1. What is Transformer kVA Calculation?

Transformer kVA (kilovolt-ampere) calculation determines the apparent power rating of a transformer based on voltage and current measurements. It represents the transformer's capacity to handle electrical load.

2. How Does the Calculator Work?

The calculator uses the single-phase transformer kVA formula:

Where:

• \( V \) — Voltage (volts)
• \( I \) — Current (amps)

Explanation: The formula calculates apparent power by multiplying voltage and current, then dividing by 1000 to convert to kilovolt-amperes.

3. Importance of kVA Calculation

Details: Accurate kVA calculation is essential for proper transformer sizing, electrical system design, load balancing, and ensuring equipment operates within safe capacity limits.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula for single-phase or three-phase transformers?
A: This formula is specifically for single-phase transformers. Three-phase calculations require additional factors.

Q2: What's the difference between kVA and kW?
A: kVA represents apparent power (voltage × current), while kW represents real power (actual work done). The ratio between them is the power factor.

Q3: Why divide by 1000 in the formula?
A: Dividing by 1000 converts the result from volt-amperes (VA) to kilovolt-amperes (kVA), which is the standard unit for transformer ratings.

Q4: Can this calculator be used for DC systems?
A: Yes, the same formula applies to DC systems since apparent power calculation is the same for DC.

Q5: How do I select the right transformer size?
A: Calculate the total kVA requirement of all connected loads and add a safety margin (typically 20-25%) to determine the appropriate transformer size.