1. What is Transformer Full Load Current?

The full load current of a transformer is the current drawn when the transformer is operating at its maximum rated power output. It's a critical parameter for selecting proper protection devices and conductor sizing.

2. How Does the Calculator Work?

The calculator uses the basic electrical power formula:

Where:

• \( I \) — Current in amperes (A)
• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)

Explanation: This simple relationship shows that current is directly proportional to power and inversely proportional to voltage.

3. Importance of Current Calculation

Details: Knowing the full load current is essential for proper transformer selection, circuit protection design, and preventing overheating in electrical systems.

4. Using the Calculator

Tips: Enter the transformer's rated power in watts and the operating voltage in volts. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula valid for both AC and DC transformers?
A: This basic formula works for DC. For AC transformers, you should also consider power factor for more accurate calculations.

Q2: What's the difference between primary and secondary current?
A: Primary current is on the input side (higher voltage), secondary on the output side (lower voltage). The current ratio is inverse to the voltage ratio.

Q3: How does transformer efficiency affect current?
A: Less efficient transformers draw slightly more current to compensate for internal losses.

Q4: What safety margin should I add to calculated current?
A: Typically 25% extra capacity is recommended for safety and future expansion.

Q5: Can I use this for three-phase transformers?
A: For three-phase, you need to include the √3 factor in your calculations (I = P/(V×√3)).