1. What is 3 Phase Transformer kVA Calculation?

Definition: This calculator determines the apparent power (kVA) of a three-phase transformer based on voltage and current.

Purpose: It helps electrical engineers and technicians properly size transformers and electrical systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kVA \) — Apparent power (kilovolt-amperes)
• \( V \) — Line voltage (volts)
• \( I \) — Line current (amps)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the phase relationship in three-phase systems by including the √3 factor.

3. Importance of kVA Calculation

Details: Proper kVA calculation ensures transformers are correctly sized to handle the load without overheating or inefficiency.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts and line 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 that does work. They differ by the power factor.

Q2: Why use √3 in the formula?
A: It accounts for the 120° phase difference between the three phases in a balanced system.

Q3: Is this for line-to-line or line-to-neutral voltage?
A: The formula uses line-to-line voltage (phase-to-phase voltage).

Q4: Can I use this for single-phase calculations?
A: No, for single-phase use: kVA = (V × I) / 1000 (without the √3 factor).

Q5: How does this relate to transformer sizing?
A: Transformers are rated in kVA. This calculation helps select a transformer with adequate capacity.