1. What Is Transformer Size Calculation?

Transformer size calculation determines the appropriate kVA rating for a transformer based on the load current and voltage. Proper sizing ensures efficient operation and prevents overload conditions.

2. How Does The Calculator Work?

The calculator uses the transformer size formula:

Where:

• \( I \) — Current in amperes (A)
• \( V \) — Voltage in volts (V)
• 1.732 — Constant for three-phase systems (√3)
• 1000 — Conversion factor to kVA

Explanation: This formula calculates the apparent power in kVA for three-phase systems, which is essential for proper transformer selection.

3. Importance Of Transformer Sizing

Details: Correct transformer sizing is crucial for energy efficiency, voltage regulation, and preventing equipment damage due to overload or underload conditions.

4. Using The Calculator

Tips: Enter current in amperes and voltage in volts. Ensure values are positive and realistic for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: Why is 1.732 used in the formula?
A: 1.732 (√3) is the mathematical constant used in three-phase power calculations to account for the phase relationship between voltages.

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

Q3: Can this formula be used for single-phase systems?
A: For single-phase systems, use kVA = (I × V) / 1000 without the 1.732 multiplier.

Q4: What factors affect transformer sizing?
A: Load type (continuous vs intermittent), ambient temperature, altitude, and future expansion needs should all be considered.

Q5: How much overload capacity do transformers have?
A: Most transformers can handle 10-20% overload for short periods, but continuous operation should not exceed nameplate rating.