1. What is 3-Phase Current Calculation?

The 3-phase current calculation determines the current flowing in each phase of a 3-phase AC motor or system. It's essential for proper sizing of conductors, circuit protection, and motor performance analysis.

2. How Does the Calculator Work?

The calculator uses the 3-phase current formula:

Where:

• \( I \) — Phase current (Amperes)
• \( P \) — Power (Watts)
• \( V \) — Line voltage (Volts)
• \( PF \) — Power factor (unitless, 0 to 1)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The equation accounts for the balanced three-phase power system where current is calculated based on total power, line voltage, and power factor.

3. Importance of Phase Current Calculation

Details: Accurate current calculation is crucial for selecting proper wire sizes, circuit breakers, motor protection devices, and ensuring efficient operation of 3-phase equipment.

4. Using the Calculator

Tips: Enter power in watts, line-to-line voltage in volts, and power factor (between 0 and 1). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor in 3-phase systems?
A: Power factor is the ratio of real power to apparent power, representing the phase difference between voltage and current. It ranges from 0 to 1.

Q2: Is this for line or phase current?
A: This calculates the current in each phase conductor (line current) for a balanced 3-phase system.

Q3: What's typical power factor for motors?
A: Induction motors typically have power factors between 0.8 and 0.9 at full load, lower at partial loads.

Q4: Can I use this for delta or wye connections?
A: Yes, the formula works for both configurations as long as you use the correct line-to-line voltage.

Q5: How does voltage affect current?
A: Current is inversely proportional to voltage - higher voltage systems require less current for the same power.