1. What is 3-Phase Current?

The phase current in a 3-phase system is the current flowing through each individual phase conductor. It's a crucial parameter for sizing electrical components like wires, breakers, and transformers.

2. How Does the Calculator Work?

The calculator uses the 3-phase current formula:

Where:

• \( Power \) — Total power in watts
• \( Voltage \) — Line-to-line voltage in volts
• \( Power Factor \) — Ratio of real power to apparent power (0-1)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The equation converts total power to current per phase, accounting for the phase relationship in 3-phase systems and power factor.

3. Importance of Phase Current Calculation

Details: Accurate current calculation is essential for proper electrical system design, preventing overheating, and ensuring safe operation of electrical equipment.

4. Using the Calculator

Tips: Enter power in watts, line-to-line voltage in volts, and power factor (typically 0.8-0.95 for most industrial loads). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line current and phase current?
A: In delta configurations, line current is √3 times phase current. In wye configurations, they're equal.

Q2: Why is power factor important?
A: Lower power factor increases current for the same real power, requiring larger conductors and equipment.

Q3: What's a typical power factor value?
A: Motors typically 0.8-0.9, resistive loads 1.0, LED lighting 0.5-0.9.

Q4: Does this work for both delta and wye systems?
A: Yes, as long as you use line-to-line voltage (not phase voltage).

Q5: How does voltage affect current?
A: Higher voltage reduces current for the same power, allowing smaller conductors.