1. What is Transformer kVA?

Transformer kVA (kilovolt-ampere) rating represents the apparent power capacity of a transformer. It's a crucial specification that determines how much electrical load a transformer can handle.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kVA \) — Transformer apparent power (kilovolt-amperes)
• \( P \) — Real power (watts)
• \( PF \) — Power factor (dimensionless, between 0 and 1)

Explanation: The formula converts real power in watts to apparent power in kVA, accounting for the power factor which represents the phase difference between voltage and current.

3. Importance of kVA Calculation

Details: Proper kVA calculation ensures transformers are correctly sized for their loads, preventing overload conditions and ensuring efficient operation of electrical systems.

4. Using the Calculator

Tips: Enter the real power in watts and the power factor (typically between 0.8 and 1 for most applications). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kW and kVA?
A: kW represents real power while kVA represents apparent power. The ratio between them is the power factor (PF = kW/kVA).

Q2: What is a typical power factor value?
A: For most industrial loads, power factor ranges from 0.8 to 0.95. Resistive loads have PF=1, while inductive loads have lower PF.

Q3: Why is kVA rating important for transformers?
A: Transformers are rated in kVA because their capacity is limited by both current and voltage, and kVA accounts for both.

Q4: Can I use this for three-phase transformers?
A: This calculator is for single-phase. For three-phase, you would need to include the √3 factor in the calculation.

Q5: What happens if I exceed the kVA rating?
A: Exceeding the kVA rating can cause overheating, reduced lifespan, and potential failure of the transformer.