1. What is 3 Phase Current Calculation?

Definition: This calculator determines the electrical current (amperes) in a three-phase system based on power (kW), voltage, and power factor.

Purpose: Essential for electrical engineers and technicians to properly size wires, circuit breakers, and other electrical components.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amperes)
• \( kW \) — Power in kilowatts
• \( V \) — Line voltage (volts)
• \( PF \) — Power factor (decimal between 0 and 1)

Explanation: The formula converts kW to watts (×1000), then divides by the product of √3 (1.732), voltage, and power factor to get current.

3. Importance of Current Calculation

Details: Accurate current calculation ensures electrical safety, prevents equipment damage, and helps in energy-efficient system design.

4. Using the Calculator

Tips: Enter power in kW, system voltage (default 400V), and power factor (default 0.8). All values must be > 0, with PF between 0.1 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical power factor value?
A: Industrial systems typically range 0.8-0.95, while poor power factors are below 0.7.

Q2: Why √3 in the formula?
A: It accounts for the phase difference in three-phase systems (120° between phases).

Q3: What voltage should I use?
A: Common three-phase voltages are 208V, 400V, 480V - use your system's line-to-line voltage.

Q4: Can I calculate for single-phase systems?
A: No, this is for three-phase only. Single-phase uses a different formula without √3.

Q5: How accurate is this calculation?
A: It provides theoretical current. Actual current may vary due to harmonics, temperature, and other factors.