1. What is Transformer Amperage?

Transformer amperage refers to the current flowing through the transformer windings. It's a crucial parameter for sizing conductors, protection devices, and ensuring safe operation of electrical systems.

2. How Does the Calculator Work?

The calculator uses the transformer amperage formula:

Where:

• \( I \) — Current in amperes (A)
• \( kVA \) — Apparent power in kilovolt-amperes
• \( V \) — Voltage in volts

Explanation: The formula converts kVA to VA (by multiplying by 1000) then divides by voltage to get current in amperes.

3. Importance of Amperage Calculation

Details: Proper amperage calculation ensures correct sizing of circuit breakers, fuses, and conductors, preventing overheating and potential fire hazards in electrical installations.

4. Using the Calculator

Tips: Enter the transformer's kVA rating and the system voltage. Both values must be positive numbers. The calculator will compute the current in amperes.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation valid for both single-phase and three-phase transformers?
A: This formula works for single-phase transformers. For three-phase transformers, an additional factor of √3 is needed in the denominator.

Q2: What's the difference between kVA and kW?
A: kVA is apparent power (voltage × current), while kW is real power (voltage × current × power factor). Transformers are typically rated in kVA.

Q3: Why multiply by 1000 in the formula?
A: We multiply by 1000 to convert kilovolt-amperes (kVA) to volt-amperes (VA) for consistent units in the calculation.

Q4: How does voltage affect amperage?
A: For a given power (kVA), higher voltage results in lower current, and vice versa. This is why power transmission uses high voltages.

Q5: What safety margin should I add to the calculated amperage?
A: Electrical codes typically require a 125% safety factor for continuous loads (those operating for 3+ hours).