1. What is the 3 Phase kVA Formula?

The 3 phase kVA formula calculates the apparent power in a three-phase electrical system. It's essential for sizing transformers, circuit breakers, and other electrical equipment in industrial and commercial applications.

2. How Does the Calculator Work?

The calculator uses the 3 phase kVA formula:

Where:

• \( S \) — Apparent power (kVA)
• \( I \) — Line current (Amps)
• \( V_{LL} \) — Line-to-line voltage (Volts)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)
• 1000 — Conversion factor from VA to kVA

Explanation: The formula accounts for the phase difference in three-phase systems and converts the result to kilovolt-amperes.

3. Importance of kVA Calculation

Details: Accurate kVA calculation is crucial for proper electrical system design, preventing overloads, and ensuring equipment operates within its rated capacity.

4. Using the Calculator

Tips: Enter current in Amps and line-to-line voltage in Volts. All values must be positive numbers.

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 formula?
A: Use it for balanced three-phase AC systems to calculate total apparent power when you know the line current and line-to-line voltage.

Q3: What if I have line-to-neutral voltage?
A: For line-to-neutral voltage (V_LN), use \( S = 3 \times I \times V_{LN} / 1000 \).

Q4: Does this work for DC systems?
A: No, for DC systems use \( S = I \times V / 1000 \) (no √3 factor needed).

Q5: Why divide by 1000?
A: This converts the result from volt-amperes (VA) to kilovolt-amperes (kVA), which is a more practical unit for most electrical systems.