1. What is Three Phase Current Calculation?

The three-phase current calculation converts power in kilowatts to current in amperes for balanced three-phase AC systems. This is essential for electrical system design, circuit protection, and equipment selection.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

Where:

• \( I \) — Current in amperes (A)
• \( 22 \) — Power in kilowatts (kW)
• \( V \) — Line-to-line voltage in volts (V)
• \( PF \) — Power factor (unitless, 0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the three-phase power relationship where current depends on voltage, power factor, and the square root of three factor for balanced three-phase systems.

3. Importance of Power Factor

Details: Power factor represents the ratio of real power to apparent power. Lower power factors result in higher current for the same real power, affecting conductor sizing and system losses.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts and power factor (typically 0.8-0.95 for most industrial loads). All values must be valid (voltage > 0, 0 < PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: Why is the square root of three used?
A: In balanced three-phase systems, the square root of three relates line-to-line voltage to phase voltage and accounts for the 120° phase separation.

Q2: What's a typical power factor value?
A: Induction motors typically have 0.85 PF, corrected systems 0.95+, and resistive loads 1.0. Always use actual measured PF when possible.

Q3: Does this work for single-phase systems?
A: No, for single-phase use I = P/(V×PF). The √3 factor is specific to three-phase.

Q4: How does voltage affect the current?
A: Current is inversely proportional to voltage. Higher voltage systems require less current for the same power.

Q5: What about efficiency?
A: This calculates input current. For output current including efficiency, divide power by efficiency before calculation.