1. What is Transformer kVA Calculation?

The transformer kVA calculation determines the apparent power rating of a transformer based on its primary voltage and current. This is essential for proper transformer sizing and selection.

2. How Does the Calculator Work?

The calculator uses the transformer power equation:

Where:

• \( V \) — Primary voltage (volts)
• \( I \) — Primary current (amps)
• 1.732 — √3 (three-phase multiplier)

Explanation: The equation calculates the apparent power in kilovolt-amperes (kVA) which represents the transformer's capacity.

3. Importance of Transformer Sizing

Details: Proper transformer sizing is crucial for efficient power distribution, preventing overload conditions, and ensuring equipment safety.

4. Using the Calculator

Tips: Enter primary voltage (typically 480V for this calculator), primary current in amps, and select the phase. All values must be valid (voltage > 0, current > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why calculate transformer kVA?
A: kVA rating determines the transformer's capacity to handle load without overheating or failing.

Q2: What's the difference between single and three phase?
A: Three-phase systems use a √3 (1.732) multiplier due to the phase relationships in balanced three-phase power.

Q3: How do I select a transformer based on this calculation?
A: Choose a transformer with a standard kVA rating equal to or higher than your calculated value.

Q4: What about efficiency and power factor?
A: This calculates apparent power (kVA). For real power (kW), you'd need to consider power factor.

Q5: Can I use this for step-down transformers?
A: Yes, the calculation works the same for step-up or step-down transformers.