kVA 3 Phase Calculation

3-Phase kVA Formula:

\[ \text{kVA} = \frac{V \times I \times \sqrt{3}}{1000} \]

Apparent Power (kVA):

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1. What is 3-Phase kVA Calculation?

Definition: This calculator determines the apparent power in kilovolt-amperes (kVA) for a three-phase electrical system.

Purpose: It helps electricians, engineers, and technicians calculate power requirements for three-phase equipment and systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{kVA} = \frac{V \times I \times \sqrt{3}}{1000} \]

Where:

\( \text{kVA} \) — Apparent power in kilovolt-amperes
\( V \) — Line-to-line voltage (volts)
\( I \) — Current (amps)
\( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the phase relationship in three-phase systems, where power is √3 times higher than in single-phase systems at the same voltage and current.

3. Importance of kVA Calculation

Details: Proper kVA calculation ensures correct sizing of transformers, generators, and circuit protection devices in three-phase systems.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts and the current in amps. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kVA and kW?
A: kVA is apparent power (volts × amps), while kW is real power (volts × amps × power factor). kVA accounts for the total power in the system.

Q2: When should I use this calculation?
A: Use it for sizing three-phase equipment like transformers, generators, and circuit breakers.

Q3: What voltage should I use - line-to-line or line-to-neutral?
A: Always use line-to-line (phase-to-phase) voltage for this calculation.

Q4: How does this differ from single-phase calculation?
A: Single-phase uses V×I/1000, while three-phase includes the √3 factor (≈1.732).

Q5: Can I calculate current if I know kVA and voltage?
A: Yes, rearrange the formula: I = (kVA × 1000)/(V × √3).