos φ) without the √3 factor.

Q5: What happens if power factor is low?
A: Low power factor means more current is required to deliver the same real power, leading to higher losses and larger equipment requirements.