1. What is a Three Phase Voltage Calculator?

Definition: This calculator determines the line-to-line voltage in a three-phase electrical system based on power, current, and power factor.

Purpose: It helps electrical engineers, technicians, and electricians verify or calculate system voltages in three-phase power systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Three Phase Voltage Calculation

Details: Accurate voltage calculation is essential for proper equipment sizing, system design, and troubleshooting in three-phase power systems.

4. Using the Calculator

Tips: Enter the power in kW, current in amps, and power factor (default 0.8). Power factor must be between 0.01 and 1. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It affects voltage calculation because not all current does useful work.

Q2: What's a typical power factor value?
A: For motors, 0.8-0.9 is common. Resistive loads have PF=1. The default 0.8 is a good estimate for mixed industrial loads.

Q3: Does this calculate line-to-line or line-to-neutral voltage?
A: This calculates line-to-line (phase-to-phase) voltage, which is standard for three-phase power systems.

Q4: Can I use this for single-phase systems?
A: No, for single-phase use \( V = P_{kW} \times 1000 / (I \times PF) \) (remove the √3 factor).

Q5: Why multiply power by 1000 in the formula?
A: This converts kilowatts to watts (1 kW = 1000 W) since current is in amps and voltage in volts (1 V = 1 W/A).