1. What is Three Phase Voltage Calculation?

The three phase voltage calculation determines the line voltage in a three-phase electrical system based on power, current, and power factor. It's essential for designing and analyzing three-phase power systems.

2. How Does the Calculator Work?

The calculator uses the three phase voltage formula:

Where:

• \( V \) — Line voltage (volts)
• \( P \) — Real power (watts)
• \( I \) — Line current (amps)
• \( PF \) — Power factor (unitless, 0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the phase relationship in three-phase systems and the power factor which represents the ratio of real power to apparent power.

3. Importance of Voltage Calculation

Details: Accurate voltage calculation is crucial for proper equipment sizing, circuit protection, and ensuring efficient power transmission in three-phase systems.

4. Using the Calculator

Tips: Enter power in watts, current in amps, and power factor (typically between 0.8 and 1.0). All values must be positive (power > 0, current > 0, 0 < PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: In three-phase systems, line voltage is between any two lines, while phase voltage is between any line and neutral. For wye connections, line voltage is √3 times phase voltage.

Q2: What is a typical power factor value?
A: Power factor typically ranges from 0.8 to 1.0. 1.0 represents purely resistive load, while lower values indicate reactive power component.

Q3: Can this be used for single-phase systems?
A: No, for single-phase systems use \( V = P / (I \times PF) \) without the √3 factor.

Q4: What if I know apparent power (kVA) instead of real power?
A: For apparent power (S), use \( V = S / (\sqrt{3} \times I) \) where S is in volt-amps.

Q5: How does unbalanced load affect the calculation?
A: This formula assumes balanced load. For unbalanced loads, each phase must be calculated separately.