1. What is 3-Phase Current Calculation?

The 3-phase current calculation determines the current flowing through each phase of a three-phase electrical system. It's essential for designing and analyzing balanced three-phase circuits in power distribution systems.

2. How Does the Calculator Work?

The calculator uses the 3-phase current formula:

Where:

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

Explanation: The formula accounts for the balanced three-phase system where the total power is divided equally among the three phases.

3. Importance of Phase Current Calculation

Details: Accurate current calculation is crucial for selecting proper wire sizes, circuit breakers, and other electrical components to ensure safe and efficient operation of three-phase systems.

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's the difference between line and phase current?
A: In a balanced star (wye) connection, line current equals phase current. In delta connection, line current is √3 times phase current.

Q2: What if my system is single-phase?
A: For single-phase systems, use the formula: Current = Power / (Voltage × Power Factor), without the √3 factor.

Q3: What is power factor?
A: Power factor is the ratio of real power (doing work) to apparent power (product of voltage and current), ranging from 0 to 1.

Q4: What's typical power factor value?
A: For purely resistive loads it's 1.0. Motors typically have 0.8-0.9. Poor power factor (<0.8) may require correction.

Q5: Can I use this for unbalanced loads?
A: This calculator assumes balanced load. For unbalanced systems, each phase must be calculated separately.