Question

a transformer comes in but the specifications aren't included due to a mistake at the factory. the department head is looking for the rating. if in this single-phase transformer the primary current is 4.55 a and whose primary voltage is 11 kv, what's the rating?

Answer 1

The rating of the single-phase transformer is approximately 0.04995 kVA.

To calculate the rating of a single-phase transformer when the primary current and primary voltage are known, you can use the formula:

Rating (in kVA) = Primary Voltage (in kV) x Primary Current (in A) / 1000

Here's how to calculate the rating step by step:

1. Convert the primary voltage to kV:

- The primary voltage is given as 11 kV.

2. Use the formula to calculate the rating:

- Rating (in kVA) = 11 kV x 4.55 A / 1000

3. Perform the calculation:

- Rating (in kVA) = (11 kV * 4.55 A) / 1000

- Rating (in kVA) = (49.95 kVA) / 1000

4. Calculate the final rating:

- Rating (in kVA) = 0.04995 kVA