1. What is Transformer kVA?

kVA (kilovolt-ampere) is the unit of apparent power in an electrical circuit. For transformers, it represents the maximum power the transformer can handle without exceeding its temperature limits.

2. How Does the Calculator Work?

The calculator uses the single-phase transformer formula:

Where:

• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• 1000 — Conversion factor from VA to kVA

Explanation: The formula calculates the apparent power by multiplying voltage and current, then converting to kilovolt-amperes.

3. Importance of kVA Calculation

Details: Proper kVA calculation ensures transformers are correctly sized for their loads, preventing overheating and ensuring efficient operation.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. 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).

Q2: How does this differ for three-phase systems?
A: Three-phase formula is: \( kVA = \frac{V \times I \times \sqrt{3}}{1000} \)

Q3: Why is transformer rating in kVA not kW?
A: Transformers are rated by apparent power because their losses depend on voltage and current, not power factor.

Q4: What happens if load exceeds transformer kVA rating?
A: The transformer may overheat, leading to reduced lifespan or failure.

Q5: How do you account for power factor?
A: For real power (kW), multiply kVA by power factor (typically 0.8-0.95).