For a typical 1000kVA delta-delta transformer rated 13,800/480V, what is the voltage ratio?

To determine the voltage ratio of a transformer, you need to divide the primary voltage by the secondary voltage. In this case, the primary voltage is 13,800 volts and the secondary voltage is 480 volts.

Calculating the voltage ratio involves taking the primary voltage and dividing it by the secondary voltage:

Voltage Ratio = Primary Voltage / Secondary Voltage = 13,800V / 480V.

Performing this division gives:

Voltage Ratio = 28.75.

This means that the correct answer reflects the relationship between the input voltage (primary side) and output voltage (secondary side) of the transformer. In practical terms, this indicates how many times the primary voltage is greater than the secondary voltage. The value of 28.75 shows that for every unit of voltage on the secondary side, there are 28.75 units of voltage on the primary side, a key concept when working with transformers in electrical systems.