A 1500 KVA three-phase transformer has a secondary voltage of 480/277. What is its secondary full load amperage?

A 1500 KVA three-phase transformer has a secondary voltage of 480/277. What is its secondary full load amperage?

• A. 2.71
• B. 5.42
• C. 10.83
• D. 15.42

Answer: (B)

To calculate the secondary full load amperage of a three-phase transformer, you can use the following formula: \[ I = \frac{P}{\sqrt{3} \times V} \] Where: - \( I \) is the full load amperage, - \( P \) is the power in kilovolt-amperes (KVA), - \( V \) is the voltage in volts. Given that the transformer has a power rating of 1500 KVA and a secondary voltage of 480 volts (line-to-line voltage for a three-phase system), you would substitute these values into the formula. First, calculate the full load amperage using the 480 V: 1. Convert KVA to VA: \[ P = 1500 \times 1000 = 1,500,000 \text{ VA} \] 2. Apply the values in the formula: \[ I = \frac{1,500,000}{\sqrt{3} \times 480} \] 3. Calculate \( \sqrt{3} \) which is approximately 1.732. \[ I = \frac{1,

To calculate the secondary full load amperage of a three-phase transformer, you can use the following formula:

[

I = \frac{P}{\sqrt{3} \times V}

]

Where:

• ( I ) is the full load amperage,

• ( P ) is the power in kilovolt-amperes (KVA),

• ( V ) is the voltage in volts.

Given that the transformer has a power rating of 1500 KVA and a secondary voltage of 480 volts (line-to-line voltage for a three-phase system), you would substitute these values into the formula.

First, calculate the full load amperage using the 480 V:

1. Convert KVA to VA:

[

P = 1500 \times 1000 = 1,500,000 \text{ VA}

]

2. Apply the values in the formula:

[

I = \frac{1,500,000}{\sqrt{3} \times 480}

]

3. Calculate ( \sqrt{3} ) which is approximately 1.732.

[

I = \frac{1,